WARNING in task_participate_group_stop (2)

Status: public: reported C repro on 2019/04/14 00:00
Reported-by: syzbot+50216a2da4105c14d187@syzkaller.appspotmail.com
First crash: 3007d, last: 2425d
▶ ▼ Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 WARNING in task_participate_group_stop -1 C inconclusive 8 1402d 2425d 0/1 upstream: reported C repro on 2019/12/02 14:36
android-6-12 WARNING in task_participate_group_stop origin:upstream -1 C 4 3d21h 311d 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 69d 3007d 29/29 fixed on 2026/07/15 08:27
android-414 WARNING in task_participate_group_stop -1 C 2 2696d 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 2696d 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 3188d 4/29 fixed on 2018/02/02 04:39
linux-4.19 WARNING in task_participate_group_stop -1 C error 11 1404d 2425d 0/1 upstream: reported C repro on 2019/12/02 13:46
android-44 WARNING in task_participate_group_stop -1 C 10 3125d 3132d 2/2 fixed on 2018/02/06 10:09

Sample crash report:
random: crng init done
------------[ cut here ]------------
WARNING: CPU: 0 PID: 2071 at kernel/signal.c:343 task_participate_group_stop+0x220/0x2c0 kernel/signal.c:343
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 2071 Comm: 5 Not tainted 4.9.141+ #1
 ffff8801cd94fa60 ffffffff81b42e79 ffffffff82a38ce0 00000000ffffffff
 ffffffff82a3fc00 0000000000000000 0000000000000009 ffff8801cd94fb20
 ffffffff813f7125 0000000041b58ab3 ffffffff82e2b62b ffffffff813f6f66
Call Trace:
 [<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff813f7125>] panic+0x1bf/0x39f kernel/panic.c:179
 [<ffffffff813f7362>] __warn.cold.8+0x2f/0x2f kernel/panic.c:542
 [<ffffffff810dc02c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff811064b0>] task_participate_group_stop+0x220/0x2c0 kernel/signal.c:343
 [<ffffffff8110ac93>] do_signal_stop+0x373/0x7c0 kernel/signal.c:2028
 [<ffffffff8110ec3c>] get_signal+0x5bc/0x1460 kernel/signal.c:2205
 [<ffffffff81052aa5>] do_signal+0x95/0x1b00 arch/x86/kernel/signal.c:807
 [<ffffffff81003e2e>] exit_to_usermode_loop+0x10e/0x150 arch/x86/entry/common.c:158
 [<ffffffff81005932>] prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 [<ffffffff81005932>] syscall_return_slowpath arch/x86/entry/common.c:263 [inline]
 [<ffffffff81005932>] do_syscall_64+0x3e2/0x550 arch/x86/entry/common.c:290
 [<ffffffff82817893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/03/06 18:48 https://android.googlesource.com/kernel/common android-4.9 8fe428403e30 05cf83bf .config console log report syz C ci-android-49-kasan-gce
2019/03/06 18:46 https://android.googlesource.com/kernel/common android-4.9 1597fdfe52ba 05cf83bf .config console log report syz C ci-android-49-kasan-gce-root
2018/04/28 22:25 https://android.googlesource.com/kernel/common android-4.9 71fce1edd26d d5a5d045 .config console log report syz C ci-android-49-kasan-gce-root
2018/04/28 22:07 https://android.googlesource.com/kernel/common android-4.9 71fce1edd26d d5a5d045 .config console log report syz C ci-android-49-kasan-gce
2019/12/02 14:55 android-4.9 a36b5017c810 f879db37 .config console log report syz ci-android-49-kasan-gce-root
2019/12/02 12:45 https://android.googlesource.com/kernel/common android-4.9 8fe428403e30 f879db37 .config console log report syz ci-android-49-kasan-gce
2019/12/02 12:45 https://android.googlesource.com/kernel/common android-4.9 8fe428403e30 f879db37 .config console log report syz ci-android-49-kasan-gce-386
2019/03/06 18:47 https://android.googlesource.com/kernel/common android-4.9 8fe428403e30 05cf83bf .config console log report syz ci-android-49-kasan-gce-386
2018/04/28 22:06 https://android.googlesource.com/kernel/common android-4.9 71fce1edd26d d5a5d045 .config console log report syz ci-android-49-kasan-gce-386
2018/09/23 03:44 https://android.googlesource.com/kernel/common android-4.9 1c57ba4f543b 37079712 .config console log report ci-android-49-kasan-gce
2018/05/12 00:36 https://android.googlesource.com/kernel/common android-4.9 c2f9bce9fee8 12c7428a .config console log report ci-android-49-kasan-gce
* Struck through repros no longer work on HEAD.