[....] Starting enhanced syslogd: rsyslogd[ 12.124586] audit: type=1400 audit(1519249815.389:4): avc: denied { syslog } for pid=3520 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 '10.128.15.211' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.736644] kasan: CONFIG_KASAN_INLINE enabled [ 19.741272] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.748883] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.755098] Dumping ftrace buffer: [ 19.758613] (ftrace buffer empty) [ 19.762293] Modules linked in: [ 19.765568] CPU: 0 PID: 3670 Comm: syzkaller642564 Not tainted 4.9.82-g7ec482b #38 [ 19.773240] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.782564] task: ffff8801c15d8000 task.stack: ffff8801d8da0000 [ 19.788587] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.796816] RSP: 0018:ffff8801d8da7950 EFLAGS: 00010a07 [ 19.802231] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266867b [ 19.809473] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 19.816712] RBP: ffff8801d8da7960 R08: 0000000048000000 R09: 0000000000001e30 [ 19.823953] R10: 0000000000002100 R11: ffff8801c15d8000 R12: 0000000000000004 [ 19.831192] R13: 0000000000000020 R14: ffff8801d9272100 R15: dffffc0000000000 [ 19.838433] FS: 00007fc6cbd61700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 19.846628] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.852480] CR2: 0000000020e94000 CR3: 00000001bfbd6000 CR4: 0000000000160670 [ 19.859722] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.866959] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.874197] Stack: [ 19.876315] 0000000000000001 ffff8801d9272258 ffff8801d8da79c0 ffffffff826686a1 [ 19.884275] ffff8801d9272270 ffffed003b24e44b ffffed003b24e44e ffff8801d9272268 [ 19.892265] dead4ead00000000 ffff8801d9272240 0000000000000000 0000000000000000 [ 19.900235] Call Trace: [ 19.902797] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.909262] [] sg_finish_rem_req+0x2b5/0x340 [ 19.915287] [] sg_new_read.isra.20+0x18d/0x3e0 [ 19.921498] [] sg_read+0x8b7/0x1440 [ 19.926756] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 19.933389] [] ? fsnotify+0xf30/0xf30 [ 19.938813] [] ? avc_policy_seqno+0x9/0x20 [ 19.944671] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 19.951747] [] ? security_file_permission+0x89/0x1e0 [ 19.958468] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 19.965098] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 19.972772] [] do_readv_writev+0x520/0x750 [ 19.978626] [] ? vfs_write+0x530/0x530 [ 19.984131] [] ? __fget+0x20a/0x3b0 [ 19.989373] [] ? __fget+0x231/0x3b0 [ 19.994617] [] ? __fget+0x47/0x3b0 [ 19.999774] [] vfs_readv+0x84/0xc0 [ 20.004932] [] do_readv+0xe6/0x250 [ 20.010092] [] ? vfs_readv+0xc0/0xc0 [ 20.015425] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 20.021718] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 20.028525] [] SyS_readv+0x27/0x30 [ 20.033681] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 20.040226] [] do_syscall_64+0x1a5/0x490 [ 20.045904] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 20.052796] 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 [ 20.079312] RIP [] __free_pages+0x21/0x80 [ 20.085195] RSP [ 20.089107] ---[ end trace 0d8949f705b64e3f ]--- [ 20.093913] Kernel panic - not syncing: Fatal exception [ 20.099704] Dumping ftrace buffer: [ 20.103213] (ftrace buffer empty) [ 20.106890] Kernel Offset: disabled [ 20.110485] Rebooting in 86400 seconds..