[....] Starting enhanced syslogd: rsyslogd[ 12.576529] audit: type=1400 audit(1514774751.587:4): avc: denied { syslog } for pid=3158 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 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 '10.128.0.2' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 24.209094] kasan: CONFIG_KASAN_INLINE enabled [ 24.213689] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 24.221151] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 24.227356] Dumping ftrace buffer: [ 24.230860] (ftrace buffer empty) [ 24.234534] Modules linked in: [ 24.237803] CPU: 0 PID: 3314 Comm: syzkaller992121 Not tainted 4.9.73-gf3f3457 #11 [ 24.245476] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.254794] task: ffff8801cac3b000 task.stack: ffff8801c8a98000 [ 24.260811] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 24.269035] RSP: 0018:ffff8801c8a9fa50 EFLAGS: 00010a07 [ 24.274444] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 24.281676] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 24.288909] RBP: ffff8801c8a9fa60 R08: 0000000000000001 R09: 0000000000000000 [ 24.296142] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 24.303375] R13: 0000000000000020 R14: ffff8801c9040000 R15: dffffc0000000000 [ 24.310612] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000093a3840 [ 24.318813] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 24.324656] CR2: 0000000020001000 CR3: 00000001c9448000 CR4: 00000000001406f0 [ 24.331891] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.339124] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.346355] Stack: [ 24.348467] ffff8801cac3b000 ffff8801c9040158 ffff8801c8a9fac0 ffffffff82664fc1 [ 24.356473] ffff8801c9040170 ffffed003920802b ffffed003920802e ffff8801c9040168 [ 24.364411] dead4ead00000000 ffff8801c9040140 0000000000000000 0000000000000000 [ 24.372345] Call Trace: [ 24.374900] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 24.381358] [] sg_finish_rem_req+0x2b5/0x340 [ 24.387377] [] sg_new_read.isra.20+0x39/0x3e0 [ 24.393486] [] ? sg_get_rq_mark+0x142/0x190 [ 24.399421] [] sg_read+0x8bd/0x1440 [ 24.404661] [] ? save_stack_trace+0x16/0x20 [ 24.410595] [] ? save_stack+0x43/0xd0 [ 24.416007] [] ? kasan_slab_free+0x72/0xc0 [ 24.421852] [] ? kmem_cache_free+0xc7/0x300 [ 24.427786] [] ? putname+0xee/0x130 [ 24.433026] [] ? do_sys_open+0x252/0x4c0 [ 24.438701] [] ? do_fast_syscall_32+0x2f7/0x890 [ 24.444981] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.451613] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 24.458416] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 24.465305] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.471931] [] __vfs_read+0x103/0x670 [ 24.477343] [] ? default_llseek+0x290/0x290 [ 24.483276] [] ? fsnotify+0x86/0xf30 [ 24.488601] [] ? fsnotify+0xf30/0xf30 [ 24.494014] [] ? avc_policy_seqno+0x9/0x20 [ 24.499861] [] ? selinux_file_permission+0x82/0x460 [ 24.506489] [] ? security_file_permission+0x89/0x1e0 [ 24.513206] [] ? rw_verify_area+0xe5/0x2b0 [ 24.519051] [] vfs_read+0x11e/0x380 [ 24.524291] [] SyS_read+0xd9/0x1b0 [ 24.529442] [] ? vfs_copy_file_range+0x740/0x740 [ 24.535810] [] ? do_fast_syscall_32+0xcf/0x890 [ 24.542004] [] ? vfs_copy_file_range+0x740/0x740 [ 24.548371] [] do_fast_syscall_32+0x2f7/0x890 [ 24.554486] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.561115] [] entry_SYSENTER_compat+0x51/0x60 [ 24.567305] 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 [ 24.593567] RIP [] __free_pages+0x21/0x80 [ 24.599439] RSP [ 24.603535] ---[ end trace 56b9a51251967bf2 ]--- [ 24.608372] Kernel panic - not syncing: Fatal exception [ 24.614142] Dumping ftrace buffer: [ 24.617647] (ftrace buffer empty) [ 24.621321] Kernel Offset: disabled [ 24.624910] Rebooting in 86400 seconds..