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SubjectBUG: stuck on mmap_sem in 3.18.6
From
Python was running under ptrace-based sandbox "sydbox" used exherbo
chroot. Kernel: 3.18.6 + my patch "mm: prevent endless growth of
anon_vma hierarchy" (patch seems stable).

[ 4674.087780] INFO: task python:25873 blocked for more than 120 seconds.
[ 4674.087793] Tainted: G U 3.18.6-zurg+ #158
[ 4674.087797] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 4674.087801] python D ffff88041e2d2000 14176 25873 25630 0x00000102
[ 4674.087817] ffff880286247b68 0000000000000086 ffff8803d5fe6b40
0000000000012000
[ 4674.087824] ffff880286247fd8 0000000000012000 ffff88040c16eb40
ffff8803d5fe6b40
[ 4674.087830] 0000000300000003 ffff8803d5fe6b40 ffff880362888e78
ffff880362888e60
[ 4674.087836] Call Trace:
[ 4674.087854] [<ffffffff81696be9>] schedule+0x29/0x70
[ 4674.087865] [<ffffffff81699815>] rwsem_down_write_failed+0x1d5/0x2f0
[ 4674.087873] [<ffffffff812d4c73>] call_rwsem_down_write_failed+0x13/0x20
[ 4674.087881] [<ffffffff816990c1>] ? down_write+0x31/0x50
[ 4674.087891] [<ffffffff811f3b44>] do_coredump+0x144/0xee0
[ 4674.087900] [<ffffffff810b66f7>] ? pick_next_task_fair+0x397/0x450
[ 4674.087909] [<ffffffff810026a6>] ? __switch_to+0x1d6/0x5f0
[ 4674.087915] [<ffffffff816966e6>] ? __schedule+0x3a6/0x880
[ 4674.087924] [<ffffffff81690000>] ? klist_remove+0x40/0xd0
[ 4674.087932] [<ffffffff81093988>] get_signal+0x298/0x6b0
[ 4674.087940] [<ffffffff81003588>] do_signal+0x28/0xbb0
[ 4674.087946] [<ffffffff8109276d>] ? do_send_sig_info+0x5d/0x80
[ 4674.087955] [<ffffffff81004179>] do_notify_resume+0x69/0xb0
[ 4674.087963] [<ffffffff8169b028>] int_signal+0x12/0x17

Maybe this guy did something wrong?

[ 5153.460186] INFO: task khugepaged:262 blocked for more than 120 seconds.
[ 5153.460198] Tainted: G U 3.18.6-zurg+ #158
[ 5153.460201] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 5153.460206] khugepaged D ffff88041e292000 14496 262 2 0x00000000
[ 5153.460220] ffff88040b99bcb0 0000000000000046 ffff88040b994a40
0000000000012000
[ 5153.460227] ffff88040b99bfd8 0000000000012000 ffff88040c16e300
ffff88040b994a40
[ 5153.460233] ffffffff810d5c1b ffff88040b994a40 ffff880362888e60
ffffffffffffffff
[ 5153.460240] Call Trace:
[ 5153.460255] [<ffffffff810d5c1b>] ? lock_timer_base.isra.41+0x2b/0x50
[ 5153.460264] [<ffffffff81696be9>] schedule+0x29/0x70
[ 5153.460272] [<ffffffff81699a05>] rwsem_down_read_failed+0xd5/0x120
[ 5153.460280] [<ffffffff812d4c44>] call_rwsem_down_read_failed+0x14/0x30
[ 5153.460287] [<ffffffff81699084>] ? down_read+0x24/0x30
[ 5153.460297] [<ffffffff81191221>] khugepaged+0x381/0x13f0
[ 5153.460309] [<ffffffff810bb400>] ? abort_exclusive_wait+0xb0/0xb0
[ 5153.460316] [<ffffffff81190ea0>] ? maybe_pmd_mkwrite+0x30/0x30
[ 5153.460325] [<ffffffff810a217b>] kthread+0xdb/0x100
[ 5153.460332] [<ffffffff810a20a0>] ? kthread_create_on_node+0x170/0x170
[ 5153.460340] [<ffffffff8169acfc>] ret_from_fork+0x7c/0xb0
[ 5153.460347] [<ffffffff810a20a0>] ? kthread_create_on_node+0x170/0x170

and a lot of ps stuck in /proc/*/cmdline (this thing should be killable)

[ 5153.460713] INFO: task ps:26686 blocked for more than 120 seconds.
