[....] Starting enhanced syslogd: rsyslogd[ 12.955031] audit: type=1400 audit(1568004118.698:4): avc: denied { syslog } for pid=1918 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 '10.128.10.37' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.662495] kasan: CONFIG_KASAN_INLINE enabled [ 38.667028] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.681314] Modules linked in: [ 38.684637] CPU: 1 PID: 2077 Comm: syz-executor177 Not tainted 4.4.174+ #17 [ 38.691717] task: ffff8801d4d48000 task.stack: ffff8800b72d8000 [ 38.697783] RIP: 0010:[] [] __blockdev_direct_IO+0x36ea/0xb030 [ 38.707290] RSP: 0018:ffff8800b72df200 EFLAGS: 00010202 [ 38.712720] RAX: 0000000000000004 RBX: dffffc0000000000 RCX: 000000000000000c [ 38.719986] RDX: 0000000000000000 RSI: ffffffff81557477 RDI: 0000000000000020 [ 38.727247] RBP: ffff8800b72df518 R08: 1ffff10016fe59c0 R09: ffff8800b7f2ce00 [ 38.734504] R10: ffffed0016fe59ce R11: ffff8800b7f2ce77 R12: ffffea0002dae400 [ 38.741871] R13: ffff8800b7f2ce00 R14: ffff8801da266780 R15: ffff8800b6b50000 [ 38.749125] FS: 0000000000000000(0000) GS:ffff8801db700000(0063) knlGS:0000000008ea2840 [ 38.757598] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 38.763470] CR2: 00000000200110ff CR3: 00000000b7fc2000 CR4: 00000000001606b0 [ 38.770734] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.777988] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.785237] Stack: [ 38.787369] fffffbfff05c2202 ffff8800b72df310 0005080000000000 0000000000001000 [ 38.795404] 0000000000008220 ffff8800b6b50079 0000000041b58ab3 0000000000011000 [ 38.803436] ffff8800b72df360 00001000d4d488c0 fffffffffffff000 0000000000000fff [ 38.811458] Call Trace: [ 38.814054] [] ? sb_init_dio_done_wq+0x80/0x80 [ 38.820272] [] ? check_preemption_disabled+0x3c/0x200 [ 38.827090] [] ? check_preemption_disabled+0x3c/0x200 [ 38.833912] [] ? _ext4_get_block+0x690/0x690 [ 38.839958] [] ? ext4_ind_direct_IO+0x6dc/0xb90 [ 38.846263] [] ? ext4_journal_check_start+0x116/0x1a0 [ 38.853087] [] ? __ext4_journal_start_sb+0x13e/0x510 [ 38.859826] [] ext4_ind_direct_IO+0x3e1/0xb90 [ 38.865960] [] ? ext4_ind_map_blocks+0x21f0/0x21f0 [ 38.872519] [] ext4_direct_IO+0x8c1/0x2a80 [ 38.878477] [] ? __lock_acquire+0x22e3/0x4f50 [ 38.884628] [] ? ext4_end_io_dio+0xc0/0xc0 [ 38.890498] [] ? trace_hardirqs_on+0x10/0x10 [ 38.896538] [] ? ext4_xattr_security_get+0x85/0xb0 [ 38.903112] [] ? generic_getxattr+0x128/0x1a0 [ 38.909234] [] ? xattr_resolve_name+0x1f0/0x1f0 [ 38.915542] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 38.922339] [] ? mark_held_locks+0xb1/0x100 [ 38.928294] [] ? filemap_check_errors+0x9d/0xe0 [ 38.934686] [] generic_file_direct_write+0x276/0x4f0 [ 38.941421] [] ? current_fs_time+0x18/0x70 [ 38.947298] [] ? filemap_write_and_wait_range+0xb0/0xb0 [ 38.954306] [] ? file_update_time+0xc1/0x3c0 [ 38.960360] [] ? mutex_trylock+0x500/0x500 [ 38.966242] [] __generic_file_write_iter+0x245/0x540 [ 38.972999] [] ext4_file_write_iter+0x9ec/0xc70 [ 38.979534] [] ? ext4_unwritten_wait+0x200/0x200 [ 38.985927] [] ? mark_held_locks+0xb1/0x100 [ 38.991921] [] ? pipe_lock+0x63/0x80 [ 38.997264] [] ? mutex_lock_nested+0x7dd/0xb80 [ 39.003488] [] ? mutex_lock_nested+0x645/0xb80 [ 39.009704] [] ? pipe_lock+0x63/0x80 [ 39.015056] [] vfs_iter_write+0x1d0/0x3f0 [ 39.020948] [] ? default_llseek+0x290/0x290 [ 39.026918] [] ? mutex_trylock+0x500/0x500 [ 39.033134] [] ? kasan_unpoison_shadow+0x35/0x50 [ 39.039537] [] ? splice_from_pipe_next.part.0+0x20d/0x2c0 [ 39.046828] [] iter_file_splice_write+0x5c1/0xb30 [ 39.053302] [] ? vmsplice_to_user+0x1e0/0x1e0 [ 39.059450] [] ? rcu_read_lock_sched_held+0x10b/0x130 [ 39.066290] [] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 39.072855] [] ? __sb_start_write+0x14f/0x310 [ 39.079000] [] ? vmsplice_to_user+0x1e0/0x1e0 [ 39.085136] [] SyS_splice+0xd71/0x13a0 [ 39.090655] [] ? SyS_accept+0x30/0x30 [ 39.096190] [] ? compat_SyS_vmsplice+0x160/0x160 [ 39.102729] [] ? __do_page_fault+0x2b3/0x7f0 [ 39.108804] [] ? do_fast_syscall_32+0xd6/0xa90 [ 39.115022] [] ? compat_SyS_vmsplice+0x160/0x160 [ 39.121605] [] do_fast_syscall_32+0x32d/0xa90 [ 39.127751] [] sysenter_flags_fixed+0xd/0x1a [ 39.133799] 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 [ 39.161893] RIP [] __blockdev_direct_IO+0x36ea/0xb030 [ 39.168851] RSP [ 39.173216] ---[ end trace e55d8d41e8bdb80d ]--- [ 39.177974] Kernel panic - not syncing: Fatal exception [ 39.183864] Kernel Offset: disabled [ 39.187609] Rebooting in 86400 seconds..