[....] Starting enhanced syslogd: rsyslogd[ 12.637347] audit: type=1400 audit(1514469576.202:4): 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 '10.128.0.22' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 23.729963] kasan: CONFIG_KASAN_INLINE enabled [ 23.734610] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 23.741945] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 23.748142] Dumping ftrace buffer: [ 23.751644] (ftrace buffer empty) [ 23.755322] Modules linked in: [ 23.758593] CPU: 0 PID: 3327 Comm: syzkaller362351 Not tainted 4.9.72-gcb7518e #114 [ 23.766351] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.775673] task: ffff8801ca13e000 task.stack: ffff8801c8a50000 [ 23.781693] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 23.789916] RSP: 0018:ffff8801c8a57b00 EFLAGS: 00010a07 [ 23.795329] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 23.802563] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 23.809806] RBP: ffff8801c8a57b10 R08: 0000000000000000 R09: ffffed0039216985 [ 23.817041] R10: 0000000000000005 R11: ffffed0039216984 R12: 0000000000000004 [ 23.824280] R13: 0000000000000020 R14: ffff8801c20a8000 R15: dffffc0000000000 [ 23.831520] FS: 00007f6eecfa0700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 23.839716] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.845567] CR2: 0000000020603000 CR3: 00000001d0c50000 CR4: 00000000001406f0 [ 23.852815] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.860049] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.867284] Stack: [ 23.869397] 0000000000000001 ffff8801c20a8158 ffff8801c8a57b70 ffffffff82664fc1 [ 23.877338] ffff8801c20a8170 ffffed003841502b ffffed003841502e ffff8801c20a8168 [ 23.885287] dead4ead00000000 ffff8801c20a8140 0000000000000000 0000000000000000 [ 23.893224] Call Trace: [ 23.895778] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 23.902235] [] sg_finish_rem_req+0x2b5/0x340 [ 23.908258] [] sg_read+0xa1c/0x1440 [ 23.913499] [] ? avc_ss_reset+0x110/0x110 [ 23.919264] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 23.925903] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 23.932881] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 23.939511] [] __vfs_read+0x103/0x670 [ 23.944924] [] ? default_llseek+0x290/0x290 [ 23.950879] [] ? fsnotify+0x86/0xf30 [ 23.956214] [] ? fsnotify+0xf30/0xf30 [ 23.961648] [] ? avc_policy_seqno+0x9/0x20 [ 23.967503] [] ? selinux_file_permission+0x82/0x460 [ 23.974133] [] ? security_file_permission+0x89/0x1e0 [ 23.980853] [] ? rw_verify_area+0xe5/0x2b0 [ 23.986704] [] vfs_read+0x11e/0x380 [ 23.991944] [] SyS_read+0xd9/0x1b0 [ 23.997103] [] ? vfs_copy_file_range+0x740/0x740 [ 24.003477] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 24.010283] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.016830] [] entry_SYSCALL_64_fastpath+0x23/0xc6 executing program [ 24.023372] 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 [ 24.049693] RIP [] __free_pages+0x21/0x80 [ 24.055583] RSP [ 24.061230] ---[ end trace f73fe6a7ec3fc13a ]--- [ 24.066235] Kernel panic - not syncing: Fatal exception [ 24.071613] Dumping ftrace buffer: [ 24.075121] (ftrace buffer empty) [ 24.078798] Kernel Offset: disabled [ 24.082393] Rebooting in 86400 seconds..