[ 5153.460716] Tainted: G U 3.18.6-zurg+ #158
[ 5153.460718] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 5153.460721] ps D ffff88041e2d2000 14272 26686 26676 0x00000000
[ 5153.460730] ffff8802a991bc10 0000000000000086 ffff88040bb30000
0000000000012000
[ 5153.460736] ffff8802a991bfd8 0000000000012000 ffff88040c16eb40
ffff88040bb30000
[ 5153.460741] ffff880385d29100 ffff88040bb30000 ffff880362888e60
ffffffffffffffff
[ 5153.460747] Call Trace:
[ 5153.460753] [<ffffffff81696be9>] schedule+0x29/0x70
[ 5153.460760] [<ffffffff81699a05>] rwsem_down_read_failed+0xd5/0x120
[ 5153.460765] [<ffffffff811bb7d1>] ? single_open+0x61/0xb0
[ 5153.460770] [<ffffffff812d4c44>] call_rwsem_down_read_failed+0x14/0x30
[ 5153.460777] [<ffffffff81699084>] ? down_read+0x24/0x30
[ 5153.460784] [<ffffffff8116cae2>] __access_remote_vm+0x42/0x2e0
[ 5153.460791] [<ffffffff811aebea>] ? dput+0x2a/0x1b0
[ 5153.460799] [<ffffffff811724f0>] access_process_vm+0x50/0x70
[ 5153.460806] [<ffffffff8115f8dc>] get_cmdline+0x5c/0x100
[ 5153.460812] [<ffffffff811f877b>] proc_pid_cmdline+0x2b/0x50
[ 5153.460817] [<ffffffff811f8e24>] proc_single_show+0x54/0xa0
[ 5153.460822] [<ffffffff811bb45d>] seq_read+0xcd/0x3b0
[ 5153.460828] [<ffffffff811981d8>] vfs_read+0x98/0x160
[ 5153.460833] [<ffffffff81198ca6>] SyS_read+0x46/0xb0
[ 5153.460841] [<ffffffff8169adad>] system_call_fastpath+0x16/0x1b


[ 5187.935448] SysRq : Show Blocked State
[ 5187.935462] task PC stack pid father
[ 5187.935474] khugepaged D ffff88041e292000 14496 262 2 0x00000000
[ 5187.935489] ffff88040b99bcb0 0000000000000046 ffff88040b994a40
0000000000012000
[ 5187.935496] ffff88040b99bfd8 0000000000012000 ffff88040c16e300
ffff88040b994a40
[ 5187.935502] ffffffff810d5c1b ffff88040b994a40 ffff880362888e60
ffffffffffffffff
[ 5187.935508] Call Trace:
[ 5187.935524] [<ffffffff810d5c1b>] ? lock_timer_base.isra.41+0x2b/0x50
[ 5187.935533] [<ffffffff81696be9>] schedule+0x29/0x70
[ 5187.935541] [<ffffffff81699a05>] rwsem_down_read_failed+0xd5/0x120
[ 5187.935549] [<ffffffff812d4c44>] call_rwsem_down_read_failed+0x14/0x30
[ 5187.935556] [<ffffffff81699084>] ? down_read+0x24/0x30
[ 5187.935566] [<ffffffff81191221>] khugepaged+0x381/0x13f0
[ 5187.935578] [<ffffffff810bb400>] ? abort_exclusive_wait+0xb0/0xb0
[ 5187.935585] [<ffffffff81190ea0>] ? maybe_pmd_mkwrite+0x30/0x30
[ 5187.935593] [<ffffffff810a217b>] kthread+0xdb/0x100
[ 5187.935601] [<ffffffff810a20a0>] ? kthread_create_on_node+0x170/0x170
[ 5187.935609] [<ffffffff8169acfc>] ret_from_fork+0x7c/0xb0
[ 5187.935615] [<ffffffff810a20a0>] ? kthread_create_on_node+0x170/0x170
[ 5187.935688] python D ffff88041e2d2000 14176 25873 25630 0x00000102
[ 5187.935699] ffff880286247b68 0000000000000086 ffff8803d5fe6b40
0000000000012000
[ 5187.935705] ffff880286247fd8 0000000000012000 ffff88040c16eb40
ffff8803d5fe6b40
[ 5187.935711] 0000000300000003 ffff8803d5fe6b40 ffff880362888e78
ffff880362888e60
[ 5187.935717] Call Trace:
[ 5187.935724] [<ffffffff81696be9>] schedule+0x29/0x70
[ 5187.935731] [<ffffffff81699815>] rwsem_down_write_failed+0x1d5/0x2f0
[ 5187.935737] [<ffffffff812d4c73>] call_rwsem_down_write_failed+0x13/0x20
[ 5187.935744] [<ffffffff816990c1>] ? down_write+0x31/0x50
[ 5187.935754] [<ffffffff811f3b44>] do_coredump+0x144/0xee0
[ 5187.935761] [<ffffffff810b66f7>] ? pick_next_task_fair+0x397/0x450
[ 5187.935770] [<ffffffff810026a6>] ? __switch_to+0x1d6/0x5f0
[ 5187.935777] [<ffffffff816966e6>] ? __schedule+0x3a6/0x880
