[....] Starting enhanced syslogd: rsyslogd[ 10.110749] audit: type=1400 audit(1513718401.299:4): avc: denied { syslog } for pid=3171 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 'ci-android-49-kasan-gce-6,10.128.0.31' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 18.350047] sg_write: data in/out 298234/1 bytes for SCSI command 0xe2-- guessing data in; [ 18.350047] program syzkaller249732 not setting count and/or reply_len properly [ 18.354730] kasan: CONFIG_KASAN_INLINE enabled [ 18.355364] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 18.356352] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 18.357194] Dumping ftrace buffer: [ 18.357669] (ftrace buffer empty) [ 18.358161] Modules linked in: [ 18.358629] CPU: 1 PID: 3319 Comm: syzkaller249732 Not tainted 4.9.70-gc14c7b3 #110 [ 18.359669] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 18.360890] task: ffff8801c9b00000 task.stack: ffff8801c97a0000 [ 18.361685] RIP: 0010:[] [] sg_read+0xd0c/0x1440 [ 18.362789] RSP: 0018:ffff8801c97a7ac0 EFLAGS: 00010246 [ 18.363531] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff82662783 [ 18.364498] RDX: 0000000000000000 RSI: 0000000000000071 RDI: ffff8801c972a270 [ 18.365461] RBP: ffff8801c97a7bc8 R08: 0000000000000000 R09: ffffed003b0fa3c1 [ 18.366411] R10: 0000000000000005 R11: ffffed003b0fa3c0 R12: 0000000000001000 [ 18.367364] R13: 0000000000000000 R14: ffff8801d87d1de0 R15: ffff8801c972a240 [ 18.368316] FS: 000000000240f880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 18.369396] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 18.370177] CR2: 0000000020aaaf6b CR3: 00000001c9f6f000 CR4: 00000000001406e0 [ 18.377413] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 18.384646] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 18.391882] Stack: [ 18.393997] ffff8801d50b9d40 ffff8801c97a7af0 ffff8801c972a258 ffff880100000071 [ 18.401938] 0000000000000000 ffff8801c972a268 0000000000000095 0000000000000246 [ 18.409894] ffff8801d1b6e780 1ffff100392f4f64 0000000020aaaf6b 0000000020aaaf8f [ 18.417850] Call Trace: [ 18.420405] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 18.427034] [] ? fsnotify+0xf30/0xf30 [ 18.432447] [] ? avc_policy_seqno+0x9/0x20 [ 18.438296] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 18.445277] [] ? security_file_permission+0x89/0x1e0 [ 18.451994] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 18.458621] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 18.465258] [] do_readv_writev+0x520/0x750 [ 18.471111] [] ? vfs_write+0x530/0x530 [ 18.476612] [] ? __pmd_alloc+0x410/0x410 [ 18.482289] [] ? __do_page_fault+0x5ec/0xd40 [ 18.488317] [] vfs_readv+0x84/0xc0 [ 18.493470] [] do_readv+0xe6/0x250 [ 18.498623] [] ? vfs_readv+0xc0/0xc0 [ 18.503954] [] ? entry_SYSCALL_64_fastpath+0x5/0xc6 [ 18.510585] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 18.517402] [] SyS_readv+0x27/0x30 [ 18.522557] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 18.529096] Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8a 06 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5f 28 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 df 05 00 00 48 8b 1b 48 85 db 0f 84 51 03 00 [ 18.555367] RIP [] sg_read+0xd0c/0x1440 [ 18.561069] RSP [ 18.564979] ---[ end trace 38211301e22f5ca8 ]--- [ 18.569727] Kernel panic - not syncing: Fatal exception [ 18.575493] Dumping ftrace buffer: [ 18.579006] (ftrace buffer empty) [ 18.582683] Kernel Offset: disabled [ 18.586287] Rebooting in 86400 seconds..