[....] Starting enhanced syslogd: rsyslogd[ 10.632372] audit: type=1400 audit(1514751553.901:4): avc: denied { syslog } for pid=3171 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] 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 '10.128.0.56' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 18.679388] kasan: CONFIG_KASAN_INLINE enabled [ 18.680113] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 18.681117] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 18.681942] Dumping ftrace buffer: [ 18.682416] (ftrace buffer empty) [ 18.682908] Modules linked in: [ 18.683406] CPU: 1 PID: 3321 Comm: syzkaller301269 Not tainted 4.9.73-gf3f3457 #11 [ 18.684457] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 18.685686] task: ffff8801ca868000 task.stack: ffff8801c8f00000 [ 18.686517] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 18.687642] RSP: 0018:ffff8801c8f07a50 EFLAGS: 00010a07 [ 18.688376] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 18.689337] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 18.690286] RBP: ffff8801c8f07a60 R08: 0000000000000001 R09: 0000000000000000 [ 18.691250] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 18.692252] R13: 0000000000000020 R14: ffff8801c90aa100 R15: dffffc0000000000 [ 18.693203] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000008c70840 [ 18.694292] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 18.695063] CR2: 0000000020001000 CR3: 00000001cabd2000 CR4: 00000000001406e0 [ 18.696070] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 18.697036] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 18.697984] Stack: [ 18.698293] ffff8801ca868000 ffff8801c90aa258 ffff8801c8f07ac0 ffffffff82664fc1 [ 18.699446] ffff8801c90aa270 ffffed003921544b ffffed003921544e ffff8801c90aa268 [ 18.707266] dead4ead00000000 ffff8801c90aa240 0000000000000000 0000000000000000 [ 18.715217] Call Trace: [ 18.717775] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 18.724235] [] sg_finish_rem_req+0x2b5/0x340 [ 18.730257] [] sg_new_read.isra.20+0x39/0x3e0 [ 18.736366] [] ? sg_get_rq_mark+0x142/0x190 [ 18.742300] [] sg_read+0x8bd/0x1440 [ 18.747540] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 18.754172] [] ? lru_cache_add+0xd9/0x1e0 [ 18.759938] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 18.767002] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 18.773633] [] __vfs_read+0x103/0x670 [ 18.779049] [] ? default_llseek+0x290/0x290 [ 18.784986] [] ? fsnotify+0x86/0xf30 [ 18.790315] [] ? fsnotify+0xf30/0xf30 [ 18.795729] [] ? avc_policy_seqno+0x9/0x20 [ 18.801579] [] ? selinux_file_permission+0x82/0x460 [ 18.808212] [] ? security_file_permission+0x89/0x1e0 [ 18.814933] [] ? rw_verify_area+0xe5/0x2b0 [ 18.820783] [] vfs_read+0x11e/0x380 [ 18.826026] [] SyS_read+0xd9/0x1b0 [ 18.831185] [] ? vfs_copy_file_range+0x740/0x740 [ 18.837555] [] ? do_fast_syscall_32+0xcf/0x890 [ 18.843757] [] ? vfs_copy_file_range+0x740/0x740 [ 18.850140] [] do_fast_syscall_32+0x2f7/0x890 [ 18.856251] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 18.862883] [] entry_SYSENTER_compat+0x51/0x60 [ 18.869074] 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 [ 18.895316] RIP [] __free_pages+0x21/0x80 [ 18.901195] RSP [ 18.904986] ---[ end trace f8149cc82bce8fe6 ]--- [ 18.909742] Kernel panic - not syncing: Fatal exception [ 18.915552] Dumping ftrace buffer: [ 18.919057] (ftrace buffer empty) [ 18.922734] Kernel Offset: disabled [ 18.926328] Rebooting in 86400 seconds..