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SubjectRe: 2.6.25-rc3-mm1 - BUG at system shutdown time
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On Thu, 06 Mar 2008 22:16:02 PST, Andrew Morton said:

> > [ 74.254402] CPU 1 is now offline
> > [ 74.255395] SMP alternatives: switching to UP code
> > [ 74.256373] BUG: unable to handle kernel paging request at ffffffff8020a023
> > [ 74.256373] IP: [<ffffffff80211872>] alternatives_smp_unlock+0x66/0x7b
> > [ 74.256373] PGD 203067 PUD 207063 PMD 7e4cc163 PTE 20a161
> > [ 74.256373] Oops: 0003 [1] PREEMPT SMP
> > [ 74.256373] last sysfs file: /sys/devices/virtual/block/dm-14/dev
> > [ 74.256373] CPU 0
> > [ 74.256373] Modules linked in: rtc sha256_generic aes_generic acpi_cpufreq tpm_tis arc4 ecb pcmcia iwl3945 iTCO_wdt ohci1394 firmware_class iTCO_vendor_support yenta_socket watchdog_core thermal rsrc_nonstatic mac80211 snd_hda_intel intel_agp watchdog_dev ieee1394 pcmcia_core processor button ac battery cfg80211
> > [ 74.256373] Pid: 1767, comm: halt Not tainted 2.6.25-rc3-mm1 #8
> > [ 74.256373] RIP: 0010:[<ffffffff80211872>] [<ffffffff80211872>] alternatives_smp_unlock+0x66/0x7b
> > [ 74.256373] RSP: 0018:ffff81007ac63d10 EFLAGS: 00010093
> > [ 74.256373] RAX: ffffffff80573190 RBX: ffff81007f83a8c0 RCX: ffffffff80563cec
> > [ 74.256373] RDX: ffffffff8020a023 RSI: ffffffff8078a0b8 RDI: ffffffff80783018
> > [ 74.256373] RBP: ffff81007ac63d28 R08: 0000000000000001 R09: ffffffff80563cec
> > [ 74.256373] R10: ffffffff80200000 R11: ffff81007ac63d1f R12: 0000000000000000
> > [ 74.256373] R13: 0000000000000001 R14: 0000000000000246 R15: ffff81007d156340
> > [ 74.256373] FS: 00007f2d0ab206f0(0000) GS:ffffffff8076e000(0000) knlGS:0000000000000000
> > [ 74.256373] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> > [ 74.256373] CR2: ffffffff8020a023 CR3: 000000007edf3000 CR4: 00000000000006e0
> > [ 74.256373] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > [ 74.256373] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> > [ 74.256373] Process halt (pid: 1767, threadinfo ffff81007ac62000, task ffff81007db96300)
> > [ 74.256373] Stack: ffffffff8080df80 90ffffff8055ba3b ffff81007f83a8c0 ffff81007ac63d68
> > [ 74.256374] ffffffff80211a01 ffffffff807c6584 0000000000000001 ffffffff807c6584
> > [ 74.256374] 0000000000000001 0000000000000001 0000000000000001 ffff81007ac63d98
> > [ 74.256374] Call Trace:
> > [ 74.256374] [<ffffffff80211a01>] alternatives_smp_switch+0x17a/0x1b6
> > [ 74.256374] [<ffffffff80219dd3>] __cpu_die+0x58/0x87
> > [ 74.256374] [<ffffffff805498b2>] _cpu_down+0x1a4/0x28c
> > [ 74.256374] [<ffffffff80252e90>] disable_nonboot_cpus+0x60/0x108
> > [ 74.256374] [<ffffffff80241619>] kernel_power_off+0x21/0x3b
> > [ 74.256374] [<ffffffff80241863>] sys_reboot+0xf8/0x196
> > [ 74.256374] [<ffffffff8055b93f>] ? preempt_schedule+0x3c/0xaa
> > [ 74.256374] [<ffffffff8055b9a4>] ? preempt_schedule+0xa1/0xaa
> > [ 74.256374] [<ffffffff8023e7eb>] ? sys_kill+0xd8/0x1c1
> > [ 74.256374] [<ffffffff8055c112>] ? do_nanosleep+0x4b/0xd6
> > [ 74.256374] [<ffffffff8020c21b>] system_call_after_swapgs+0x7b/0x80
> > [ 74.256374]
> > [ 74.256374]
> > [ 74.256374] Code: 57 80 48 0f 42 d0 48 8b 42 08 4c 8d 5d f7 8a 00 41 b8 01 00 00 00 88 45 f7 eb 1b 48 8b 17 4c 39 d2 72 0f 4c 39 ca 77 0a 41 8a 03 <88> 02 44 89 c0 0f a2 48 83 c7 08 48 39 f7 72 e0 5a 59 5b c9 c3
> > [ 74.256374] RIP [<ffffffff80211872>] alternatives_smp_unlock+0x66/0x7b
> > [ 74.256374] RSP <ffff81007ac63d10>
> > [ 74.256374] CR2: ffffffff8020a023
>
> Yes, I hit a similar one during halt on the t61p. But because of the
> netconsole bustage I was only able to see (on the screen) oops #2 - oops #1
> had scrolled off. oops #2 had a simlar trace and the EIP was in
> text_poke().