[ 5187.935786] [<ffffffff81690000>] ? klist_remove+0x40/0xd0
[ 5187.935794] [<ffffffff81093988>] get_signal+0x298/0x6b0
[ 5187.935802] [<ffffffff81003588>] do_signal+0x28/0xbb0
[ 5187.935807] [<ffffffff8109276d>] ? do_send_sig_info+0x5d/0x80
[ 5187.935816] [<ffffffff81004179>] do_notify_resume+0x69/0xb0
[ 5187.935824] [<ffffffff8169b028>] int_signal+0x12/0x17
[ 5187.935834] ps D ffff88041e212000 14272 26669 3799 0x00000000
[ 5187.935844] ffff8802a98bbc10 0000000000000082 ffff8803e138ca40
0000000000012000
[ 5187.935850] ffff8802a98bbfd8 0000000000012000 ffffffff81c18500
ffff8803e138ca40
[ 5187.935855] ffff8800c9bb5400 ffff8803e138ca40 ffff880362888e60
ffffffffffffffff
[ 5187.935861] Call Trace:
[ 5187.935868] [<ffffffff81696be9>] schedule+0x29/0x70
[ 5187.935874] [<ffffffff81699a05>] rwsem_down_read_failed+0xd5/0x120
[ 5187.935881] [<ffffffff811bb7d1>] ? single_open+0x61/0xb0
[ 5187.935887] [<ffffffff812d4c44>] call_rwsem_down_read_failed+0x14/0x30
[ 5187.935894] [<ffffffff81699084>] ? down_read+0x24/0x30
[ 5187.935903] [<ffffffff8116cae2>] __access_remote_vm+0x42/0x2e0
[ 5187.935912] [<ffffffff811aebea>] ? dput+0x2a/0x1b0
[ 5187.935920] [<ffffffff811724f0>] access_process_vm+0x50/0x70
[ 5187.935929] [<ffffffff8115f8dc>] get_cmdline+0x5c/0x100
[ 5187.935935] [<ffffffff811f877b>] proc_pid_cmdline+0x2b/0x50
[ 5187.935941] [<ffffffff811f8e24>] proc_single_show+0x54/0xa0
[ 5187.935947] [<ffffffff811bb45d>] seq_read+0xcd/0x3b0
[ 5187.935953] [<ffffffff811981d8>] vfs_read+0x98/0x160
[ 5187.935959] [<ffffffff81198ca6>] SyS_read+0x46/0xb0
[ 5187.935966] [<ffffffff8169adad>] system_call_fastpath+0x16/0x1b
[ 5187.935999] ps D ffff88041e2d2000 14272 26686 26676 0x00000000
[ 5187.936010] ffff8802a991bc10 0000000000000086 ffff88040bb30000
0000000000012000
[ 5187.936015] ffff8802a991bfd8 0000000000012000 ffff88040c16eb40
ffff88040bb30000
[ 5187.936021] ffff880385d29100 ffff88040bb30000 ffff880362888e60
ffffffffffffffff
[ 5187.936026] Call Trace:
[ 5187.936033] [<ffffffff81696be9>] schedule+0x29/0x70
[ 5187.936040] [<ffffffff81699a05>] rwsem_down_read_failed+0xd5/0x120
[ 5187.936046] [<ffffffff811bb7d1>] ? single_open+0x61/0xb0
[ 5187.936052] [<ffffffff812d4c44>] call_rwsem_down_read_failed+0x14/0x30
[ 5187.936079] [<ffffffff81699084>] ? down_read+0x24/0x30
[ 5187.936099] [<ffffffff8116cae2>] __access_remote_vm+0x42/0x2e0
[ 5187.936106] [<ffffffff811aebea>] ? dput+0x2a/0x1b0
[ 5187.936114] [<ffffffff811724f0>] access_process_vm+0x50/0x70
[ 5187.936121] [<ffffffff8115f8dc>] get_cmdline+0x5c/0x100
[ 5187.936127] [<ffffffff811f877b>] proc_pid_cmdline+0x2b/0x50
[ 5187.936132] [<ffffffff811f8e24>] proc_single_show+0x54/0xa0
[ 5187.936138] [<ffffffff811bb45d>] seq_read+0xcd/0x3b0
[ 5187.936143] [<ffffffff811981d8>] vfs_read+0x98/0x160
[ 5187.936149] [<ffffffff81198ca6>] SyS_read+0x46/0xb0
[ 5187.936156] [<ffffffff8169adad>] system_call_fastpath+0x16/0x1b
[ 5187.936160] ps D ffff88041e292000 14288 26726 26704 0x00000004
[ 5187.936170] ffff8802a98abc10 0000000000000086 ffff8800d5f5f380
0000000000012000
[ 5187.936175] ffff8802a98abfd8 0000000000012000 ffff88040c16e300
ffff8800d5f5f380
[ 5187.936181] ffff8803d5c3f400 ffff8800d5f5f380 ffff880362888e60
ffffffffffffffff
[ 5187.936186] Call Trace:
[ 5187.936192] [<ffffffff81696be9>] schedule+0x29/0x70
[ 5187.936199] [<ffffffff81699a05>] rwsem_down_read_failed+0xd5/0x120
[ 5187.936204] [<ffffffff811bb7d1>] ? single_open+0x61/0xb0
