[....] Starting enhanced syslogd: rsyslogd[ 8.957852] audit: type=1400 audit(1513723701.956:4): avc: denied { syslog } for pid=3178 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] 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-2,10.128.0.37' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 18.374783] sg_write: data in/out 486575354/302 bytes for SCSI command 0x67-- guessing data in; [ 18.374783] program syzkaller175669 not setting count and/or reply_len properly [ 18.378050] kasan: CONFIG_KASAN_INLINE enabled [ 18.378664] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 18.379675] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 18.380517] Dumping ftrace buffer: [ 18.381025] (ftrace buffer empty) [ 18.381541] Modules linked in: [ 18.382008] CPU: 1 PID: 3331 Comm: syzkaller175669 Not tainted 4.9.70-gc14c7b3 #110 [ 18.383041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 18.384288] task: ffff8801ca1f9800 task.stack: ffff8801c8d80000 [ 18.385099] RIP: 0010:[] [] sg_read+0xd0c/0x1440 [ 18.386190] RSP: 0018:ffff8801c8d87ac0 EFLAGS: 00010246 [ 18.386917] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff82662783 [ 18.387883] RDX: 0000000000000000 RSI: 000000000000001a RDI: ffff8801c923c370 [ 18.388855] RBP: ffff8801c8d87bc8 R08: 0000000000000000 R09: ffffed0039659289 [ 18.389821] R10: 0000000000000005 R11: ffffed0039659288 R12: 0000000000001000 [ 18.390791] R13: 0000000000000000 R14: ffff8801cb2c9420 R15: ffff8801c923c340 [ 18.391742] FS: 0000000000763880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 18.392847] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 18.393618] CR2: 0000000020701fc2 CR3: 00000001cc5b1000 CR4: 00000000001406e0 [ 18.394575] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 18.399864] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 18.407095] Stack: [ 18.409207] ffff8801d4d37500 ffff8801c8d87af0 ffff8801c923c358 ffff88010000001a [ 18.417510] 0000000000000000 ffff8801c923c368 000000000000003e 0000000000000246 [ 18.425458] ffff8801d145aa00 1ffff100391b0f64 0000000020701fc2 0000000020701fe6 [ 18.433408] Call Trace: [ 18.435967] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 18.442599] [] ? fsnotify+0xf30/0xf30 [ 18.448014] [] ? avc_policy_seqno+0x9/0x20 [ 18.453870] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 18.460853] [] ? security_file_permission+0x89/0x1e0 [ 18.467570] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 18.474197] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 18.480828] [] do_readv_writev+0x520/0x750 [ 18.486675] [] ? vfs_write+0x530/0x530 [ 18.492179] [] ? __pmd_alloc+0x410/0x410 [ 18.497856] [] ? __do_page_fault+0x5ec/0xd40 [ 18.503875] [] vfs_readv+0x84/0xc0 [ 18.509032] [] do_readv+0xe6/0x250 [ 18.514185] [] ? vfs_readv+0xc0/0xc0 [ 18.519521] [] ? entry_SYSCALL_64_fastpath+0x5/0xc6 [ 18.526153] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 18.532959] [] SyS_readv+0x27/0x30 [ 18.538113] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 18.544654] 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 [ 18.570909] RIP [] sg_read+0xd0c/0x1440 [ 18.576616] RSP [ 18.580467] ---[ end trace c6bc6c76a31d0f1c ]--- [ 18.585225] Kernel panic - not syncing: Fatal exception [ 18.591026] Dumping ftrace buffer: [ 18.594534] (ftrace buffer empty) [ 18.598219] Kernel Offset: disabled [ 18.601811] Rebooting in 86400 seconds..