[....] Starting enhanced syslogd: rsyslogd[ 10.437784] audit: type=1400 audit(1514418946.433:4): avc: denied { syslog } for pid=3176 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 '10.128.0.27' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 20.086032] kasan: CONFIG_KASAN_INLINE enabled [ 20.086781] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 20.087760] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 20.088591] Dumping ftrace buffer: [ 20.089063] (ftrace buffer empty) [ 20.089559] Modules linked in: [ 20.090027] CPU: 0 PID: 3325 Comm: syzkaller643624 Not tainted 4.9.72-gcb7518e #114 [ 20.091045] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.092280] task: ffff8801ca094800 task.stack: ffff8801ca7b0000 [ 20.093095] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 20.094230] RSP: 0018:ffff8801ca7b79b0 EFLAGS: 00010a07 [ 20.094967] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 20.096022] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 20.097001] RBP: ffff8801ca7b79c0 R08: 0000000000000001 R09: 0000000000000000 [ 20.097978] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 20.098944] R13: 0000000000000020 R14: ffff8801c91fa100 R15: dffffc0000000000 [ 20.099913] FS: 000000000085d880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 20.101016] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.101842] CR2: 0000000020ef0fe0 CR3: 00000001cd9d5000 CR4: 00000000001406f0 [ 20.102793] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 20.103760] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 20.104709] Stack: [ 20.105015] ffff8801ca094800 ffff8801c91fa258 ffff8801ca7b7a20 ffffffff82664fc1 [ 20.106194] ffff8801c91fa270 ffffed003923f44b ffffed003923f44e ffff8801c91fa268 [ 20.114143] dead4ead00000000 ffff8801c91fa240 0000000000000000 0000000000000000 [ 20.122086] Call Trace: [ 20.124641] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 20.131097] [] sg_finish_rem_req+0x2b5/0x340 [ 20.137118] [] sg_new_read.isra.20+0x39/0x3e0 [ 20.143225] [] ? sg_get_rq_mark+0x142/0x190 [ 20.149679] [] sg_read+0x8bd/0x1440 [ 20.154922] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.161554] [] ? fsnotify+0xf30/0xf30 [ 20.166976] [] ? avc_policy_seqno+0x9/0x20 [ 20.172825] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 20.179802] [] ? security_file_permission+0x89/0x1e0 [ 20.186518] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.193146] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.199788] [] do_readv_writev+0x520/0x750 [ 20.205647] [] ? vfs_write+0x530/0x530 [ 20.211155] [] ? _raw_spin_unlock+0x2c/0x50 [ 20.217091] [] ? __pmd_alloc+0x410/0x410 [ 20.222767] [] ? __do_page_fault+0x5ec/0xd40 [ 20.228790] [] vfs_readv+0x84/0xc0 [ 20.233945] [] do_readv+0xe6/0x250 [ 20.239096] [] ? vfs_readv+0xc0/0xc0 [ 20.244423] [] ? entry_SYSCALL_64_fastpath+0x5/0xc6 [ 20.251054] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 20.257857] [] SyS_readv+0x27/0x30 [ 20.263010] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 20.269556] 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 [ 20.295906] RIP [] __free_pages+0x21/0x80 [ 20.301791] RSP [ 20.305943] ---[ end trace be5e30605fa20056 ]--- [ 20.310685] Kernel panic - not syncing: Fatal exception [ 20.316492] Dumping ftrace buffer: [ 20.320010] (ftrace buffer empty) [ 20.323686] Kernel Offset: disabled [ 20.327276] Rebooting in 86400 seconds..