[....] Starting enhanced syslogd: rsyslogd[ 10.411976] audit: type=1400 audit(1515568864.629:4): avc: denied { syslog } for pid=3167 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 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 '10.128.0.17' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 28.888943] kasan: CONFIG_KASAN_INLINE enabled [ 28.889699] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.890747] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.891569] Dumping ftrace buffer: [ 28.892087] (ftrace buffer empty) [ 28.892604] Modules linked in: [ 28.893074] CPU: 1 PID: 3328 Comm: syzkaller676048 Not tainted 4.9.75-g8910fa5 #9 [ 28.894081] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.895304] task: ffff8801cb258000 task.stack: ffff8801c84a0000 [ 28.896111] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 28.897223] RSP: 0018:ffff8801c84a79b0 EFLAGS: 00010a07 [ 28.897954] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266631b [ 28.898907] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.899863] RBP: ffff8801c84a79c0 R08: 0000000000000001 R09: 0000000000000000 [ 28.900818] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.901846] R13: 0000000000000020 R14: ffff8801c9cf8000 R15: dffffc0000000000 [ 28.902855] FS: 00000000014c9880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.903930] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.904725] CR2: 0000000020ef0fe0 CR3: 00000001cd4dc000 CR4: 0000000000160670 [ 28.905691] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.906645] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.907598] Stack: [ 28.907910] ffff8801cb258000 ffff8801c9cf8158 ffff8801c84a7a20 ffffffff82666341 [ 28.909045] ffff8801c9cf8170 ffffed003939f02b ffffed003939f02e ffff8801c9cf8168 [ 28.914515] dead4ead00000000 ffff8801c9cf8140 0000000000000000 0000000000000000 [ 28.922469] Call Trace: [ 28.925025] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 28.931485] [] sg_finish_rem_req+0x2b5/0x340 [ 28.937512] [] sg_new_read.isra.20+0x39/0x3e0 [ 28.943638] [] ? sg_get_rq_mark+0x142/0x190 [ 28.949577] [] sg_read+0x8bd/0x1440 [ 28.954822] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 28.961457] [] ? fsnotify+0xf30/0xf30 [ 28.966899] [] ? avc_policy_seqno+0x9/0x20 [ 28.972753] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 28.979735] [] ? security_file_permission+0x89/0x1e0 [ 28.986456] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 28.993099] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 28.999738] [] do_readv_writev+0x520/0x750 [ 29.005593] [] ? vfs_write+0x530/0x530 [ 29.011101] [] ? _raw_spin_unlock+0x2c/0x50 [ 29.017061] [] ? __pmd_alloc+0x410/0x410 [ 29.022743] [] ? __do_page_fault+0x5ec/0xd40 [ 29.028786] [] vfs_readv+0x84/0xc0 [ 29.033945] [] do_readv+0xe6/0x250 [ 29.039104] [] ? vfs_readv+0xc0/0xc0 [ 29.044447] [] ? entry_SYSCALL_64_fastpath+0x5/0xe2 [ 29.051084] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 29.057893] [] SyS_readv+0x27/0x30 [ 29.063051] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 29.069606] Code: e9 27 fc ff ff 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 3d [ 29.096022] RIP [] __free_pages+0x21/0x80 [ 29.101919] RSP [ 29.105699] ---[ end trace 4bddb2b4eaf5ed20 ]--- [ 29.110433] Kernel panic - not syncing: Fatal exception [ 29.115806] Dumping ftrace buffer: [ 29.119316] (ftrace buffer empty) [ 29.122993] Kernel Offset: disabled [ 29.126603] Rebooting in 86400 seconds..