[....] Starting enhanced syslogd: rsyslogd[ 12.743929] audit: type=1400 audit(1514401354.080:4): avc: denied { syslog } for pid=3174 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 '10.128.15.248' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 33.560650] kasan: CONFIG_KASAN_INLINE enabled [ 33.565259] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 33.572748] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.578951] Dumping ftrace buffer: [ 33.582460] (ftrace buffer empty) [ 33.586139] Modules linked in: [ 33.589413] CPU: 0 PID: 3339 Comm: syzkaller052964 Not tainted 4.9.72-gcb7518e #10 [ 33.597083] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.606404] task: ffff8801cb33c800 task.stack: ffff8801c8438000 [ 33.612424] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 33.620652] RSP: 0018:ffff8801c843fa50 EFLAGS: 00010a07 [ 33.626066] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 33.633817] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 33.641059] RBP: ffff8801c843fa60 R08: 0000000000000001 R09: 0000000000000000 [ 33.648298] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 33.655534] R13: 0000000000000020 R14: ffff8801c9748000 R15: dffffc0000000000 [ 33.662772] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008fe4840 [ 33.670965] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.676814] CR2: 0000000020002000 CR3: 00000001c97da000 CR4: 00000000001406f0 [ 33.684051] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.691290] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.698524] Stack: [ 33.700641] ffff8801cb33c800 ffff8801c9748158 ffff8801c843fac0 ffffffff82664fc1 [ 33.708585] ffff8801c9748170 ffffed00392e902b ffffed00392e902e ffff8801c9748168 [ 33.716544] dead4ead00000000 ffff8801c9748140 0000000000000000 0000000000000000 [ 33.724492] Call Trace: [ 33.727066] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 33.733526] [] sg_finish_rem_req+0x2b5/0x340 [ 33.740158] [] sg_new_read.isra.20+0x39/0x3e0 [ 33.746355] [] ? sg_get_rq_mark+0x142/0x190 [ 33.752291] [] sg_read+0x8bd/0x1440 [ 33.757532] [] ? save_stack_trace+0x16/0x20 [ 33.763472] [] ? save_stack+0x43/0xd0 [ 33.768890] [] ? kasan_slab_free+0x72/0xc0 [ 33.774740] [] ? kmem_cache_free+0xc7/0x300 [ 33.780679] [] ? putname+0xee/0x130 [ 33.785924] [] ? do_sys_open+0x252/0x4c0 [ 33.791601] [] ? do_fast_syscall_32+0x2f7/0x890 [ 33.797888] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 33.804527] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 33.811336] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 33.818246] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 33.824882] [] __vfs_read+0x103/0x670 [ 33.830301] [] ? default_llseek+0x290/0x290 [ 33.836252] [] ? fsnotify+0x86/0xf30 [ 33.841582] [] ? fsnotify+0xf30/0xf30 [ 33.847005] [] ? avc_policy_seqno+0x9/0x20 [ 33.852858] [] ? selinux_file_permission+0x82/0x460 [ 33.859490] [] ? security_file_permission+0x89/0x1e0 [ 33.866207] [] ? rw_verify_area+0xe5/0x2b0 [ 33.872061] [] vfs_read+0x11e/0x380 [ 33.877310] [] SyS_read+0xd9/0x1b0 [ 33.882466] [] ? vfs_copy_file_range+0x740/0x740 [ 33.888838] [] ? do_fast_syscall_32+0xcf/0x890 [ 33.895036] [] ? vfs_copy_file_range+0x740/0x740 [ 33.901407] [] do_fast_syscall_32+0x2f7/0x890 [ 33.907519] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.914152] [] entry_SYSENTER_compat+0x51/0x60 [ 33.920348] 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 [ 33.946666] RIP [] __free_pages+0x21/0x80 [ 33.953073] RSP [ 33.956966] ---[ end trace 1a8f60e65312517c ]--- [ 33.961706] Kernel panic - not syncing: Fatal exception [ 33.967394] Dumping ftrace buffer: [ 33.971898] (ftrace buffer empty) [ 33.975838] Kernel Offset: disabled [ 33.979434] Rebooting in 86400 seconds..