[....] Starting enhanced syslogd: rsyslogd[ 12.443343] audit: type=1400 audit(1521696889.177:4): avc: denied { syslog } for pid=3560 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 '10.128.0.46' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 20.277253] kasan: CONFIG_KASAN_INLINE enabled [ 20.281874] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 20.289240] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 20.295465] Dumping ftrace buffer: [ 20.299149] (ftrace buffer empty) [ 20.302831] Modules linked in: [ 20.306109] CPU: 0 PID: 3708 Comm: syzkaller689776 Not tainted 4.9.88-g71df7bb #60 [ 20.313790] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.323112] task: ffff8801bfb71800 task.stack: ffff8801bb6c0000 [ 20.329144] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 20.337385] RSP: 0018:ffff8801bb6c7a60 EFLAGS: 00010a07 [ 20.342804] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82669b0b [ 20.350043] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 20.357288] RBP: ffff8801bb6c7a70 R08: 0000000000000001 R09: 0000000000000001 [ 20.364527] R10: 0000000000000000 R11: ffff8801bfb71800 R12: 0000000000000004 [ 20.371772] R13: 0000000000000020 R14: ffff8801d84b0000 R15: dffffc0000000000 [ 20.379018] FS: 00000000011ec880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 20.387212] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.393062] CR2: 000000000043e530 CR3: 00000001c3de8000 CR4: 0000000000160670 [ 20.400303] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 20.407551] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 20.414791] Stack: [ 20.416909] 0000000000000001 ffff8801d84b0158 ffff8801bb6c7ad0 ffffffff82669b31 [ 20.424876] ffff8801d84b0170 ffffed003b09602b ffffed003b09602e ffff8801d84b0168 [ 20.432837] dead4ead00000000 ffff8801d84b0140 0000000000000000 0000000000000000 [ 20.440802] Call Trace: [ 20.443361] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 20.449823] [] sg_finish_rem_req+0x2b5/0x340 [ 20.455850] [] sg_new_read.isra.20+0x356/0x3e0 [ 20.462047] [] ? sg_get_rq_mark+0x146/0x190 [ 20.467986] [] sg_read+0x8b7/0x1440 [ 20.473231] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 20.479868] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 20.486681] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 20.493585] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 20.500245] [] __vfs_read+0x103/0x670 [ 20.505667] [] ? default_llseek+0x290/0x290 [ 20.511609] [] ? fsnotify+0x86/0xf30 [ 20.516939] [] ? fsnotify+0xf30/0xf30 [ 20.522358] [] ? avc_policy_seqno+0x9/0x20 [ 20.528214] [] ? selinux_file_permission+0x82/0x460 [ 20.534856] [] ? security_file_permission+0x89/0x1e0 [ 20.541605] [] ? rw_verify_area+0xe5/0x2b0 [ 20.547468] [] vfs_read+0x11e/0x380 [ 20.552719] [] SyS_read+0xd9/0x1b0 [ 20.557879] [] ? vfs_copy_file_range+0x740/0x740 [ 20.564262] [] ? do_syscall_64+0x48/0x490 [ 20.570037] [] ? vfs_copy_file_range+0x740/0x740 [ 20.576425] [] do_syscall_64+0x1a4/0x490 [ 20.582109] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 20.589013] 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 [ 20.615643] RIP [] __free_pages+0x21/0x80 [ 20.621540] RSP [ 20.627150] ---[ end trace 3c14025493491514 ]--- [ 20.632212] Kernel panic - not syncing: Fatal exception [ 20.638032] Dumping ftrace buffer: [ 20.641554] (ftrace buffer empty) [ 20.645238] Kernel Offset: disabled [ 20.648842] Rebooting in 86400 seconds..