[....] Starting enhanced syslogd: rsyslogd[ 10.941977] audit: type=1400 audit(1514748102.916:4): avc: denied { syslog } for pid=3172 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 '10.128.15.235' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 19.077729] kasan: CONFIG_KASAN_INLINE enabled [ 19.078406] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.079405] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.080246] Dumping ftrace buffer: [ 19.080719] (ftrace buffer empty) [ 19.081243] Modules linked in: [ 19.081709] CPU: 1 PID: 3322 Comm: syzkaller188962 Not tainted 4.9.73-gf3f3457 #11 [ 19.082717] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.083982] task: ffff8801ca36e000 task.stack: ffff8801c8160000 [ 19.084791] RIP: 0010:[] [] sg_read+0xd0c/0x1440 [ 19.085886] RSP: 0018:ffff8801c8167a50 EFLAGS: 00010246 [ 19.086629] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff82667453 [ 19.087592] RDX: 0000000000000000 RSI: 00000000000000a6 RDI: ffff8801c80e2270 [ 19.088542] RBP: ffff8801c8167b58 R08: 0000000000000000 R09: ffffed0039485695 [ 19.089507] R10: 0000000000000005 R11: ffffed0039485694 R12: 0000000000001000 [ 19.090529] R13: 0000000000000000 R14: ffff8801ca42b480 R15: ffff8801c80e2240 [ 19.091505] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f77d6b40 [ 19.092578] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 19.093366] CR2: 0000000020692f36 CR3: 00000001c976c000 CR4: 00000000001406e0 [ 19.094319] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.095280] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.096228] Stack: [ 19.096524] ffff8801d2354580 ffff8801c8167a80 ffff8801c80e2258 ffff8801000000a6 [ 19.097674] 0000000000000000 ffff8801c80e2268 00000000000000ca 0000000000000246 [ 19.104659] ffff8801d1608000 1ffff1003902cf56 0000000020692f36 0000000020692f5a [ 19.112604] Call Trace: [ 19.115158] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.121793] [] ? iov_iter_advance+0x216/0xd70 [ 19.127906] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 19.134888] [] ? security_file_permission+0x89/0x1e0 [ 19.141609] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.148239] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.154869] [] compat_do_readv_writev+0x522/0x760 [ 19.161326] [] ? do_pwritev+0x1a0/0x1a0 [ 19.166916] [] ? _raw_spin_unlock+0x2c/0x50 [ 19.172852] [] ? __fget+0x201/0x3a0 [ 19.178101] [] ? __fget+0x228/0x3a0 [ 19.183341] [] ? __fget+0x47/0x3a0 [ 19.188507] [] compat_readv+0xe3/0x150 [ 19.194011] [] do_compat_readv+0xf4/0x1d0 [ 19.199772] [] ? compat_readv+0x150/0x150 [ 19.205536] [] compat_SyS_readv+0x26/0x30 [ 19.211300] [] ? SyS_pwritev2+0x80/0x80 [ 19.216891] [] do_fast_syscall_32+0x2f7/0x890 executing program [ 19.223006] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 19.229636] [] entry_SYSENTER_compat+0x51/0x60 [ 19.235834] 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 [ 19.262169] RIP [] sg_read+0xd0c/0x1440 [ 19.267878] RSP [ 19.271875] ---[ end trace 08962131da9864fa ]--- [ 19.276622] Kernel panic - not syncing: Fatal exception [ 19.282402] Dumping ftrace buffer: [ 19.285909] (ftrace buffer empty) [ 19.289585] Kernel Offset: disabled [ 19.293175] Rebooting in 86400 seconds..