[....] Starting enhanced syslogd: rsyslogd[ 10.678723] audit: type=1400 audit(1514523374.652:4): avc: denied { syslog } for pid=3176 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 '10.128.15.223' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.136196] kasan: CONFIG_KASAN_INLINE enabled [ 19.136867] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.137833] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.138654] Dumping ftrace buffer: [ 19.139130] (ftrace buffer empty) [ 19.139625] Modules linked in: [ 19.140127] CPU: 0 PID: 3325 Comm: syzkaller687736 Not tainted 4.9.72-gcb7518e #10 [ 19.141132] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.142366] task: ffff8801ca6e3000 task.stack: ffff8801c8ee0000 [ 19.143212] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.144315] RSP: 0018:ffff8801c8ee7940 EFLAGS: 00010a07 [ 19.145034] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 19.146005] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 19.146970] RBP: ffff8801c8ee7950 R08: 0000000000000001 R09: 0000000000000000 [ 19.147922] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 19.148871] R13: 0000000000000020 R14: ffff8801c9dac200 R15: dffffc0000000000 [ 19.149821] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009653840 [ 19.150905] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 19.151693] CR2: 0000000020002000 CR3: 00000001ca5a0000 CR4: 00000000001406f0 [ 19.152658] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.153614] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.154564] Stack: [ 19.154858] ffff8801ca6e3000 ffff8801c9dac358 ffff8801c8ee79b0 ffffffff82664fc1 [ 19.155986] ffff8801c9dac370 ffffed00393b586b ffffed00393b586e ffff8801c9dac368 [ 19.161971] dead4ead00000000 ffff8801c9dac340 0000000000000000 0000000000000000 [ 19.169911] Call Trace: [ 19.172466] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.178930] [] sg_finish_rem_req+0x2b5/0x340 [ 19.184951] [] sg_new_read.isra.20+0x39/0x3e0 [ 19.191058] [] ? sg_get_rq_mark+0x142/0x190 [ 19.196999] [] sg_read+0x8bd/0x1440 [ 19.202240] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.208873] [] ? fsnotify+0xf30/0xf30 [ 19.214288] [] ? avc_policy_seqno+0x9/0x20 [ 19.220139] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 19.227115] [] ? security_file_permission+0x89/0x1e0 [ 19.233830] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.240456] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.247086] [] compat_do_readv_writev+0x522/0x760 [ 19.253546] [] ? do_pwritev+0x1a0/0x1a0 [ 19.259132] [] ? sg_ioctl+0x2c30/0x2c30 [ 19.264718] [] ? do_iter_readv_writev+0x400/0x400 [ 19.271174] [] ? __might_sleep+0x95/0x1a0 [ 19.276935] [] ? __fsnotify_parent+0xbc/0x340 [ 19.283044] [] ? avc_policy_seqno+0x9/0x20 [ 19.288889] [] ? fsnotify+0x86/0xf30 [ 19.294221] [] ? fsnotify+0xf30/0xf30 [ 19.299633] [] compat_readv+0xe3/0x150 [ 19.305134] [] do_compat_readv+0xf4/0x1d0 [ 19.310893] [] ? compat_readv+0x150/0x150 [ 19.316655] [] ? SyS_read+0x1b0/0x1b0 [ 19.322076] [] compat_SyS_readv+0x26/0x30 [ 19.327838] [] ? SyS_pwritev2+0x80/0x80 [ 19.333434] [] do_fast_syscall_32+0x2f7/0x890 [ 19.339539] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 19.346171] [] entry_SYSENTER_compat+0x51/0x60 [ 19.352363] 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 [ 19.378666] RIP [] __free_pages+0x21/0x80 [ 19.384543] RSP [ 19.390243] ---[ end trace f15b95d791e8d169 ]--- [ 19.395144] Kernel panic - not syncing: Fatal exception [ 19.400945] Dumping ftrace buffer: [ 19.404452] (ftrace buffer empty) [ 19.408129] Kernel Offset: disabled [ 19.411718] Rebooting in 86400 seconds..