syzbot


KCSAN: data-race in exit_mm / mm_update_next_owner
Status: moderation: reported on 2020/07/04 18:12
Reported-by: syzbot+dfcff47717996ec0ac40@syzkaller.appspotmail.com
First crash: 705d, last: 12h39m

Sample crash report:
==================================================================
BUG: KCSAN: data-race in exit_mm / mm_update_next_owner

write to 0xffff8881297229c8 of 8 bytes by task 5142 on cpu 1:
 exit_mm+0x98/0x170 kernel/exit.c:503
 do_exit+0x51d/0x1720 kernel/exit.c:782
 do_group_exit+0xa5/0x160 kernel/exit.c:925
 get_signal+0xf54/0x1020 kernel/signal.c:2875
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:166
 exit_to_user_mode_prepare kernel/entry/common.c:201 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:294
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

read to 0xffff8881297229c8 of 8 bytes by task 5132 on cpu 0:
 mm_update_next_owner+0x23c/0x4e0 kernel/exit.c:435
 exit_mm+0xd3/0x170 kernel/exit.c:509
 do_exit+0x51d/0x1720 kernel/exit.c:782
 __x64_sys_exit_group+0x0/0x20 kernel/exit.c:925
 __do_sys_exit_group kernel/exit.c:936 [inline]
 __se_sys_exit_group kernel/exit.c:934 [inline]
 __x64_sys_exit_group+0x1b/0x20 kernel/exit.c:934
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

value changed: 0xffff8881084be800 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5132 Comm: syz-executor.5 Not tainted 5.18.0-syzkaller-02752-gfdaf9a5840ac-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1583):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2022/05/25 13:51 upstream fdaf9a5840ac 3037caa9 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/25 12:19 upstream fdaf9a5840ac 647c0e27 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/24 22:34 upstream 0350785b0a09 647c0e27 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/24 10:26 upstream 143a6252e1b8 fcfad4ff .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/23 23:58 upstream 140e40e39a29 e7f9308d .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/23 10:14 upstream 4b0986a3613c 4c7657cb .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/23 09:12 upstream 4b0986a3613c 7268fa62 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/22 20:05 upstream 978df3e15846 7268fa62 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/22 07:21 upstream eaea45fc0e7b 7268fa62 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/21 17:57 upstream 6c3f5bec9b40 7268fa62 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/21 06:28 upstream 3b5e1590a267 7268fa62 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/20 15:54 upstream 3d7285a335ed bd37ad7e .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/20 14:15 upstream 3d7285a335ed cb1ac2e7 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/20 01:30 upstream b015dcd62b86 cb1ac2e7 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/19 12:10 upstream f993aed406ea cb1ac2e7 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/19 06:17 upstream f993aed406ea 50c53f39 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/18 17:05 upstream ef1302160bfb 50c53f39 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/18 13:48 upstream 210e04ff7681 50c53f39 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/18 00:36 upstream 210e04ff7681 744a39e2 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/16 04:05 upstream 42226c989789 744a39e2 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/15 15:13 upstream bc403203d65a 744a39e2 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/15 03:36 upstream 2fe1020d73ca 744a39e2 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/14 10:50 upstream ec7f49619d8e 744a39e2 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/13 22:56 upstream f2dd007445b1 107f6434 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/13 09:14 upstream f3f19f939c11 9ad6612a .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/12 19:45 upstream 0ac824f379fb 9ad6612a .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/12 13:13 upstream feb9c5e19e91 9ad6612a .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/11 17:00 upstream feb9c5e19e91 beb0b407 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/11 00:08 upstream feb9c5e19e91 8d7b3b67 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/09 17:12 upstream 9be9ed2612b5 8b277b8e .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/09 09:31 upstream c5eb0a61238d 8b277b8e .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/09 07:56 upstream c5eb0a61238d e60b1103 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/09 06:54 upstream c5eb0a61238d e60b1103 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/09 05:50 upstream c5eb0a61238d e60b1103 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/09 04:50 upstream c5eb0a61238d e60b1103 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/09 03:13 upstream c5eb0a61238d e60b1103 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/09 01:19 upstream c5eb0a61238d e60b1103 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/09 00:02 upstream 379c72654524 e60b1103 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/08 23:00 upstream 379c72654524 e60b1103 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/08 21:36 upstream 379c72654524 e60b1103 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/08 20:08 upstream 379c72654524 e60b1103 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/08 19:04 upstream 379c72654524 e60b1103 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2022/05/08 17:29 upstream 30c8e80f7932 e60b1103 .config log report info KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce 2021/01/17 10:58 upstream 0da0a8a0a0e1 813be542 .config log report info
ci2-upstream-kcsan-gce 2020/07/04 13:08 upstream 35e884f89df4 4f739670 .config log report
ci2-upstream-kcsan-gce 2020/06/30 18:03 upstream 7c30b859a947 917afeaa .config log report
ci2-upstream-kcsan-gce 2020/06/19 02:44 upstream 5e857ce6eae7 bc258b50 .config log report