[....] Starting enhanced syslogd: rsyslogd[ 12.145686] audit: type=1400 audit(1519869877.232:4): avc: denied { syslog } for pid=3467 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 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.755431] IPVS: Creating netns size=2536 id=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 26.022006] ------------[ cut here ]------------ [ 26.026778] WARNING: CPU: 0 PID: 3841 at kernel/locking/lockdep.c:704 register_lock_class+0xcac/0x1340 [ 26.036188] Kernel panic - not syncing: panic_on_warn set ... [ 26.036188] [ 26.043520] CPU: 0 PID: 3841 Comm: syzkaller100826 Not tainted 4.9.85-g6e463bb #46 [ 26.051196] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.060521] ffff8801bf54f4f8 ffffffff81d955d9 ffffffff83a480c0 ffff8801bf54f5d0 [ 26.068486] ffffffff83a5b900 ffffffff81236cfc 0000000000000009 ffff8801bf54f5c0 [ 26.076487] ffffffff8142f571 0000000041b58ab3 ffffffff8418b388 ffffffff8142f3b5 [ 26.084465] Call Trace: [ 26.087025] [] dump_stack+0xc1/0x128 [ 26.092356] [] ? register_lock_class+0xcac/0x1340 [ 26.098815] [] panic+0x1bc/0x3a8 [ 26.103799] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 26.111995] [] ? load_image_and_restore+0xf9/0xf9 [ 26.118457] [] ? __warn+0x1a9/0x1e0 [ 26.123702] [] ? register_lock_class+0xcac/0x1340 [ 26.130161] [] __warn+0x1c4/0x1e0 [ 26.135238] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 26.142222] [] warn_slowpath_null+0x2c/0x40 [ 26.148168] [] register_lock_class+0xcac/0x1340 [ 26.154454] [] __lock_acquire+0x16c/0x3640 [ 26.160308] [] ? check_preemption_disabled+0x3b/0x200 [ 26.167117] [] ? check_preemption_disabled+0x3b/0x200 [ 26.173930] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 26.180913] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 26.187900] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 26.194712] [] ? _raw_spin_unlock_irq+0x38/0x50 [ 26.201006] [] ? finish_task_switch+0x1ed/0x630 [ 26.207293] [] ? finish_task_switch+0x1c1/0x630 [ 26.213583] [] ? __schedule+0x64d/0x1ba0 [ 26.219266] [] lock_acquire+0x12e/0x410 [ 26.224862] [] ? lock_sock_nested+0x43/0x120 [ 26.230889] [] _raw_spin_lock_bh+0x3a/0x50 [ 26.236745] [] ? lock_sock_nested+0x43/0x120 [ 26.242773] [] lock_sock_nested+0x43/0x120 [ 26.248631] [] ? __might_fault+0x18e/0x1d0 [ 26.254493] [] do_ip_getsockopt+0x16a/0x15f0 [ 26.260520] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 26.267329] [] ? ip_ra_destroy_rcu+0x70/0x70 [ 26.273356] [] ? drop_futex_key_refs.isra.11+0x63/0xd0 [ 26.280260] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 26.287246] [] ? futex_wait_setup+0x330/0x330 [ 26.293361] [] ? __lock_acquire+0x629/0x3640 [ 26.299393] [] ? check_preemption_disabled+0x3b/0x200 [ 26.306208] [] ? avc_has_perm+0x28b/0x4f0 [ 26.311973] [] ? avc_has_perm+0x2fd/0x4f0 [ 26.317739] [] ? avc_has_perm+0xb0/0x4f0 [ 26.323416] [] ? avc_has_perm_noaudit+0x450/0x450 [ 26.329880] [] ? check_preemption_disabled+0x3b/0x200 [ 26.336687] [] ? sock_has_perm+0x1c2/0x3e0 [ 26.342538] [] ? sock_has_perm+0x292/0x3e0 [ 26.348389] [] ? sock_has_perm+0x9f/0x3e0 [ 26.354159] [] ip_getsockopt+0x8f/0x180 [ 26.359752] [] ? do_ip_getsockopt+0x15f0/0x15f0 [ 26.366041] [] ? __fget+0x231/0x3b0 [ 26.371286] [] udp_getsockopt+0x45/0x80 [ 26.376880] [] sock_common_getsockopt+0x95/0xd0 [ 26.383167] [] SyS_getsockopt+0x14a/0x230 [ 26.388933] [] ? SyS_setsockopt+0x250/0x250 [ 26.394874] [] ? __do_page_fault+0x3bd/0xd40 [ 26.400901] [] ? do_syscall_64+0x48/0x490 [ 26.406668] [] ? SyS_setsockopt+0x250/0x250 [ 26.412608] [] do_syscall_64+0x1a4/0x490 [ 26.418286] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.425519] Dumping ftrace buffer: [ 26.429025] (ftrace buffer empty) [ 26.432704] Kernel Offset: disabled [ 26.436299] Rebooting in 86400 seconds..