WARNING in task_participate_group_stop

Status: fixed on 2018/02/02 04:39
Reported-by: syzbot+c9f0eb0d2a5576ece331a767528e6b52b4ff1815@syzkaller.appspotmail.com
Fix commit: 426915796cca kernel/signal.c: remove the no longer needed SIGNAL_UNKILLABLE check in complete_signal()
First crash: 3338d, last: 3272d
▶ ▼ 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 syz, C inconclusive 8 1502d 2524d 0/1 upstream: reported C repro on 2019/12/02 14:36
android-6-12 WARNING in task_participate_group_stop origin:upstream -1 syz, C 5 56d 410d 0/1 premoderation: reported C repro on 2025/09/15 18:43
upstream WARNING in task_participate_group_stop (2) prio:low kernel -1 syz, C inconclusive unreliable 25 168d 3106d 29/29 fixed on 2026/07/15 08:27
android-414 WARNING in task_participate_group_stop -1 syz, C 2 2795d 2759d 0/1 public: reported C repro on 2019/04/12 00:01
android-44 WARNING in task_participate_group_stop (2) -1 syz, C 4 2795d 2758d 0/2 public: reported C repro on 2019/04/13 00:00
android-49 WARNING in task_participate_group_stop -1 syz, C 15 3215d 3372d 2/3 fixed on 2018/02/06 12:55
linux-4.19 WARNING in task_participate_group_stop -1 syz, C error 11 1503d 2524d 0/1 upstream: reported C repro on 2019/12/02 13:46
android-44 WARNING in task_participate_group_stop -1 syz, C 10 3224d 3231d 2/2 fixed on 2018/02/06 10:09
android-49 WARNING in task_participate_group_stop (2) -1 syz, C 11 2524d 2757d 0/3 public: reported C repro on 2019/04/14 00:00

Sample crash report:
WARNING: CPU: 0 PID: 1 at kernel/signal.c:340 task_participate_group_stop+0x1ce/0x230 kernel/signal.c:340
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 1 Comm: init Not tainted 4.13.0-mm1+ #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 panic+0x1e4/0x417 kernel/panic.c:181
 __warn+0x1c4/0x1d9 kernel/panic.c:542
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:178
 do_trap_no_signal arch/x86/kernel/traps.c:212 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:261
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:298
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:311
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905
RIP: 0010:task_participate_group_stop+0x1ce/0x230 kernel/signal.c:340
RSP: 0018:ffff8801d9ee77f0 EFLAGS: 00010097
RAX: ffff8801d9ed8040 RBX: ffff8801d9ed8040 RCX: ffff8801d9edb2c0
RDX: 0000000000000000 RSI: 0000000000060013 RDI: ffff8801d9ed84d0
RBP: ffff8801d9ee7808 R08: ffff8801d9ee7180 R09: ffff8801d9ee7178
R10: ffff8801d9ee70f0 R11: 1ffff1003b3db29b R12: ffff8801d9ee9740
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801d9ed85c8
 do_signal_stop+0x217/0x900 kernel/signal.c:2042
 get_signal+0x61c/0x17e0 kernel/signal.c:2297
 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808
 exit_to_usermode_loop+0x224/0x300 arch/x86/entry/common.c:158
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath+0x42f/0x500 arch/x86/entry/common.c:266
 entry_SYSCALL_64_fastpath+0xbc/0xbe
RIP: 0033:0x7f33f723fdd3
RSP: 002b:00007fffb5303398 EFLAGS: 00000246 ORIG_RAX: 0000000000000017
RAX: fffffffffffffdfe RBX: 00007fffb5303540 RCX: 00007f33f723fdd3
RDX: 0000000000000000 RSI: 00007fffb53036f0 RDI: 000000000000000b
RBP: 00007fffb53036f0 R08: 00007fffb5303770 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00007fffb5303ad0 R14: 0000000000000000 R15: 0000000000000000

