syzbot


KCSAN: data-race in do_group_exit / do_group_exit (3)

Status: closed as invalid on 2020/06/18 14:24
Subsystems: kasan
[Documentation on labels]
First crash: 1430d, last: 1399d
Similar bugs (8)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in do_group_exit / do_group_exit kasan 1 1616d 1616d 0/26 closed as invalid on 2019/11/19 13:44
upstream KCSAN: data-race in do_group_exit / do_group_exit (4) kernel 6 1282d 1359d 0/26 auto-closed as invalid on 2020/10/28 04:41
upstream KCSAN: data-race in do_group_exit / do_group_exit (5) kernel 2 1180d 1186d 0/26 auto-closed as invalid on 2021/02/07 13:19
upstream KCSAN: data-race in do_group_exit / do_group_exit (8) kernel 1 261d 261d 0/26 auto-obsoleted due to no activity on 2023/08/15 00:36
upstream KCSAN: data-race in do_group_exit / do_group_exit (2) kasan 4 1567d 1583d 0/26 auto-closed as invalid on 2020/02/20 16:37
upstream KCSAN: data-race in do_group_exit / do_group_exit (9) kernel 1 221d 221d 0/26 auto-obsoleted due to no activity on 2023/09/23 23:34
upstream KCSAN: data-race in do_group_exit / do_group_exit (7) kernel 1 923d 923d 0/26 auto-closed as invalid on 2021/10/22 14:01
upstream KCSAN: data-race in do_group_exit / do_group_exit (6) kernel 12 1040d 1130d 0/26 auto-closed as invalid on 2021/06/27 02:37

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

write to 0xffff888129e368f4 of 4 bytes by task 15493 on cpu 0:
 do_group_exit+0x18d/0x1a0 kernel/exit.c:887
 __do_sys_exit_group kernel/exit.c:904 [inline]
 __se_sys_exit_group kernel/exit.c:902 [inline]
 __x64_sys_exit_group+0x2b/0x30 kernel/exit.c:902
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888129e368f4 of 4 bytes by task 15490 on cpu 1:
 do_group_exit+0x79/0x1a0 kernel/exit.c:876
 __do_sys_exit_group kernel/exit.c:904 [inline]
 __se_sys_exit_group kernel/exit.c:902 [inline]
 __x64_sys_exit_group+0x2b/0x30 kernel/exit.c:902
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 15490 Comm: syz-executor.4 Not tainted 5.7.0-rc1-syzkaller #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: 15490 Comm: syz-executor.4 Not tainted 5.7.0-rc1-syzkaller #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+0x11d/0x187 lib/dump_stack.c:118
 panic+0x210/0x640 kernel/panic.c:221
 kcsan_report.cold+0xc/0x1a kernel/kcsan/report.c:626
 kcsan_setup_watchpoint+0x3fb/0x440 kernel/kcsan/core.c:519
 do_group_exit+0x79/0x1a0 kernel/exit.c:876
 __do_sys_exit_group kernel/exit.c:904 [inline]
 __se_sys_exit_group kernel/exit.c:902 [inline]
 __x64_sys_exit_group+0x2b/0x30 kernel/exit.c:902
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ca29
Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffc762b90a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 000000000045ca29
RDX: 0000000000416621 RSI: fffffffffffffff7 RDI: 0000000000000000
RBP: 0000000000000000 R08: 000000002679e627 R09: 00007ffc762b9100
R10: ffffffff81007f9f R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc762b9100 R14: 0000000000000000 R15: 00007ffc762b9110
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/05/29 01:00 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 d19ed305 .config console log report ci2-upstream-kcsan-gce
2020/04/28 10:38 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 0ce7569e .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.