[....] Starting enhanced syslogd: rsyslogd[ 13.811571] audit: type=1400 audit(1516467225.000:4): 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 '10.128.0.58' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.664174] kasan: CONFIG_KASAN_INLINE enabled [ 27.668898] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.676234] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.682434] Dumping ftrace buffer: [ 27.685942] (ftrace buffer empty) [ 27.689622] Modules linked in: [ 27.692904] CPU: 0 PID: 3323 Comm: syzkaller675726 Not tainted 4.9.77-ge12a9c4 #18 [ 27.700579] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.709904] task: ffff8801cb6b4800 task.stack: ffff8801c9910000 [ 27.715929] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 27.724168] RSP: 0018:ffff8801c9917ab0 EFLAGS: 00010a07 [ 27.729587] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266751b [ 27.736829] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.744072] RBP: ffff8801c9917ac0 R08: 0000000000000001 R09: 0000000000000000 [ 27.751311] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.758551] R13: 0000000000000020 R14: ffff8801c8fd0000 R15: dffffc0000000000 [ 27.765793] FS: 00000000015ea880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.773990] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.779843] CR2: 0000000020a2f000 CR3: 00000001caf12000 CR4: 0000000000160670 [ 27.787086] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.794326] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.801564] Stack: [ 27.803684] ffff8801cb6b4800 ffff8801c8fd0158 ffff8801c9917b20 ffffffff82667541 [ 27.811655] ffff8801c8fd0170 ffffed00391fa02b ffffed00391fa02e ffff8801c8fd0168 [ 27.819635] dead4ead00000000 ffff8801c8fd0140 0000000000000000 0000000000000000 [ 27.827626] Call Trace: [ 27.830186] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 27.836648] [] sg_finish_rem_req+0x2b5/0x340 [ 27.842682] [] sg_new_read.isra.20+0x39/0x3e0 [ 27.848808] [] ? sg_get_rq_mark+0x142/0x190 [ 27.854753] [] sg_read+0x8bd/0x1440 [ 27.860003] [] ? __lru_cache_add+0x187/0x250 [ 27.866049] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 27.872685] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.878631] [] ? do_huge_pmd_anonymous_page+0x2d4/0x10d0 [ 27.885700] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 27.892340] [] __vfs_read+0x103/0x670 [ 27.897760] [] ? default_llseek+0x290/0x290 [ 27.903700] [] ? fsnotify+0x86/0xf30 [ 27.909050] [] ? fsnotify+0xf30/0xf30 [ 27.914471] [] ? avc_policy_seqno+0x9/0x20 [ 27.920325] [] ? selinux_file_permission+0x82/0x460 [ 27.926960] [] ? security_file_permission+0x89/0x1e0 [ 27.933686] [] ? rw_verify_area+0xe5/0x2b0 [ 27.939539] [] vfs_read+0x11e/0x380 [ 27.944785] [] SyS_read+0xd9/0x1b0 [ 27.949965] [] ? vfs_copy_file_range+0x740/0x740 [ 27.956352] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.963176] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 27.969727] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 27.976274] 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 [ 28.002835] RIP [] __free_pages+0x21/0x80 [ 28.008724] RSP [ 28.012810] ---[ end trace 7e00195fbf9ff7a1 ]--- [ 28.017642] Kernel panic - not syncing: Fatal exception [ 28.023521] Dumping ftrace buffer: [ 28.027040] (ftrace buffer empty) [ 28.030721] Kernel Offset: disabled [ 28.034320] Rebooting in 86400 seconds..