[....] Starting enhanced syslogd: rsyslogd[ 12.692101] audit: type=1400 audit(1514702269.313:4): avc: denied { syslog } for pid=3170 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 '10.128.0.47' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.283200] kasan: CONFIG_KASAN_INLINE enabled [ 26.287782] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.295592] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.301792] Dumping ftrace buffer: [ 26.305298] (ftrace buffer empty) [ 26.308976] Modules linked in: [ 26.312251] CPU: 0 PID: 3333 Comm: syzkaller413537 Not tainted 4.9.73-gf3f3457 #11 [ 26.319919] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.329236] task: ffff8801cbf9c800 task.stack: ffff8801c0af0000 [ 26.335255] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 26.343480] RSP: 0018:ffff8801c0af7a50 EFLAGS: 00010a07 [ 26.348890] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 26.356124] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.363374] RBP: ffff8801c0af7a60 R08: 0000000000000001 R09: 0000000000000000 [ 26.370610] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 26.377844] R13: 0000000000000020 R14: ffff8801c94d2100 R15: dffffc0000000000 [ 26.385084] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:000000000a028840 [ 26.393275] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 26.399120] CR2: 0000000020001000 CR3: 00000001ccc9e000 CR4: 00000000001406f0 [ 26.406361] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.413596] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.420828] Stack: [ 26.422943] ffff8801cbf9c800 ffff8801c94d2258 ffff8801c0af7ac0 ffffffff82664fc1 [ 26.430885] ffff8801c94d2270 ffffed003929a44b ffffed003929a44e ffff8801c94d2268 [ 26.438831] dead4ead00000000 ffff8801c94d2240 0000000000000000 0000000000000000 [ 26.446772] Call Trace: [ 26.449324] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 26.455781] [] sg_finish_rem_req+0x2b5/0x340 [ 26.461801] [] sg_new_read.isra.20+0x39/0x3e0 [ 26.467908] [] ? sg_get_rq_mark+0x142/0x190 [ 26.473855] [] sg_read+0x8bd/0x1440 [ 26.479109] [] ? save_stack_trace+0x16/0x20 [ 26.485052] [] ? save_stack+0x43/0xd0 [ 26.490471] [] ? kasan_slab_free+0x72/0xc0 [ 26.496321] [] ? kmem_cache_free+0xc7/0x300 [ 26.502258] [] ? putname+0xee/0x130 [ 26.507502] [] ? do_sys_open+0x252/0x4c0 [ 26.513178] [] ? do_fast_syscall_32+0x2f7/0x890 [ 26.519462] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 26.526094] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 26.532900] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 26.539789] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 26.546418] [] __vfs_read+0x103/0x670 [ 26.551834] [] ? default_llseek+0x290/0x290 [ 26.557770] [] ? fsnotify+0x86/0xf30 [ 26.563095] [] ? fsnotify+0xf30/0xf30 [ 26.568510] [] ? avc_policy_seqno+0x9/0x20 [ 26.574358] [] ? selinux_file_permission+0x82/0x460 [ 26.580997] [] ? security_file_permission+0x89/0x1e0 [ 26.587712] [] ? rw_verify_area+0xe5/0x2b0 [ 26.593560] [] vfs_read+0x11e/0x380 [ 26.598799] [] SyS_read+0xd9/0x1b0 [ 26.603952] [] ? vfs_copy_file_range+0x740/0x740 [ 26.610318] [] ? do_fast_syscall_32+0xcf/0x890 [ 26.616511] [] ? vfs_copy_file_range+0x740/0x740 [ 26.622876] [] do_fast_syscall_32+0x2f7/0x890 [ 26.628986] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.635614] [] entry_SYSENTER_compat+0x51/0x60 [ 26.641805] 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 [ 26.668089] RIP [] __free_pages+0x21/0x80 [ 26.673970] RSP [ 26.678030] ---[ end trace 962faed4f010df8a ]--- [ 26.682834] Kernel panic - not syncing: Fatal exception [ 26.688550] Dumping ftrace buffer: [ 26.692059] (ftrace buffer empty) [ 26.695731] Kernel Offset: disabled [ 26.699321] Rebooting in 86400 seconds..