[....] Starting enhanced syslogd: rsyslogd[ 12.379814] audit: type=1400 audit(1514776548.670:4): avc: denied { syslog } for pid=3165 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 '10.128.15.224' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 31.058554] kasan: CONFIG_KASAN_INLINE enabled [ 31.063190] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 31.072562] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 31.078765] Dumping ftrace buffer: [ 31.082275] (ftrace buffer empty) [ 31.085954] Modules linked in: [ 31.089231] CPU: 0 PID: 3329 Comm: syzkaller902321 Not tainted 4.9.73-gf3f3457 #11 [ 31.096904] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.106242] task: ffff8801ca0b3000 task.stack: ffff8801c8eb8000 [ 31.112265] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 31.120495] RSP: 0018:ffff8801c8ebfa50 EFLAGS: 00010a07 [ 31.125911] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 31.133148] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 31.140385] RBP: ffff8801c8ebfa60 R08: 0000000000000001 R09: 0000000000000000 [ 31.147623] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 31.154859] R13: 0000000000000020 R14: ffff8801c973c200 R15: dffffc0000000000 [ 31.162098] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008bf9840 [ 31.170289] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.176137] CR2: 0000000020001000 CR3: 00000001cc5ff000 CR4: 00000000001406f0 [ 31.183377] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.190614] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.197850] Stack: [ 31.199966] ffff8801ca0b3000 ffff8801c973c358 ffff8801c8ebfac0 ffffffff82664fc1 [ 31.207914] ffff8801c973c370 ffffed00392e786b ffffed00392e786e ffff8801c973c368 [ 31.215865] dead4ead00000000 ffff8801c973c340 0000000000000000 0000000000000000 [ 31.223820] Call Trace: [ 31.226381] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 31.232838] [] sg_finish_rem_req+0x2b5/0x340 [ 31.238862] [] sg_new_read.isra.20+0x39/0x3e0 [ 31.244971] [] ? sg_get_rq_mark+0x142/0x190 [ 31.250906] [] sg_read+0x8bd/0x1440 [ 31.256150] [] ? save_stack_trace+0x16/0x20 [ 31.262091] [] ? save_stack+0x43/0xd0 [ 31.267506] [] ? kasan_slab_free+0x72/0xc0 [ 31.273355] [] ? kmem_cache_free+0xc7/0x300 [ 31.279291] [] ? putname+0xee/0x130 [ 31.284533] [] ? do_sys_open+0x252/0x4c0 [ 31.290209] [] ? do_fast_syscall_32+0x2f7/0x890 [ 31.296494] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 31.303127] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 31.309937] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 31.316830] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 31.323463] [] __vfs_read+0x103/0x670 [ 31.328880] [] ? default_llseek+0x290/0x290 [ 31.334817] [] ? fsnotify+0x86/0xf30 [ 31.340145] [] ? fsnotify+0xf30/0xf30 [ 31.345561] [] ? avc_policy_seqno+0x9/0x20 [ 31.351412] [] ? selinux_file_permission+0x82/0x460 [ 31.358044] [] ? security_file_permission+0x89/0x1e0 [ 31.364763] [] ? rw_verify_area+0xe5/0x2b0 [ 31.370612] [] vfs_read+0x11e/0x380 [ 31.375857] [] SyS_read+0xd9/0x1b0 [ 31.381013] [] ? vfs_copy_file_range+0x740/0x740 [ 31.387388] [] ? do_fast_syscall_32+0xcf/0x890 [ 31.393584] [] ? vfs_copy_file_range+0x740/0x740 [ 31.399955] [] do_fast_syscall_32+0x2f7/0x890 [ 31.406069] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.412703] [] entry_SYSENTER_compat+0x51/0x60 [ 31.418896] 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 [ 31.445225] RIP [] __free_pages+0x21/0x80 [ 31.451106] RSP [ 31.455132] ---[ end trace a0aa65f2997eb233 ]--- [ 31.459871] Kernel panic - not syncing: Fatal exception [ 31.465727] Dumping ftrace buffer: [ 31.469245] (ftrace buffer empty) [ 31.472922] Kernel Offset: disabled [ 31.476514] Rebooting in 86400 seconds..