WARNING in get

WARNING in get_signal
Status: upstream: reported C repro on 2019/06/23 01:46
Reported-by: syzbot+439015f8184393926148@syzkaller.appspotmail.com
First crash: 582d, last: 105d

Fix bisection: failed (bisect log)

similar bugs (4):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
android-44	WARNING in get_signal	syz			15	717d	1090d	0/2	closed as invalid on 2019/03/28 00:23
android-44	WARNING in get_signal (2)				5	432d	611d	0/2	auto-closed as invalid on 2020/03/18 06:40
upstream	WARNING in get_signal	C	done		2	112d	114d	17/17	fixed on 2020/11/16 12:12
linux-4.19	WARNING in get_signal	C		error	2	131d	591d	0/1	upstream: reported C repro on 2019/06/13 12:31

Sample crash report:

wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6624 at kernel/signal.c:2170 do_jobctl_trap kernel/signal.c:2170 [inline]
WARNING: CPU: 0 PID: 6624 at kernel/signal.c:2170 get_signal+0x18df/0x1ca0 kernel/signal.c:2302
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6624 Comm: syz-executor886 Not tainted 4.14.198-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:do_jobctl_trap kernel/signal.c:2170 [inline]
RIP: 0010:get_signal+0x18df/0x1ca0 kernel/signal.c:2302
RSP: 0018:ffff888094f4fc68 EFLAGS: 00010097
RAX: ffff88809d4da000 RBX: ffff88809bfd9940 RCX: 0000000000005aab
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88809bfd99d8
RBP: 0000000000000000 R08: ffffffff8a0a9ed8 R09: 00000000000c0092
R10: ffff88809d4da888 R11: ffff88809d4da000 R12: 0000000000008000
R13: ffff888094f4ff58 R14: dffffc0000000000 R15: ffffffff87d16918
 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+0x295/0x320 arch/x86/entry/common.c:270
 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:397
RIP: 0033:0x449f79
RSP: 002b:00007fbdea1dbcf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: 0000000000000000 RBX: 00000000006e0c28 RCX: 0000000000449f79
RDX: 9999999999999999 RSI: 0000000000000000 RDI: 000000000007a900
RBP: 00000000006e0c20 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006e0c2c
R13: 00007ffec88624df R14: 00007fbdea1dc9c0 R15: 00000000006e0c2c
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (3):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci2-linux-4-14	2020/10/12 00:26	linux-4.14.y	cbfa1702	4a77ae0b	.config	log	report	syz	C	ebiederm@xmission.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, sashal@kernel.org, tglx@linutronix.de
ci2-linux-4-14	2020/02/19 21:35	linux-4.14.y	98db2bf2	47fae6e9	.config	log	report	syz	C	ebiederm@xmission.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, oleg@redhat.com, sashal@kernel.org, tglx@linutronix.de, weizhenliang@huawei.com
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