syzbot

------------[ cut here ]------------
WARNING: CPU: 0 PID: 2273 at ./arch/x86/include/asm/thread_info.h:273 set_restore_sigmask arch/x86/include/asm/thread_info.h:273 [inline]()
WARNING: CPU: 0 PID: 2273 at ./arch/x86/include/asm/thread_info.h:273 sigsuspend kernel/signal.c:3534 [inline]()
WARNING: CPU: 0 PID: 2273 at ./arch/x86/include/asm/thread_info.h:273 sigsuspend+0x18d/0x1f0 kernel/signal.c:3527()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 2273 Comm: syz-executor923 Not tainted 4.4.174+ #4
 0000000000000000 368e7cdbe52a363d ffff8800b2bafd60 ffffffff81aad1a1
 0000000000000000 ffffffff82835ee0 ffffffff8283c0e0 0000000000000111
 ffffffff811027fd ffff8800b2bafe40 ffffffff813a48c2 0000000041b58ab3
Call Trace:
 [<ffffffff81aad1a1>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81aad1a1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff813a48c2>] panic+0x1b9/0x37b kernel/panic.c:112
 [<ffffffff813a4ab9>] warn_slowpath_common kernel/panic.c:455 [inline]
 [<ffffffff813a4ab9>] warn_slowpath_common.cold+0x20/0x20 kernel/panic.c:435
 [<ffffffff810d3aaa>] warn_slowpath_null+0x2a/0x30 kernel/panic.c:492
 [<ffffffff811027fd>] set_restore_sigmask arch/x86/include/asm/thread_info.h:273 [inline]
 [<ffffffff811027fd>] sigsuspend kernel/signal.c:3534 [inline]
 [<ffffffff811027fd>] sigsuspend+0x18d/0x1f0 kernel/signal.c:3527
 [<ffffffff81106d91>] SYSC_rt_sigsuspend kernel/signal.c:3554 [inline]
 [<ffffffff81106d91>] SyS_rt_sigsuspend+0xa1/0xf0 kernel/signal.c:3544
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Kernel Offset: disabled
Rebooting in 86400 seconds..