[....] Starting enhanced syslogd: rsyslogd[ 12.518297] audit: type=1400 audit(1516420472.666:5): avc: denied { syslog } for pid=3505 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[ ok 8[?25h[?0c. [....] 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: [ 18.729008] audit: type=1400 audit(1516420478.876:6): avc: denied { map } for pid=3644 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 '10.128.0.25' (ECDSA) to the list of known hosts. executing program [ 24.946769] audit: type=1400 audit(1516420485.094:7): avc: denied { map } for pid=3658 comm="syzkaller112011" path="/root/syzkaller112011164" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 24.950212] [ 24.974264] ============================================ [ 24.979680] WARNING: possible recursive locking detected [ 24.985100] 4.15.0-rc8-next-20180119+ #102 Not tainted [ 24.990343] -------------------------------------------- [ 24.995758] syzkaller112011/3658 is trying to acquire lock: [ 25.001434] (&vq->mutex){+.+.}, at: [<00000000b42a62df>] vhost_chr_write_iter+0x278/0x1580 [ 25.009901] [ 25.009901] but task is already holding lock: [ 25.015841] (&vq->mutex){+.+.}, at: [<00000000b42a62df>] vhost_chr_write_iter+0x278/0x1580 [ 25.024311] [ 25.024311] other info that might help us debug this: [ 25.031322] Possible unsafe locking scenario: [ 25.031322] [ 25.037347] CPU0 [ 25.039905] ---- [ 25.042456] lock(&vq->mutex); [ 25.045789] lock(&vq->mutex); [ 25.049039] [ 25.049039] *** DEADLOCK *** [ 25.049039] [ 25.055064] May be due to missing lock nesting notation [ 25.055064] [ 25.061963] 1 lock held by syzkaller112011/3658: [ 25.066686] #0: (&vq->mutex){+.+.}, at: [<00000000b42a62df>] vhost_chr_write_iter+0x278/0x1580 [ 25.075591] [ 25.075591] stack backtrace: [ 25.080058] CPU: 0 PID: 3658 Comm: syzkaller112011 Not tainted 4.15.0-rc8-next-20180119+ #102 [ 25.088686] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.098013] Call Trace: [ 25.100586] dump_stack+0x194/0x257 [ 25.104195] ? arch_local_irq_restore+0x53/0x53 [ 25.108842] __lock_acquire+0xe8f/0x3e00 [ 25.112874] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.118037] ? get_kernel_page+0x110/0x110 [ 25.122242] ? __lru_cache_add+0x2a6/0x410 [ 25.126447] ? save_stack+0xa3/0xd0 [ 25.130043] ? print_irqtrace_events+0x270/0x270 [ 25.134768] ? __handle_mm_fault+0x1a0c/0x3ce0 [ 25.139323] ? mem_cgroup_css_online+0x2e0/0x2e0 [ 25.144049] ? check_noncircular+0x20/0x20 [ 25.148251] ? check_noncircular+0x20/0x20 [ 25.152453] ? mark_held_locks+0xaf/0x100 [ 25.156579] lock_acquire+0x1d5/0x580 [ 25.160351] ? lock_acquire+0x1d5/0x580 [ 25.164295] ? vhost_chr_write_iter+0x278/0x1580 [ 25.169031] ? lock_release+0xa40/0xa40 [ 25.172979] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.178841] ? do_raw_spin_trylock+0x190/0x190 [ 25.183394] ? rcu_note_context_switch+0x710/0x710 [ 25.188296] ? __might_sleep+0x95/0x190 [ 25.192240] ? vhost_chr_write_iter+0x278/0x1580 [ 25.196968] __mutex_lock+0x16f/0x1a80 [ 25.200826] ? vhost_chr_write_iter+0x278/0x1580 [ 25.205553] ? vhost_chr_write_iter+0x278/0x1580 [ 25.210281] ? __thp_get_unmapped_area+0x130/0x130 [ 25.215180] ? mutex_lock_io_nested+0x1900/0x1900 [ 25.220018] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.225186] ? find_held_lock+0x35/0x1d0 [ 25.229221] ? __might_fault+0x110/0x1d0 [ 25.233249] ? lock_downgrade+0x980/0x980 [ 25.237365] ? lock_release+0xa40/0xa40 [ 25.241307] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.247164] ? is_bpf_text_address+0x7b/0x120 [ 25.251630] ? __might_sleep+0x95/0x190 [ 25.255573] ? kasan_check_write+0x14/0x20 [ 25.259775] ? copyin+0x91/0xb0 [ 25.263027] ? _copy_from_iter+0x367/0xf30 [ 25.267231] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.271698] ? copy_page_to_iter+0xe00/0xe00 [ 25.276076] ? check_noncircular+0x20/0x20 [ 25.280288] mutex_lock_nested+0x16/0x20 [ 25.284319] ? mutex_lock_nested+0x16/0x20 [ 25.288524] vhost_chr_write_iter+0x278/0x1580 [ 25.293074] ? handle_mm_fault+0x2a0/0x930 [ 25.297278] ? match_held_lock+0x7f3/0x880 [ 25.301483] ? vhost_new_umem_range+0x740/0x740 [ 25.306122] ? __do_page_fault+0x5f7/0xc90 [ 25.310331] vhost_net_chr_write_iter+0x59/0x70 [ 25.314967] __vfs_write+0x684/0x970 [ 25.318658] ? kernel_read+0x120/0x120 [ 25.322514] ? _cond_resched+0x14/0x30 [ 25.326370] ? avc_policy_seqno+0x9/0x20 [ 25.330398] ? selinux_file_permission+0x82/0x460 [ 25.335209] ? rw_verify_area+0xe5/0x2b0 [ 25.339237] ? __fdget_raw+0x20/0x20 [ 25.342925] vfs_write+0x189/0x510 [ 25.346435] SyS_write+0xef/0x220 [ 25.349854] ? filp_open+0x70/0x70 [ 25.353362] ? SyS_read+0x220/0x220 [ 25.356958] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.361944] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.366684] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 25.371411] RIP: 0033:0x43fd79 [ 25.374573] RSP: 002b:00007ffca9b7b078 EFLAGS: 00000203 ORIG_RAX: 0000000000000001 [ 25.382252] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd79 [ 25.389495] RDX: 0000000000000068 RSI: 00000000209e6f98 RDI: 0000000000000003 [ 25.396741] RBP: 000