[....] Starting enhanced syslogd: rsyslogd[ 13.034129] audit: type=1400 audit(1517094784.380:5): avc: denied { syslog } for pid=3527 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: [ 18.266916] audit: type=1400 audit(1517094789.613:6): avc: denied { map } for pid=3666 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 '10.128.0.6' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 24.564470] audit: type=1400 audit(1517094795.911:7): avc: denied { map } for pid=3681 comm="syzkaller921809" path="/root/syzkaller921809371" 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 RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 24.954511] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument executing program [ 25.291996] [ 25.293673] ====================================================== [ 25.299958] WARNING: possible circular locking dependency detected [ 25.306245] 4.15.0-rc9+ #212 Not tainted [ 25.310272] ------------------------------------------------------ [ 25.316590] syzkaller921809/3681 is trying to acquire lock: [ 25.322842] (rtnl_mutex){+.+.}, at: [<0000000025b2648b>] rtnl_lock+0x17/0x20 [ 25.330102] [ 25.330102] but task is already holding lock: [ 25.336043] (sk_lock-AF_INET){+.+.}, at: [<000000000e3a5bd8>] ip_setsockopt+0x8c/0xb0 [ 25.344074] [ 25.344074] which lock already depends on the new lock. [ 25.344074] [ 25.352356] [ 25.352356] the existing dependency chain (in reverse order) is: [ 25.359945] [ 25.359945] -> #1 (sk_lock-AF_INET){+.+.}: [ 25.365634] lock_sock_nested+0xc2/0x110 [ 25.370184] do_ip_setsockopt.isra.12+0x1d9/0x3210 [ 25.375603] ip_setsockopt+0x3a/0xb0 [ 25.379807] dccp_setsockopt+0x85/0xd0 [ 25.384186] sock_common_setsockopt+0x95/0xd0 [ 25.389176] SyS_setsockopt+0x189/0x360 [ 25.393640] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 25.398882] [ 25.398882] -> #0 (rtnl_mutex){+.+.}: [ 25.404137] lock_acquire+0x1d5/0x580 [ 25.408425] __mutex_lock+0x16f/0x1a80 [ 25.412813] mutex_lock_nested+0x16/0x20 [ 25.417366] rtnl_lock+0x17/0x20 [ 25.421223] register_netdevice_notifier+0xad/0x860 [ 25.426827] tee_tg_check+0x1a0/0x280 [ 25.431120] xt_check_target+0x22c/0x7d0 [ 25.435673] find_check_entry.isra.8+0x8c8/0xcb0 [ 25.440919] translate_table+0xed1/0x1610 [ 25.445560] do_ipt_set_ctl+0x370/0x5f0 [ 25.450030] nf_setsockopt+0x67/0xc0 [ 25.454235] ip_setsockopt+0xa1/0xb0 [ 25.458438] raw_setsockopt+0xb7/0xd0 [ 25.462732] sock_common_setsockopt+0x95/0xd0 [ 25.467719] SyS_setsockopt+0x189/0x360 [ 25.472185] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 25.477428] [ 25.477428] other info that might help us debug this: [ 25.477428] [ 25.485537] Possible unsafe locking scenario: [ 25.485537] [ 25.491561] CPU0 CPU1 [ 25.496197] ---- ---- [ 25.500831] lock(sk_lock-AF_INET); [ 25.504513] lock(rtnl_mutex); [ 25.510282] lock(sk_lock-AF_INET); [ 25.516483] lock(rtnl_mutex); [ 25.519731] [ 25.519731] *** DEADLOCK *** [ 25.519731] [ 25.525770] 1 lock held by syzkaller921809/3681: [ 25.530492] #0: (sk_lock-AF_INET){+.+.}, at: [<000000000e3a5bd8>] ip_setsockopt+0x8c/0xb0 [ 25.538957] [ 25.538957] stack backtrace: [ 25.543424] CPU: 0 PID: 3681 Comm: syzkaller921809 Not tainted 4.15.0-rc9+ #212 [ 25.550837] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.560159] Call Trace: [ 25.562721] dump_stack+0x194/0x257 [ 25.566320] ? arch_local_irq_restore+0x53/0x53 [ 25.570965] print_circular_bug.isra.37+0x2cd/0x2dc [ 25.575949] ? save_trace+0xe0/0x2b0 [ 25.579634] __lock_acquire+0x30a8/0x3e00 [ 25.583751] ? print_irqtrace_events+0x270/0x270 [ 25.588479] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.593636] ? check_noncircular+0x20/0x20 [ 25.597841] ? print_irqtrace_events+0x270/0x270 [ 25.602567] ? __lock_acquire+0x664/0x3e00 [ 25.606772] ? __debug_object_init+0x235/0x1040 [ 25.611411] ? lock_downgrade+0x980/0x980 [ 25.615528] ? print_irqtrace_events+0x270/0x270 [ 