[....] Starting enhanced syslogd: rsyslogd[ 12.349332] audit: type=1400 audit(1519144809.622:4): avc: denied { syslog } for pid=3642 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.825050] kasan: CONFIG_KASAN_INLINE enabled [ 19.829671] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.837012] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.843228] Dumping ftrace buffer: [ 19.846736] (ftrace buffer empty) [ 19.850417] Modules linked in: [ 19.853696] CPU: 0 PID: 3797 Comm: syzkaller715896 Not tainted 4.9.82-gcdfc8df #37 [ 19.861370] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.870692] task: ffff8801b4b76000 task.stack: ffff8801d8700000 [ 19.876716] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.884951] RSP: 0018:ffff8801d8707950 EFLAGS: 00010a07 [ 19.890365] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266867b [ 19.897604] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 19.904847] RBP: ffff8801d8707960 R08: 0000000048000000 R09: 0000000000001e30 [ 19.912084] R10: 0000000000002100 R11: ffff8801b4b76000 R12: 0000000000000004 [ 19.919324] R13: 0000000000000020 R14: ffff8801d7da4200 R15: dffffc0000000000 [ 19.926566] FS: 00007ff6aeebe700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 19.934758] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.940606] CR2: 0000000020e94000 CR3: 00000001d86e0000 CR4: 0000000000160670 [ 19.947847] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.955085] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.962321] Stack: [ 19.964437] 0000000000000001 ffff8801d7da4358 ffff8801d87079c0 ffffffff826686a1 [ 19.972405] ffff8801d7da4370 ffffed003afb486b ffffed003afb486e ffff8801d7da4368 [ 19.980363] dead4ead00000000 ffff8801d7da4340 0000000000000000 0000000000000000 [ 19.988334] Call Trace: [ 19.990895] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.997352] [] sg_finish_rem_req+0x2b5/0x340 [ 20.003376] [] sg_new_read.isra.20+0x18d/0x3e0 [ 20.009572] [] sg_read+0x8b7/0x1440 [ 20.014815] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 20.021447] [] ? fsnotify+0xf30/0xf30 [ 20.026867] [] ? avc_policy_seqno+0x9/0x20 [ 20.032719] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 20.039697] [] ? security_file_permission+0x89/0x1e0 [ 20.046413] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 20.053052] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 20.059683] [] do_readv_writev+0x520/0x750 [ 20.065531] [] ? vfs_write+0x530/0x530 [ 20.071034] [] ? __fget+0x20a/0x3b0 [ 20.076276] [] ? __fget+0x231/0x3b0 [ 20.081516] [] ? __fget+0x47/0x3b0 [ 20.086673] [] vfs_readv+0x84/0xc0 [ 20.091827] [] do_readv+0xe6/0x250 [ 20.096984] [] ? vfs_readv+0xc0/0xc0 [ 20.102317] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 20.108604] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 20.115409] [] SyS_readv+0x27/0x30 [ 20.120565] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 20.127110] [] do_syscall_64+0x1a5/0x490 [ 20.132788] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 20.139677] 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 [ 20.166173] RIP [] __free_pages+0x21/0x80 [ 20.172057] RSP [ 20.176253] ---[ end trace 2fc0312ff6de0d79 ]--- [ 20.181135] Kernel panic - not syncing: Fatal exception [ 20.186908] Dumping ftrace buffer: [ 20.190423] (ftrace buffer empty) [ 20.194100] Kernel Offset: disabled [ 20.197701] Rebooting in 86400 seconds..