OK, I finally managed to catch the *other* failure I was seeing at shutdown,
and it appears to be a variant on the same theme, so readers may feel free to
ignore the rest of this note unless they care about the gory details...

Apparently, if I booted with 'ignore_loglevel' (which is my default when using
netconsole), I hit the above traceback and I'm dead in the water, no alt-sysrq,
need to hold down the power button for 5 seconds.

If I boot with 'quiet' instead, I get the below set of tracebacks, which caused
the original BUG to go scrolling off-screen and obfuscating that it's the same
failure. Adding to the confusion, if it failed in this mode, alt-sysrq still
worked just fine, so alt-sysrq-S-S-U-B got me a reboot.

Now that I know that at least *part* of the issue is the same, I can go
bisecting. Somebody *else* can ponder why ignore_loglevel/quiet causes the
big difference in behavior after the BUG, that part is beyond my ken...

[ 168.036824] BUG: unable to handle kernel paging request at ffffffff8020a023
[ 168.037300] IP: [<ffffffff80211872>] alternatives_smp_unlock+0x66/0x7b
[ 168.037745] PGD 203067 PUD 207063 PMD 7f989163 PTE 20a161
[ 168.037781] Oops: 0003 [1] PREEMPT SMP
[ 168.037781] last sysfs file: /sys/devices/platform/coretemp.1/temp1_input
[ 168.037781] CPU 0
[ 168.037781] Modules linked in: rtc irnet ppp_generic slhc irtty_sir sir_dev ircomm_tty ircomm irda crc_ccitt sha256_generic aes_generic acpi_cpufreq tpm_tis arc4 ecb iwl3945 pcmcia nvidia(P)(U) firmware_class mac80211 ohci1394 snd_hda_intel cfg80211 yenta_socket ieee1394 iTCO_wdt iTCO_vendor_support thermal rsrc_nonstatic ac processor watchdog_core battery watchdog_dev button pcmcia_core intel_agp [last unloaded: x_tables]
[ 168.037781] Pid: 3115, comm: halt Tainted: P 2.6.25-rc3-mm1 #8
[ 168.037781] RIP: 0010:[<ffffffff80211872>] [<ffffffff80211872>] alternatives_smp_unlock+0x66/0x7b
[ 168.037781] RSP: 0000:ffff81007dbebd10 EFLAGS: 00010093
[ 168.037781] RAX: ffffffff80573190 RBX: ffff81007f83a8c0 RCX: ffffffff80563cec
[ 168.037781] RDX: ffffffff8020a023 RSI: ffffffff8078a0b8 RDI: ffffffff80783018
[ 168.037781] RBP: ffff81007dbebd28 R08: 0000000000000001 R09: ffffffff80563cec
[ 168.037781] R10: ffffffff80200000 R11: ffff81007dbebd1f R12: 0000000000000000
[ 168.037781] R13: 0000000000000001 R14: 0000000000000246 R15: ffff810073200440
[ 168.037781] FS: 00007ffd6067a6f0(0000) GS:ffffffff8076e000(0000) knlGS:0000000000000000
[ 168.037781] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 168.037781] CR2: ffffffff8020a023 CR3: 000000007306e000 CR4: 00000000000006e0
[ 168.037781] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 168.037781] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 168.037781] Process halt (pid: 3115, threadinfo ffff81007dbea000, task ffff81007ef44440)
