general protection fault in wait_consider_task (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: c196b3a9 Linux 4.14.210
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1568a19b500000
kernel config: https://syzkaller.appspot.com/x/.config?x=5e5088ac39d46cc4
dashboard link: https://syzkaller.appspot.com/bug?extid=8870fccbed426825a300
compiler: gcc (GCC) 10.1.0-syz 20200507

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8870fc...@syzkaller.appspotmail.com

netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'.
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 8007 Comm: syz-executor.0 Not tainted 4.14.210-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888098e0a080 task.stack: ffff8880ab618000
RIP: 0010:same_thread_group include/linux/sched/signal.h:573 [inline]
RIP: 0010:ptrace_reparented include/linux/ptrace.h:92 [inline]
RIP: 0010:wait_consider_task+0x191e/0x3350 kernel/exit.c:1371
RSP: 0018:ffff8880ab61fb40 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff8880001a2380 RCX: 0000070707070700
RDX: 000000e0e0e0e1c0 RSI: 0000000000000000 RDI: 0000070707070e00
RBP: ffff8880ab61fd1c R08: ffffffff8b994e50 R09: 000000000006008a
R10: ffff888098e0a908 R11: ffff888098e0a080 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8880ab61fd18 R15: ffff8880001a27fc
FS: 00000000031ec940(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005598c872f9c8 CR3: 00000000b525d000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
do_wait_thread kernel/exit.c:1448 [inline]
do_wait+0x3e9/0x930 kernel/exit.c:1519
kernel_wait4+0x107/0x1e0 kernel/exit.c:1661
SYSC_wait4 kernel/exit.c:1673 [inline]
SyS_wait4+0xfe/0x110 kernel/exit.c:1669
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x417ceb
RSP: 002b:00007fff9b5c2080 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 0000000000417ceb
RDX: 0000000040000001 RSI: 00007fff9b5c20e0 RDI: ffffffffffffffff
RBP: 00007fff9b5c20e0 R08: 0000000000000000 R09: 00000000031ec940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000040000001
R13: 00007fff9b5c20e0 R14: 00007fff9b5c20f0 R15: 000000000007569f
Code: ea 03 80 3c 02 00 0f 85 b5 15 00 00 48 8b 8b e8 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d b9 00 07 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 78 15 00 00 48 8b 81 00 07 00 00 49 8d bd 00
RIP: same_thread_group include/linux/sched/signal.h:573 [inline] RSP: ffff8880ab61fb40
RIP: ptrace_reparented include/linux/ptrace.h:92 [inline] RSP: ffff8880ab61fb40
RIP: wait_consider_task+0x191e/0x3350 kernel/exit.c:1371 RSP: ffff8880ab61fb40
---[ end trace b1607b382123a4fe ]---


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[syzbot]

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