[ 43.276825][ T26] audit: type=1800 audit(1555817043.038:30): pid=7894 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 47.080064][ T26] kauditd_printk_skb: 4 callbacks suppressed [ 47.080079][ T26] audit: type=1400 audit(1555817046.858:35): avc: denied { map } for pid=8068 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 '10.128.1.16' (ECDSA) to the list of known hosts. executing program [ 53.508790][ T26] audit: type=1400 audit(1555817053.288:36): avc: denied { map } for pid=8080 comm="syz-executor462" path="/root/syz-executor462705297" dev="sda1" ino=15902 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 54.641273][ T8101] ------------[ cut here ]------------ [ 54.646907][ T8101] percpu_ref_kill_and_confirm called more than once on io_ring_ctx_ref_free! [ 54.647108][ T8101] WARNING: CPU: 1 PID: 8101 at lib/percpu-refcount.c:335 percpu_ref_kill_and_confirm+0x341/0x3b0 [ 54.666356][ T8101] Kernel panic - not syncing: panic_on_warn set ... [ 54.673213][ T8101] CPU: 1 PID: 8101 Comm: syz-executor462 Not tainted 5.1.0-rc5+ #77 [ 54.681170][ T8101] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.691221][ T8101] Call Trace: [ 54.694506][ T8101] dump_stack+0x172/0x1f0 [ 54.698830][ T8101] ? percpu_ref_kill_and_confirm+0x340/0x3b0 [ 54.704807][ T8101] panic+0x2cb/0x65c [ 54.708735][ T8101] ? __warn_printk+0xf3/0xf3 [ 54.713339][ T8101] ? percpu_ref_kill_and_confirm+0x341/0x3b0 [ 54.719414][ T8101] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.725685][ T8101] ? __warn.cold+0x5/0x45 [ 54.730002][ T8101] ? __warn+0xe8/0x1d0 [ 54.736876][ T8101] ? percpu_ref_kill_and_confirm+0x341/0x3b0 [ 54.742859][ T8101] __warn.cold+0x20/0x45 [ 54.747122][ T8101] ? vprintk_emit+0x1ce/0x6d0 [ 54.751807][ T8101] ? percpu_ref_kill_and_confirm+0x341/0x3b0 [ 54.757797][ T8101] report_bug+0x263/0x2b0 [ 54.762147][ T8101] do_error_trap+0x11b/0x200 [ 54.773782][ T8101] do_invalid_op+0x37/0x50 [ 54.778311][ T8101] ? percpu_ref_kill_and_confirm+0x341/0x3b0 [ 54.784283][ T8101] invalid_op+0x14/0x20 [ 54.788440][ T8101] RIP: 0010:percpu_ref_kill_and_confirm+0x341/0x3b0 [ 54.795050][ T8101] 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 [ 54.814666][ T8101] RSP: 0018:ffff8880a7cd7cf0 EFLAGS: 00010082 [ 54.820725][ T8101] RAX: 0000000000000000 RBX: 0000607f51430dc3 RCX: 0000000000000000 [ 54.828701][ T8101] RDX: 0000000000000000 RSI: ffffffff815afcf6 RDI: ffffed1014f9af90 [ 54.836662][ T8101] RBP: ffff8880a7cd7d20 R08: ffff888098568500 R09: fffffbfff1133639 [ 54.844643][ T8101] R10: fffffbfff1133638 R11: ffffffff8899b1c3 R12: ffff88808b5bd340 [ 54.852602][ T8101] R13: ffff88808b5bd348 R14: 0000000000000286 R15: 0000000000000000 [ 54.860609][ T8101] ? vprintk_func+0x86/0x189 [ 54.865210][ T8101] __io_uring_register+0xa7/0x1fe0 [ 54.870316][ T8101] ? __mutex_lock+0x3cd/0x1310 [ 54.875684][ T8101] ? __x64_sys_io_uring_register+0x182/0x1f0 [ 54.881672][ T8101] ? mutex_trylock+0x1e0/0x1e0 [ 54.886425][ T8101] ? io_sq_wq_submit_work+0x10f0/0x10f0 [ 54.891964][ T8101] ? kasan_check_write+0x14/0x20 [ 54.896914][ T8101] __x64_sys_io_uring_register+0x193/0x1f0 [ 54.902711][ T8101] do_syscall_64+0x103/0x610 [ 54.907284][ T8101] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 54.913187][ T8101] RIP: 0033:0x4467c9 [ 54.923744][ T8101] 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 [ 54.943345][ T8101] RSP: 002b:00007f603d003db8 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab [ 54.951743][ T8101] RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 00000000004467c9 [ 54.960585][ T8101] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000003 [ 54.968549][ T8101] RBP: 00000000006dbc30 R08: 00007f603d004700 R09: 0000000000000000 [ 54.976519][ T8101] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c [ 54.984479][ T8101] R13: 00007fff29888c4f R14: 00007f603d0049c0 R15: 20c49ba5e353f7cf [ 54.993344][ T8101] Kernel Offset: disabled [ 54.997736][ T8101] Rebooting in 86400 seconds..