[ 5187.936209] [<ffffffff812d4c44>] call_rwsem_down_read_failed+0x14/0x30
[ 5187.936216] [<ffffffff81699084>] ? down_read+0x24/0x30
[ 5187.936223] [<ffffffff8116cae2>] __access_remote_vm+0x42/0x2e0
[ 5187.936230] [<ffffffff811aebea>] ? dput+0x2a/0x1b0
[ 5187.936238] [<ffffffff811724f0>] access_process_vm+0x50/0x70
[ 5187.936245] [<ffffffff8115f8dc>] get_cmdline+0x5c/0x100
[ 5187.936250] [<ffffffff811f877b>] proc_pid_cmdline+0x2b/0x50
[ 5187.936256] [<ffffffff811f8e24>] proc_single_show+0x54/0xa0
[ 5187.936261] [<ffffffff811bb45d>] seq_read+0xcd/0x3b0
[ 5187.936266] [<ffffffff811981d8>] vfs_read+0x98/0x160
[ 5187.936272] [<ffffffff81198ca6>] SyS_read+0x46/0xb0
[ 5187.936279] [<ffffffff8169adad>] system_call_fastpath+0x16/0x1b
[ 5187.936284] ps D ffff88041e252000 14280 26765 26752 0x00000004
[ 5187.936293] ffff8800c9a6fc10 0000000000000086 ffff8803708edac0
0000000000012000
[ 5187.936298] ffff8800c9a6ffd8 0000000000012000 ffff88040c16dac0
ffff8803708edac0
[ 5187.936303] ffff8803e7bd1800 ffff8803708edac0 ffff880362888e60
ffffffffffffffff
[ 5187.936309] Call Trace:
[ 5187.936315] [<ffffffff81696be9>] schedule+0x29/0x70
[ 5187.936321] [<ffffffff81699a05>] rwsem_down_read_failed+0xd5/0x120
[ 5187.936326] [<ffffffff811bb7d1>] ? single_open+0x61/0xb0
[ 5187.936332] [<ffffffff812d4c44>] call_rwsem_down_read_failed+0x14/0x30
[ 5187.936338] [<ffffffff81699084>] ? down_read+0x24/0x30
[ 5187.936345] [<ffffffff8116cae2>] __access_remote_vm+0x42/0x2e0
[ 5187.936352] [<ffffffff811aebea>] ? dput+0x2a/0x1b0
[ 5187.936360] [<ffffffff811724f0>] access_process_vm+0x50/0x70
[ 5187.936367] [<ffffffff8115f8dc>] get_cmdline+0x5c/0x100
[ 5187.936372] [<ffffffff811f877b>] proc_pid_cmdline+0x2b/0x50
[ 5187.936378] [<ffffffff811f8e24>] proc_single_show+0x54/0xa0
[ 5187.936383] [<ffffffff811bb45d>] seq_read+0xcd/0x3b0
[ 5187.936388] [<ffffffff811981d8>] vfs_read+0x98/0x160
[ 5187.936394] [<ffffffff81198ca6>] SyS_read+0x46/0xb0
[ 5187.936401] [<ffffffff8169adad>] system_call_fastpath+0x16/0x1b
[ 5187.936405] ps D ffff88041e292000 14280 26782 26772 0x00000000
[ 5187.936414] ffff8800b26f3c10 0000000000000082 ffff8803708e9080
0000000000012000
[ 5187.936420] ffff8800b26f3fd8 0000000000012000 ffff88040c16e300
ffff8803708e9080
[ 5187.936425] ffff8803d5c3ee00 ffff8803708e9080 ffff880362888e60
ffffffffffffffff
[ 5187.936430] Call Trace:
[ 5187.936437] [<ffffffff81696be9>] schedule+0x29/0x70
[ 5187.936443] [<ffffffff81699a05>] rwsem_down_read_failed+0xd5/0x120
[ 5187.936448] [<ffffffff811bb7d1>] ? single_open+0x61/0xb0
[ 5187.936454] [<ffffffff812d4c44>] call_rwsem_down_read_failed+0x14/0x30
[ 5187.936460] [<ffffffff81699084>] ? down_read+0x24/0x30
[ 5187.936467] [<ffffffff8116cae2>] __access_remote_vm+0x42/0x2e0
[ 5187.936474] [<ffffffff811aebea>] ? dput+0x2a/0x1b0
[ 5187.936482] [<ffffffff811724f0>] access_process_vm+0x50/0x70
[ 5187.936489] [<ffffffff8115f8dc>] get_cmdline+0x5c/0x100
[ 5187.936494] [<ffffffff811f877b>] proc_pid_cmdline+0x2b/0x50
[ 5187.936500] [<ffffffff811f8e24>] proc_single_show+0x54/0xa0
[ 5187.936505] [<ffffffff811bb45d>] seq_read+0xcd/0x3b0
[ 5187.936510] [<ffffffff811981d8>] vfs_read+0x98/0x160
[ 5187.936516] [<ffffffff81198ca6>] SyS_read+0x46/0xb0
[ 5187.936523] [<ffffffff8169adad>] system_call_fastpath+0x16/0x1b
[ 5187.936527] ps D ffff88041e2d2000 14280 26795 26783 0x00000000
[ 5187.936536] ffff8802a9b8fc10 0000000000000086 ffff8803e13c6300
0000000000012000
