[....] Starting enhanced syslogd: rsyslogd[ 9.628404] audit: type=1400 audit(1516112213.910:4): 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[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.215' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 17.967091] sg_write: data in/out 9964/6 bytes for SCSI command 0x0-- guessing data in; [ 17.967091] program syzkaller303503 not setting count and/or reply_len properly [ 17.969385] kasan: CONFIG_KASAN_INLINE enabled [ 17.970001] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 17.971086] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 17.971949] Dumping ftrace buffer: [ 17.972430] (ftrace buffer empty) [ 17.972963] Modules linked in: [ 17.973438] CPU: 1 PID: 3327 Comm: syzkaller303503 Not tainted 4.9.76-g8dec074 #23 [ 17.974547] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 17.975855] task: ffff8801caab6000 task.stack: ffff8801c8798000 [ 17.976685] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 17.977789] RSP: 0018:ffff8801c879f940 EFLAGS: 00010a07 [ 17.978521] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266642b [ 17.979490] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 17.980456] RBP: ffff8801c879f950 R08: 0000000000000001 R09: 0000000000000000 [ 17.981472] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 17.982464] R13: 0000000000000020 R14: ffff8801c8568000 R15: dffffc0000000000 [ 17.983426] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009e44840 [ 17.984511] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 17.985282] CR2: 0000000020ef0fe0 CR3: 00000001c90b2000 CR4: 0000000000160670 [ 17.986233] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 17.987181] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 17.988152] Stack: [ 17.990267] ffff8801caab6000 ffff8801c8568158 ffff8801c879f9b0 ffffffff82666451 [ 17.998215] ffff8801c8568170 ffffed00390ad02b ffffed00390ad02e ffff8801c8568168 [ 18.006165] dead4ead00000000 ffff8801c8568140 0000000000000000 0000000000000000 [ 18.014112] Call Trace: [ 18.016666] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 18.023125] [] sg_finish_rem_req+0x2b5/0x340 [ 18.029149] [] sg_new_read.isra.20+0x39/0x3e0 [ 18.035265] [] ? sg_get_rq_mark+0x142/0x190 [ 18.041207] [] sg_read+0x8bd/0x1440 [ 18.046464] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 18.053101] [] ? fsnotify+0xf30/0xf30 [ 18.058517] [] ? avc_policy_seqno+0x9/0x20 [ 18.064372] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 18.071355] [] ? security_file_permission+0x89/0x1e0 [ 18.078083] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 18.084719] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 18.091352] [] compat_do_readv_writev+0x522/0x760 [ 18.097807] [] ? do_pwritev+0x1a0/0x1a0 [ 18.103403] [] ? __lru_cache_add+0x187/0x250 [ 18.109451] [] ? _raw_spin_unlock+0x2c/0x50 [ 18.115387] [] ? handle_mm_fault+0x6ee/0x2530 [ 18.121500] [] ? __pmd_alloc+0x410/0x410 [ 18.127176] [] compat_readv+0xe3/0x150 [ 18.132681] [] do_compat_readv+0xf4/0x1d0 [ 18.138442] [] ? compat_readv+0x150/0x150 [ 18.144204] [] compat_SyS_readv+0x26/0x30 [ 18.149964] [] ? SyS_pwritev2+0x80/0x80 [ 18.155552] [] do_fast_syscall_32+0x2f7/0x890 [ 18.161665] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 18.168647] [] entry_SYSENTER_compat+0x74/0x83 [ 18.174882] 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 [ 18.201210] RIP [] __free_pages+0x21/0x80 [ 18.207096] RSP [ 18.210982] ---[ end trace 8dce4325958af6ff ]--- [ 18.215718] Kernel panic - not syncing: Fatal exception [ 18.221508] Dumping ftrace buffer: [ 18.225016] (ftrace buffer empty) [ 18.228691] Kernel Offset: disabled [ 18.232286] Rebooting in 86400 seconds..