[....] Starting enhanced syslogd: rsyslogd[ 12.728666] audit: type=1400 audit(1515675987.129:4): avc: denied { syslog } for pid=3165 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 '10.128.0.45' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.698484] kasan: CONFIG_KASAN_INLINE enabled [ 27.703071] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.710449] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.716657] Dumping ftrace buffer: [ 27.720161] (ftrace buffer empty) [ 27.723835] Modules linked in: [ 27.727103] CPU: 1 PID: 3328 Comm: syzkaller291864 Not tainted 4.9.76-g9154940 #20 [ 27.734778] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.744104] task: ffff8801ca0c1800 task.stack: ffff8801c7ca0000 [ 27.750123] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 27.758349] RSP: 0018:ffff8801c7ca7940 EFLAGS: 00010a07 [ 27.763763] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266640b [ 27.770997] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.778230] RBP: ffff8801c7ca7950 R08: 0000000000000001 R09: 0000000000000000 [ 27.785465] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.792700] R13: 0000000000000020 R14: ffff8801c962a100 R15: dffffc0000000000 [ 27.799936] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009f0a840 [ 27.808136] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.813983] CR2: 0000000020ef0fe0 CR3: 00000001c9f0e000 CR4: 0000000000160670 [ 27.821219] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.828454] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.835694] Stack: [ 27.837809] ffff8801ca0c1800 ffff8801c962a258 ffff8801c7ca79b0 ffffffff82666431 [ 27.845752] ffff8801c962a270 ffffed00392c544b ffffed00392c544e ffff8801c962a268 [ 27.853709] dead4ead00000000 ffff8801c962a240 0000000000000000 0000000000000000 [ 27.861649] Call Trace: [ 27.864209] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 27.870682] [] sg_finish_rem_req+0x2b5/0x340 [ 27.876706] [] sg_new_read.isra.20+0x39/0x3e0 [ 27.882826] [] ? sg_get_rq_mark+0x142/0x190 [ 27.888766] [] sg_read+0x8bd/0x1440 [ 27.894007] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 27.900636] [] ? fsnotify+0xf30/0xf30 [ 27.906052] [] ? avc_policy_seqno+0x9/0x20 [ 27.911899] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 27.918876] [] ? security_file_permission+0x89/0x1e0 [ 27.925591] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 27.932222] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 27.938853] [] compat_do_readv_writev+0x522/0x760 [ 27.945309] [] ? do_pwritev+0x1a0/0x1a0 [ 27.950897] [] ? __lru_cache_add+0x187/0x250 [ 27.956931] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.962866] [] ? handle_mm_fault+0x6ee/0x2530 [ 27.968972] [] ? __pmd_alloc+0x410/0x410 [ 27.974653] [] compat_readv+0xe3/0x150 [ 27.980155] [] do_compat_readv+0xf4/0x1d0 [ 27.985916] [] ? compat_readv+0x150/0x150 [ 27.991679] [] compat_SyS_readv+0x26/0x30 [ 27.997438] [] ? SyS_pwritev2+0x80/0x80 [ 28.003025] [] do_fast_syscall_32+0x2f7/0x890 [ 28.009134] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.015766] [] entry_SYSENTER_compat+0x74/0x83 [ 28.021957] 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 [ 28.048236] RIP [] __free_pages+0x21/0x80 [ 28.054115] RSP [ 28.058008] ---[ end trace 55c192baed306d1d ]--- [ 28.062749] Kernel panic - not syncing: Fatal exception [ 28.068523] Dumping ftrace buffer: [ 28.072030] (ftrace buffer empty) [ 28.075705] Kernel Offset: disabled [ 28.079294] Rebooting in 86400 seconds..