[ 35.100024][ T26] audit: type=1800 audit(1555106057.810:28): pid=7426 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. [ 35.978227][ T26] audit: type=1800 audit(1555106058.770:29): pid=7426 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 35.998566][ T26] audit: type=1800 audit(1555106058.770:30): pid=7426 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 [....] startpar: service(s) returned failure: ssh ...[?25l[?1c7[FAIL8[?25h[?0c failed! Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.8' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 53.050757][ T7600] WARNING: CPU: 1 PID: 7600 at include/linux/cpumask.h:121 io_uring_setup+0x13b2/0x1990 [ 53.060477][ T7600] Kernel panic - not syncing: panic_on_warn set ... [ 53.067041][ T7600] CPU: 1 PID: 7600 Comm: syz-executor594 Not tainted 5.1.0-rc4+ #65 [ 53.074989][ T7600] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.085016][ T7600] Call Trace: [ 53.088315][ T7600] dump_stack+0x172/0x1f0 [ 53.092657][ T7600] ? io_uring_setup+0x12e0/0x1990 [ 53.097661][ T7600] panic+0x2cb/0x65c [ 53.101531][ T7600] ? __warn_printk+0xf3/0xf3 [ 53.106103][ T7600] ? io_uring_setup+0x13b2/0x1990 [ 53.111143][ T7600] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.117361][ T7600] ? __warn.cold+0x5/0x45 [ 53.121663][ T7600] ? __warn+0xe8/0x1d0 [ 53.125709][ T7600] ? io_uring_setup+0x13b2/0x1990 [ 53.130731][ T7600] __warn.cold+0x20/0x45 [ 53.134948][ T7600] ? io_uring_setup+0x13b2/0x1990 [ 53.139948][ T7600] report_bug+0x263/0x2b0 [ 53.144254][ T7600] do_error_trap+0x11b/0x200 [ 53.148822][ T7600] do_invalid_op+0x37/0x50 [ 53.153210][ T7600] ? io_uring_setup+0x13b2/0x1990 [ 53.158214][ T7600] invalid_op+0x14/0x20 [ 53.162345][ T7600] RIP: 0010:io_uring_setup+0x13b2/0x1990 [ 53.167951][ T7600] Code: 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 80 3c 02 00 0f 84 18 fe ff ff 48 89 df e8 e8 80 e0 ff e9 0b fe ff ff e8 2e 79 a8 ff <0f> 0b e9 db f8 ff ff e8 22 79 a8 ff 49 8d 9c 24 88 00 00 00 48 b8 [ 53.187529][ T7600] RSP: 0018:ffff8880a8eb7dc0 EFLAGS: 00010293 [ 53.193582][ T7600] RAX: ffff88808cdd8700 RBX: 0000000000000400 RCX: ffffffff81c80eab [ 53.201532][ T7600] RDX: 0000000000000000 RSI: ffffffff81c815d2 RDI: 0000000000000005 [ 53.209497][ T7600] RBP: ffff8880a8eb7ef0 R08: ffff88808cdd8700 R09: ffffed1011c75244 [ 53.217442][ T7600] R10: ffffed1011c75243 R11: ffff88808e3a921f R12: ffff88808d34a480 [ 53.225389][ T7600] R13: ffff8880a8eb7ec8 R14: ffff88808d34a4c0 R15: ffff88808d34a4d4 [ 53.233351][ T7600] ? io_uring_setup+0xc8b/0x1990 [ 53.238263][ T7600] ? io_uring_setup+0x13b2/0x1990 [ 53.243278][ T7600] ? io_uring_release+0x50/0x50 [ 53.248120][ T7600] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 53.253551][ T7600] ? do_syscall_64+0x26/0x610 [ 53.258212][ T7600] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.264251][ T7600] ? do_syscall_64+0x26/0x610 [ 53.268909][ T7600] ? lockdep_hardirqs_on+0x418/0x5d0 [ 53.274169][ T7600] __x64_sys_io_uring_setup+0x54/0x80 [ 53.279518][ T7600] do_syscall_64+0x103/0x610 [ 53.284091][ T7600] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.289968][ T7600] RIP: 0033:0x440239 [ 53.293839][ T7600] 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 [ 53.313591][ T7600] RSP: 002b:00007fff32156718 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 53.321980][ T7600] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440239 [ 53.329929][ T7600] RDX: 0000000000400b60 RSI: 0000000020000200 RDI: 0000000000000c9f [ 53.337875][ T7600] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 53.345821][ T7600] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401ac0 [ 53.353764][ T7600] R13: 0000000000401b50 R14: 0000000000000000 R15: 0000000000000000 [ 53.362884][ T7600] Kernel Offset: disabled [ 53.373886][ T7600] Rebooting in 86400 seconds..