[....] Starting enhanced syslogd: rsyslogd[ 10.856090] audit: type=1400 audit(1514546226.667:4): avc: denied { syslog } for pid=3177 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 '10.128.15.239' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.928588] kasan: CONFIG_KASAN_INLINE enabled [ 19.929323] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.930291] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.931145] Dumping ftrace buffer: [ 19.931628] (ftrace buffer empty) [ 19.932125] Modules linked in: [ 19.932616] CPU: 1 PID: 3326 Comm: syzkaller141000 Not tainted 4.9.72-gcb7518e #10 [ 19.933642] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.934874] task: ffff8801cb9d6000 task.stack: ffff8801c9a20000 [ 19.935678] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.936783] RSP: 0018:ffff8801c9a27a50 EFLAGS: 00010a07 [ 19.937513] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 19.938512] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 19.939473] RBP: ffff8801c9a27a60 R08: 0000000000000001 R09: 0000000000000000 [ 19.940422] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 19.941420] R13: 0000000000000020 R14: ffff8801c8280000 R15: dffffc0000000000 [ 19.942399] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009201840 [ 19.943493] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 19.944286] CR2: 0000000020001000 CR3: 00000001cb25b000 CR4: 00000000001406e0 [ 19.945258] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.946207] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.947171] Stack: [ 19.947466] ffff8801cb9d6000 ffff8801c8280158 ffff8801c9a27ac0 ffffffff82664fc1 [ 19.948593] ffff8801c8280170 ffffed003905002b ffffed003905002e ffff8801c8280168 [ 19.956023] dead4ead00000000 ffff8801c8280140 0000000000000000 0000000000000000 [ 19.963970] Call Trace: [ 19.966530] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.972987] [] sg_finish_rem_req+0x2b5/0x340 [ 19.979009] [] sg_new_read.isra.20+0x39/0x3e0 [ 19.985119] [] ? sg_get_rq_mark+0x142/0x190 [ 19.991055] [] sg_read+0x8bd/0x1440 [ 19.996298] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.002937] [] ? lru_cache_add+0xd9/0x1e0 [ 20.008701] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 20.015857] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.022490] [] __vfs_read+0x103/0x670 [ 20.027911] [] ? default_llseek+0x290/0x290 [ 20.033854] [] ? fsnotify+0x86/0xf30 [ 20.039189] [] ? fsnotify+0xf30/0xf30 [ 20.044604] [] ? avc_policy_seqno+0x9/0x20 [ 20.050456] [] ? selinux_file_permission+0x82/0x460 [ 20.057086] [] ? security_file_permission+0x89/0x1e0 [ 20.063805] [] ? rw_verify_area+0xe5/0x2b0 [ 20.069654] [] vfs_read+0x11e/0x380 [ 20.074904] [] SyS_read+0xd9/0x1b0 [ 20.080061] [] ? vfs_copy_file_range+0x740/0x740 [ 20.086436] [] ? do_fast_syscall_32+0xcf/0x890 [ 20.092640] [] ? vfs_copy_file_range+0x740/0x740 [ 20.099010] [] do_fast_syscall_32+0x2f7/0x890 [ 20.105121] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 20.111751] [] entry_SYSENTER_compat+0x51/0x60 [ 20.117948] 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 [ 20.144239] RIP [] __free_pages+0x21/0x80 [ 20.150118] RSP [ 20.154091] ---[ end trace 9e7d6b28f75caca9 ]--- [ 20.158831] Kernel panic - not syncing: Fatal exception [ 20.164249] Dumping ftrace buffer: [ 20.167760] (ftrace buffer empty) [ 20.171438] Kernel Offset: disabled [ 20.175029] Rebooting in 86400 seconds..