[....] Starting enhanced syslogd: rsyslogd[ 14.094670] audit: type=1400 audit(1572448508.457:4): avc: denied { syslog } for pid=1926 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.56' (ECDSA) to the list of known hosts. 2019/10/30 15:15:45 parsed 1 programs 2019/10/30 15:15:48 executed programs: 0 syzkaller login: [ 56.176662] ------------[ cut here ]------------ [ 56.181515] WARNING: CPU: 1 PID: 2295 at fs/ext4/inode.c:3327 ext4_direct_IO+0x226d/0x2a80() [ 56.190297] Kernel panic - not syncing: panic_on_warn set ... [ 56.190297] [ 56.197659] CPU: 1 PID: 2295 Comm: syz-executor.0 Not tainted 4.4.174+ #17 [ 56.204745] 0000000000000000 5a2d668a5386e855 ffff8801d1e5f4e8 ffffffff81aad1a1 [ 56.214177] 0000000000000000 ffffffff82835ee0 ffffffff828bfa40 0000000000000cff [ 56.222183] ffffffff816417cd ffff8801d1e5f5c8 ffffffff813a48c2 0000000041b58ab3 [ 56.230212] Call Trace: [ 56.232790] [] dump_stack+0xc1/0x120 [ 56.238141] [] ? ext4_direct_IO+0x226d/0x2a80 [ 56.244370] [] panic+0x1b9/0x37b [ 56.249402] [] ? add_taint.cold+0x16/0x16 [ 56.255199] [] ? warn_slowpath_common.cold+0x5/0x20 [ 56.261865] [] warn_slowpath_common.cold+0x20/0x20 [ 56.269384] [] warn_slowpath_null+0x2a/0x30 [ 56.275338] [] ext4_direct_IO+0x226d/0x2a80 [ 56.281301] [] ? ext4_update_bh_state+0xf0/0xf0 [ 56.287603] [] ? ext4_end_io_dio+0xc0/0xc0 [ 56.293473] [] ? trace_hardirqs_on+0x10/0x10 [ 56.299529] [] ? trace_hardirqs_on+0x10/0x10 [ 56.305574] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 56.312310] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 56.319066] [] ? mark_held_locks+0xb1/0x100 [ 56.325020] [] ? filemap_check_errors+0x9d/0xe0 [ 56.331338] [] generic_file_direct_write+0x276/0x4f0 [ 56.338073] [] ? current_fs_time+0x18/0x70 [ 56.343939] [] ? filemap_write_and_wait_range+0xb0/0xb0 [ 56.351038] [] ? file_update_time+0xc1/0x3c0 [ 56.357102] [] ? mutex_trylock+0x500/0x500 [ 56.363102] [] __generic_file_write_iter+0x245/0x540 [ 56.369840] [] ext4_file_write_iter+0x9ec/0xc70 [ 56.376155] [] ? depot_save_stack+0x1c3/0x5f0 [ 56.382296] [] ? ext4_unwritten_wait+0x200/0x200 [ 56.389231] [] ? check_preemption_disabled+0x3c/0x200 [ 56.396070] [] ? check_preemption_disabled+0x3c/0x200 [ 56.402910] [] ? rcu_read_lock_sched_held+0x10b/0x130 [ 56.409777] [] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 56.416355] [] ? aio_run_iocb+0x682/0x6f0 [ 56.422150] [] aio_run_iocb+0x4ff/0x6f0 [ 56.427768] [] ? ext4_unwritten_wait+0x200/0x200 [ 56.434151] [] ? aio_complete+0xb90/0xb90 [ 56.439958] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 56.446708] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 56.453539] [] ? __might_fault+0x117/0x1d0 [ 56.459410] [] do_io_submit+0x639/0xf10 [ 56.465022] [] ? do_io_submit+0x2d2/0xf10 [ 56.470804] [] ? trace_hardirqs_on+0x10/0x10 [ 56.476854] [] ? SyS_io_destroy+0x350/0x350 [ 56.482804] [] compat_SyS_io_submit+0xe4/0x140 [ 56.489015] [] ? compat_rw_copy_check_uvector+0x370/0x370 [ 56.496184] [] do_fast_syscall_32+0x32d/0xa90 [ 56.502577] [] sysenter_flags_fixed+0xd/0x1a [ 56.509552] Kernel Offset: disabled [ 56.513212] Rebooting in 86400 seconds..