[....] Starting enhanced syslogd: rsyslogd[ 10.935063] audit: type=1400 audit(1514781156.450:4): avc: denied { syslog } for pid=3168 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?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: [ 18.764853] kasan: CONFIG_KASAN_INLINE enabled [ 18.765577] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 18.766572] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 18.767402] Dumping ftrace buffer: [ 18.767900] (ftrace buffer empty) [ 18.768395] Modules linked in: [ 18.768861] CPU: 1 PID: 3316 Comm: syzkaller633468 Not tainted 4.9.73-gf3f3457 #11 [ 18.769880] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 18.771215] task: ffff8801cc2db000 task.stack: ffff8801c92c8000 [ 18.772009] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 18.773152] RSP: 0018:ffff8801c92cfa50 EFLAGS: 00010a07 [ 18.774182] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 18.775781] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 18.777080] RBP: ffff8801c92cfa60 R08: 0000000000000001 R09: 0000000000000000 [ 18.778827] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 18.779820] R13: 0000000000000020 R14: ffff8801cc14c200 R15: dffffc0000000000 [ 18.780795] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000095f9840 [ 18.781897] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 18.782670] CR2: 0000000020001000 CR3: 00000001bf034000 CR4: 00000000001406e0 [ 18.783624] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 18.784608] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 18.790038] Stack: [ 18.792154] ffff8801cc2db000 ffff8801cc14c358 ffff8801c92cfac0 ffffffff82664fc1 [ 18.800096] ffff8801cc14c370 ffffed003982986b ffffed003982986e ffff8801cc14c368 [ 18.808050] dead4ead00000000 ffff8801cc14c340 0000000000000000 0000000000000000 [ 18.816004] Call Trace: [ 18.818565] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 18.825023] [] sg_finish_rem_req+0x2b5/0x340 [ 18.831045] [] sg_new_read.isra.20+0x39/0x3e0 [ 18.837156] [] ? sg_get_rq_mark+0x142/0x190 [ 18.843093] [] sg_read+0x8bd/0x1440 [ 18.848340] [] ? save_stack_trace+0x16/0x20 [ 18.854278] [] ? save_stack+0x43/0xd0 [ 18.859691] [] ? kasan_slab_free+0x72/0xc0 [ 18.866274] [] ? kmem_cache_free+0xc7/0x300 [ 18.872212] [] ? putname+0xee/0x130 [ 18.877456] [] ? do_sys_open+0x252/0x4c0 [ 18.883140] [] ? do_fast_syscall_32+0x2f7/0x890 [ 18.889432] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 18.896069] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 18.902892] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 18.911090] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 18.917721] [] __vfs_read+0x103/0x670 [ 18.923141] [] ? default_llseek+0x290/0x290 [ 18.929082] [] ? fsnotify+0x86/0xf30 [ 18.934416] [] ? fsnotify+0xf30/0xf30 [ 18.939840] [] ? avc_policy_seqno+0x9/0x20 [ 18.945693] [] ? selinux_file_permission+0x82/0x460 [ 18.952324] [] ? security_file_permission+0x89/0x1e0 [ 18.959051] [] ? rw_verify_area+0xe5/0x2b0 [ 18.964901] [] vfs_read+0x11e/0x380 [ 18.970143] [] SyS_read+0xd9/0x1b0 [ 18.975297] [] ? vfs_copy_file_range+0x740/0x740 [ 18.981674] [] ? do_fast_syscall_32+0xcf/0x890 [ 18.987873] [] ? vfs_copy_file_range+0x740/0x740 [ 18.994245] [] do_fast_syscall_32+0x2f7/0x890 [ 19.000364] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 19.007001] [] entry_SYSENTER_compat+0x51/0x60 [ 19.013202] 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 [ 19.039478] RIP [] __free_pages+0x21/0x80 [ 19.045355] RSP [ 19.049181] ---[ end trace ee7889b7a83f7a33 ]--- [ 19.053921] Kernel panic - not syncing: Fatal exception [ 19.060046] Dumping ftrace buffer: [ 19.063556] (ftrace buffer empty) [ 19.067234] Kernel Offset: disabled [ 19.070838] Rebooting in 86400 seconds..