[ 5187.936541] ffff8802a9b8ffd8 0000000000012000 ffff88040c16eb40
ffff8803e13c6300
[ 5187.936547] ffff8803e7bd1b00 ffff8803e13c6300 ffff880362888e60
ffffffffffffffff
[ 5187.936552] Call Trace:
[ 5187.936558] [<ffffffff81696be9>] schedule+0x29/0x70
[ 5187.936565] [<ffffffff81699a05>] rwsem_down_read_failed+0xd5/0x120
[ 5187.936570] [<ffffffff811bb7d1>] ? single_open+0x61/0xb0
[ 5187.936575] [<ffffffff812d4c44>] call_rwsem_down_read_failed+0x14/0x30
[ 5187.936582] [<ffffffff81699084>] ? down_read+0x24/0x30
[ 5187.936588] [<ffffffff8116cae2>] __access_remote_vm+0x42/0x2e0
[ 5187.936596] [<ffffffff811aebea>] ? dput+0x2a/0x1b0
[ 5187.936603] [<ffffffff811724f0>] access_process_vm+0x50/0x70
[ 5187.936610] [<ffffffff8115f8dc>] get_cmdline+0x5c/0x100
[ 5187.936616] [<ffffffff811f877b>] proc_pid_cmdline+0x2b/0x50
[ 5187.936621] [<ffffffff811f8e24>] proc_single_show+0x54/0xa0
[ 5187.936626] [<ffffffff811bb45d>] seq_read+0xcd/0x3b0
[ 5187.936632] [<ffffffff811981d8>] vfs_read+0x98/0x160
[ 5187.936637] [<ffffffff81198ca6>] SyS_read+0x46/0xb0
[ 5187.936644] [<ffffffff8169adad>] system_call_fastpath+0x16/0x1b
[ 5187.936648] pidof D ffff88041e212000 14288 26808 26798 0x00000004
[ 5187.936658] ffff8802a9b67c10 0000000000000082 ffff8800d5f58000
0000000000012000
[ 5187.936663] ffff8802a9b67fd8 0000000000012000 ffffffff81c18500
ffff8800d5f58000
[ 5187.936669] ffff880000320700 ffff8800d5f58000 ffff880362888e60
ffffffffffffffff
[ 5187.936674] Call Trace:
[ 5187.936680] [<ffffffff81696be9>] schedule+0x29/0x70
[ 5187.936687] [<ffffffff81699a05>] rwsem_down_read_failed+0xd5/0x120
[ 5187.936692] [<ffffffff811bb7d1>] ? single_open+0x61/0xb0
[ 5187.936697] [<ffffffff812d4c44>] call_rwsem_down_read_failed+0x14/0x30
[ 5187.936704] [<ffffffff81699084>] ? down_read+0x24/0x30
[ 5187.936710] [<ffffffff8116cae2>] __access_remote_vm+0x42/0x2e0
[ 5187.936718] [<ffffffff811724f0>] access_process_vm+0x50/0x70
[ 5187.936725] [<ffffffff8115f8dc>] get_cmdline+0x5c/0x100
[ 5187.936731] [<ffffffff811f877b>] proc_pid_cmdline+0x2b/0x50
[ 5187.936751] [<ffffffff811f8e24>] proc_single_show+0x54/0xa0
[ 5187.936771] [<ffffffff811bb45d>] seq_read+0xcd/0x3b0
[ 5187.936776] [<ffffffff811981d8>] vfs_read+0x98/0x160
[ 5187.936782] [<ffffffff81198ca6>] SyS_read+0x46/0xb0
[ 5187.936789] [<ffffffff8169adad>] system_call_fastpath+0x16/0x1b

Looks like mmap_sem is locked for read:

mmap_sem = {
count = 0xffffffff00000001,
wait_list = {
next = 0xffff880286247ba8,
prev = 0xffff8802a9a3fc40
},
wait_lock = {
raw_lock = {
{
head_tail = 0xa0a,
tickets = {
head = 0xa,
tail = 0xa
}
}
}
},
osq = {
tail = {
counter = 0x0
}
},
owner = 0x0
},




crash> vm -m 25873
PID: 25873 TASK: ffff8803d5fe6b40 CPU: 3 COMMAND: "python"
struct mm_struct {
mmap = 0xffff88034789d630,
mm_rb = {
rb_node = 0xffff88034789de90
},
vmacache_seqnum = 16,
get_unmapped_area = 0xffffffff81009cb0 <arch_get_unmapped_area_topdown>,
mmap_base = 140658574835712,
mmap_legacy_base = 47602925838336,
task_size = 140737488351232,
highest_vm_end = 140735317192704,
pgd = 0xffff880385fa8000,
mm_users = {
counter = 17
},
mm_count = {
counter = 2
},
nr_ptes = {
counter = 19
},
map_count = 38,
page_table_lock = {
{
rlock = {
raw_lock = {
{
head_tail = 63479,
tickets = {
head = 247 '\367',
tail = 247 '\367'
}
}
}
}
}
},
mmap_sem = {
count = -4294967295,
wait_list = {
next = 0xffff880286247ba8,
prev = 0xffff8802a9a3fc40
},
wait_lock = {
raw_lock = {
{
head_tail = 2570,
