[....] Starting enhanced syslogd: rsyslogd[ 10.570456] audit: type=1400 audit(1514418348.760:4): avc: denied { syslog } for pid=3182 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 '10.128.15.201' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 18.942154] kasan: CONFIG_KASAN_INLINE enabled [ 18.942914] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 18.943897] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 18.944719] Dumping ftrace buffer: [ 18.945191] (ftrace buffer empty) [ 18.945785] Modules linked in: [ 18.946252] CPU: 0 PID: 3330 Comm: syzkaller017576 Not tainted 4.9.72-gcb7518e #10 [ 18.947279] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 18.948532] task: ffff8801cd14b000 task.stack: ffff8801c8a68000 [ 18.949326] RIP: 0010:[] [] sg_read+0xd0c/0x1440 [ 18.950518] RSP: 0018:ffff8801c8a6fb60 EFLAGS: 00010246 [ 18.951235] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff82667453 [ 18.952188] RDX: 0000000000000000 RSI: 00000000000000a6 RDI: ffff8801c8ac0170 [ 18.953162] RBP: ffff8801c8a6fc68 R08: 53054a2135708f0e R09: ffffed00392b6fe5 [ 18.954686] R10: 0000000000000005 R11: ffffed00392b6fe4 R12: 0000000000001000 [ 18.955695] R13: 0000000000000000 R14: ffff8801c95b7f00 R15: ffff8801c8ac0140 [ 18.956703] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:000000000815f840 [ 18.957949] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 18.958743] CR2: 00000000209f0000 CR3: 00000001c9723000 CR4: 00000000001406f0 [ 18.959697] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 18.960700] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 18.961728] Stack: [ 18.962039] ffffffff826707c0 ffff8801c8a6fb90 ffff8801c8ac0158 00000000000000a6 [ 18.968559] ffffffff8156f270 ffff8801c8ac0168 00000000000000ca ffffffff81285913 [ 18.976512] ffff8801d153a500 1ffff1003914df78 0000000020185f36 0000000020185f5a [ 18.984473] Call Trace: [ 18.987522] [] ? sg_ioctl+0x2c30/0x2c30 [ 18.993120] [] ? compat_do_readv_writev+0x390/0x760 [ 18.999753] [] ? rcu_read_lock_sched_held+0x103/0x120 [ 19.006555] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.013186] [] ? sg_ioctl+0x2c30/0x2c30 [ 19.018780] [] ? compat_do_readv_writev+0x1f8/0x760 [ 19.025408] [] ? do_pwritev+0x1a0/0x1a0 [ 19.030997] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.037627] [] __vfs_read+0x103/0x670 [ 19.043041] [] ? default_llseek+0x290/0x290 [ 19.048977] [] ? fsnotify+0x86/0xf30 [ 19.054304] [] ? fsnotify+0xf30/0xf30 [ 19.059719] [] ? avc_policy_seqno+0x9/0x20 [ 19.065565] [] ? selinux_file_permission+0x82/0x460 [ 19.072195] [] ? security_file_permission+0x89/0x1e0 [ 19.078911] [] ? rw_verify_area+0xe5/0x2b0 [ 19.084765] [] vfs_read+0x11e/0x380 [ 19.090006] [] SyS_read+0xd9/0x1b0 [ 19.095158] [] ? vfs_copy_file_range+0x740/0x740 [ 19.101534] [] ? do_fast_syscall_32+0xcf/0x890 [ 19.107729] [] ? vfs_copy_file_range+0x740/0x740 [ 19.114098] [] do_fast_syscall_32+0x2f7/0x890 [ 19.120208] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 19.126839] [] entry_SYSENTER_compat+0x51/0x60 [ 19.133031] 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 [ 19.159395] RIP [] sg_read+0xd0c/0x1440 [ 19.165098] RSP [ 19.168955] ---[ end trace 7c75040768ed4d34 ]--- [ 19.173683] Kernel panic - not syncing: Fatal exception [ 19.179469] Dumping ftrace buffer: [ 19.182979] (ftrace buffer empty) [ 19.186660] Kernel Offset: disabled [ 19.190258] Rebooting in 86400 seconds..