[....] Starting enhanced syslogd: rsyslogd[ 12.739661] audit: type=1400 audit(1568004134.784:4): avc: denied { syslog } for pid=1919 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 '10.128.1.46' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 39.807510] kasan: CONFIG_KASAN_INLINE enabled [ 39.813493] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 39.827115] Modules linked in: [ 39.830408] CPU: 1 PID: 2079 Comm: syz-executor066 Not tainted 4.4.174+ #4 [ 39.837394] task: ffff8801d4eb5f00 task.stack: ffff8801d42b0000 [ 39.843424] RIP: 0010:[] [] __blockdev_direct_IO+0x36ea/0xb030 [ 39.852786] RSP: 0018:ffff8801d42b7270 EFLAGS: 00010202 [ 39.858214] RAX: 0000000000000004 RBX: dffffc0000000000 RCX: 000000000000000c [ 39.865478] RDX: 0000000000000000 RSI: ffffffff81557477 RDI: 0000000000000020 [ 39.872726] RBP: ffff8801d42b7588 R08: 1ffff1003a82a1c0 R09: ffff8801d4150e00 [ 39.879972] R10: ffffed003a82a1ce R11: ffff8801d4150e77 R12: ffffea000750aa00 [ 39.887217] R13: ffff8801d4150e00 R14: ffff8801da016d40 R15: ffff8801d8360000 [ 39.894462] FS: 000000000186a880(0063) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 39.902704] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.908560] CR2: 00000000200110ff CR3: 00000001d576f000 CR4: 00000000001606b0 [ 39.915808] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.923075] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.930320] Stack: [ 39.932456] fffffbfff05c2202 ffff8801d42b7380 0005080000000000 0000000000001000 [ 39.940476] 00000000000226c0 ffff8801d8360079 0000000041b58ab3 0000000000011000 [ 39.948480] ffff8801d42b73d0 00001000d42b72e0 fffffffffffff000 0000000000000fff [ 39.956470] Call Trace: [ 39.959036] [] ? sb_init_dio_done_wq+0x80/0x80 [ 39.965243] [] ? check_preemption_disabled+0x3c/0x200 [ 39.972059] [] ? check_preemption_disabled+0x3c/0x200 [ 39.978899] [] ? _ext4_get_block+0x690/0x690 [ 39.984930] [] ? ext4_ind_direct_IO+0x6dc/0xb90 [ 39.991224] [] ? ext4_journal_check_start+0x116/0x1a0 [ 39.998038] [] ? __ext4_journal_start_sb+0x13e/0x510 [ 40.004776] [] ext4_ind_direct_IO+0x3e1/0xb90 [ 40.010907] [] ? ext4_ind_map_blocks+0x21f0/0x21f0 [ 40.017464] [] ext4_direct_IO+0x8c1/0x2a80 [ 40.023323] [] ? __lock_acquire+0x22e3/0x4f50 [ 40.029443] [] ? ext4_end_io_dio+0xc0/0xc0 [ 40.035300] [] ? trace_hardirqs_on+0x10/0x10 [ 40.041332] [] ? ext4_xattr_security_get+0x85/0xb0 [ 40.047898] [] ? generic_getxattr+0x128/0x1a0 [ 40.054017] [] ? xattr_resolve_name+0x1f0/0x1f0 [ 40.060313] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 40.067047] [] ? mark_held_locks+0xb1/0x100 [ 40.073000] [] ? filemap_check_errors+0x9d/0xe0 [ 40.079305] [] generic_file_direct_write+0x276/0x4f0 [ 40.086033] [] ? current_fs_time+0x18/0x70 [ 40.091891] [] ? filemap_write_and_wait_range+0xb0/0xb0 [ 40.098882] [] ? file_update_time+0xc1/0x3c0 [ 40.104924] [] ? mutex_trylock+0x500/0x500 [ 40.110789] [] __generic_file_write_iter+0x245/0x540 [ 40.117518] [] ext4_file_write_iter+0x9ec/0xc70 [ 40.123811] [] ? mntput_no_expire+0xfc/0x830 [ 40.129845] [] ? ext4_unwritten_wait+0x200/0x200 [ 40.136266] [] ? mark_held_locks+0xb1/0x100 [ 40.142260] [] ? pipe_lock+0x63/0x80 [ 40.147599] [] ? mutex_lock_nested+0x7dd/0xb80 [ 40.153807] [] ? mutex_lock_nested+0x645/0xb80 [ 40.160045] [] ? pipe_lock+0x63/0x80 [ 40.165384] [] ? trace_hardirqs_on+0xd/0x10 [ 40.171332] [] vfs_iter_write+0x1d0/0x3f0 [ 40.177107] [] ? default_llseek+0x290/0x290 [ 40.183051] [] ? kasan_unpoison_shadow+0x35/0x50 [ 40.189432] [] ? splice_from_pipe_next.part.0+0x20d/0x2c0 [ 40.196596] [] iter_file_splice_write+0x5c1/0xb30 [ 40.203060] [] ? vmsplice_to_user+0x1e0/0x1e0 [ 40.209180] [] ? rcu_read_lock_sched_held+0x10b/0x130 [ 40.215995] [] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 40.222547] [] ? __sb_start_write+0x14f/0x310 [ 40.228665] [] ? vmsplice_to_user+0x1e0/0x1e0 [ 40.234783] [] SyS_splice+0xd71/0x13a0 [ 40.240296] [] ? SyS_accept+0x30/0x30 [ 40.245721] [] ? compat_SyS_vmsplice+0x160/0x160 [ 40.252105] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 40.258571] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 40.265142] 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 [ 40.292169] RIP [] __blockdev_direct_IO+0x36ea/0xb030 [ 40.299125] RSP [ 40.302827] ---[ end trace afe4501499abb743 ]--- [ 40.307570] Kernel panic - not syncing: Fatal exception [ 40.313517] Kernel Offset: disabled [ 40.317122] Rebooting in 86400 seconds..