[....] Starting enhanced syslogd: rsyslogd[ 10.513941] audit: type=1400 audit(1515629368.658:4): 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 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 '10.128.15.215' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 28.553598] kasan: CONFIG_KASAN_INLINE enabled [ 28.554308] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.555314] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.556134] Dumping ftrace buffer: [ 28.556610] (ftrace buffer empty) [ 28.557104] Modules linked in: [ 28.557571] CPU: 0 PID: 3328 Comm: syzkaller175560 Not tainted 4.9.76-g9154940 #20 [ 28.558606] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.559912] task: ffff8801cbfe4800 task.stack: ffff8801c8eb8000 [ 28.560719] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 28.561830] RSP: 0018:ffff8801c8ebf940 EFLAGS: 00010a07 [ 28.562551] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266640b [ 28.563502] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.564452] RBP: ffff8801c8ebf950 R08: 0000000000000001 R09: 0000000000000000 [ 28.565414] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 28.566372] R13: 0000000000000020 R14: ffff8801c98fa100 R15: dffffc0000000000 [ 28.567357] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:000000000a0b6840 [ 28.568433] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.569206] CR2: 0000000020ef0fe0 CR3: 00000001c8cfe000 CR4: 0000000000160670 [ 28.570206] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.571168] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.572118] Stack: [ 28.572414] ffff8801cbfe4800 ffff8801c98fa258 ffff8801c8ebf9b0 ffffffff82666431 [ 28.573553] ffff8801c98fa270 ffffed003931f44b ffffed003931f44e ffff8801c98fa268 [ 28.580549] dead4ead00000000 ffff8801c98fa240 0000000000000000 0000000000000000 [ 28.588498] Call Trace: [ 28.591056] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 28.597514] [] sg_finish_rem_req+0x2b5/0x340 [ 28.603549] [] sg_new_read.isra.20+0x39/0x3e0 [ 28.609665] [] ? sg_get_rq_mark+0x142/0x190 [ 28.615605] [] sg_read+0x8bd/0x1440 [ 28.620850] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 28.627493] [] ? fsnotify+0xf30/0xf30 [ 28.632911] [] ? avc_policy_seqno+0x9/0x20 [ 28.638763] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 28.645754] [] ? security_file_permission+0x89/0x1e0 [ 28.652474] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 28.659118] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 28.665751] [] compat_do_readv_writev+0x522/0x760 [ 28.672221] [] ? do_pwritev+0x1a0/0x1a0 [ 28.677812] [] ? __lru_cache_add+0x187/0x250 [ 28.683840] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.689788] [] ? handle_mm_fault+0x6ee/0x2530 [ 28.695898] [] ? __pmd_alloc+0x410/0x410 [ 28.701575] [] compat_readv+0xe3/0x150 [ 28.707080] [] do_compat_readv+0xf4/0x1d0 [ 28.712846] [] ? compat_readv+0x150/0x150 [ 28.718615] [] compat_SyS_readv+0x26/0x30 [ 28.724378] [] ? SyS_pwritev2+0x80/0x80 [ 28.729970] [] do_fast_syscall_32+0x2f7/0x890 [ 28.736080] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.742713] [] entry_SYSENTER_compat+0x74/0x83 [ 28.748908] 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 [ 28.775242] RIP [] __free_pages+0x21/0x80 [ 28.781121] RSP [ 28.784897] ---[ end trace c6add2205ea1ff77 ]--- [ 28.789663] Kernel panic - not syncing: Fatal exception [ 28.795641] Dumping ftrace buffer: [ 28.799157] (ftrace buffer empty) [ 28.802833] Kernel Offset: disabled [ 28.806430] Rebooting in 86400 seconds..