tickets = {
head = 10 '\n',
tail = 10 '\n'
}
}
}
},
osq = {
tail = {
counter = 0
}
},
owner = 0x0
},
mmlist = {
next = 0xffff880362888e88,
prev = 0xffff880362888e88
},
hiwater_rss = 1568,
hiwater_vm = 5064,
total_vm = 7182,
locked_vm = 0,
pinned_vm = 0,
shared_vm = 4432,
exec_vm = 1248,
stack_vm = 2049,
def_flags = 0,
start_code = 4194304,
end_code = 4197980,
start_data = 6295552,
end_data = 6296256,
start_brk = 25419776,
brk = 26329088,
start_stack = 140735316677648,
arg_start = 140735316687680,
arg_end = 140735316687834,
env_start = 140735316687834,
env_end = 140735316705197,
saved_auxv = {33, 140735317184512, 16, 3219913727, 6, 4096, 17, 100,
3, 4194368, 4, 56, 5, 8, 7, 140658572595200, 8, 0, 9, 4197157, 11,
103, 12, 103, 13, 443, 14, 443, 23, 0, 25, 140735316680617, 31,
140735316705197, 15, 140735316680633, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
rss_stat = {
count = {{
counter = 942
}, {
counter = 2779
}, {
counter = 0
}}
},
binfmt = 0xffffffff81c699e0 <elf_format>,
cpu_vm_mask_var = {{
bits = {0}
}},
context = {
ldt = 0x0,
size = 0,
ia32_compat = 0,
lock = {
count = {
counter = 1
},
wait_lock = {
{
rlock = {
raw_lock = {
{
head_tail = 0,
tickets = {
head = 0 '\000',
tail = 0 '\000'
}
}
}
}
}
},
wait_list = {
next = 0xffff8803628890e8,
prev = 0xffff8803628890e8
},
owner = 0x0,
osq = {
tail = {
counter = 0
}
}
},
vdso = 0x7fff7e969000
},
flags = 131277,
core_state = 0x0,
ioctx_lock = {
{
rlock = {
raw_lock = {
{
head_tail = 0,
tickets = {
head = 0 '\000',
tail = 0 '\000'
}
}
}
}
}
},
ioctx_table = 0x0,
exe_file = 0xffff8800c9802100,
mmu_notifier_mm = 0x0,
tlb_flush_pending = false,
uprobes_state = {
xol_area = 0x0
}
}
crash> task 25873
PID: 25873 TASK: ffff8803d5fe6b40 CPU: 3 COMMAND: "python"
struct task_struct {
state = 2,
stack = 0xffff880286244000,
usage = {
counter = 10
},
flags = 4219904,
ptrace = 0,
wake_entry = {
next = 0x0
},
on_cpu = 0,
last_wakee = 0xffff8803e138c200,
wakee_flips = 73,
wakee_flip_decay_ts = 4299225608,
wake_cpu = 3,
on_rq = 0,
prio = 120,
static_prio = 120,
normal_prio = 120,
rt_priority = 0,
sched_class = 0xffffffff81815900 <print_fmt_sched_switch+256>,
se = {
load = {
weight = 1024,
inv_weight = 4194304
},
run_node = {
__rb_parent_color = 1,
rb_right = 0x0,
rb_left = 0x0
},
group_node = {
next = 0xffff8803d5fe6bd0,
prev = 0xffff8803d5fe6bd0
},
on_rq = 0,
exec_start = 4553221849241,
sum_exec_runtime = 32524243,
vruntime = 3182965965951,
prev_sum_exec_runtime = 32521714,
nr_migrations = 2,
statistics = {
wait_start = 0,
wait_max = 544641,
wait_count = 283,
wait_sum = 2603230,
iowait_count = 0,
iowait_sum = 0,
sleep_start = 0,
sleep_max = 0,
sum_sleep_runtime = 0,
block_start = 4553221849241,
block_max = 0,
exec_max = 1000187,
slice_max = 0,
nr_migrations_cold = 0,
nr_failed_migrations_affine = 0,
nr_failed_migrations_running = 0,
nr_failed_migrations_hot = 0,
nr_forced_migrations = 0,
nr_wakeups = 230,
nr_wakeups_sync = 0,
nr_wakeups_migrate = 0,
nr_wakeups_local = 229,
nr_wakeups_remote = 1,
nr_wakeups_affine = 0,
nr_wakeups_affine_attempts = 1,
nr_wakeups_passive = 0,
nr_wakeups_idle = 0
},
avg = {
runnable_avg_sum = 21668,
runnable_avg_period = 22496,
last_runnable_update = 4553221849241,
decay_count = 4342291,
load_avg_contrib = 985
}
},
rt = {
run_list = {
next = 0xffff8803d5fe6d08,
prev = 0xffff8803d5fe6d08
},
timeout = 0,
watchdog_stamp = 0,
time_slice = 100,
back = 0x0
},
dl = {
rb_node = {
