WARNING in get

WARNING in get_signal
Status: upstream: reported syz repro on 2019/06/23 01:46
Reported-by: syzbot+439015f8184393926148@syzkaller.appspotmail.com
First crash: 145d, last: 145d

similar bugs (3):
Kernel	Title	Repro	Count	Last	Reported	Patched	Status
android-44	WARNING in get_signal	syz	15	281d	653d	0/2	closed as invalid on 2019/03/28 00:23
android-44	WARNING in get_signal (2)		4	115d	175d	0/2	public: reported on 2019/05/24 04:31
linux-4.19	WARNING in get_signal	syz	1	155d	155d	0/1	upstream: reported syz repro on 2019/06/13 12:31

Sample crash report:

IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
------------[ cut here ]------------
WARNING: CPU: 0 PID: 7191 at kernel/signal.c:2156 do_jobctl_trap kernel/signal.c:2156 [inline]
WARNING: CPU: 0 PID: 7191 at kernel/signal.c:2156 get_signal+0x18ed/0x1cd0 kernel/signal.c:2288
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 7191 Comm: syz-executor.0 Not tainted 4.14.129 #23
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+0x138/0x19c lib/dump_stack.c:53
 panic+0x1f2/0x426 kernel/panic.c:182
 __warn.cold+0x2f/0x36 kernel/panic.c:546
 report_bug+0x216/0x254 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+0x1bb/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:960
RIP: 0010:do_jobctl_trap kernel/signal.c:2156 [inline]
RIP: 0010:get_signal+0x18ed/0x1cd0 kernel/signal.c:2288
RSP: 0018:ffff88807395fc48 EFLAGS: 00010097
RAX: ffff8880a8da60c0 RBX: ffff8880a9689800 RCX: ffff8880a968989c
RDX: 0000000000000000 RSI: ffff8880a8da6940 RDI: ffff8880a9689898
RBP: ffff88807395fd00 R08: 0000000000006e8c R09: ffffffff88caf8a0
R10: ffff8880a8da6940 R11: ffff8880a8da60c0 R12: 0000000000000000
R13: 0000000000008000 R14: ffff88807395ff58 R15: dffffc0000000000
 do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814
 exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath+0x29e/0x330 arch/x86/entry/common.c:270
 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:397
RIP: 0033:0x4592c9
RSP: 002b:00007f46019dac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00000000004592c9
RDX: 9999999999999999 RSI: 0000000000000000 RDI: 000000000a01ffff
RBP: 000000000075bf20 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f46019db6d4
R13: 00000000004bf72a R14: 00000000004d0e18 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (1):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci2-linux-4-14	2019/06/23 00:45	linux-4.14.y	a5758c53	34bf9440	.config	log	report	syz		akpm@linux-foundation.org, ebiederm@xmission.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, oleg@redhat.com, sashal@kernel.org, weizhenliang@huawei.com, will.deacon@arm.com