[....] Starting enhanced syslogd: rsyslogd[ 11.886652] audit: type=1400 audit(1518318162.096:4): avc: denied { syslog } for pid=3575 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 '10.128.0.29' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.251972] kasan: CONFIG_KASAN_INLINE enabled [ 27.256569] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.263926] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.270135] Dumping ftrace buffer: [ 27.273648] (ftrace buffer empty) [ 27.277329] Modules linked in: [ 27.280605] CPU: 1 PID: 3741 Comm: syzkaller318775 Not tainted 4.9.80-g8a174b47 #31 [ 27.288365] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.297693] task: ffff8801bd0fb000 task.stack: ffff8801d81b8000 [ 27.303716] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 27.311943] RSP: 0018:ffff8801d81bfab0 EFLAGS: 00010a07 [ 27.317362] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826680eb [ 27.324599] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.331839] RBP: ffff8801d81bfac0 R08: 0000000000000001 R09: 0000000000000000 [ 27.339080] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.346318] R13: 0000000000000020 R14: ffff8801b87a8000 R15: dffffc0000000000 [ 27.353731] FS: 00000000017af880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.361923] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.367772] CR2: 0000000020a2f000 CR3: 00000001b9aea000 CR4: 0000000000160670 [ 27.375012] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.382250] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.389489] Stack: [ 27.391609] ffff8801bd0fb000 ffff8801b87a8158 ffff8801d81bfb20 ffffffff82668111 [ 27.399578] ffff8801b87a8170 ffffed00370f502b ffffed00370f502e ffff8801b87a8168 [ 27.407541] dead4ead00000000 ffff8801b87a8140 0000000000000000 0000000000000000 [ 27.415509] Call Trace: [ 27.418068] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 27.424528] [] sg_finish_rem_req+0x2b5/0x340 [ 27.430555] [] sg_new_read.isra.20+0x39/0x3e0 [ 27.436665] [] ? sg_get_rq_mark+0x142/0x190 [ 27.442604] [] sg_read+0x8b7/0x1440 [ 27.447854] [] ? __lru_cache_add+0x187/0x250 [ 27.453878] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 27.460512] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.466454] [] ? do_huge_pmd_anonymous_page+0x2d4/0x10d0 [ 27.473522] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 27.480161] [] __vfs_read+0x103/0x670 [ 27.485579] [] ? default_llseek+0x290/0x290 [ 27.491519] [] ? fsnotify+0x86/0xf30 [ 27.496850] [] ? fsnotify+0xf30/0xf30 [ 27.502272] [] ? avc_policy_seqno+0x9/0x20 [ 27.508124] [] ? selinux_file_permission+0x82/0x460 [ 27.514757] [] ? security_file_permission+0x89/0x1e0 [ 27.521478] [] ? rw_verify_area+0xe5/0x2b0 [ 27.527331] [] vfs_read+0x11e/0x380 [ 27.532579] [] SyS_read+0xd9/0x1b0 [ 27.537737] [] ? vfs_copy_file_range+0x740/0x740 [ 27.544114] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.550923] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 27.557474] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 27.564017] 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 [ 27.590572] RIP [] __free_pages+0x21/0x80 [ 27.596458] RSP [ 27.600390] ---[ end trace 1f0c9243ce24f1d9 ]--- [ 27.605135] Kernel panic - not syncing: Fatal exception [ 27.610964] Dumping ftrace buffer: [ 27.614474] (ftrace buffer empty) [ 27.618158] Kernel Offset: disabled [ 27.621762] Rebooting in 86400 seconds..