[....] Starting enhanced syslogd: rsyslogd[ 12.903045] audit: type=1400 audit(1522100294.128:4): avc: denied { syslog } for pid=3653 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 '10.128.0.62' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 40.613669] kasan: CONFIG_KASAN_INLINE enabled [ 40.618256] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 40.625616] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 40.631817] Dumping ftrace buffer: [ 40.635323] (ftrace buffer empty) [ 40.638999] Modules linked in: [ 40.642276] CPU: 0 PID: 3819 Comm: syzkaller922251 Not tainted 4.9.90-gdd1e37e #66 [ 40.649947] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.659271] task: ffff8801d8653000 task.stack: ffff8801c9478000 [ 40.665294] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 40.673525] RSP: 0018:ffff8801c947fa58 EFLAGS: 00010a07 [ 40.678941] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266905b [ 40.686179] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 40.693418] RBP: ffff8801c947fa68 R08: 0000000000000001 R09: 0000000000000000 [ 40.700663] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 40.707900] R13: 0000000000000020 R14: ffff8801d7870000 R15: dffffc0000000000 [ 40.715138] FS: 0000000001b0c880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 40.723330] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.729181] CR2: 000000002012f000 CR3: 00000001da268000 CR4: 0000000000160670 [ 40.736419] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.743657] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 40.750892] Stack: [ 40.753009] 0000000000000046 ffff8801d7870158 ffff8801c947fac8 ffffffff82669081 [ 40.760963] ffff8801d7870170 ffffed003af0e02b ffffed003af0e02e ffff8801d7870168 [ 40.768922] dead4ead00000000 ffff8801d7870140 0000000000000000 0000000000000000 [ 40.776878] Call Trace: [ 40.779439] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 40.785900] [] sg_finish_rem_req+0x2a6/0x320 [ 40.791926] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 40.798732] [] sg_new_read+0x3c/0x440 [ 40.804146] [] ? sg_get_rq_mark+0x142/0x190 [ 40.810080] [] sg_read+0x8c5/0x1470 [ 40.815325] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 40.821958] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 40.829032] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 40.835664] [] __vfs_read+0x103/0x670 [ 40.841078] [] ? default_llseek+0x290/0x290 [ 40.847017] [] ? fsnotify+0x86/0xf30 [ 40.852345] [] ? fsnotify+0xf30/0xf30 [ 40.857765] [] ? avc_policy_seqno+0x9/0x20 [ 40.863615] [] ? selinux_file_permission+0x82/0x460 [ 40.870247] [] ? security_file_permission+0x89/0x1e0 [ 40.876964] [] ? rw_verify_area+0xe5/0x2b0 [ 40.882813] [] vfs_read+0x11e/0x380 [ 40.888055] [] SyS_read+0xd9/0x1b0 [ 40.893225] [] ? vfs_copy_file_range+0x740/0x740 [ 40.899600] [] ? do_syscall_64+0x48/0x490 [ 40.905363] [] ? vfs_copy_file_range+0x740/0x740 [ 40.911744] [] do_syscall_64+0x1a4/0x490 [ 40.917423] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 40.924314] 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 [ 40.950785] RIP [] __free_pages+0x21/0x80 [ 40.956666] RSP [ 40.960484] ---[ end trace c4ec1bdbf508315a ]--- [ 40.965384] Kernel panic - not syncing: Fatal exception [ 40.971085] Dumping ftrace buffer: [ 40.974595] (ftrace buffer empty) [ 40.978273] Kernel Offset: disabled [ 40.981868] Rebooting in 86400 seconds..