Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] startpar: service(s) returned failure: ssh ...[?25l[?1c7[FAIL8[?25h[?0c failed! Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 50.327322][ T26] kauditd_printk_skb: 4 callbacks suppressed [ 50.327338][ T26] audit: type=1400 audit(1555809657.962:35): avc: denied { map } for pid=8369 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.216' (ECDSA) to the list of known hosts. executing program [ 56.813790][ T26] audit: type=1400 audit(1555809664.452:36): avc: denied { map } for pid=8381 comm="syz-executor654" path="/root/syz-executor654497824" dev="sda1" ino=15903 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 56.888455][ T8384] ------------[ cut here ]------------ [ 56.894074][ T8384] percpu_ref_kill_and_confirm called more than once on io_ring_ctx_ref_free! [ 56.894284][ T8384] WARNING: CPU: 0 PID: 8384 at lib/percpu-refcount.c:335 percpu_ref_kill_and_confirm+0x341/0x3b0 [ 56.913553][ T8384] Kernel panic - not syncing: panic_on_warn set ... [ 56.920135][ T8384] CPU: 0 PID: 8384 Comm: syz-executor654 Not tainted 5.1.0-rc5+ #77 [ 56.928111][ T8384] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.938180][ T8384] Call Trace: [ 56.941469][ T8384] dump_stack+0x172/0x1f0 [ 56.945824][ T8384] ? percpu_ref_kill_and_confirm+0x340/0x3b0 [ 56.952095][ T8384] panic+0x2cb/0x65c [ 56.956009][ T8384] ? __warn_printk+0xf3/0xf3 [ 56.960626][ T8384] ? percpu_ref_kill_and_confirm+0x341/0x3b0 [ 56.966624][ T8384] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 56.972858][ T8384] ? __warn.cold+0x5/0x45 [ 56.977196][ T8384] ? __warn+0xe8/0x1d0 [ 56.981277][ T8384] ? percpu_ref_kill_and_confirm+0x341/0x3b0 [ 56.987280][ T8384] __warn.cold+0x20/0x45 [ 56.991528][ T8384] ? vprintk_emit+0x1ce/0x6d0 [ 56.996768][ T8384] ? percpu_ref_kill_and_confirm+0x341/0x3b0 [ 57.004210][ T8384] report_bug+0x263/0x2b0 [ 57.009005][ T8384] do_error_trap+0x11b/0x200 [ 57.013639][ T8384] do_invalid_op+0x37/0x50 [ 57.018180][ T8384] ? percpu_ref_kill_and_confirm+0x341/0x3b0 [ 57.024164][ T8384] invalid_op+0x14/0x20 [ 57.028310][ T8384] RIP: 0010:percpu_ref_kill_and_confirm+0x341/0x3b0 [ 57.034924][ T8384] Code: 42 e0 2a 06 01 48 89 fa 48 c1 ea 03 80 3c 02 00 75 76 49 8b 54 24 10 48 c7 c6 a0 71 a1 87 48 c7 c7 40 71 a1 87 e8 ad 92 13 fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 57.055067][ T8384] RSP: 0018:ffff88809df8fcf0 EFLAGS: 00010082 [ 57.061140][ T8384] RAX: 0000000000000000 RBX: 0000607f51431c03 RCX: 0000000000000000 [ 57.069247][ T8384] RDX: 0000000000000000 RSI: ffffffff815afcf6 RDI: ffffed1013bf1f90 [ 57.077211][ T8384] RBP: ffff88809df8fd20 R08: ffff8880910fa440 R09: fffffbfff1133639 [ 57.085475][ T8384] R10: fffffbfff1133638 R11: ffffffff8899b1c3 R12: ffff88809835c8c0 [ 57.093620][ T8384] R13: ffff88809835c8c8 R14: 0000000000000286 R15: 0000000000000000 [ 57.106139][ T8384] ? vprintk_func+0x86/0x189 [ 57.110764][ T8384] __io_uring_register+0xa7/0x1fe0 [ 57.115888][ T8384] ? __mutex_lock+0x3cd/0x1310 [ 57.120910][ T8384] ? __x64_sys_io_uring_register+0x182/0x1f0 [ 57.126888][ T8384] ? mutex_trylock+0x1e0/0x1e0 [ 57.131655][ T8384] ? io_sq_wq_submit_work+0x10f0/0x10f0 [ 57.137228][ T8384] ? kasan_check_write+0x14/0x20 [ 57.142165][ T8384] __x64_sys_io_uring_register+0x193/0x1f0 [ 57.148094][ T8384] do_syscall_64+0x103/0x610 [ 57.152694][ T8384] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 57.158607][ T8384] RIP: 0033:0x446799 [ 57.162508][ T8384] Code: e8 5c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 57.182130][ T8384] RSP: 002b:00007f62204f2db8 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab [ 57.190536][ T8384] RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000446799 [ 57.198889][ T8384] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 57.209881][ T8384] RBP: 00000000006dbc30 R08: 00007f62204f3700 R09: 0000000000000000 [ 57.218929][ T8384] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c [ 57.226909][ T8384] R13: 00007ffd41aebc7f R14: 00007f62204f39c0 R15: 20c49ba5e353f7cf [ 57.235845][ T8384] Kernel Offset: disabled [ 57.242832][ T8384] Rebooting in 86400 seconds..