__rb_parent_color = 18446612148789341496,
rb_right = 0x0,
rb_left = 0x0
},
dl_runtime = 0,
dl_deadline = 0,
dl_period = 0,
dl_bw = 0,
runtime = 0,
deadline = 0,
flags = 0,
dl_throttled = 0,
dl_new = 0,
dl_boosted = 0,
dl_yielded = 0,
dl_timer = {
node = {
node = {
__rb_parent_color = 18446612148789341592,
rb_right = 0x0,
rb_left = 0x0
},
expires = {
tv64 = 0
}
},
_softexpires = {
tv64 = 0
},
function = 0x0,
base = 0xffff88041e2cc8c0,
state = 0
}
},
preempt_notifiers = {
first = 0x0
},
btrace_seq = 0,
policy = 0,
nr_cpus_allowed = 8,
cpus_allowed = {
bits = {255}
},
sched_info = {
pcount = 281,
run_delay = 2603230,
last_arrival = 4553221846712,
last_queued = 0
},
tasks = {
next = 0xffff8803d5fe3458,
prev = 0xffff8803b1fe82d8
},
pushable_tasks = {
prio = 140,
prio_list = {
next = 0xffff8803d5fe6e30,
prev = 0xffff8803d5fe6e30
},
node_list = {
next = 0xffff8803d5fe6e40,
prev = 0xffff8803d5fe6e40
}
},
pushable_dl_tasks = {
__rb_parent_color = 18446612148789341776,
rb_right = 0x0,
rb_left = 0x0
},
mm = 0xffff880362888e00,
active_mm = 0xffff880362888e00,
vmacache_seqnum = 16,
vmacache = {0xffff88034789dc60, 0xffff880347b2e6e0, 0x0, 0xffff88034798c8f0},
rss_stat = {
events = 10,
count = {0, 10, 0}
},
exit_state = 0,
exit_code = 0,
exit_signal = 17,
pdeath_signal = 0,
jobctl = 65536,
personality = 0,
in_execve = 0,
in_iowait = 0,
sched_reset_on_fork = 0,
sched_contributes_to_load = 0,
atomic_flags = 1,
pid = 25873,
tgid = 25873,
real_parent = 0xffff8803b1fe8000,
parent = 0xffff8803b1fe8000,
children = {
next = 0xffff8803d5fe6ef0,
prev = 0xffff8803d5fe6ef0
},
sibling = {
next = 0xffff8803b1fe83b0,
prev = 0xffff8803b1fe83b0
},
group_leader = 0xffff8803d5fe6b40,
ptraced = {
next = 0xffff8803d5fe6f18,
prev = 0xffff8803d5fe6f18
},
ptrace_entry = {
next = 0xffff8803d5fe6f28,
prev = 0xffff8803d5fe6f28
},
pids = {{
node = {
next = 0x0,
pprev = 0xffff8803478a5b88
},
pid = 0xffff8803478a5b80
}, {
node = {
next = 0xffff8803b1fe8410,
pprev = 0xffff8803ee4afd90
},
pid = 0xffff8803ee4afd80
}, {
node = {
next = 0xffff8803b1fe8428,
pprev = 0xffff8803e7b85598
},
pid = 0xffff8803e7b85580
}},
thread_group = {
next = 0xffff8803d5fe6f80,
prev = 0xffff8803d5fe6f80
},
thread_node = {
next = 0xffff880362888710,
prev = 0xffff880362888710
},
vfork_done = 0x0,
set_child_tid = 0x7f53d42569d0,
clear_child_tid = 0x7feda06279d0,
utime = 25000000,
stime = 8000000,
utimescaled = 25000000,
stimescaled = 8000000,
gtime = 0,
prev_cputime = {
utime = 0,
stime = 0
},
vtime_seqlock = {
seqcount = {
sequence = 0
},
lock = {
{
rlock = {
raw_lock = {
{
head_tail = 0,
tickets = {
head = 0 '\000',
tail = 0 '\000'
}
}
}
}
}
}
},
vtime_snap = 0,
vtime_snap_whence = VTIME_SLEEPING,
nvcsw = 231,
nivcsw = 50,
start_time = 4559100753964,
real_start_time = 4559100754077,
min_flt = 2896,
maj_flt = 0,
cputime_expires = {
utime = 0,
stime = 0,
sum_exec_runtime = 0
},
cpu_timers = {{
next = 0xffff8803d5fe7050,
prev = 0xffff8803d5fe7050
}, {
next = 0xffff8803d5fe7060,
prev = 0xffff8803d5fe7060
}, {
next = 0xffff8803d5fe7070,
prev = 0xffff8803d5fe7070
}},
real_cred = 0xffff88040afb06c0,
cred = 0xffff88040afb06c0,
comm = "python\000bash\000al\000",
link_count = 0,
total_link_count = 0,
sysvsem = {
undo_list = 0x0
},
sysvshm = {
shm_clist = {
next = 0xffff8803d5fe70b0,
prev = 0xffff8803d5fe70b0
}
},
last_switch_count = 281,
thread = {
tls_array = {{
{
{
a = 0,
b = 0
},
{
limit0 = 0,
base0 = 0,
base1 = 0,
type = 0,
s = 0,
dpl = 0,
p = 0,
limit = 0,
