[....] Starting enhanced syslogd: rsyslogd[ 13.225142] audit: type=1400 audit(1520279481.442:4): avc: denied { syslog } for pid=3647 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 periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.566191] sg_write: data in/out 167162/110 bytes for SCSI command 0xff-- guessing data in; [ 26.566191] program syzkaller267970 not setting count and/or reply_len properly [ 26.583484] kasan: CONFIG_KASAN_INLINE enabled [ 26.588051] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.595427] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.601641] Dumping ftrace buffer: [ 26.605149] (ftrace buffer empty) [ 26.608831] Modules linked in: [ 26.612117] CPU: 1 PID: 3803 Comm: syzkaller267970 Not tainted 4.9.86-gb324a70 #50 [ 26.619791] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.629119] task: ffff8801d814c800 task.stack: ffff8801d7a58000 [ 26.635152] RIP: 0010:[] [] sg_read+0xd06/0x1440 [ 26.643227] RSP: 0018:ffff8801d7a5fa50 EFLAGS: 00010246 [ 26.648649] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8266b40d [ 26.655889] RDX: 0000000000000000 RSI: 000000000000001a RDI: ffff8801d7fa8170 [ 26.663129] RBP: ffff8801d7a5fb60 R08: 0000000000000000 R09: ffffed00369b6005 [ 26.670367] R10: 0000000000000005 R11: ffffed00369b6004 R12: 0000000000001000 [ 26.677609] R13: 0000000000000000 R14: ffff8801b4db0000 R15: ffff8801d7fa8140 [ 26.684861] FS: 0000000000cf3880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.693058] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.698917] CR2: 0000000020e94000 CR3: 00000001d880c000 CR4: 0000000000160670 [ 26.706161] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.713401] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.720639] Stack: [ 26.722759] ffffffff844de3a0 0000000000000105 ffff8801d7fa8158 ffff88010000001a [ 26.730733] 0000000000000246 ffff8801d7fa8168 000000000000003e ffffffff83be4960 [ 26.738711] ffff8801cfe58f00 1ffff1003af4bf56 0000000020e94000 0000000020e94024 [ 26.746678] Call Trace: [ 26.749239] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 26.755882] [] ? fsnotify+0x86/0xf30 [ 26.761213] [] ? fsnotify+0xf30/0xf30 [ 26.766631] [] ? avc_policy_seqno+0x9/0x20 [ 26.772486] [] do_loop_readv_writev.part.17+0xc8/0x2b0 [ 26.779471] [] do_readv_writev+0x5fd/0x740 [ 26.785321] [] ? vfs_write+0x530/0x530 [ 26.790834] [] ? _raw_spin_unlock+0x2c/0x50 [ 26.796775] [] ? do_huge_pmd_anonymous_page+0x2d4/0x10d0 [ 26.803842] [] ? __pmd_alloc+0x410/0x410 [ 26.809527] [] ? avc_policy_seqno+0x9/0x20 [ 26.815378] [] vfs_readv+0x84/0xc0 [ 26.820536] [] do_readv+0xe6/0x250 [ 26.825693] [] ? vfs_readv+0xc0/0xc0 [ 26.831024] [] SyS_readv+0x27/0x30 [ 26.836191] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 26.842736] [] do_syscall_64+0x1a4/0x490 [ 26.848415] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.855306] Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8a 06 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5f 28 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 df 05 00 00 48 8b 1b 48 85 db 0f 84 51 03 00 [ 26.881861] RIP [] sg_read+0xd06/0x1440 [ 26.887568] RSP [ 26.891543] ---[ end trace 6fcf042b71a434d1 ]--- [ 26.896284] Kernel panic - not syncing: Fatal exception [ 26.902055] Dumping ftrace buffer: [ 26.905567] (ftrace buffer empty) [ 26.909246] Kernel Offset: disabled [ 26.912842] Rebooting in 86400 seconds..