[....] Starting enhanced syslogd: rsyslogd[ 10.600966] audit: type=1400 audit(1514463470.216:4): avc: denied { syslog } for pid=3189 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.35' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.449318] kasan: CONFIG_KASAN_INLINE enabled [ 19.450053] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.451071] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.451891] Dumping ftrace buffer: [ 19.452362] (ftrace buffer empty) [ 19.452875] Modules linked in: [ 19.453343] CPU: 0 PID: 3337 Comm: syzkaller462421 Not tainted 4.9.72-gcb7518e #10 [ 19.454360] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.455577] task: ffff8801cb026000 task.stack: ffff8801c74c0000 [ 19.456388] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.457534] RSP: 0018:ffff8801c74c7a50 EFLAGS: 00010a07 [ 19.458270] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 19.459250] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 19.460216] RBP: ffff8801c74c7a60 R08: 0000000000000001 R09: 0000000000000000 [ 19.461167] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 19.462115] R13: 0000000000000020 R14: ffff8801c9a7a100 R15: dffffc0000000000 [ 19.463085] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008383840 [ 19.464179] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 19.464961] CR2: 0000000020001000 CR3: 00000001cb982000 CR4: 00000000001406f0 [ 19.465911] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.466904] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.467868] Stack: [ 19.468164] ffff8801cb026000 ffff8801c9a7a258 ffff8801c74c7ac0 ffffffff82664fc1 [ 19.469295] ffff8801c9a7a270 ffffed003934f44b ffffed003934f44e ffff8801c9a7a268 [ 19.476577] dead4ead00000000 ffff8801c9a7a240 0000000000000000 0000000000000000 [ 19.484527] Call Trace: [ 19.487080] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.493533] [] sg_finish_rem_req+0x2b5/0x340 [ 19.499557] [] sg_new_read.isra.20+0x39/0x3e0 [ 19.505666] [] ? sg_get_rq_mark+0x142/0x190 [ 19.511601] [] sg_read+0x8bd/0x1440 [ 19.516841] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.523470] [] ? lru_cache_add+0xd9/0x1e0 [ 19.529230] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 19.536295] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.542926] [] __vfs_read+0x103/0x670 [ 19.548344] [] ? default_llseek+0x290/0x290 [ 19.554278] [] ? fsnotify+0x86/0xf30 [ 19.559604] [] ? fsnotify+0xf30/0xf30 [ 19.565025] [] ? avc_policy_seqno+0x9/0x20 [ 19.570875] [] ? selinux_file_permission+0x82/0x460 [ 19.577504] [] ? security_file_permission+0x89/0x1e0 [ 19.584227] [] ? rw_verify_area+0xe5/0x2b0 [ 19.590074] [] vfs_read+0x11e/0x380 [ 19.595318] [] SyS_read+0xd9/0x1b0 [ 19.600475] [] ? vfs_copy_file_range+0x740/0x740 [ 19.606852] [] ? do_fast_syscall_32+0xcf/0x890 [ 19.613064] [] ? vfs_copy_file_range+0x740/0x740 [ 19.619436] [] do_fast_syscall_32+0x2f7/0x890 [ 19.625557] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 19.632201] [] entry_SYSENTER_compat+0x51/0x60 [ 19.638399] 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 [ 19.664666] RIP [] __free_pages+0x21/0x80 [ 19.670545] RSP [ 19.674645] ---[ end trace a7609fa55a2a2c18 ]--- [ 19.679418] Kernel panic - not syncing: Fatal exception [ 19.685213] Dumping ftrace buffer: [ 19.688730] (ftrace buffer empty) [ 19.692413] Kernel Offset: disabled [ 19.696005] Rebooting in 86400 seconds..