25.620258] ? __lock_acquire+0x664/0x3e00 [ 25.624465] ? debug_object_activate+0x307/0x730 [ 25.629194] ? check_noncircular+0x20/0x20 [ 25.633409] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.638571] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.643733] lock_acquire+0x1d5/0x580 [ 25.647502] ? lock_acquire+0x1d5/0x580 [ 25.651446] ? rtnl_lock+0x17/0x20 [ 25.654956] ? lock_release+0xa40/0xa40 [ 25.658901] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.664758] ? rcu_note_context_switch+0x710/0x710 [ 25.669667] ? __might_sleep+0x95/0x190 [ 25.673618] ? rtnl_lock+0x17/0x20 [ 25.677131] __mutex_lock+0x16f/0x1a80 [ 25.680991] ? rtnl_lock+0x17/0x20 [ 25.684515] ? lock_downgrade+0x980/0x980 [ 25.688633] ? rtnl_lock+0x17/0x20 [ 25.692143] ? mutex_lock_io_nested+0x1900/0x1900 [ 25.696961] ? is_bpf_text_address+0x7b/0x120 [ 25.701427] ? print_irqtrace_events+0x270/0x270 [ 25.706155] ? depot_save_stack+0x3b5/0x490 [ 25.710448] ? lock_downgrade+0x980/0x980 [ 25.714568] ? lock_release+0xa40/0xa40 [ 25.718513] ? mark_held_locks+0xaf/0x100 [ 25.722633] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 25.727704] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.732700] ? trace_hardirqs_on+0xd/0x10 [ 25.736818] ? depot_save_stack+0x3b5/0x490 [ 25.741112] ? save_stack+0xa3/0xd0 [ 25.744708] ? save_stack+0x43/0xd0 [ 25.748304] ? kasan_kmalloc+0xad/0xe0 [ 25.752184] ? kmem_cache_alloc_trace+0x136/0x750 [ 25.756999] ? tee_tg_check+0xed/0x280 [ 25.760862] ? xt_check_target+0x22c/0x7d0 [ 25.765068] ? find_check_entry.isra.8+0x8c8/0xcb0 [ 25.769969] ? translate_table+0xed1/0x1610 [ 25.774263] ? do_ipt_set_ctl+0x370/0x5f0 [ 25.778380] ? nf_setsockopt+0x67/0xc0 [ 25.782237] ? ip_setsockopt+0xa1/0xb0 [ 25.786096] ? raw_setsockopt+0xb7/0xd0 [ 25.790047] ? sock_common_setsockopt+0x95/0xd0 [ 25.794684] ? SyS_setsockopt+0x189/0x360 [ 25.798803] ? entry_SYSCALL_64_fastpath+0x29/0xa0 [ 25.803706] mutex_lock_nested+0x16/0x20 [ 25.807737] ? mutex_lock_nested+0x16/0x20 [ 25.811945] rtnl_lock+0x17/0x20 [ 25.815283] register_netdevice_notifier+0xad/0x860 [ 25.820272] ? __dev_close_many+0x350/0x350 [ 25.824565] ? __lock_is_held+0xb6/0x140 [ 25.828596] ? tee_tg_check+0xed/0x280 [ 25.832455] ? rcu_read_lock_sched_held+0x108/0x120 [ 25.837459] ? kmem_cache_alloc_trace+0x456/0x750 [ 25.842274] ? __kernel_text_address+0xd/0x40 [ 25.846739] ? wait_for_completion+0x770/0x770 [ 25.851295] tee_tg_check+0x1a0/0x280 [ 25.855068] ? tee_tg4+0x170/0x170 [ 25.858580] xt_check_target+0x22c/0x7d0 [ 25.862614] ? xt_target_seq_next+0x30/0x30 [ 25.866913] ? save_stack+0xa3/0xd0 [ 25.870513] ? kasan_slab_free+0x71/0xc0 [ 25.874545] ? kfree+0xd6/0x260 [ 25.877797] ? kvfree+0x36/0x60 [ 25.881053] ? mutex_unlock+0xd/0x10 [ 25.884738] ? xt_find_target+0x17b/0x1e0 [ 25.888870] find_check_entry.isra.8+0x8c8/0xcb0 [ 25.893598] ? ipt_do_table+0x1860/0x1860 [ 25.897717] ? mark_held_locks+0xaf/0x100 [ 25.901838] ? kfree+0xf0/0x260 [ 25.905088] ? trace_hardirqs_on+0xd/0x10 [ 25.909219] translate_table+0xed1/0x1610 [ 25.913350] ? alloc_counters.isra.11+0x7d0/0x7d0 [ 25.918165] ? kasan_check_write+0x14/0x20 [ 25.922371] ? _copy_from_user+0x99/0x110 [ 25.926489] do_ipt_set_ctl+0x370/0x5f0 [ 25.930431] ? translate_compat_table+0x1b90/0x1b90 [ 25.935419] ? mutex_unlock+0xd/0x10 [ 25.939105] ? nf_sockopt_find.constprop.0+0x1a7/0x220 [ 25.944349] nf_setsockopt+0x67/0xc0 [ 25.948037] ip_setsockopt+0xa1/0xb0 [ 25.951721] raw_setsockopt+0xb7/0xd0 [ 25.955494] sock_common_setsockopt+0x95/0xd0 [ 25.959957] SyS_setsockopt+0x189/0x360 [ 25.963905] ? SyS_recv+0x40/0x40 [ 25.967329] ? entry_SYSCALL_64_fastpath+0x5/0xa0 [ 25.972142] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.977134] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.981858] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 25.986585] RIP: 0033:0x4459e9 [ 25.989757] RSP: 002b:00007ffe124ae598 EFLAGS: 00000203 O