[ 14.178169] audit: type=1400 audit(1518358588.999:4): avc: denied { syslog } for pid=3630 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.50' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 24.990391] kasan: CONFIG_KASAN_INLINE enabled [ 24.994998] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 25.002537] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 25.008748] Dumping ftrace buffer: [ 25.012257] (ftrace buffer empty) [ 25.015935] Modules linked in: [ 25.019211] CPU: 1 PID: 3793 Comm: syzkaller902217 Not tainted 4.9.80-g8a174b47 #31 [ 25.026967] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.036290] task: ffff8801d81eb000 task.stack: ffff8801d8bd0000 [ 25.042311] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 25.050544] RSP: 0018:ffff8801d8bd7ab0 EFLAGS: 00010a07 [ 25.055957] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826680eb [ 25.063198] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 25.070440] RBP: ffff8801d8bd7ac0 R08: 0000000000000001 R09: 0000000000000000 [ 25.077680] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 25.084918] R13: 0000000000000020 R14: ffff8801d4790000 R15: dffffc0000000000 [ 25.092157] FS: 00000000019d7880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 25.100361] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.106210] CR2: 0000000020a2f000 CR3: 00000001d9806000 CR4: 0000000000160670 [ 25.113450] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.120687] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.127934] Stack: [ 25.130051] ffff8801d81eb000 ffff8801d4790158 ffff8801d8bd7b20 ffffffff82668111 [ 25.138013] ffff8801d4790170 ffffed003a8f202b ffffed003a8f202e ffff8801d4790168 [ 25.145976] dead4ead00000000 ffff8801d4790140 0000000000000000 0000000000000000 [ 25.153938] Call Trace: [ 25.156496] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 25.162953] [] sg_finish_rem_req+0x2b5/0x340 [ 25.168977] [] sg_new_read.isra.20+0x39/0x3e0 [ 25.175089] [] ? sg_get_rq_mark+0x142/0x190 [ 25.181025] [] sg_read+0x8b7/0x1440 [ 25.186270] [] ? __lru_cache_add+0x187/0x250 [ 25.192302] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 25.198937] [] ? _raw_spin_unlock+0x2c/0x50 [ 25.204876] [] ? do_huge_pmd_anonymous_page+0x2d4/0x10d0 [ 25.211944] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 25.218576] [] __vfs_read+0x103/0x670 [ 25.223995] [] ? default_llseek+0x290/0x290 [ 25.229935] [] ? fsnotify+0x86/0xf30 [ 25.235271] [] ? fsnotify+0xf30/0xf30 [ 25.240694] [] ? avc_policy_seqno+0x9/0x20 [ 25.246548] [] ? selinux_file_permission+0x82/0x460 [ 25.253180] [] ? security_file_permission+0x89/0x1e0 [ 25.259902] [] ? rw_verify_area+0xe5/0x2b0 [ 25.265756] [] vfs_read+0x11e/0x380 [ 25.271000] [] SyS_read+0xd9/0x1b0 [ 25.276157] [] ? vfs_copy_file_range+0x740/0x740 [ 25.282535] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 25.289341] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.295890] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 25.302433] 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 [ 25.328990] RIP [] __free_pages+0x21/0x80 [ 25.334869] RSP [ 25.338712] ---[ end trace c60d3fe8f327a351 ]--- [ 25.343449] Kernel panic - not syncing: Fatal exception [ 25.349157] Dumping ftrace buffer: [ 25.352677] (ftrace buffer empty) [ 25.356358] Kernel Offset: disabled [ 25.359954] Rebooting in 86400 seconds..