[ 168.037781] Stack: ffffffff8080df80 90ffffff8055ba3b ffff81007f83a8c0 ffff81007dbebd68
[ 168.037781] ffffffff80211a01 ffffffff807c6584 0000000000000001 ffffffff807c6584
[ 168.037781] 0000000000000001 0000000000000001 0000000000000001 ffff81007dbebd98
[ 168.037781] Call Trace:
[ 168.037781] [<ffffffff80211a01>] alternatives_smp_switch+0x17a/0x1b6
[ 168.037781] [<ffffffff80219dd3>] __cpu_die+0x58/0x87
[ 168.037781] [<ffffffff805498b2>] _cpu_down+0x1a4/0x28c
[ 168.037781] [<ffffffff80252e90>] disable_nonboot_cpus+0x60/0x108
[ 168.037781] [<ffffffff80241619>] kernel_power_off+0x21/0x3b
[ 168.037781] [<ffffffff80241863>] sys_reboot+0xf8/0x196
[ 168.037781] [<ffffffff80291233>] ? kfree+0x2b/0x1ac
[ 168.037781] [<ffffffff80265a44>] ? audit_syscall_entry+0x16e/0x1a2
[ 168.037781] [<ffffffff80213619>] ? syscall_trace_enter+0xa4/0xa9
[ 168.037781] [<ffffffff8020c32e>] ? tracesys+0x71/0xe1
[ 168.037781] [<ffffffff8020c399>] tracesys+0xdc/0xe1
[ 168.037781]
[ 168.037781]
[ 168.037781] Code: 57 80 48 0f 42 d0 48 8b 42 08 4c 8d 5d f7 8a 00 41 b8 01 00 00 00 88 45 f7 eb 1b 48 8b 17 4c 39 d2 72 0f 4c 39 ca 77 0a 41 8a 03 <88> 02 44 89 c0 0f a2 48 83 c7 08 48 39 f7 72 e0 5a 59 5b c9 c3
[ 168.037781] RIP [<ffffffff80211872>] alternatives_smp_unlock+0x66/0x7b
[ 168.037781] RSP <ffff81007dbebd10>
[ 168.037781] CR2: ffffffff8020a023
[ 168.037781] ---[ end trace 72339cb91f92973c ]---
[ 168.037781] note: halt[3115] exited with preempt_count 1
[ 168.038182] BUG: scheduling while atomic: halt/3115/0x00000002
[ 168.038789] Pid: 3115, comm: halt Tainted: P D 2.6.25-rc3-mm1 #8
[ 168.039791]
[ 168.039793] Call Trace:
[ 168.040795] [<ffffffff8055d761>] ? _spin_unlock_irqrestore+0x3a/0x45
[ 168.041796] [<ffffffff8022bc70>] __schedule_bug+0x5d/0x61
[ 168.042801] [<ffffffff8055ad42>] schedule+0x11a/0x9fd
[ 168.043801] [<ffffffff802e4dad>] ? release_sysfs_dirent+0x8c/0xac
[ 168.044797] [<ffffffff8055b9d5>] schedule_timeout+0x22/0xb4
[ 168.045797] [<ffffffff8037265e>] ? __list_add+0x62/0x9a
[ 168.046796] [<ffffffff8055ab53>] wait_for_common+0x109/0x152
[ 168.047816] [<ffffffff80228819>] ? default_wake_function+0x0/0xf
[ 168.048800] [<ffffffff8055ac26>] wait_for_completion+0x18/0x1a
[ 168.049798] [<ffffffff802428e2>] flush_cpu_workqueue+0x70/0x7c
[ 168.050793] [<ffffffff8024291c>] ? wq_barrier_func+0x0/0xf
[ 168.051794] [<ffffffff8024296e>] flush_workqueue+0x43/0x5d
[ 168.052794] [<ffffffff80242998>] flush_scheduled_work+0x10/0x12
[ 168.053795] [<ffffffff803bd0ce>] release_dev+0x529/0x6c6
[ 168.054799] [<ffffffff802894b5>] ? free_page_and_swap_cache+0x32/0x36
[ 168.055794] [<ffffffff80368bbe>] ? _atomic_dec_and_lock+0x5a/0x98
[ 168.056793] [<ffffffff80368bbe>] ? _atomic_dec_and_lock+0x5a/0x98
[ 168.057795] [<ffffffff803bd424>] tty_release+0x19/0x24
[ 168.058792] [<ffffffff8029630d>] __fput+0xc0/0x21d
[ 168.059793] [<ffffffff8029647e>] fput+0x14/0x16
