[....] Starting enhanced syslogd: rsyslogd[ 10.208871] audit: type=1400 audit(1514601714.249:4): avc: denied { syslog } for pid=3168 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 periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.22' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 18.796638] kasan: CONFIG_KASAN_INLINE enabled [ 18.797322] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 18.798328] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 18.799170] Dumping ftrace buffer: [ 18.799641] (ftrace buffer empty) [ 18.800134] Modules linked in: [ 18.800601] CPU: 0 PID: 3322 Comm: syzkaller724196 Not tainted 4.9.73-gf3f3457 #11 [ 18.801609] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 18.802840] task: ffff8801ca8e3000 task.stack: ffff8801cb130000 [ 18.803633] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 18.804742] RSP: 0018:ffff8801cb137aa0 EFLAGS: 00010a07 [ 18.805461] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 18.806413] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 18.807362] RBP: ffff8801cb137ab0 R08: ffffed00392e6100 R09: ffff8801c97307e0 [ 18.808332] R10: 0000000000000005 R11: ffffed00392e6100 R12: 0000000000000004 [ 18.809292] R13: 0000000000000020 R14: ffff8801c84b0000 R15: dffffc0000000000 [ 18.810242] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000087f0840 [ 18.811314] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 18.812111] CR2: 0000000020002000 CR3: 00000001cb159000 CR4: 00000000001406f0 [ 18.813064] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 18.814014] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 18.814966] Stack: [ 18.815261] 0000000000000000 ffff8801c84b0158 ffff8801cb137b10 ffffffff82664fc1 [ 18.816393] ffff8801c84b0170 ffffed003909602b ffffed003909602e ffff8801c84b0168 [ 18.822233] dead4ead00000000 ffff8801c84b0140 0000000000000000 0000000000000000 [ 18.830186] Call Trace: [ 18.832742] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 18.839195] [] sg_finish_rem_req+0x2b5/0x340 [ 18.845218] [] sg_read+0xa1c/0x1440 [ 18.850458] [] ? save_stack_trace+0x16/0x20 [ 18.856395] [] ? save_stack+0x43/0xd0 [ 18.861810] [] ? kasan_slab_free+0x72/0xc0 [ 18.867658] [] ? kmem_cache_free+0xc7/0x300 [ 18.873590] [] ? putname+0xee/0x130 [ 18.878833] [] ? do_sys_open+0x252/0x4c0 [ 18.884507] [] ? do_fast_syscall_32+0x2f7/0x890 [ 18.890789] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 18.897419] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 18.904225] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 18.911112] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 18.917741] [] __vfs_read+0x103/0x670 [ 18.923153] [] ? default_llseek+0x290/0x290 [ 18.929088] [] ? fsnotify+0x86/0xf30 [ 18.934414] [] ? fsnotify+0xf30/0xf30 [ 18.939827] [] ? avc_policy_seqno+0x9/0x20 [ 18.945677] [] ? selinux_file_permission+0x82/0x460 [ 18.952305] [] ? security_file_permission+0x89/0x1e0 [ 18.959021] [] ? rw_verify_area+0xe5/0x2b0 [ 18.964867] [] vfs_read+0x11e/0x380 [ 18.970107] [] SyS_read+0xd9/0x1b0 [ 18.975260] [] ? vfs_copy_file_range+0x740/0x740 [ 18.981627] [] ? do_fast_syscall_32+0xcf/0x890 [ 18.987822] [] ? vfs_copy_file_range+0x740/0x740 [ 18.994190] [] do_fast_syscall_32+0x2f7/0x890 [ 19.000297] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 19.006927] [] entry_SYSENTER_compat+0x51/0x60 [ 19.013118] 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 [ 19.039381] RIP [] __free_pages+0x21/0x80 [ 19.045264] RSP [ 19.048912] ---[ end trace 3233a69b2b4c6ab8 ]--- [ 19.053641] Kernel panic - not syncing: Fatal exception [ 19.059426] Dumping ftrace buffer: [ 19.062935] (ftrace buffer empty) [ 19.066611] Kernel Offset: disabled [ 19.070201] Rebooting in 86400 seconds..