[....] Starting enhanced syslogd: rsyslogd[ 10.265283] audit: type=1400 audit(1514448475.067:4): avc: denied { syslog } for pid=3175 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 '10.128.0.47' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 37.502456] kasan: CONFIG_KASAN_INLINE enabled [ 37.503232] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 37.504213] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 37.505042] Dumping ftrace buffer: [ 37.505517] (ftrace buffer empty) [ 37.506049] Modules linked in: [ 37.506531] CPU: 1 PID: 3347 Comm: syzkaller273978 Not tainted 4.9.72-gcb7518e #10 [ 37.507547] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.508892] task: ffff8801c0da3000 task.stack: ffff8801c8620000 [ 37.509741] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 37.510938] RSP: 0018:ffff8801c8627a50 EFLAGS: 00010a07 [ 37.511666] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 37.512619] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 37.513591] RBP: ffff8801c8627a60 R08: 0000000000000001 R09: 0000000000000000 [ 37.514605] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 37.515615] R13: 0000000000000020 R14: ffff8801c8ecc200 R15: dffffc0000000000 [ 37.516624] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000085f7840 [ 37.517711] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 37.518546] CR2: 0000000020002000 CR3: 00000001c86d3000 CR4: 00000000001406e0 [ 37.519515] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.520492] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.521440] Stack: [ 37.521735] ffff8801c0da3000 ffff8801c8ecc358 ffff8801c8627ac0 ffffffff82664fc1 [ 37.525260] ffff8801c8ecc370 ffffed00391d986b ffffed00391d986e ffff8801c8ecc368 [ 37.533223] dead4ead00000000 ffff8801c8ecc340 0000000000000000 0000000000000000 [ 37.541174] Call Trace: [ 37.543732] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 37.550188] [] sg_finish_rem_req+0x2b5/0x340 [ 37.556211] [] sg_new_read.isra.20+0x39/0x3e0 [ 37.562318] [] ? sg_get_rq_mark+0x142/0x190 [ 37.568250] [] sg_read+0x8bd/0x1440 [ 37.573490] [] ? save_stack_trace+0x16/0x20 [ 37.579426] [] ? save_stack+0x43/0xd0 [ 37.584840] [] ? kasan_slab_free+0x72/0xc0 [ 37.590689] [] ? kmem_cache_free+0xc7/0x300 [ 37.596626] [] ? putname+0xee/0x130 [ 37.601879] [] ? do_sys_open+0x252/0x4c0 [ 37.607563] [] ? do_fast_syscall_32+0x2f7/0x890 [ 37.613846] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 37.620480] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 37.627299] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 37.634199] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 37.640836] [] __vfs_read+0x103/0x670 [ 37.646255] [] ? default_llseek+0x290/0x290 [ 37.652194] [] ? fsnotify+0x86/0xf30 [ 37.657524] [] ? fsnotify+0xf30/0xf30 [ 37.662941] [] ? avc_policy_seqno+0x9/0x20 [ 37.668807] [] ? selinux_file_permission+0x82/0x460 [ 37.675442] [] ? security_file_permission+0x89/0x1e0 [ 37.682160] [] ? rw_verify_area+0xe5/0x2b0 [ 37.688011] [] vfs_read+0x11e/0x380 [ 37.693254] [] SyS_read+0xd9/0x1b0 [ 37.698425] [] ? vfs_copy_file_range+0x740/0x740 [ 37.704799] [] ? do_fast_syscall_32+0xcf/0x890 [ 37.711005] [] ? vfs_copy_file_range+0x740/0x740 [ 37.717379] [] do_fast_syscall_32+0x2f7/0x890 [ 37.723500] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.730138] [] entry_SYSENTER_compat+0x51/0x60 [ 37.736336] 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 [ 37.762713] RIP [] __free_pages+0x21/0x80 [ 37.768596] RSP [ 37.772508] ---[ end trace bb9937328d8bf215 ]--- [ 37.777239] Kernel panic - not syncing: Fatal exception [ 37.782620] Dumping ftrace buffer: [ 37.786126] (ftrace buffer empty) [ 37.789801] Kernel Offset: disabled [ 37.793395] Rebooting in 86400 seconds..