kernel panic: Attempted to kill init! (3)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: f44ed2c9 Merge 4.9.140 into android-4.9
git tree: android-4.9
console output: https://syzkaller.appspot.com/x/log.txt?x=1388b77b400000
kernel config: https://syzkaller.appspot.com/x/.config?x=68e2868d84e56109
dashboard link: https://syzkaller.appspot.com/bug?extid=a9d103c23b8de69a8d13
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=107b76f5400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10100a25400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a9d103...@syzkaller.appspotmail.com

Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000005

CPU: 0 PID: 1 Comm: init Not tainted 4.9.140+ #3
ffff8801da607980 ffffffff81b42e79 ffffffff82a3aec0 00000000ffffffff
ffff8801da618000 0000000000000000 ffff8801da618010 ffff8801da607a40
ffffffff813f7125 0000000041b58ab3 ffffffff82e2b45b ffffffff813f6f66
Call Trace:
[<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
[<ffffffff813f7125>] panic+0x1bf/0x39f kernel/panic.c:179
[<ffffffff813f80a1>] find_child_reaper kernel/exit.c:548 [inline]
[<ffffffff813f80a1>] forget_original_parent kernel/exit.c:637 [inline]
[<ffffffff813f80a1>] exit_notify kernel/exit.c:673 [inline]
[<ffffffff813f80a1>] do_exit.cold.6+0x84/0x22e kernel/exit.c:855
[<ffffffff810ed3a1>] do_group_exit+0x111/0x300 kernel/exit.c:937
[<ffffffff8110eb61>] get_signal+0x4e1/0x1460 kernel/signal.c:2321
[<ffffffff81052aa5>] do_signal+0x95/0x1b00 arch/x86/kernel/signal.c:807
[<ffffffff81003e2e>] exit_to_usermode_loop+0x10e/0x150
arch/x86/entry/common.c:158
[<ffffffff81005932>] prepare_exit_to_usermode arch/x86/entry/common.c:194
[inline]
[<ffffffff81005932>] syscall_return_slowpath arch/x86/entry/common.c:263
[inline]
[<ffffffff81005932>] do_syscall_64+0x3e2/0x550 arch/x86/entry/common.c:290
[<ffffffff828176d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..


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