[ 34.546460][ T26] audit: type=1800 audit(1555119101.318:27): pid=7359 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 34.570322][ T26] audit: type=1800 audit(1555119101.328:28): pid=7359 uid=0 auid=4294967295 ses=4294967295 subj==unconfined 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. [ 35.431313][ T26] audit: type=1800 audit(1555119102.258:29): pid=7359 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 35.452029][ T26] audit: type=1800 audit(1555119102.258:30): pid=7359 uid=0 auid=4294967295 ses=4294967295 subj==unconfined 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 '10.128.15.198' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 59.837113][ T7511] WARNING: CPU: 1 PID: 7511 at include/linux/cpumask.h:121 io_uring_setup+0x13b2/0x1990 [ 59.847001][ T7511] Kernel panic - not syncing: panic_on_warn set ... [ 59.853583][ T7511] CPU: 1 PID: 7511 Comm: syz-executor351 Not tainted 5.1.0-rc4-next-20190412 #24 [ 59.862680][ T7511] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.872735][ T7511] Call Trace: [ 59.876030][ T7511] dump_stack+0x172/0x1f0 [ 59.880349][ T7511] ? io_uring_setup+0x13a0/0x1990 [ 59.885438][ T7511] panic+0x2cb/0x72b [ 59.889447][ T7511] ? __warn_printk+0xf3/0xf3 [ 59.894054][ T7511] ? io_uring_setup+0x13b2/0x1990 [ 59.899067][ T7511] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 59.905383][ T7511] ? __warn.cold+0x5/0x46 [ 59.909720][ T7511] ? __warn+0xe8/0x1d0 [ 59.913775][ T7511] ? io_uring_setup+0x13b2/0x1990 [ 59.918800][ T7511] __warn.cold+0x20/0x46 [ 59.923107][ T7511] ? io_uring_setup+0x13b2/0x1990 [ 59.928238][ T7511] report_bug+0x263/0x2b0 [ 59.932558][ T7511] do_error_trap+0x11b/0x200 [ 59.937248][ T7511] do_invalid_op+0x37/0x50 [ 59.941648][ T7511] ? io_uring_setup+0x13b2/0x1990 [ 59.946656][ T7511] invalid_op+0x14/0x20 [ 59.950854][ T7511] RIP: 0010:io_uring_setup+0x13b2/0x1990 [ 59.956491][ T7511] 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 88 60 e0 ff e9 0b fe ff ff e8 de 56 a7 ff <0f> 0b e9 db f8 ff ff e8 d2 56 a7 ff 49 8d 9c 24 88 00 00 00 48 b8 [ 59.976193][ T7511] RSP: 0018:ffff888090b8fdc0 EFLAGS: 00010293 [ 59.982242][ T7511] RAX: ffff888088260340 RBX: 0000000000000406 RCX: ffffffff81c92aeb [ 59.990469][ T7511] RDX: 0000000000000000 RSI: ffffffff81c93212 RDI: 0000000000000005 [ 59.998486][ T7511] RBP: ffff888090b8fef0 R08: ffff888088260340 R09: ffffed1012da7a0c [ 60.006581][ T7511] R10: ffffed1012da7a0b R11: ffff888096d3d05f R12: ffff8880917e1640 [ 60.014551][ T7511] R13: ffff888090b8fec8 R14: ffff8880917e1680 R15: ffff8880917e1694 [ 60.022738][ T7511] ? io_uring_setup+0xc8b/0x1990 [ 60.027669][ T7511] ? io_uring_setup+0x13b2/0x1990 [ 60.032744][ T7511] ? io_uring_release+0x50/0x50 [ 60.037601][ T7511] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 60.043050][ T7511] ? do_syscall_64+0x26/0x610 [ 60.047788][ T7511] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 60.053866][ T7511] ? do_syscall_64+0x26/0x610 [ 60.058545][ T7511] ? lockdep_hardirqs_on+0x418/0x5d0 [ 60.063896][ T7511] __x64_sys_io_uring_setup+0x54/0x80 [ 60.069276][ T7511] do_syscall_64+0x103/0x610 [ 60.073914][ T7511] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 60.079802][ T7511] RIP: 0033:0x440239 [ 60.083684][ T7511] 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 [ 60.103289][ T7511] RSP: 002b:00007fff1fe29e18 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 60.111699][ T7511] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440239 [ 60.119747][ T7511] RDX: 0000000000400b60 RSI: 0000000020000140 RDI: 000000000000089e [ 60.127760][ T7511] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 60.135775][ T7511] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401ac0 [ 60.143751][ T7511] R13: 0000000000401b50 R14: 0000000000000000 R15: 0000000000000000 [ 60.152733][ T7511] Kernel Offset: disabled [ 60.157194][ T7511] Rebooting in 86400 seconds..