[....] Starting enhanced syslogd: rsyslogd[ 15.010553] audit: type=1400 audit(1520458288.701:4): avc: denied { syslog } for pid=3645 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 '10.128.0.36' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 28.027784] kasan: CONFIG_KASAN_INLINE enabled [ 28.032398] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.039859] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.046069] Dumping ftrace buffer: [ 28.049577] (ftrace buffer empty) [ 28.053258] Modules linked in: [ 28.056535] CPU: 1 PID: 3803 Comm: syzkaller351589 Not tainted 4.9.86-gd3a2afb #51 [ 28.064208] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.073529] task: ffff8801b6e4b000 task.stack: ffff8801d7968000 [ 28.079553] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 28.087785] RSP: 0018:ffff8801d796f940 EFLAGS: 00010a07 [ 28.093203] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82668edb [ 28.100443] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 28.107679] RBP: ffff8801d796f950 R08: 0000000048000000 R09: 0000000000001e30 [ 28.114914] R10: 0000000000002100 R11: ffff8801b6e4b000 R12: 0000000000000004 [ 28.122151] R13: 0000000000000020 R14: ffff8801b2898000 R15: dffffc0000000000 [ 28.129390] FS: 00007fa701e86700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.137581] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.143431] CR2: 0000000020e94000 CR3: 00000001da37e000 CR4: 0000000000160670 [ 28.150672] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.157916] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.165157] Stack: [ 28.167283] 0000000000000001 ffff8801b2898158 ffff8801d796f9b0 ffffffff82668f01 [ 28.175264] ffff8801b2898170 ffffed003651302b ffffed003651302e ffff8801b2898168 [ 28.183227] dead4ead00000000 ffff8801b2898140 0000000000000000 0000000000000000 [ 28.191196] Call Trace: [ 28.193756] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 28.200217] [] sg_finish_rem_req+0x2b5/0x340 [ 28.206240] [] sg_new_read.isra.20+0x18d/0x3e0 [ 28.212439] [] sg_read+0x8b7/0x1440 [ 28.217683] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 28.224327] [] ? fsnotify+0x86/0xf30 [ 28.229656] [] ? fsnotify+0xf30/0xf30 [ 28.235075] [] ? avc_policy_seqno+0x9/0x20 [ 28.240935] [] do_loop_readv_writev.part.17+0xc8/0x2b0 [ 28.247828] [] do_readv_writev+0x5fd/0x740 [ 28.253688] [] ? vfs_write+0x530/0x530 [ 28.259198] [] ? check_preemption_disabled+0x3b/0x200 [ 28.266004] [] ? __fget+0x20a/0x3b0 [ 28.271246] [] ? __fget+0x231/0x3b0 [ 28.276490] [] ? __fget+0x47/0x3b0 [ 28.281648] [] vfs_readv+0x84/0xc0 [ 28.286803] [] do_readv+0xe6/0x250 [ 28.291960] [] ? vfs_readv+0xc0/0xc0 [ 28.297292] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 28.303583] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.310391] [] SyS_readv+0x27/0x30 [ 28.315552] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 28.322098] [] do_syscall_64+0x1a4/0x490 [ 28.327775] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.334667] 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 [ 28.361201] RIP [] __free_pages+0x21/0x80 [ 28.367081] RSP [ 28.370906] ---[ end trace ee43e4816eff9dff ]--- [ 28.375645] Kernel panic - not syncing: Fatal exception [ 28.381423] Dumping ftrace buffer: [ 28.384933] (ftrace buffer empty) [ 28.388609] Kernel Offset: disabled [ 28.392203] Rebooting in 86400 seconds..