Messages in this thread | | | Date | Mon, 04 Nov 2019 03:27:08 -0800 | Subject | KCSAN: data-race in mem_cgroup_select_victim_node / mem_cgroup_select_victim_node | From | syzbot <> |
| |
Hello,
syzbot found the following crash on:
HEAD commit: 05f22368 x86, kcsan: Enable KCSAN for x86 git tree: https://github.com/google/ktsan.git kcsan console output: https://syzkaller.appspot.com/x/log.txt?x=1774c6c0e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=87d111955f40591f dashboard link: https://syzkaller.appspot.com/bug?extid=234d50ad314ef67bcd16 compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+234d50ad314ef67bcd16@syzkaller.appspotmail.com
================================================================== BUG: KCSAN: data-race in mem_cgroup_select_victim_node / mem_cgroup_select_victim_node
write to 0xffff88809fade9b0 of 4 bytes by task 8603 on cpu 0: mem_cgroup_select_victim_node+0xb5/0x3d0 mm/memcontrol.c:1686 try_to_free_mem_cgroup_pages+0x175/0x4c0 mm/vmscan.c:3376 reclaim_high.constprop.0+0xf7/0x140 mm/memcontrol.c:2349 mem_cgroup_handle_over_high+0x96/0x180 mm/memcontrol.c:2430 tracehook_notify_resume include/linux/tracehook.h:197 [inline] exit_to_usermode_loop+0x20c/0x2c0 arch/x86/entry/common.c:163 prepare_exit_to_usermode+0x180/0x1a0 arch/x86/entry/common.c:194 swapgs_restore_regs_and_return_to_usermode+0x0/0x40
read to 0xffff88809fade9b0 of 4 bytes by task 7290 on cpu 1: mem_cgroup_select_victim_node+0x92/0x3d0 mm/memcontrol.c:1675 try_to_free_mem_cgroup_pages+0x175/0x4c0 mm/vmscan.c:3376 reclaim_high.constprop.0+0xf7/0x140 mm/memcontrol.c:2349 mem_cgroup_handle_over_high+0x96/0x180 mm/memcontrol.c:2430 tracehook_notify_resume include/linux/tracehook.h:197 [inline] exit_to_usermode_loop+0x20c/0x2c0 arch/x86/entry/common.c:163 prepare_exit_to_usermode+0x180/0x1a0 arch/x86/entry/common.c:194 swapgs_restore_regs_and_return_to_usermode+0x0/0x40
Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 7290 Comm: syz-executor.1 Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 7290 Comm: syz-executor.1 Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xf5/0x159 lib/dump_stack.c:113 panic+0x210/0x640 kernel/panic.c:221 kcsan_report.cold+0xc/0x10 kernel/kcsan/report.c:302 __kcsan_setup_watchpoint+0x32e/0x4a0 kernel/kcsan/core.c:411 __tsan_read4 kernel/kcsan/kcsan.c:35 [inline] __tsan_read4+0x2c/0x30 kernel/kcsan/kcsan.c:35 mem_cgroup_select_victim_node+0x92/0x3d0 mm/memcontrol.c:1675 try_to_free_mem_cgroup_pages+0x175/0x4c0 mm/vmscan.c:3376 reclaim_high.constprop.0+0xf7/0x140 mm/memcontrol.c:2349 mem_cgroup_handle_over_high+0x96/0x180 mm/memcontrol.c:2430 tracehook_notify_resume include/linux/tracehook.h:197 [inline] exit_to_usermode_loop+0x20c/0x2c0 arch/x86/entry/common.c:163 prepare_exit_to_usermode+0x180/0x1a0 arch/x86/entry/common.c:194 retint_user+0x8/0x8 RIP: 0033:0x45862a Code: 48 85 db 74 b6 41 bc ca 00 00 00 eb 0c 0f 1f 00 48 8b 5b 08 48 85 db 74 a2 48 8b 3b 48 8b 47 10 48 85 c0 74 05 ff d0 48 8b 3b <f0> ff 4f 28 0f 94 c0 84 c0 74 db 8b 47 2c 85 c0 74 d4 45 31 d2 ba RSP: 002b:00007ffec3569600 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00007ffec3569600 RCX: 00000000004584ca RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000a76d48 RBP: 00007ffec3569640 R08: 0000000000000001 R09: 000000000269f940 R10: 000000000269fc10 R11: 0000000000000246 R12: 00000000000000ca R13: 0000000000000079 R14: 0000000000000000 R15: 00007ffec3569690 Kernel Offset: disabled Rebooting in 86400 seconds..
--- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
| |