[....] Starting enhanced syslogd: rsyslogd[ 12.235256] audit: type=1400 audit(1566023873.366:4): avc: denied { syslog } for pid=1908 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 periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] 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 '10.128.0.31' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 22.044008] kasan: CONFIG_KASAN_INLINE enabled [ 22.049663] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 22.062529] Modules linked in: [ 22.065810] CPU: 0 PID: 2055 Comm: syz-executor342 Not tainted 4.4.174+ #17 [ 22.072876] task: ffff8801d57ec740 task.stack: ffff8801d4930000 [ 22.078900] RIP: 0010:[] [] __blockdev_direct_IO+0x36ea/0xb030 [ 22.088184] RSP: 0018:ffff8801d4937200 EFLAGS: 00010202 [ 22.093602] RAX: 0000000000000004 RBX: dffffc0000000000 RCX: 000000000000000c [ 22.100848] RDX: 0000000000000000 RSI: ffffffff81557477 RDI: 0000000000000020 [ 22.108093] RBP: ffff8801d4937518 R08: 1ffff1003b0cacc0 R09: ffff8801d8656600 [ 22.115337] R10: ffffed003b0cacce R11: ffff8801d8656677 R12: ffffea0007523400 [ 22.122578] R13: ffff8801d8656600 R14: ffff8801da266780 R15: ffff8801d4ea8000 [ 22.129820] FS: 0000000000000000(0000) GS:ffff8801db600000(0063) knlGS:0000000008266840 [ 22.138014] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 22.143868] CR2: 000000002001147f CR3: 00000001d569c000 CR4: 00000000001606b0 [ 22.151115] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 22.158354] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 22.165592] Stack: [ 22.167712] fffffbfff05c2202 ffff8801d4937310 0005080000000000 0000000000001000 [ 22.175708] 0000000000008220 ffff8801d4ea8079 0000000041b58ab3 0000000000011000 [ 22.183692] ffff8801d4937360 00001000d57ed000 fffffffffffff000 0000000000000fff [ 22.191932] Call Trace: [ 22.194494] [] ? sb_init_dio_done_wq+0x80/0x80 [ 22.200698] [] ? check_preemption_disabled+0x3c/0x200 [ 22.207509] [] ? check_preemption_disabled+0x3c/0x200 [ 22.214324] [] ? _ext4_get_block+0x690/0x690 [ 22.220357] [] ? ext4_ind_direct_IO+0x6dc/0xb90 [ 22.226650] [] ? ext4_journal_check_start+0x116/0x1a0 [ 22.233466] [] ? __ext4_journal_start_sb+0x13e/0x510 [ 22.240193] [] ext4_ind_direct_IO+0x3e1/0xb90 [ 22.246312] [] ? ext4_ind_map_blocks+0x21f0/0x21f0 [ 22.252861] [] ext4_direct_IO+0x8c1/0x2a80 [ 22.258721] [] ? __lock_acquire+0x22e3/0x4f50 [ 22.264836] [] ? ext4_end_io_dio+0xc0/0xc0 [ 22.270690] [] ? trace_hardirqs_on+0x10/0x10 [ 22.276721] [] ? ext4_xattr_security_get+0x85/0xb0 [ 22.283271] [] ? generic_getxattr+0x128/0x1a0 [ 22.289386] [] ? xattr_resolve_name+0x1f0/0x1f0 [ 22.295676] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 22.302400] [] ? mark_held_locks+0xb1/0x100 [ 22.308344] [] ? filemap_check_errors+0x9d/0xe0 [ 22.314684] [] generic_file_direct_write+0x276/0x4f0 [ 22.321408] [] ? current_fs_time+0x18/0x70 [ 22.327272] [] ? filemap_write_and_wait_range+0xb0/0xb0 [ 22.334262] [] ? file_update_time+0xc1/0x3c0 [ 22.340310] [] ? mutex_trylock+0x500/0x500 [ 22.346175] [] __generic_file_write_iter+0x245/0x540 [ 22.352902] [] ext4_file_write_iter+0x9ec/0xc70 [ 22.359189] [] ? mntput_no_expire+0xfc/0x830 [ 22.365220] [] ? ext4_unwritten_wait+0x200/0x200 [ 22.371599] [] ? mark_held_locks+0xb1/0x100 [ 22.377544] [] ? pipe_lock+0x63/0x80 [ 22.382896] [] ? mutex_lock_nested+0x7dd/0xb80 [ 22.389102] [] ? mutex_lock_nested+0x645/0xb80 [ 22.395305] [] ? pipe_lock+0x63/0x80 [ 22.400641] [] vfs_iter_write+0x1d0/0x3f0 [ 22.406414] [] ? default_llseek+0x290/0x290 [ 22.412354] [] ? mutex_trylock+0x500/0x500 [ 22.418209] [] ? kasan_unpoison_shadow+0x35/0x50 [ 22.424584] [] ? splice_from_pipe_next.part.0+0x20d/0x2c0 [ 22.431741] [] iter_file_splice_write+0x5c1/0xb30 [ 22.438218] [] ? vmsplice_to_user+0x1e0/0x1e0 [ 22.444334] [] ? SyS_fcntl+0x510/0xb10 [ 22.449840] [] ? rcu_read_lock_sched_held+0x10b/0x130 [ 22.456650] [] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 22.463207] [] ? __sb_start_write+0x14f/0x310 [ 22.469320] [] ? vmsplice_to_user+0x1e0/0x1e0 [ 22.475435] [] SyS_splice+0xd71/0x13a0 [ 22.480954] [] ? compat_SyS_fcntl64+0x446/0xa10 [ 22.487254] [] ? compat_SyS_vmsplice+0x160/0x160 [ 22.493630] [] ? __do_page_fault+0x2b3/0x7f0 [ 22.499660] [] ? do_fast_syscall_32+0xd6/0xa90 [ 22.505858] [] ? compat_SyS_vmsplice+0x160/0x160 [ 22.512242] [] do_fast_syscall_32+0x32d/0xa90 [ 22.518359] [] sysenter_flags_fixed+0xd/0x1a [ 22.524532] Code: 00 00 e8 aa a9 e8 ff 48 c7 84 24 50 02 00 00 00 00 00 00 e8 79 21 db ff 48 8b 84 24 c8 00 00 00 48 8d 78 20 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 10 5b 00 00 48 8b 84 24 c8 00 00 00 48 8b 40 [ 22.551419] RIP [] __blockdev_direct_IO+0x36ea/0xb030 [ 22.558430] RSP [ 22.562086] ---[ end trace beb0fa62b94e317a ]--- [ 22.567174] Kernel panic - not syncing: Fatal exception [ 22.573015] Kernel Offset: disabled [ 22.576619] Rebooting in 86400 seconds..