[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 38.282248][ T27] audit: type=1800 audit(1555105808.907:25): pid=7718 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 38.318381][ T27] audit: type=1800 audit(1555105808.907:26): pid=7718 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 38.345908][ T27] audit: type=1800 audit(1555105808.907:27): pid=7718 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.18' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 49.131210][ T7871] WARNING: CPU: 0 PID: 7871 at kernel/kthread.c:398 __kthread_bind_mask+0x3b/0xc0 [ 49.140420][ T7871] Kernel panic - not syncing: panic_on_warn set ... [ 49.146986][ T7871] CPU: 0 PID: 7871 Comm: syz-executor352 Not tainted 5.1.0-rc4+ #64 [ 49.154938][ T7871] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.164986][ T7871] Call Trace: [ 49.168262][ T7871] dump_stack+0x172/0x1f0 [ 49.172618][ T7871] ? __kthread_cancel_work+0x280/0x2e0 [ 49.178058][ T7871] panic+0x2cb/0x65c [ 49.181933][ T7871] ? __warn_printk+0xf3/0xf3 [ 49.186502][ T7871] ? __kthread_bind_mask+0x3b/0xc0 [ 49.191600][ T7871] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.197820][ T7871] ? __warn.cold+0x5/0x45 [ 49.202128][ T7871] ? __warn+0xe8/0x1d0 [ 49.206203][ T7871] ? __kthread_bind_mask+0x3b/0xc0 [ 49.211295][ T7871] __warn.cold+0x20/0x45 [ 49.215517][ T7871] ? __kthread_bind_mask+0x3b/0xc0 [ 49.220613][ T7871] report_bug+0x263/0x2b0 [ 49.224955][ T7871] do_error_trap+0x11b/0x200 [ 49.229540][ T7871] do_invalid_op+0x37/0x50 [ 49.233934][ T7871] ? __kthread_bind_mask+0x3b/0xc0 [ 49.239030][ T7871] invalid_op+0x14/0x20 [ 49.243176][ T7871] RIP: 0010:__kthread_bind_mask+0x3b/0xc0 [ 49.248870][ T7871] Code: 48 89 fb e8 27 88 24 00 4c 89 e6 48 89 df e8 dc e7 02 00 31 ff 49 89 c4 48 89 c6 e8 af 89 24 00 4d 85 e4 75 15 e8 05 88 24 00 <0f> 0b e8 fe 87 24 00 5b 41 5c 41 5d 41 5e 5d c3 e8 f0 87 24 00 4c [ 49.268457][ T7871] RSP: 0018:ffff88808b807bb8 EFLAGS: 00010293 [ 49.274504][ T7871] RAX: ffff8880a3686000 RBX: ffff888095e22000 RCX: ffffffff814c06f1 [ 49.282458][ T7871] RDX: 0000000000000000 RSI: ffffffff814c06fb RDI: 0000000000000007 [ 49.290412][ T7871] RBP: ffff88808b807bd8 R08: ffff8880a3686000 R09: 0000000000000000 [ 49.298369][ T7871] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 49.306338][ T7871] R13: ffffffff87691088 R14: ffff888095e22020 R15: ffffffff81c801d0 [ 49.314307][ T7871] ? io_ring_ctx_wait_and_kill+0x510/0x510 [ 49.320102][ T7871] ? __kthread_bind_mask+0x31/0xc0 [ 49.325284][ T7871] ? __kthread_bind_mask+0x3b/0xc0 [ 49.330380][ T7871] ? __kthread_bind_mask+0x3b/0xc0 [ 49.335490][ T7871] kthread_unpark+0x123/0x160 [ 49.340148][ T7871] kthread_stop+0xfa/0x6c0 [ 49.344552][ T7871] io_finish_async+0xab/0x180 [ 49.349210][ T7871] io_ring_ctx_wait_and_kill+0x133/0x510 [ 49.354823][ T7871] io_uring_release+0x42/0x50 [ 49.359479][ T7871] __fput+0x2e5/0x8d0 [ 49.363441][ T7871] ____fput+0x16/0x20 [ 49.367400][ T7871] task_work_run+0x14a/0x1c0 [ 49.371993][ T7871] do_exit+0x90a/0x2fa0 [ 49.376141][ T7871] ? mm_update_next_owner+0x640/0x640 [ 49.381498][ T7871] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 49.386952][ T7871] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 49.392394][ T7871] do_group_exit+0x135/0x370 [ 49.396967][ T7871] __x64_sys_exit_group+0x44/0x50 [ 49.401990][ T7871] do_syscall_64+0x103/0x610 [ 49.406569][ T7871] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.412454][ T7871] RIP: 0033:0x43ee98 [ 49.416340][ T7871] Code: Bad RIP value. [ 49.420405][ T7871] RSP: 002b:00007fffa0af02c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 49.428804][ T7871] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee98 [ 49.436785][ T7871] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 49.444762][ T7871] RBP: 00000000004be6a8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 49.452723][ T7871] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 49.460690][ T7871] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 49.469614][ T7871] Kernel Offset: disabled [ 49.474007][ T7871] Rebooting in 86400 seconds..