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: 337d, last: 95d

Fix bisection: failed (bisect log)

similar bugs (3):
Kernel	Title	Repro	Count	Last	Reported	Patched	Status
android-44	WARNING in get_signal	syz	15	472d	845d	0/2	closed as invalid on 2019/03/28 00:23
android-44	WARNING in get_signal (2)		5	187d	366d	0/2	auto-closed as invalid on 2020/03/18 06:40
linux-4.19	WARNING in get_signal	C	2	6d15h	346d	0/1	upstream: reported C repro on 2019/06/13 12:31

Sample crash report:

audit: type=1400 audit(1582147938.457:36): avc:  denied  { map } for  pid=7448 comm="syz-executor244" path="/root/syz-executor244851835" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
------------[ cut here ]------------
WARNING: CPU: 1 PID: 7463 at kernel/signal.c:2165 do_jobctl_trap kernel/signal.c:2165 [inline]
WARNING: CPU: 1 PID: 7463 at kernel/signal.c:2165 get_signal+0x18ed/0x1cd0 kernel/signal.c:2297
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7463 Comm: syz-executor244 Not tainted 4.14.171-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+0x142/0x197 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x2f/0x2f kernel/panic.c:547
 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:963
RIP: 0010:do_jobctl_trap kernel/signal.c:2165 [inline]
RIP: 0010:get_signal+0x18ed/0x1cd0 kernel/signal.c:2297
RSP: 0018:ffff88808e5afc48 EFLAGS: 00010097
RAX: ffff888098950200 RBX: ffff888088761240 RCX: ffff8880887612dc
RDX: 0000000000000000 RSI: ffff888098950a80 RDI: ffff8880887612d8
RBP: ffff88808e5afd00 R08: 0000000000005aab R09: ffffffff8957bdd8
R10: ffff888098950a80 R11: ffff888098950200 R12: 0000000000000000
R13: 0000000000008000 R14: ffff88808e5aff58 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: 0033:0x446749
RSP: 002b:00007fd19a9fedb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: 0000000000000000 RBX: 00000000006dbc28 RCX: 0000000000446749
RDX: 9999999999999999 RSI: 0000000000000000 RDI: 000000000a01ffff
RBP: 00000000006dbc20 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c
R13: 00007ffdb491bddf R14: 00007fd19a9ff9c0 R15: 20c49ba5e353f7cf
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (2):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
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