[....] Starting enhanced syslogd: rsyslogd[ 14.197156] audit: type=1400 audit(1515404959.957:4): avc: denied { syslog } for pid=3186 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 '10.128.15.211' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.623676] kasan: CONFIG_KASAN_INLINE enabled [ 27.628299] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.635643] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.641848] Dumping ftrace buffer: [ 27.645350] (ftrace buffer empty) [ 27.649025] Modules linked in: [ 27.652293] CPU: 0 PID: 3342 Comm: syzkaller301949 Not tainted 4.9.75-g5f5e5d4 #17 [ 27.659966] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.669292] task: ffff8801c9531800 task.stack: ffff8801c84f0000 [ 27.675321] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 27.683549] RSP: 0018:ffff8801c84f7940 EFLAGS: 00010a07 [ 27.688960] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266631b [ 27.696196] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.703429] RBP: ffff8801c84f7950 R08: 0000000000000001 R09: 0000000000000000 [ 27.710676] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.717919] R13: 0000000000000020 R14: ffff8801caa74200 R15: dffffc0000000000 [ 27.725155] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:000000000887b840 [ 27.733352] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.739197] CR2: 0000000020ef0fe0 CR3: 00000001c945a000 CR4: 0000000000160670 [ 27.746436] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.753672] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.760911] Stack: [ 27.763028] ffff8801c9531800 ffff8801caa74358 ffff8801c84f79b0 ffffffff82666341 [ 27.770978] ffff8801caa74370 ffffed003954e86b ffffed003954e86e ffff8801caa74368 [ 27.778922] dead4ead00000000 ffff8801caa74340 0000000000000000 0000000000000000 [ 27.786865] Call Trace: [ 27.789422] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 27.795878] [] sg_finish_rem_req+0x2b5/0x340 [ 27.801898] [] sg_new_read.isra.20+0x39/0x3e0 [ 27.808011] [] ? sg_get_rq_mark+0x142/0x190 [ 27.813943] [] sg_read+0x8bd/0x1440 [ 27.819185] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 27.825814] [] ? fsnotify+0xf30/0xf30 [ 27.831230] [] ? avc_policy_seqno+0x9/0x20 [ 27.837080] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 27.844058] [] ? security_file_permission+0x89/0x1e0 [ 27.850778] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 27.857409] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 27.864039] [] compat_do_readv_writev+0x522/0x760 [ 27.870494] [] ? do_pwritev+0x1a0/0x1a0 [ 27.876817] [] ? __lru_cache_add+0x187/0x250 [ 27.882853] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.888796] [] ? handle_mm_fault+0x6ee/0x2530 [ 27.894909] [] ? __pmd_alloc+0x410/0x410 [ 27.900591] [] compat_readv+0xe3/0x150 [ 27.906092] [] do_compat_readv+0xf4/0x1d0 [ 27.911859] [] ? compat_readv+0x150/0x150 [ 27.917623] [] compat_SyS_readv+0x26/0x30 [ 27.923381] [] ? SyS_pwritev2+0x80/0x80 [ 27.928972] [] do_fast_syscall_32+0x2f7/0x890 [ 27.935078] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.941708] [] entry_SYSENTER_compat+0x74/0x83 [ 27.947903] 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 [ 27.974394] RIP [] __free_pages+0x21/0x80 [ 27.980273] RSP [ 27.984164] ---[ end trace c86378241263d448 ]--- [ 27.988975] Kernel panic - not syncing: Fatal exception [ 27.994768] Dumping ftrace buffer: [ 27.998277] (ftrace buffer empty) [ 28.001952] Kernel Offset: disabled [ 28.005551] Rebooting in 86400 seconds..