[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 38.557874][ T26] audit: type=1800 audit(1555320658.040:25): pid=7693 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 38.595815][ T26] audit: type=1800 audit(1555320658.050:26): pid=7693 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 38.641741][ T26] audit: type=1800 audit(1555320658.050:27): pid=7693 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 '10.128.10.51' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 49.352737][ T7844] WARNING: CPU: 0 PID: 7844 at include/linux/cpumask.h:121 io_uring_setup+0x13cd/0x1a30 [ 49.362480][ T7844] Kernel panic - not syncing: panic_on_warn set ... [ 49.369086][ T7844] CPU: 0 PID: 7844 Comm: syz-executor696 Not tainted 5.1.0-rc5 #68 [ 49.376963][ T7844] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.387274][ T7844] Call Trace: [ 49.390590][ T7844] dump_stack+0x172/0x1f0 [ 49.394916][ T7844] ? io_uring_setup+0x1390/0x1a30 [ 49.399940][ T7844] panic+0x2cb/0x65c [ 49.403826][ T7844] ? __warn_printk+0xf3/0xf3 [ 49.408424][ T7844] ? io_uring_setup+0x13cd/0x1a30 [ 49.413443][ T7844] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.419680][ T7844] ? __warn.cold+0x5/0x45 [ 49.423995][ T7844] ? __warn+0xe8/0x1d0 [ 49.428050][ T7844] ? io_uring_setup+0x13cd/0x1a30 [ 49.433089][ T7844] __warn.cold+0x20/0x45 [ 49.437319][ T7844] ? io_uring_setup+0x13cd/0x1a30 [ 49.442334][ T7844] report_bug+0x263/0x2b0 [ 49.446657][ T7844] do_error_trap+0x11b/0x200 [ 49.451241][ T7844] do_invalid_op+0x37/0x50 [ 49.455648][ T7844] ? io_uring_setup+0x13cd/0x1a30 [ 49.460695][ T7844] invalid_op+0x14/0x20 [ 49.464853][ T7844] RIP: 0010:io_uring_setup+0x13cd/0x1a30 [ 49.470493][ T7844] Code: 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 84 18 fe ff ff 48 8b bd e8 fe ff ff e8 2d 80 e0 ff e9 07 fe ff ff e8 73 70 a8 ff <0f> 0b e9 bc f8 ff ff e8 67 70 a8 ff 49 8d 84 24 88 00 00 00 48 89 [ 49.490091][ T7844] RSP: 0018:ffff8880a593fdc0 EFLAGS: 00010293 [ 49.496237][ T7844] RAX: ffff8880a55c4400 RBX: 00000000ffffffff RCX: ffffffff81c814f7 [ 49.504202][ T7844] RDX: 0000000000000000 RSI: ffffffff81c81c3d RDI: 0000000000000005 [ 49.512192][ T7844] RBP: ffff8880a593fef0 R08: ffff8880a55c4400 R09: ffffed1010c1eafc [ 49.520161][ T7844] R10: ffffed1010c1eafb R11: ffff8880860f57df R12: ffff8880a88008c0 [ 49.528149][ T7844] R13: ffff8880a593fec8 R14: ffff8880a8800950 R15: ffff8880a8800914 [ 49.536230][ T7844] ? io_uring_setup+0xc87/0x1a30 [ 49.541171][ T7844] ? io_uring_setup+0x13cd/0x1a30 [ 49.546221][ T7844] ? io_uring_release+0x50/0x50 [ 49.551097][ T7844] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 49.556560][ T7844] ? do_syscall_64+0x26/0x610 [ 49.561255][ T7844] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.567327][ T7844] ? do_syscall_64+0x26/0x610 [ 49.572012][ T7844] ? lockdep_hardirqs_on+0x418/0x5d0 [ 49.577303][ T7844] __x64_sys_io_uring_setup+0x54/0x80 [ 49.582683][ T7844] do_syscall_64+0x103/0x610 [ 49.587275][ T7844] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.593163][ T7844] RIP: 0033:0x440239 [ 49.597042][ T7844] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 49.616648][ T7844] RSP: 002b:00007ffdbb7c0798 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 49.625064][ T7844] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440239 [ 49.633037][ T7844] RDX: 0000000000400b60 RSI: 0000000020000140 RDI: 000000000000014a [ 49.641024][ T7844] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 49.648999][ T7844] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401ac0 [ 49.656990][ T7844] R13: 0000000000401b50 R14: 0000000000000000 R15: 0000000000000000 [ 49.665902][ T7844] Kernel Offset: disabled [ 49.670375][ T7844] Rebooting in 86400 seconds..