[....] Starting enhanced syslogd: rsyslogd[ 11.144829] audit: type=1400 audit(1516745353.079:4): avc: denied { syslog } for pid=3183 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 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 '10.128.0.12' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 32.066416] kasan: CONFIG_KASAN_INLINE enabled [ 32.071016] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 32.078389] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.084594] Dumping ftrace buffer: [ 32.088105] (ftrace buffer empty) [ 32.091786] Modules linked in: [ 32.095068] CPU: 1 PID: 3347 Comm: syzkaller080765 Not tainted 4.9.78-ge9dabe6 #19 [ 32.102743] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.112070] task: ffff8801c91c3000 task.stack: ffff8801c7db8000 [ 32.118095] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 32.126341] RSP: 0018:ffff8801c7dbfab0 EFLAGS: 00010a07 [ 32.131759] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826676fb [ 32.139004] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 32.146246] RBP: ffff8801c7dbfac0 R08: 0000000000000001 R09: 0000000000000000 [ 32.153486] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 32.160730] R13: 0000000000000020 R14: ffff8801c7cf2100 R15: dffffc0000000000 [ 32.167971] FS: 0000000000721880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.176168] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.182021] CR2: 0000000020a2f000 CR3: 00000001cc4aa000 CR4: 0000000000160670 [ 32.189273] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.196513] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.203753] Stack: [ 32.205870] ffff8801c91c3000 ffff8801c7cf2258 ffff8801c7dbfb20 ffffffff82667721 [ 32.213844] ffff8801c7cf2270 ffffed0038f9e44b ffffed0038f9e44e ffff8801c7cf2268 [ 32.221816] dead4ead00000000 ffff8801c7cf2240 0000000000000000 0000000000000000 [ 32.229791] Call Trace: [ 32.232350] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 32.238814] [] sg_finish_rem_req+0x2b5/0x340 [ 32.244840] [] sg_new_read.isra.20+0x39/0x3e0 [ 32.250956] [] ? sg_get_rq_mark+0x142/0x190 [ 32.256909] [] sg_read+0x8b7/0x1440 [ 32.262158] [] ? __lru_cache_add+0x187/0x250 [ 32.268184] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 32.274820] [] ? _raw_spin_unlock+0x2c/0x50 [ 32.280764] [] ? do_huge_pmd_anonymous_page+0x2d4/0x10d0 [ 32.287835] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 32.294473] [] __vfs_read+0x103/0x670 [ 32.299894] [] ? default_llseek+0x290/0x290 [ 32.305836] [] ? fsnotify+0x86/0xf30 [ 32.311167] [] ? fsnotify+0xf30/0xf30 [ 32.316595] [] ? avc_policy_seqno+0x9/0x20 [ 32.322450] [] ? selinux_file_permission+0x82/0x460 [ 32.329086] [] ? security_file_permission+0x89/0x1e0 [ 32.335811] [] ? rw_verify_area+0xe5/0x2b0 [ 32.341665] [] vfs_read+0x11e/0x380 [ 32.346913] [] SyS_read+0xd9/0x1b0 [ 32.352074] [] ? vfs_copy_file_range+0x740/0x740 [ 32.358450] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 32.365269] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.371817] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 32.378363] 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 [ 32.405012] RIP [] __free_pages+0x21/0x80 [ 32.410899] RSP [ 32.414759] ---[ end trace 811628e1777fdce3 ]--- [ 32.419495] Kernel panic - not syncing: Fatal exception [ 32.425176] Dumping ftrace buffer: [ 32.428688] (ftrace buffer empty) [ 32.432368] Kernel Offset: disabled [ 32.435969] Rebooting in 86400 seconds..