[....] Starting enhanced syslogd: rsyslogd[ 15.502498] audit: type=1400 audit(1521060197.530:4): avc: denied { syslog } for pid=3652 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 '10.128.0.13' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.489777] kasan: CONFIG_KASAN_INLINE enabled [ 27.494416] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.503081] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.509308] Dumping ftrace buffer: [ 27.512820] (ftrace buffer empty) [ 27.516504] Modules linked in: [ 27.519802] CPU: 1 PID: 3810 Comm: syzkaller943246 Not tainted 4.9.87-g97d7f1c #54 [ 27.527478] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.536803] task: ffff8801c318b000 task.stack: ffff8801d7c68000 [ 27.542828] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 27.551060] RSP: 0018:ffff8801d7c6f940 EFLAGS: 00010a07 [ 27.556475] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826692ab [ 27.563716] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 27.570959] RBP: ffff8801d7c6f950 R08: 0000000048000000 R09: 0000000000001e30 [ 27.578221] R10: 0000000000002100 R11: ffff8801c318b000 R12: 0000000000000004 [ 27.585464] R13: 0000000000000020 R14: ffff8801d7d22100 R15: dffffc0000000000 [ 27.592797] FS: 00007f76e6e44700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.601005] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.606864] CR2: 0000000020e94000 CR3: 00000001d9920000 CR4: 0000000000160670 [ 27.614107] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.621350] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.628590] Stack: [ 27.630709] 0000000000000001 ffff8801d7d22258 ffff8801d7c6f9b0 ffffffff826692d1 [ 27.638680] ffff8801d7d22270 ffffed003afa444b ffffed003afa444e ffff8801d7d22268 [ 27.646648] dead4ead00000000 ffff8801d7d22240 0000000000000000 0000000000000000 [ 27.654618] Call Trace: [ 27.657177] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 27.663639] [] sg_finish_rem_req+0x2b5/0x340 [ 27.669665] [] sg_new_read.isra.20+0x18d/0x3e0 [ 27.675864] [] sg_read+0x8b7/0x1440 [ 27.681113] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 27.687749] [] ? fsnotify+0x86/0xf30 [ 27.693080] [] ? fsnotify+0xf30/0xf30 [ 27.698499] [] ? avc_policy_seqno+0x9/0x20 [ 27.704353] [] do_loop_readv_writev.part.17+0xc8/0x2b0 [ 27.711247] [] do_readv_writev+0x5fd/0x740 [ 27.717111] [] ? vfs_write+0x530/0x530 [ 27.722626] [] ? __fget+0x20a/0x3b0 [ 27.727870] [] ? __fget+0x231/0x3b0 [ 27.733113] [] ? __fget+0x47/0x3b0 [ 27.738278] [] vfs_readv+0x84/0xc0 [ 27.743437] [] do_readv+0xe6/0x250 [ 27.748596] [] ? vfs_readv+0xc0/0xc0 [ 27.753929] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 27.760223] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.767034] [] SyS_readv+0x27/0x30 [ 27.772194] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 27.778754] [] do_syscall_64+0x1a4/0x490 [ 27.784437] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.791332] 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 [ 27.817892] RIP [] __free_pages+0x21/0x80 [ 27.823777] RSP [ 27.827821] ---[ end trace 99cdbdcab1175f56 ]--- [ 27.832606] Kernel panic - not syncing: Fatal exception [ 27.838430] Dumping ftrace buffer: [ 27.841943] (ftrace buffer empty) [ 27.845621] Kernel Offset: disabled [ 27.849218] Rebooting in 86400 seconds..