[ 168.060796] [<ffffffff80292f7a>] filp_close+0x66/0x71
[ 168.061793] [<ffffffff802340a8>] put_files_struct+0x74/0xc3
[ 168.062793] [<ffffffff8023413e>] __exit_files+0x47/0x50
[ 168.063792] [<ffffffff80235c3b>] do_exit+0x39c/0x90b
[ 168.064792] [<ffffffff803ca25d>] ? do_unblank_screen+0x53/0x131
[ 168.065792] [<ffffffff8055e0ad>] oops_begin+0x0/0x90
[ 168.066791] [<ffffffff8020a023>] ? set_personality_64bit+0x14/0x32
[ 168.067794] [<ffffffff8055ff24>] do_page_fault+0x8b9/0x9ad
[ 168.068793] [<ffffffff8055d761>] ? _spin_unlock_irqrestore+0x3a/0x45
[ 168.069790] [<ffffffff80249e46>] ? up+0x42/0x47
[ 168.070790] [<ffffffff8055d761>] ? _spin_unlock_irqrestore+0x3a/0x45
[ 168.071790] [<ffffffff8023239e>] ? release_console_sem+0x1ae/0x1bb
[ 168.072792] [<ffffffff802329bb>] ? vprintk+0x377/0x3aa
[ 168.073791] [<ffffffff802329bb>] ? vprintk+0x377/0x3aa
[ 168.074792] [<ffffffff8055db19>] error_exit+0x0/0x51
[ 168.075795] [<ffffffff80563cec>] ? _etext+0x0/0x7b
[ 168.076790] [<ffffffff80563cec>] ? _etext+0x0/0x7b
[ 168.077787] [<ffffffff8020a023>] ? set_personality_64bit+0x14/0x32
[ 168.078790] [<ffffffff80211872>] ? alternatives_smp_unlock+0x66/0x7b
[ 168.079791] [<ffffffff80211a01>] ? alternatives_smp_switch+0x17a/0x1b6
[ 168.080791] [<ffffffff80219dd3>] ? __cpu_die+0x58/0x87
[ 168.082780] [<ffffffff805498b2>] ? _cpu_down+0x1a4/0x28c
[ 168.083792] [<ffffffff80252e90>] ? disable_nonboot_cpus+0x60/0x108
[ 168.084792] [<ffffffff80241619>] ? kernel_power_off+0x21/0x3b
[ 168.085787] [<ffffffff80241863>] ? sys_reboot+0xf8/0x196
[ 168.086789] [<ffffffff80291233>] ? kfree+0x2b/0x1ac
[ 168.087790] [<ffffffff80265a44>] ? audit_syscall_entry+0x16e/0x1a2
[ 168.088791] [<ffffffff80213619>] ? syscall_trace_enter+0xa4/0xa9
[ 168.089787] [<ffffffff8020c32e>] ? tracesys+0x71/0xe1
[ 168.090788] [<ffffffff8020c399>] ? tracesys+0xdc/0xe1
[ 168.091788]
[ 168.092814] BUG: scheduling while atomic: halt/3115/0x00000002
[ 168.093789] Pid: 3115, comm: halt Tainted: P D 2.6.25-rc3-mm1 #8
[ 168.094783]
[ 168.094785] Call Trace:
[ 168.095787] [<ffffffff8055d76a>] ? _spin_unlock_irqrestore+0x43/0x45
[ 168.096786] [<ffffffff80242721>] ? worker_thread+0xa9/0xee
[ 168.097786] [<ffffffff8022bc70>] __schedule_bug+0x5d/0x61
[ 168.098787] [<ffffffff8055ad42>] schedule+0x11a/0x9fd
[ 168.099790] [<ffffffff802e4dad>] ? release_sysfs_dirent+0x8c/0xac
[ 168.100792] [<ffffffff8055b9d5>] schedule_timeout+0x22/0xb4
[ 168.101787] [<ffffffff8037265e>] ? __list_add+0x62/0x9a
[ 168.102787] [<ffffffff8055ab53>] wait_for_common+0x109/0x152
[ 168.103786] [<ffffffff80228819>] ? default_wake_function+0x0/0xf
[ 168.104788] [<ffffffff8055ac26>] wait_for_completion+0x18/0x1a
[ 168.105784] [<ffffffff802428e2>] flush_cpu_workqueue+0x70/0x7c
[ 168.106785] [<ffffffff8024291c>] ? wq_barrier_func+0x0/0xf
[ 168.107786] [<ffffffff8024296e>] flush_workqueue+0x43/0x5d
