[....] Starting enhanced syslogd: rsyslogd[ 10.953314] audit: type=1400 audit(1514675953.598:4): avc: denied { syslog } for pid=3174 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 '10.128.15.215' (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 syzkaller login: [ 18.542296] sg_write: data in/out 327644/88 bytes for SCSI command 0x0-- guessing data in; [ 18.542296] program syzkaller754461 not setting count and/or reply_len properly [ 18.543971] sg_write: data in/out 327644/88 bytes for SCSI command 0x0-- guessing data in; [ 18.543971] program syzkaller754461 not setting count and/or reply_len properly 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 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 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 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 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 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 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 [ 19.565656] kasan: CONFIG_KASAN_INLINE enabled [ 19.570297] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.583033] kasan: CONFIG_KASAN_INLINE enabled [ 19.583035] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.583045] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.583050] Dumping ftrace buffer: [ 19.583053] (ftrace buffer empty) [ 19.583057] Modules linked in: [ 19.583063] CPU: 0 PID: 3340 Comm: syzkaller754461 Not tainted 4.9.73-gf3f3457 #11 [ 19.583066] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.583069] task: ffff8801cb104800 task.stack: ffff8801bcb00000 [ 19.583085] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.583089] RSP: 0018:ffff8801bcb07940 EFLAGS: 00010a07 [ 19.583093] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 19.583096] RDX: 1bd5a9d5a0000003 RSI: 000000000000000a RDI: dead4ead0000001c [ 19.583100] RBP: ffff8801bcb07950 R08: 0000000000000001 R09: 0000000000000000 [ 19.583103] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 19.583106] R13: 0000000000000020 R14: ffff8801bd1f8000 R15: dffffc0000000000 [ 19.583112] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f77c1b40 [ 19.583115] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 19.583119] CR2: 0000000020e7a000 CR3: 00000001cb0a3000 CR4: 00000000001406f0 [ 19.583125] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.583128] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.583129] Stack: [ 19.583139] ffff8801cb104800 ffff8801bd1f8158 ffff8801bcb079b0 ffffffff82664fc1 [ 19.583147] ffff8801bd1f8170 ffffed0037a3f02b ffffed0037a3f02e ffff8801bd1f8168 [ 19.583155] dead4ead00000000 ffff8801bd1f8140 0000000000000000 0000000000000000 [ 19.583156] Call Trace: [ 19.583166] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.583172] [] sg_finish_rem_req+0x2b5/0x340 [ 19.583178] [] sg_new_read.isra.20+0x39/0x3e0 [ 19.583184] [] ? sg_get_rq_mark+0x142/0x190 [ 19.583190] [] sg_read+0x8bd/0x1440 [ 19.583197] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.583205] [] ? fsnotify+0xf30/0xf30 [ 19.583214] [] ? avc_policy_seqno+0x9/0x20 [ 19.583222] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 19.583228] [] ? security_file_permission+0x89/0x1e0 [ 19.583234] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.583240] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.583247] [] compat_do_readv_writev+0x522/0x760 [ 19.583253] [] ? do_pwritev+0x1a0/0x1a0 [ 19.583261] [] ? __lru_cache_add+0x187/0x250 [ 19.583269] [] ? __fget+0x228/0x3a0 [ 19.583274] [] ? __fget+0x47/0x3a0 [ 19.583281] [] compat_readv+0xe3/0x150 [ 19.583287] [] do_compat_readv+0xf4/0x1d0 [ 19.583294] [] ? compat_readv+0x150/0x150 [ 19.583302] [] compat_SyS_readv+0x26/0x30 [ 19.583309] [] ? SyS_pwritev2+0x80/0x80 [ 19.583316] [] do_fast_syscall_32+0x2f7/0x890 [ 19.583322] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 19.583330] [] entry_SYSENTER_compat+0x51/0x60 [ 19.583403] 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 [ 19.583410] RIP [] __free_pages+0x21/0x80 [ 19.583412] RSP [ 19.583419] ---[ end trace b89a7f73e3385312 ]--- [ 19.583422] Kernel panic - not syncing: Fatal exception [ 19.583841] Dumping ftrace buffer: [ 19.583843] (ftrace buffer empty) [ 19.583845] Kernel Offset: disabled [ 19.947098] Rebooting in 86400 seconds..