[ 36.720666][ T26] audit: type=1800 audit(1555320606.168:27): pid=7539 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 36.748133][ T26] audit: type=1800 audit(1555320606.168:28): pid=7539 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 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. [ 37.783873][ T26] audit: type=1800 audit(1555320607.298:29): pid=7539 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 37.807864][ T26] audit: type=1800 audit(1555320607.298:30): pid=7539 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 64.734149][ T7693] WARNING: CPU: 0 PID: 7693 at include/linux/cpumask.h:121 io_uring_setup+0x13cd/0x1a30 [ 64.744321][ T7693] Kernel panic - not syncing: panic_on_warn set ... [ 64.751301][ T7693] CPU: 0 PID: 7693 Comm: syz-executor763 Not tainted 5.1.0-rc5 #68 [ 64.759414][ T7693] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.769853][ T7693] Call Trace: [ 64.773428][ T7693] dump_stack+0x172/0x1f0 [ 64.777984][ T7693] ? io_uring_setup+0x1390/0x1a30 [ 64.783283][ T7693] panic+0x2cb/0x65c [ 64.787434][ T7693] ? __warn_printk+0xf3/0xf3 [ 64.792039][ T7693] ? io_uring_setup+0x13cd/0x1a30 [ 64.797299][ T7693] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 64.803741][ T7693] ? __warn.cold+0x5/0x45 [ 64.808085][ T7693] ? __warn+0xe8/0x1d0 [ 64.812324][ T7693] ? io_uring_setup+0x13cd/0x1a30 [ 64.818013][ T7693] __warn.cold+0x20/0x45 [ 64.822570][ T7693] ? io_uring_setup+0x13cd/0x1a30 [ 64.827701][ T7693] report_bug+0x263/0x2b0 [ 64.833185][ T7693] do_error_trap+0x11b/0x200 [ 64.838231][ T7693] do_invalid_op+0x37/0x50 [ 64.843114][ T7693] ? io_uring_setup+0x13cd/0x1a30 [ 64.848720][ T7693] invalid_op+0x14/0x20 [ 64.852880][ T7693] RIP: 0010:io_uring_setup+0x13cd/0x1a30 [ 64.858706][ T7693] 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 [ 64.878851][ T7693] RSP: 0018:ffff88808924fdc0 EFLAGS: 00010293 [ 64.885131][ T7693] RAX: ffff8880866ce640 RBX: 00000000ffffffff RCX: ffffffff81c814f7 [ 64.893864][ T7693] RDX: 0000000000000000 RSI: ffffffff81c81c3d RDI: 0000000000000005 [ 64.903074][ T7693] RBP: ffff88808924fef0 R08: ffff8880866ce640 R09: ffffed10150e754c [ 64.912306][ T7693] R10: ffffed10150e754b R11: ffff8880a873aa5f R12: ffff8880a8b455c0 [ 64.921109][ T7693] R13: ffff88808924fec8 R14: ffff8880a8b45650 R15: ffff8880a8b45614 [ 64.930203][ T7693] ? io_uring_setup+0xc87/0x1a30 [ 64.935268][ T7693] ? io_uring_setup+0x13cd/0x1a30 [ 64.941433][ T7693] ? io_uring_release+0x50/0x50 [ 64.946997][ T7693] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 64.953671][ T7693] ? do_syscall_64+0x26/0x610 [ 64.958838][ T7693] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 64.965567][ T7693] ? do_syscall_64+0x26/0x610 [ 64.970788][ T7693] ? lockdep_hardirqs_on+0x418/0x5d0 [ 64.977332][ T7693] __x64_sys_io_uring_setup+0x54/0x80 [ 64.983190][ T7693] do_syscall_64+0x103/0x610 [ 64.988268][ T7693] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 64.994517][ T7693] RIP: 0033:0x440239 [ 64.998660][ T7693] 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 [ 65.019572][ T7693] RSP: 002b:00007ffd6ec2ab88 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 65.028703][ T7693] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440239 [ 65.037636][ T7693] RDX: 0000000000400b60 RSI: 0000000020000140 RDI: 000000000000014a [ 65.045835][ T7693] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 65.055027][ T7693] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401ac0 [ 65.064071][ T7693] R13: 0000000000401b50 R14: 0000000000000000 R15: 0000000000000000 [ 65.075496][ T7693] Kernel Offset: disabled [ 65.080245][ T7693] Rebooting in 86400 seconds..