[....] Starting enhanced syslogd: rsyslogd[ 12.608954] audit: type=1400 audit(1514430490.485:4): avc: denied { syslog } for pid=3169 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.15.243' (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 syzkaller login: [ 20.563842] sg_write: data in/out 392925/196 bytes for SCSI command 0x0-- guessing data in; [ 20.563842] program syzkaller506731 not setting count and/or reply_len properly [ 20.574209] sg_write: data in/out 392925/196 bytes for SCSI command 0x0-- guessing data in; [ 20.574209] program syzkaller506731 not setting count and/or reply_len properly [ 20.594831] kasan: CONFIG_KASAN_INLINE enabled [ 20.594833] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 20.594843] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 20.594848] Dumping ftrace buffer: [ 20.594852] (ftrace buffer empty) [ 20.594857] Modules linked in: [ 20.594864] CPU: 1 PID: 3345 Comm: syzkaller506731 Not tainted 4.9.72-gcb7518e #10 [ 20.594868] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.594873] task: ffff8801c9460000 task.stack: ffff8801c9468000 [ 20.594891] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 20.594894] RSP: 0018:ffff8801c946faa0 EFLAGS: 00010a07 [ 20.594898] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 20.594902] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 20.594905] RBP: ffff8801c946fab0 R08: ffffed0039877ec4 R09: 0000000000000000 [ 20.594909] R10: fffbb76600000000 R11: ffffed0039877ec4 R12: 0000000000000004 [ 20.594912] R13: 0000000000000020 R14: ffff8801c94c8000 R15: dffffc0000000000 [ 20.594917] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f77b0b40 [ 20.594921] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 20.594924] CR2: 00000000080ca778 CR3: 00000001c9c58000 CR4: 00000000001406e0 [ 20.594931] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 20.594934] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 20.594935] Stack: [ 20.594945] 0000000000000000 ffff8801c94c8158 ffff8801c946fb10 ffffffff82664fc1 [ 20.594953] ffff8801c94c8170 ffffed003929902b ffffed003929902e ffff8801c94c8168 [ 20.594961] dead4ead00000000 ffff8801c94c8140 0000000000000000 0000000000000000 [ 20.594962] Call Trace: [ 20.594972] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 20.594979] [] sg_finish_rem_req+0x2b5/0x340 [ 20.594984] [] sg_read+0xa1c/0x1440 [ 20.594991] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.595002] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 20.595008] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.595017] [] __vfs_read+0x103/0x670 [ 20.595024] [] ? default_llseek+0x290/0x290 [ 20.595033] [] ? fsnotify+0x86/0xf30 [ 20.595039] [] ? fsnotify+0xf30/0xf30 [ 20.595048] [] ? avc_policy_seqno+0x9/0x20 [ 20.595055] [] ? selinux_file_permission+0x82/0x460 [ 20.595067] [] ? security_file_permission+0x89/0x1e0 [ 20.595074] [] ? rw_verify_area+0xe5/0x2b0 [ 20.595080] [] vfs_read+0x11e/0x380 [ 20.595086] [] SyS_read+0xd9/0x1b0 [ 20.595093] [] ? vfs_copy_file_range+0x740/0x740 [ 20.595100] [] ? do_fast_syscall_32+0xcf/0x890 [ 20.595107] [] ? vfs_copy_file_range+0x740/0x740 [ 20.595113] [] do_fast_syscall_32+0x2f7/0x890 [ 20.595119] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 20.595128] [] entry_SYSENTER_compat+0x51/0x60 [ 20.595223] 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 [ 20.595230] RIP [] __free_pages+0x21/0x80 [ 20.595232] RSP [ 20.595240] ---[ end trace 071076c6e2ce7a5c ]--- [ 20.595243] Kernel panic - not syncing: Fatal exception [ 20.609171] Dumping ftrace buffer: [ 20.609174] (ftrace buffer empty) [ 20.609176] Kernel Offset: disabled [ 20.955485] Rebooting in 86400 seconds..