[ 13.916508] audit: type=1400 audit(1569577810.818:4): avc: denied { syslog } for pid=1915 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [....] Starting enhanced syslogd: rsyslogd[?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 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 '10.128.0.242' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 42.383406] kasan: CONFIG_KASAN_INLINE enabled [ 42.388018] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 42.402549] Modules linked in: [ 42.405865] CPU: 1 PID: 2078 Comm: syz-executor841 Not tainted 4.4.174+ #4 [ 42.412865] task: ffff8801d5865f00 task.stack: ffff8801d40d0000 [ 42.418906] RIP: 0010:[] [] __blockdev_direct_IO+0x36ea/0xb030 [ 42.428352] RSP: 0018:ffff8801d40d7270 EFLAGS: 00010202 [ 42.433957] RAX: 0000000000000004 RBX: dffffc0000000000 RCX: 000000000000000c [ 42.441456] RDX: 0000000000000000 RSI: ffffffff81557477 RDI: 0000000000000020 [ 42.448802] RBP: ffff8801d40d7588 R08: 1ffff1003abfdd60 R09: ffff8801d5feeb00 [ 42.456069] R10: ffffed003abfdd6e R11: ffff8801d5feeb77 R12: ffffea0002d90200 [ 42.464029] R13: ffff8801d5feeb00 R14: ffff8801da010b80 R15: ffff8800b6e3c000 [ 42.471396] FS: 00007f6294794700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 42.479617] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.485731] CR2: 00000000200110ff CR3: 00000001d4a3a000 CR4: 00000000001606b0 [ 42.492997] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.500261] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.507764] Stack: [ 42.510024] fffffbfff05c2202 ffff8801d40d7380 0005080000000000 0000000000001000 [ 42.518331] 0000000000008420 ffff8800b6e3c079 0000000041b58ab3 0000000000011000 [ 42.526476] ffff8801d40d73d0 00001000d40d72e0 fffffffffffff000 0000000000000fff [ 42.534564] Call Trace: [ 42.537158] [] ? sb_init_dio_done_wq+0x80/0x80 [ 42.543405] [] ? check_preemption_disabled+0x3c/0x200 [ 42.550238] [] ? check_preemption_disabled+0x3c/0x200 [ 42.557081] [] ? _ext4_get_block+0x690/0x690 [ 42.563130] [] ? ext4_ind_direct_IO+0x6dc/0xb90 [ 42.569437] [] ? ext4_journal_check_start+0x116/0x1a0 [ 42.576269] [] ? __ext4_journal_start_sb+0x13e/0x510 [ 42.583010] [] ext4_ind_direct_IO+0x3e1/0xb90 [ 42.589185] [] ? ext4_ind_map_blocks+0x21f0/0x21f0 [ 42.595758] [] ext4_direct_IO+0x8c1/0x2a80 [ 42.601636] [] ? __lock_acquire+0x22e3/0x4f50 [ 42.607770] [] ? ext4_end_io_dio+0xc0/0xc0 [ 42.613652] [] ? trace_hardirqs_on+0x10/0x10 [ 42.619711] [] ? ext4_xattr_security_get+0x85/0xb0 [ 42.626558] [] ? generic_getxattr+0x128/0x1a0 [ 42.632823] [] ? xattr_resolve_name+0x1f0/0x1f0 [ 42.639266] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 42.646020] [] ? mark_held_locks+0xb1/0x100 [ 42.652145] [] ? filemap_check_errors+0x9d/0xe0 [ 42.658692] [] generic_file_direct_write+0x276/0x4f0 [ 42.665542] [] ? current_fs_time+0x18/0x70 [ 42.671428] [] ? filemap_write_and_wait_range+0xb0/0xb0 [ 42.678487] [] ? file_update_time+0xc1/0x3c0 [ 42.684541] [] ? mutex_trylock+0x500/0x500 [ 42.690420] [] __generic_file_write_iter+0x245/0x540 [ 42.697169] [] ext4_file_write_iter+0x9ec/0xc70 [ 42.703569] [] ? ext4_unwritten_wait+0x200/0x200 [ 42.709965] [] ? mark_held_locks+0xb1/0x100 [ 42.715961] [] ? pipe_lock+0x63/0x80 [ 42.721357] [] ? mutex_lock_nested+0x7dd/0xb80 [ 42.727630] [] ? mutex_lock_nested+0x645/0xb80 [ 42.734086] [] ? pipe_lock+0x63/0x80 [ 42.739443] [] vfs_iter_write+0x1d0/0x3f0 [ 42.745241] [] ? default_llseek+0x290/0x290 [ 42.751561] [] ? kasan_unpoison_shadow+0x35/0x50 [ 42.758357] [] ? splice_from_pipe_next.part.0+0x20d/0x2c0 [ 42.765996] [] iter_file_splice_write+0x5c1/0xb30 [ 42.772479] [] ? vmsplice_to_user+0x1e0/0x1e0 [ 42.778777] [] ? rcu_read_lock_sched_held+0x10b/0x130 [ 42.785745] [] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 42.792432] [] ? __sb_start_write+0x14f/0x310 [ 42.798682] [] ? vmsplice_to_user+0x1e0/0x1e0 [ 42.804818] [] SyS_splice+0xd71/0x13a0 [ 42.810441] [] ? compat_SyS_vmsplice+0x160/0x160 [ 42.817207] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 42.823827] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 42.830393] 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 [ 42.858825] RIP [] __blockdev_direct_IO+0x36ea/0xb030 [ 42.865792] RSP [ 42.869971] ---[ end trace 24aeae63ab93a6f7 ]--- [ 42.874738] Kernel panic - not syncing: Fatal exception [ 42.881208] Kernel Offset: disabled [ 42.884956] Rebooting in 86400 seconds..