[ 168.108785] [<ffffffff80242998>] flush_scheduled_work+0x10/0x12
[ 168.109788] [<ffffffff803bd0ce>] release_dev+0x529/0x6c6
[ 168.110787] [<ffffffff802894b5>] ? free_page_and_swap_cache+0x32/0x36
[ 168.111791] [<ffffffff80368bbe>] ? _atomic_dec_and_lock+0x5a/0x98
[ 168.112785] [<ffffffff80368bbe>] ? _atomic_dec_and_lock+0x5a/0x98
[ 168.113786] [<ffffffff803bd424>] tty_release+0x19/0x24
[ 168.114784] [<ffffffff8029630d>] __fput+0xc0/0x21d
[ 168.115784] [<ffffffff8029647e>] fput+0x14/0x16
[ 168.116783] [<ffffffff80292f7a>] filp_close+0x66/0x71
[ 168.117785] [<ffffffff802340a8>] put_files_struct+0x74/0xc3
[ 168.118788] [<ffffffff8023413e>] __exit_files+0x47/0x50
[ 168.119784] [<ffffffff80235c3b>] do_exit+0x39c/0x90b
[ 168.120783] [<ffffffff803ca25d>] ? do_unblank_screen+0x53/0x131
[ 168.121784] [<ffffffff8055e0ad>] oops_begin+0x0/0x90
[ 168.122782] [<ffffffff8020a023>] ? set_personality_64bit+0x14/0x32
[ 168.123782] [<ffffffff8055ff24>] do_page_fault+0x8b9/0x9ad
[ 168.124784] [<ffffffff8055d761>] ? _spin_unlock_irqrestore+0x3a/0x45
[ 168.126773] [<ffffffff80249e46>] ? up+0x42/0x47
[ 168.127781] [<ffffffff8055d761>] ? _spin_unlock_irqrestore+0x3a/0x45
[ 168.128785] [<ffffffff8023239e>] ? release_console_sem+0x1ae/0x1bb
[ 168.129783] [<ffffffff802329bb>] ? vprintk+0x377/0x3aa
[ 168.130783] [<ffffffff802329bb>] ? vprintk+0x377/0x3aa
[ 168.131783] [<ffffffff8055db19>] error_exit+0x0/0x51
[ 168.132818] [<ffffffff80563cec>] ? _etext+0x0/0x7b
[ 168.133810] [<ffffffff80563cec>] ? _etext+0x0/0x7b
[ 168.134813] [<ffffffff8020a023>] ? set_personality_64bit+0x14/0x32
[ 168.135807] [<ffffffff80211872>] ? alternatives_smp_unlock+0x66/0x7b
[ 168.136783] [<ffffffff80211a01>] ? alternatives_smp_switch+0x17a/0x1b6
[ 168.137785] [<ffffffff80219dd3>] ? __cpu_die+0x58/0x87
[ 168.138781] [<ffffffff805498b2>] ? _cpu_down+0x1a4/0x28c
[ 168.139784] [<ffffffff80252e90>] ? disable_nonboot_cpus+0x60/0x108
[ 168.140780] [<ffffffff80241619>] ? kernel_power_off+0x21/0x3b
[ 168.141779] [<ffffffff80241863>] ? sys_reboot+0xf8/0x196
[ 168.142781] [<ffffffff80291233>] ? kfree+0x2b/0x1ac
[ 168.143781] [<ffffffff80265a44>] ? audit_syscall_entry+0x16e/0x1a2
[ 168.144783] [<ffffffff80213619>] ? syscall_trace_enter+0xa4/0xa9
[ 168.145779] [<ffffffff8020c32e>] ? tracesys+0x71/0xe1
[ 168.146782] [<ffffffff8020c399>] ? tracesys+0xdc/0xe1
[ 168.147779]
[ 168.148798] halt used greatest stack depth: 3304 bytes left
[ 176.814710] SysRq : Emergency Sync
[ 176.815397] Emergency Sync complete
[ 177.804460] SysRq : Emergency Sync
[ 177.806194] Emergency Sync complete
[ 179.663923] SysRq : Emergency Remount R/O
[ 179.664927] Emergency Remount complete
[ 181.729629] SysRq : Emergency Sync
[ 181.730654] Emergency Sync complete
[ 184.781877] SysRq : Resetting

> I suppose one of us should bisect it.

I'll let you know what I find...

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