avl = 0,
l = 0,
d = 0,
g = 0,
base2 = 0
}
}
}, {
{
{
a = 0,
b = 0
},
{
limit0 = 0,
base0 = 0,
base1 = 0,
type = 0,
s = 0,
dpl = 0,
p = 0,
limit = 0,
avl = 0,
l = 0,
d = 0,
g = 0,
base2 = 0
}
}
}, {
{
{
a = 0,
b = 0
},
{
limit0 = 0,
base0 = 0,
base1 = 0,
type = 0,
s = 0,
dpl = 0,
p = 0,
limit = 0,
avl = 0,
l = 0,
d = 0,
g = 0,
base2 = 0
}
}
}},
sp0 = 18446612143154692096,
sp = 18446612143154690808,
usersp = 25633912,
es = 0,
ds = 0,
fsindex = 0,
gsindex = 0,
fs = 140658574784256,
gs = 0,
ptrace_bps = {0x0, 0x0, 0x0, 0x0},
debugreg6 = 0,
ptrace_dr7 = 0,
cr2 = 140735308316664,
trap_nr = 14,
error_code = 6,
fpu = {
last_cpu = 3,
has_fpu = 0,
state = 0xffff8802862ba3c0
},
io_bitmap_ptr = 0x0,
iopl = 0,
io_bitmap_max = 0,
fpu_counter = 25 '\031'
},
fs = 0xffff8803b1d8a280,
files = 0xffff880385e50000,
nsproxy = 0xffffffff81c3ab60 <init_nsproxy>,
signal = 0xffff880362888700,
sighand = 0xffff8803708a5280,
blocked = {
sig = {0}
},
real_blocked = {
sig = {0}
},
saved_sigmask = {
sig = {65536}
},
pending = {
list = {
next = 0xffff8803d5fe71c0,
prev = 0xffff8803d5fe71c0
},
signal = {
sig = {0}
}
},
sas_ss_sp = 25627024,
sas_ss_size = 8192,
notifier = 0x0,
notifier_data = 0x0,
notifier_mask = 0x0,
task_works = 0x0,
audit_context = 0x0,
seccomp = {
mode = 2,
filter = 0xffff880347846a40
},
parent_exec_id = 39,
self_exec_id = 40,
alloc_lock = {
{
rlock = {
raw_lock = {
{
head_tail = 65535,
tickets = {
head = 255 '\377',
tail = 255 '\377'
}
}
}
}
}
},
pi_lock = {
raw_lock = {
{
head_tail = 45746,
tickets = {
head = 178 '\262',
tail = 178 '\262'
}
}
}
},
pi_waiters = {
rb_node = 0x0
},
pi_waiters_leftmost = 0x0,
pi_blocked_on = 0x0,
journal_info = 0x0,
bio_list = 0x0,
plug = 0x0,
reclaim_state = 0x0,
backing_dev_info = 0x0,
io_context = 0x0,
ptrace_message = 4,
last_siginfo = 0x0,
ioac = {<No data fields>},
robust_list = 0x7feda06279e0,
compat_robust_list = 0x0,
pi_state_list = {
next = 0xffff8803d5fe7298,
prev = 0xffff8803d5fe7298
},
pi_state_cache = 0x0,
perf_event_ctxp = {0x0, 0x0},
perf_event_mutex = {
count = {
counter = 1
},
wait_lock = {
{
rlock = {
raw_lock = {
{
head_tail = 0,
tickets = {
head = 0 '\000',
tail = 0 '\000'
}
}
}
}
}
},
wait_list = {
next = 0xffff8803d5fe72c8,
prev = 0xffff8803d5fe72c8
},
owner = 0x0,
osq = {
tail = {
counter = 0
}
}
},
perf_event_list = {
next = 0xffff8803d5fe72e8,
prev = 0xffff8803d5fe72e8
},
rcu = {
next = 0x0,
func = 0x0
},
splice_pipe = 0x0,
task_frag = {
page = 0x0,
offset = 0,
size = 0
},
delays = 0xffff8803b1d8ae80,
nr_dirtied = 0,
nr_dirtied_pause = 32,
dirty_paused_when = 0,
timer_slack_ns = 50000,
default_timer_slack_ns = 50000,
curr_ret_stack = -1,
ret_stack = 0x0,
ftrace_timestamp = 0,
trace_overrun = {
counter = 0
},
tracing_graph_pause = {
counter = 0
},
trace = 0,
trace_recursion = 0,
utask = 0x0
}

struct thread_info {
task = 0xffff8803d5fe6b40,
exec_domain = 0xffffffff81c2e6c0 <default_exec_domain>,
flags = 258,
status = 0,
cpu = 3,
saved_preempt_count = -2147483648,
addr_limit = {
seg = 140737488351232
},
restart_block = {
fn = 0xffffffff81093ec0 <do_no_restart_syscall>,
{
futex = {
uaddr = 0x0,
val = 0,
flags = 0,
bitset = 0,
time = 0,
uaddr2 = 0x0
},
nanosleep = {
clockid = 0,
rmtp = 0x0,
compat_rmtp = 0x0,
expires = 0
},
poll = {
ufds = 0x0,
nfds = 0,
has_timeout = 0,
tv_sec = 0,
tv_nsec = 0
}
}
},
sysenter_return = 0x0,
sig_on_uaccess_error = 0,
uaccess_err = 0
}


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