[....] Starting enhanced syslogd: rsyslogd[ 11.172168] audit: type=1400 audit(1515286336.642:4): 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 '10.128.0.24' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 21.069390] sg_write: data in/out 36090/1 bytes for SCSI command 0xe2-- guessing data in; [ 21.069390] program syzkaller030049 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 [ 21.267567] kasan: CONFIG_KASAN_INLINE enabled [ 21.272184] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 21.279741] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 21.285963] Dumping ftrace buffer: [ 21.289475] (ftrace buffer empty) [ 21.293155] Modules linked in: [ 21.296430] CPU: 1 PID: 3411 Comm: syzkaller030049 Not tainted 4.9.75-g06fe41f #16 [ 21.304100] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.313424] task: ffff8801c8361800 task.stack: ffff8801ca228000 [ 21.319447] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 21.327693] RSP: 0018:ffff8801ca22f940 EFLAGS: 00010a07 [ 21.333110] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266631b [ 21.340347] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 21.347587] RBP: ffff8801ca22f950 R08: 0000000048000000 R09: 0000000000001e30 [ 21.354825] R10: 0000000000002100 R11: ffff8801c8361800 R12: 0000000000000004 [ 21.362066] R13: 0000000000000020 R14: ffff8801c838a100 R15: dffffc0000000000 [ 21.369305] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000008518900 [ 21.377504] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 21.383357] CR2: 00000000203aafa0 CR3: 00000001c9582000 CR4: 0000000000160670 [ 21.390599] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 21.397836] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 21.405072] Stack: [ 21.407189] 0000000000000001 ffff8801c838a258 ffff8801ca22f9b0 ffffffff82666341 [ 21.415156] ffff8801c838a270 ffffed003907144b ffffed003907144e ffff8801c838a268 [ 21.423109] dead4ead00000000 ffff8801c838a240 0000000000000000 0000000000000000 [ 21.431092] Call Trace: [ 21.433657] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 21.440126] [] sg_finish_rem_req+0x2b5/0x340 [ 21.446155] [] sg_new_read.isra.20+0x18d/0x3e0 [ 21.452353] [] sg_read+0x8bd/0x1440 [ 21.457597] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.464239] [] ? fsnotify+0xf30/0xf30 [ 21.469658] [] ? avc_policy_seqno+0x9/0x20 [ 21.475512] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 21.482492] [] ? security_file_permission+0x89/0x1e0 [ 21.489218] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.495874] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.502535] [] compat_do_readv_writev+0x522/0x760 [ 21.509027] [] ? do_pwritev+0x1a0/0x1a0 [ 21.514650] [] ? _raw_spin_unlock+0x2c/0x50 [ 21.520597] [] ? __pmd_alloc+0x410/0x410 [ 21.526277] [] compat_readv+0xe3/0x150 [ 21.531780] [] do_compat_readv+0xf4/0x1d0 [ 21.537543] [] ? compat_readv+0x150/0x150 [ 21.543311] [] compat_SyS_readv+0x26/0x30 [ 21.549078] [] ? SyS_pwritev2+0x80/0x80 [ 21.554683] [] do_fast_syscall_32+0x2f7/0x890 [ 21.560795] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 21.567428] [] entry_SYSENTER_compat+0x74/0x83 [ 21.573624] 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 [ 21.600034] RIP [] __free_pages+0x21/0x80 [ 21.605922] RSP [ 21.610181] ---[ end trace 652824b502a06cb0 ]--- [ 21.614977] Kernel panic - not syncing: Fatal exception [ 21.620787] Dumping ftrace buffer: [ 21.624304] (ftrace buffer empty) [ 21.627989] Kernel Offset: disabled [ 21.631583] Rebooting in 86400 seconds..