[....] Starting enhanced syslogd: rsyslogd[ 11.195485] audit: type=1400 audit(1515879619.819:4): avc: denied { syslog } for pid=3173 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[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 22.587084] kasan: CONFIG_KASAN_INLINE enabled [ 22.589343] kasan: CONFIG_KASAN_INLINE enabled [ 22.589345] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 22.589352] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 22.589354] Dumping ftrace buffer: [ 22.589357] (ftrace buffer empty) [ 22.589359] Modules linked in: [ 22.589364] CPU: 0 PID: 3329 Comm: syzkaller082506 Not tainted 4.9.76-g8e170a5 #21 [ 22.589366] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.589369] task: ffff8801c9c38000 task.stack: ffff8801c8bd8000 [ 22.589380] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 22.589382] RSP: 0018:ffff8801c8bdf940 EFLAGS: 00010a07 [ 22.589384] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266640b [ 22.589387] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 22.589389] RBP: ffff8801c8bdf950 R08: 0000000000000001 R09: 0000000000000000 [ 22.589391] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 22.589393] R13: 0000000000000020 R14: ffff8801c91b0000 R15: dffffc0000000000 [ 22.589396] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000094b9900 [ 22.589398] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 22.589400] CR2: 000000002069b000 CR3: 00000001c9774000 CR4: 0000000000160670 [ 22.589405] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 22.589406] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 22.589407] Stack: [ 22.589414] ffff8801c9c38000 ffff8801c91b0158 ffff8801c8bdf9b0 ffffffff82666431 [ 22.589419] ffff8801c91b0170 ffffed003923602b ffffed003923602e ffff8801c91b0168 [ 22.589423] dead4ead00000000 ffff8801c91b0140 0000000000000000 0000000000000000 [ 22.589424] Call Trace: [ 22.589431] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 22.589435] [] sg_finish_rem_req+0x2b5/0x340 [ 22.589439] [] sg_new_read.isra.20+0x39/0x3e0 [ 22.589442] [] ? sg_get_rq_mark+0x142/0x190 [ 22.589445] [] sg_read+0x8bd/0x1440 [ 22.589449] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 22.589453] [] ? fsnotify+0xf30/0xf30 [ 22.589459] [] ? avc_policy_seqno+0x9/0x20 [ 22.589465] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 22.589469] [] ? security_file_permission+0x89/0x1e0 [ 22.589472] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 22.589476] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 22.589480] [] compat_do_readv_writev+0x522/0x760 [ 22.589484] [] ? do_pwritev+0x1a0/0x1a0 [ 22.589490] [] ? _raw_spin_unlock+0x2c/0x50 [ 22.589495] [] ? handle_mm_fault+0x6ee/0x2530 [ 22.589498] [] ? __pmd_alloc+0x410/0x410 [ 22.589502] [] compat_readv+0xe3/0x150 [ 22.589506] [] do_compat_readv+0xf4/0x1d0 [ 22.589510] [] ? compat_readv+0x150/0x150 [ 22.589514] [] compat_SyS_readv+0x26/0x30 [ 22.589518] [] ? SyS_pwritev2+0x80/0x80 [ 22.589523] [] do_fast_syscall_32+0x2f7/0x890 [ 22.589526] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 22.589530] [] entry_SYSENTER_compat+0x74/0x83 [ 22.589586] 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 [ 22.589590] RIP [] __free_pages+0x21/0x80 [ 22.589591] RSP [ 22.589597] ---[ end trace 34d8c96cc6650d69 ]--- [ 22.589599] Kernel panic - not syncing: Fatal exception [ 22.591717] Dumping ftrace buffer: [ 22.591719] (ftrace buffer empty) [ 22.591720] Kernel Offset: disabled [ 22.956345] Rebooting in 86400 seconds..