[....] Starting enhanced syslogd: rsyslogd[ 13.266942] audit: type=1400 audit(1514782447.736:4): avc: denied { syslog } for pid=3179 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 '10.128.0.22' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 24.654211] kasan: CONFIG_KASAN_INLINE enabled [ 24.658816] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 24.666213] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 24.672411] Dumping ftrace buffer: [ 24.675912] (ftrace buffer empty) [ 24.679590] Modules linked in: [ 24.682860] CPU: 1 PID: 3334 Comm: syzkaller700079 Not tainted 4.9.73-gf3f3457 #11 [ 24.690536] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.699856] task: ffff8801ca2f0000 task.stack: ffff8801c89a8000 [ 24.705878] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 24.714104] RSP: 0018:ffff8801c89afa50 EFLAGS: 00010a07 [ 24.719517] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 24.726753] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 24.733986] RBP: ffff8801c89afa60 R08: 0000000000000001 R09: 0000000000000000 [ 24.741219] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 24.748455] R13: 0000000000000020 R14: ffff8801c9434200 R15: dffffc0000000000 [ 24.755689] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009ad6840 [ 24.763880] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 24.769730] CR2: 0000000020001000 CR3: 00000001c24a2000 CR4: 00000000001406e0 [ 24.776974] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.784209] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.791443] Stack: [ 24.793558] ffff8801ca2f0000 ffff8801c9434358 ffff8801c89afac0 ffffffff82664fc1 [ 24.801513] ffff8801c9434370 ffffed003928686b ffffed003928686e ffff8801c9434368 [ 24.809455] dead4ead00000000 ffff8801c9434340 0000000000000000 0000000000000000 [ 24.817402] Call Trace: [ 24.819962] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 24.826422] [] sg_finish_rem_req+0x2b5/0x340 [ 24.832449] [] sg_new_read.isra.20+0x39/0x3e0 [ 24.838570] [] ? sg_get_rq_mark+0x142/0x190 [ 24.844506] [] sg_read+0x8bd/0x1440 [ 24.849746] [] ? save_stack_trace+0x16/0x20 [ 24.855680] [] ? save_stack+0x43/0xd0 [ 24.861093] [] ? kasan_slab_free+0x72/0xc0 [ 24.866942] [] ? kmem_cache_free+0xc7/0x300 [ 24.872879] [] ? putname+0xee/0x130 [ 24.878119] [] ? do_sys_open+0x252/0x4c0 [ 24.883792] [] ? do_fast_syscall_32+0x2f7/0x890 [ 24.890075] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.896708] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 24.903515] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 24.910406] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.917038] [] __vfs_read+0x103/0x670 [ 24.922470] [] ? default_llseek+0x290/0x290 [ 24.928410] [] ? fsnotify+0x86/0xf30 [ 24.933741] [] ? fsnotify+0xf30/0xf30 [ 24.939167] [] ? avc_policy_seqno+0x9/0x20 [ 24.945020] [] ? selinux_file_permission+0x82/0x460 [ 24.951652] [] ? security_file_permission+0x89/0x1e0 [ 24.958369] [] ? rw_verify_area+0xe5/0x2b0 [ 24.964217] [] vfs_read+0x11e/0x380 [ 24.969455] [] SyS_read+0xd9/0x1b0 [ 24.974609] [] ? vfs_copy_file_range+0x740/0x740 [ 24.980979] [] ? do_fast_syscall_32+0xcf/0x890 [ 24.987172] [] ? vfs_copy_file_range+0x740/0x740 [ 24.993539] [] do_fast_syscall_32+0x2f7/0x890 [ 24.999660] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.006292] [] entry_SYSENTER_compat+0x51/0x60 [ 25.012486] 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 [ 25.038747] RIP [] __free_pages+0x21/0x80 [ 25.044622] RSP [ 25.048427] ---[ end trace 695d5f6365364c0b ]--- [ 25.053149] Kernel panic - not syncing: Fatal exception [ 25.058512] Dumping ftrace buffer: [ 25.062026] (ftrace buffer empty) [ 25.065702] Kernel Offset: disabled [ 25.069298] Rebooting in 86400 seconds..