WARNING in get_signal (2)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 62872f95 Merge 4.4.174 into android-4.4
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=123dc6e4a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=47bc4dd423780c4a
dashboard link: https://syzkaller.appspot.com/bug?extid=c620887b6a5d61dbb152
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
userspace arch: i386

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+c62088...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 4916 at kernel/signal.c:2090 do_jobctl_trap
kernel/signal.c:2090 [inline]()
WARNING: CPU: 0 PID: 4916 at kernel/signal.c:2090 get_signal+0x12d4/0x1570
kernel/signal.c:2209()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 4916 Comm: syz-executor.2 Not tainted 4.4.174+ #17
0000000000000000 aeb35bb04591b620 ffff8801c0247a88 ffffffff81aad1a1
0000000000000000 ffffffff82835ee0 ffffffff8283bd40 000000000000082a
ffffffff81101854 ffff8801c0247b68 ffffffff813a48c2 0000000041b58ab3
Call Trace:
[<ffffffff81aad1a1>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81aad1a1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
[<ffffffff813a48c2>] panic+0x1b9/0x37b kernel/panic.c:112
[<ffffffff813a4ab9>] warn_slowpath_common kernel/panic.c:455 [inline]
[<ffffffff813a4ab9>] warn_slowpath_common.cold+0x20/0x20 kernel/panic.c:435
[<ffffffff810d3aaa>] warn_slowpath_null+0x2a/0x30 kernel/panic.c:492
[<ffffffff81101854>] do_jobctl_trap kernel/signal.c:2090 [inline]
[<ffffffff81101854>] get_signal+0x12d4/0x1570 kernel/signal.c:2209
[<ffffffff8100bd4c>] do_signal+0x9c/0x1840 arch/x86/kernel/signal.c:712
[<ffffffff81003da7>] exit_to_usermode_loop+0x127/0x170
arch/x86/entry/common.c:184
[<ffffffff810064b9>] prepare_exit_to_usermode arch/x86/entry/common.c:221
[inline]
[<ffffffff810064b9>] syscall_return_slowpath arch/x86/entry/common.c:286
[inline]
[<ffffffff810064b9>] do_syscall_32_irqs_on arch/x86/entry/common.c:336
[inline]
[<ffffffff810064b9>] do_fast_syscall_32+0x7a9/0xa90
arch/x86/entry/common.c:397
[<ffffffff8271a350>] sysenter_flags_fixed+0xd/0x1a
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.