[....] Starting enhanced syslogd: rsyslogd[ 10.764864] audit: type=1400 audit(1514427752.047:4): avc: denied { syslog } for pid=3176 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] 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 '10.128.15.205' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.917141] kasan: CONFIG_KASAN_INLINE enabled [ 19.917863] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.918842] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.919694] Dumping ftrace buffer: [ 19.920174] (ftrace buffer empty) [ 19.920669] Modules linked in: [ 19.921145] CPU: 1 PID: 3327 Comm: syzkaller092389 Not tainted 4.9.72-gcb7518e #10 [ 19.922152] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.923409] task: ffff8801c9c5e000 task.stack: ffff8801c8a40000 [ 19.924217] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.925325] RSP: 0018:ffff8801c8a47990 EFLAGS: 00010a07 [ 19.926077] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 19.927040] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 19.927990] RBP: ffff8801c8a479a0 R08: ffffed00392f6858 R09: ffff8801c97b42a0 [ 19.928941] R10: 0000000000000005 R11: ffffed00392f6858 R12: 0000000000000004 [ 19.929897] R13: 0000000000000020 R14: ffff8801c8d34200 R15: dffffc0000000000 [ 19.930905] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7714b40 [ 19.932016] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 19.932788] CR2: 0000000000001000 CR3: 00000001cdb47000 CR4: 00000000001406e0 [ 19.933785] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.934734] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.935684] Stack: [ 19.936006] 0000000000000000 ffff8801c8d34358 ffff8801c8a47a00 ffffffff82664fc1 [ 19.937148] ffff8801c8d34370 ffffed00391a686b ffffed00391a686e ffff8801c8d34368 [ 19.944464] dead4ead00000000 ffff8801c8d34340 0000000000000000 0000000000000000 [ 19.952439] Call Trace: [ 19.955008] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.961479] [] sg_finish_rem_req+0x2b5/0x340 [ 19.967502] [] sg_read+0xa1c/0x1440 [ 19.972751] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.979382] [] ? fsnotify+0xf30/0xf30 [ 19.984798] [] ? avc_policy_seqno+0x9/0x20 [ 19.990656] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 19.997636] [] ? security_file_permission+0x89/0x1e0 [ 20.004370] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.011008] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.017641] [] compat_do_readv_writev+0x522/0x760 [ 20.024114] [] ? do_pwritev+0x1a0/0x1a0 [ 20.029715] [] ? exit_robust_list+0x230/0x230 [ 20.035832] [] ? check_preemption_disabled+0x3b/0x200 [ 20.042638] [] ? __fget+0x201/0x3a0 [ 20.047879] [] ? __fget+0x228/0x3a0 [ 20.053120] [] ? __fget+0x47/0x3a0 [ 20.058276] [] compat_readv+0xe3/0x150 [ 20.063792] [] do_compat_readv+0xf4/0x1d0 [ 20.069562] [] ? compat_readv+0x150/0x150 [ 20.075328] [] ? compat_SyS_sched_setaffinity+0xb7/0x110 [ 20.082403] [] ? compat_get_bitmap+0x1e0/0x1e0 [ 20.088604] [] compat_SyS_readv+0x26/0x30 [ 20.094378] [] ? SyS_pwritev2+0x80/0x80 [ 20.099980] [] do_fast_syscall_32+0x2f7/0x890 [ 20.106097] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 20.112731] [] entry_SYSENTER_compat+0x51/0x60 [ 20.118933] 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 [ 20.145381] RIP [] __free_pages+0x21/0x80 [ 20.151275] RSP [ 20.157558] ---[ end trace dd2a0473c4bb26b5 ]--- [ 20.162392] Kernel panic - not syncing: Fatal exception [ 20.168207] Dumping ftrace buffer: [ 20.171732] (ftrace buffer empty) [ 20.175425] Kernel Offset: disabled [ 20.179034] Rebooting in 86400 seconds..