Crashes (29):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2017/09/10 03:15 mmots d95e159cd1da 449b6f15 .config console log report syz C ci-upstream-mmots-kasan-gce
2017/11/06 02:09 upstream 9b3499d752fc ff12ae31 .config console log report syz ci-upstream-kasan-gce
2017/11/06 02:09 upstream 9b3499d752fc ff12ae31 .config console log report syz ci-upstream-kasan-gce
2017/09/10 03:33 upstream fbf4432ff71b d18bfda0 .config console log report syz ci-upstream-kasan-gce
2017/11/14 03:50 upstream 43ff2f4db9d0 cf38de00 .config console log report syz ci-upstream-kasan-gce-386
2017/10/19 04:15 upstream 3e0cc09a3a2c fe864987 .config console log report syz ci-upstream-kasan-gce-386
2017/10/19 04:14 upstream 3e0cc09a3a2c fe864987 .config console log report syz ci-upstream-kasan-gce-386
2017/11/14 14:26 linux-next c9b945f2a731 cf38de00 .config console log report syz skylake-linux-next-kasan-qemu
2017/11/14 03:47 linux-next c348a99ee55f f9a8d567 .config console log report syz ci-upstream-next-kasan-gce
2017/11/14 03:47 mmots 97530111c84b 00f6ff58 .config console log report syz ci-upstream-mmots-kasan-gce
2017/11/06 02:09 linux-next 5a3517e009e9 e0a2b195 .config console log report syz ci-upstream-next-kasan-gce
2017/11/06 02:08 mmots 0f611fb6dcc0 e0a2b195 .config console log report syz ci-upstream-mmots-kasan-gce
2017/11/06 02:01 linux-next 5a3517e009e9 e0a2b195 .config console log report syz ci-upstream-next-kasan-gce
2017/10/28 10:16 linux-next 36ef71cae353 e511d9f8 .config console log report syz ci-upstream-next-kasan-gce
2017/10/19 04:15 linux-next a7dd40274d75 fe864987 .config console log report syz ci-upstream-next-kasan-gce
2017/10/19 04:13 mmots 3ac81ebcbbb3 355f57c5 .config console log report syz ci-upstream-mmots-kasan-gce
2017/09/10 04:40 linux-next 58bcd35f859b d18bfda0 .config console log report syz skylake-linux-next-kasan-qemu
2017/09/10 03:48 linux-next 58bcd35f859b d18bfda0 .config console log report syz skylake-linux-next-kasan-qemu
2017/09/19 01:48 upstream ebb2c2437d80 d394531e .config console log report ci-upstream-kasan-gce
2017/09/19 01:44 upstream ebb2c2437d80 d394531e .config console log report ci-upstream-kasan-gce
2017/09/18 05:57 upstream 0666f560b71b 96b8e399 .config console log report ci-upstream-kasan-gce
2017/11/13 05:15 upstream 152bbb43b30c e0a2b195 .config console log report ci-upstream-kasan-gce-386
2017/10/20 19:08 linux-next 36ef71cae353 e511d9f8 .config console log report ci-upstream-next-kasan-gce
2017/09/28 15:58 mmots da2915ba6bbf c26ea367 .config console log report ci-upstream-mmots-kasan-gce
2017/09/24 00:21 mmots 720bbe532b7c c26ea367 .config console log report ci-upstream-mmots-kasan-gce
2017/09/15 09:27 linux-next 1f183459b514 da1873aa .config console log report skylake-linux-next-kasan-qemu
2017/09/11 10:27 mmots d95e159cd1da 449b6f15 .config console log report ci-upstream-mmots-kasan-gce
2017/09/10 15:09 mmots d95e159cd1da 449b6f15 .config console log report ci-upstream-mmots-kasan-gce
2017/09/10 02:53 mmots d95e159cd1da 449b6f15 .config console log report ci-upstream-mmots-kasan-gce
* Struck through repros no longer work on HEAD.