[....] Starting enhanced syslogd: rsyslogd[ 10.692464] audit: type=1400 audit(1514755368.985:4): 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 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 '10.128.0.41' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.380378] kasan: CONFIG_KASAN_INLINE enabled [ 27.381153] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.382260] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.383224] Dumping ftrace buffer: [ 27.383700] (ftrace buffer empty) [ 27.384239] Modules linked in: [ 27.384752] CPU: 1 PID: 3325 Comm: syzkaller026984 Not tainted 4.9.73-gf3f3457 #11 [ 27.385814] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.387081] task: ffff8801cafde000 task.stack: ffff8801d02e0000 [ 27.387880] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 27.389007] RSP: 0018:ffff8801d02e7a50 EFLAGS: 00010a07 [ 27.389738] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 27.390693] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.391646] RBP: ffff8801d02e7a60 R08: 0000000000000001 R09: 0000000000000000 [ 27.392627] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.393620] R13: 0000000000000020 R14: ffff8801c89a2100 R15: dffffc0000000000 [ 27.394611] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009541840 [ 27.395685] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.396461] CR2: 0000000020001000 CR3: 00000001ca535000 CR4: 00000000001406e0 [ 27.397415] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.398406] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.399357] Stack: [ 27.399659] ffff8801cafde000 ffff8801c89a2258 ffff8801d02e7ac0 ffffffff82664fc1 [ 27.402416] ffff8801c89a2270 ffffed003913444b ffffed003913444e ffff8801c89a2268 [ 27.412219] dead4ead00000000 ffff8801c89a2240 0000000000000000 0000000000000000 [ 27.420192] Call Trace: [ 27.422759] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 27.429223] [] sg_finish_rem_req+0x2b5/0x340 [ 27.435250] [] sg_new_read.isra.20+0x39/0x3e0 [ 27.441366] [] ? sg_get_rq_mark+0x142/0x190 [ 27.447313] [] sg_read+0x8bd/0x1440 [ 27.452563] [] ? save_stack_trace+0x16/0x20 [ 27.458510] [] ? save_stack+0x43/0xd0 [ 27.463929] [] ? kasan_slab_free+0x72/0xc0 [ 27.470131] [] ? kmem_cache_free+0xc7/0x300 [ 27.476086] [] ? putname+0xee/0x130 [ 27.481336] [] ? do_sys_open+0x252/0x4c0 [ 27.487714] [] ? do_fast_syscall_32+0x2f7/0x890 [ 27.494010] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 27.500657] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 27.507470] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 27.514368] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 27.521093] [] __vfs_read+0x103/0x670 [ 27.526518] [] ? default_llseek+0x290/0x290 [ 27.532465] [] ? fsnotify+0x86/0xf30 [ 27.537916] [] ? fsnotify+0xf30/0xf30 [ 27.543334] [] ? avc_policy_seqno+0x9/0x20 [ 27.549188] [] ? selinux_file_permission+0x82/0x460 [ 27.555831] [] ? security_file_permission+0x89/0x1e0 [ 27.562567] [] ? rw_verify_area+0xe5/0x2b0 [ 27.568423] [] vfs_read+0x11e/0x380 [ 27.573669] [] SyS_read+0xd9/0x1b0 [ 27.578846] [] ? vfs_copy_file_range+0x740/0x740 [ 27.585223] [] ? do_fast_syscall_32+0xcf/0x890 [ 27.591436] [] ? vfs_copy_file_range+0x740/0x740 [ 27.597814] [] do_fast_syscall_32+0x2f7/0x890 [ 27.603935] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.610571] [] entry_SYSENTER_compat+0x51/0x60 [ 27.616769] 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 [ 27.643249] RIP [] __free_pages+0x21/0x80 [ 27.649494] RSP [ 27.653461] ---[ end trace 6a0bc23b3bb499ac ]--- [ 27.658238] Kernel panic - not syncing: Fatal exception [ 27.663949] Dumping ftrace buffer: [ 27.667470] (ftrace buffer empty) [ 27.671149] Kernel Offset: disabled [ 27.674746] Rebooting in 86400 seconds..