WARNING in task_participate_group_stop

Status: upstream: reported C repro on 2019/12/02 14:36
Reported-by: syzbot+8938286497acfbea0a8d@syzkaller.appspotmail.com
First crash: 2425d, last: 1402d
Fix bisection the fix commit could be any of (bisect log):
  4520f06b03ae Linux 4.14.175
  56dfe6252c68 Linux 4.14.188
   
▶ ▼ Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-12 WARNING in task_participate_group_stop origin:upstream -1 C 4 3d17h 310d 0/1 premoderation: reported C repro on 2025/09/15 18:43
upstream WARNING in task_participate_group_stop (2) prio:low kernel -1 C inconclusive unreliable 25 68d 3006d 29/29 fixed on 2026/07/15 08:27
android-414 WARNING in task_participate_group_stop -1 C 2 2695d 2659d 0/1 public: reported C repro on 2019/04/12 00:01
android-44 WARNING in task_participate_group_stop (2) -1 C 4 2695d 2658d 0/2 public: reported C repro on 2019/04/13 00:00
android-49 WARNING in task_participate_group_stop -1 C 15 3116d 3273d 2/3 fixed on 2018/02/06 12:55
upstream WARNING in task_participate_group_stop -1 C 29 3173d 3187d 4/29 fixed on 2018/02/02 04:39
linux-4.19 WARNING in task_participate_group_stop -1 C error 11 1403d 2425d 0/1 upstream: reported C repro on 2019/12/02 13:46
android-44 WARNING in task_participate_group_stop -1 C 10 3124d 3131d 2/2 fixed on 2018/02/06 10:09
android-49 WARNING in task_participate_group_stop (2) -1 C 11 2425d 2657d 0/3 public: reported C repro on 2019/04/14 00:00
▶ ▼ Last patch testing requests (7)
Created Duration User Patch Repo Result
2022/09/17 08:29 10m retest repro linux-4.14.y report log
2022/09/17 07:29 10m retest repro linux-4.14.y report log
2022/09/17 06:29 9m retest repro linux-4.14.y report log
2022/09/17 04:29 10m retest repro linux-4.14.y report log
2022/09/17 03:29 10m retest repro linux-4.14.y report log
2022/09/17 02:29 10m retest repro linux-4.14.y report log
2022/09/17 01:29 10m retest repro linux-4.14.y report log
▶ ▼ Fix bisection attempts (7)
Created Duration User Patch Repo Result
2020/07/09 17:49 30m bisect fix linux-4.14.y OK (2) job log
2020/06/09 17:24 24m bisect fix linux-4.14.y OK (0) job log log
2020/05/10 16:59 24m bisect fix linux-4.14.y OK (0) job log log
2020/04/01 00:02 23m bisect fix linux-4.14.y OK (0) job log log
2020/03/01 23:38 23m bisect fix linux-4.14.y OK (0) job log log
2020/01/31 18:12 27m bisect fix linux-4.14.y OK (0) job log log
2020/01/01 14:04 23m bisect fix linux-4.14.y OK (0) job log log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8020 at kernel/signal.c:358 task_participate_group_stop+0x237/0x2b0 kernel/signal.c:358
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 8020 Comm: 4 Not tainted 4.14.212-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x4b kernel/panic.c:547
 report_bug+0x208/0x249 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:task_participate_group_stop+0x237/0x2b0 kernel/signal.c:358
RSP: 0018:ffff88808bddfbc0 EFLAGS: 00010097
RAX: ffff8880b18723c0 RBX: 0000000000000000 RCX: 0000000000007cec
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880b1872ac0
RBP: ffff8880a709a0d8 R08: ffffffff8b9c7220 R09: 00000000000c008d
R10: ffff8880b1872c48 R11: ffff8880b18723c0 R12: ffff8880a709a040
R13: ffff8880b1872850 R14: 0000000000040000 R15: 0000000000000013
 do_signal_stop+0x1ab/0x770 kernel/signal.c:2112
 get_signal+0xd2c/0x1ca0 kernel/signal.c:2298
 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:814
 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0023:0xb7000000
RSP: 002b:00000000ffa92930 EFLAGS: 00000200 ORIG_RAX: 000000000000000b
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/12/26 23:24 linux-4.14.y 3f2ecb86cb90 821e0b09 .config console log report syz C ci2-linux-4-14
2020/04/10 16:59 linux-4.14.y 4520f06b03ae a8c6a3f8 .config console log report syz C ci2-linux-4-14
2022/09/20 00:09 linux-4.14.y 5df8b4735177 dd9a85ff .config console log report syz [disk image] [vmlinux] ci2-linux-4-14 WARNING in task_participate_group_stop
2021/05/05 16:21 linux-4.14.y 7d7d1c0ab3eb 06c27ff5 .config console log report syz ci2-linux-4-14 WARNING in task_participate_group_stop
2021/04/11 08:36 linux-4.14.y 958e517f4e16 6a81331a .config console log report syz ci2-linux-4-14 WARNING in task_participate_group_stop
2021/04/08 16:44 linux-4.14.y 0cc244011f40 6a81331a .config console log report syz ci2-linux-4-14 WARNING in task_participate_group_stop
2021/01/13 19:58 linux-4.14.y f79dc86058bc a945f0a3 .config console log report syz ci2-linux-4-14
2019/12/02 13:35 linux-4.14.y fbc5fe7a54d0 f879db37 .config console log report syz ci2-linux-4-14
* Struck through repros no longer work on HEAD.