[....] Starting enhanced syslogd: rsyslogd[ 13.108272] audit: type=1400 audit(1537020409.087:4): avc: denied { syslog } for pid=1916 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[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 50.550047] ------------[ cut here ]------------ [ 50.554911] WARNING: CPU: 0 PID: 2085 at fs/ext4/inode.c:3327 ext4_direct_IO+0x22bc/0x2a60() [ 50.563545] Kernel panic - not syncing: panic_on_warn set ... [ 50.563545] [ 50.570894] CPU: 0 PID: 2085 Comm: syz-executor028 Not tainted 4.4.156+ #35 [ 50.577973] 0000000000000000 e3853cd986355ce0 ffff8800b6b77500 ffffffff81a557bd [ 50.585965] ffffffff82835440 ffff8800b68297c0 ffffffff828beb80 0000000000000009 [ 50.593988] 0000000000000cff ffff8800b6b775c0 ffffffff8138af34 0000000041b58ab3 [ 50.601979] Call Trace: [ 50.604552] [] dump_stack+0xc1/0x124 [ 50.609906] [] panic+0x19e/0x359 [ 50.614910] [] ? add_taint.cold.4+0x16/0x16 [ 50.620861] [] ? warn_slowpath_common.cold.6+0x5/0x20 [ 50.627679] [] warn_slowpath_common.cold.6+0x20/0x20 [ 50.634413] [] ? ext4_direct_IO+0x22bc/0x2a60 [ 50.640555] [] warn_slowpath_null+0x29/0x30 [ 50.646509] [] ext4_direct_IO+0x22bc/0x2a60 [ 50.652465] [] ? ext4_update_bh_state+0xf0/0xf0 [ 50.658766] [] ? ext4_end_io_dio+0xc0/0xc0 [ 50.664629] [] ? jbd2_buffer_abort_trigger+0x90/0x90 [ 50.671483] [] ? ext4_mark_inode_dirty+0x3f7/0xb80 [ 50.678049] [] ? rcu_read_lock_sched_held+0x103/0x120 [ 50.684890] [] ? check_preemption_disabled+0x3b/0x170 [ 50.691712] [] ? ext4_setattr+0x2080/0x2080 [ 50.697706] [] ? ext4_setattr+0x2080/0x2080 [ 50.703669] [] ? rcu_read_lock_sched_held+0x103/0x120 [ 50.710532] [] ? filemap_check_errors+0x9d/0xe0 [ 50.716847] [] generic_file_direct_write+0x267/0x4e0 [ 50.723587] [] ? filemap_write_and_wait_range+0xb0/0xb0 [ 50.730600] [] ? mutex_trylock+0x3e0/0x3e0 [ 50.736617] [] __generic_file_write_iter+0x254/0x550 [ 50.743358] [] ext4_file_write_iter+0x966/0xc80 [ 50.749738] [] ? file_has_perm+0x198/0x310 [ 50.755958] [] ? ext4_unwritten_wait+0x1f0/0x1f0 [ 50.762343] [] ? check_preemption_disabled+0x3b/0x170 [ 50.769172] [] ? rcu_read_lock_sched_held+0x103/0x120 [ 50.776006] [] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 50.782767] [] ? aio_run_iocb+0x688/0x700 [ 50.788554] [] aio_run_iocb+0x511/0x700 [ 50.794158] [] ? ext4_unwritten_wait+0x1f0/0x1f0 [ 50.800552] [] ? aio_complete+0x9e0/0x9e0 [ 50.806334] [] ? trace_hardirqs_on+0x10/0x10 [ 50.812375] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 50.819117] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 50.825865] [] ? __might_fault+0x114/0x1d0 [ 50.831733] [] do_io_submit+0x5b7/0xe50 [ 50.837458] [] ? do_io_submit+0x2b9/0xe50 [ 50.843243] [] ? SyS_io_destroy+0x340/0x340 [ 50.849202] [] compat_SyS_io_submit+0xe3/0x130 [ 50.855430] [] ? compat_rw_copy_check_uvector+0x380/0x380 [ 50.862611] [] do_fast_syscall_32+0x31e/0x8b0 [ 50.868756] [] sysenter_flags_fixed+0xd/0x1a [ 50.875108] Kernel Offset: disabled [ 50.878746] Rebooting in 86400 seconds..