[....] Starting enhanced syslogd: rsyslogd[ 12.610586] audit: type=1400 audit(1514440359.927:4): avc: denied { syslog } for pid=3175 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 '10.128.15.226' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 21.153934] kasan: CONFIG_KASAN_INLINE enabled [ 21.158549] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 21.166142] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 21.172363] Dumping ftrace buffer: [ 21.175871] (ftrace buffer empty) [ 21.179548] Modules linked in: [ 21.182823] CPU: 1 PID: 3331 Comm: syzkaller113646 Not tainted 4.9.72-gcb7518e #10 [ 21.190491] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.199811] task: ffff8801cab29800 task.stack: ffff8801c8d30000 [ 21.205832] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 21.214057] RSP: 0018:ffff8801c8d37990 EFLAGS: 00010a07 [ 21.219470] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 21.226706] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 21.233944] RBP: ffff8801c8d379a0 R08: ffffed00399490d0 R09: ffff8801cca48660 [ 21.241179] R10: 0000000000000005 R11: ffffed00399490d0 R12: 0000000000000004 [ 21.248418] R13: 0000000000000020 R14: ffff8801c8d28000 R15: dffffc0000000000 [ 21.255657] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f771ab40 [ 21.263848] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 21.269695] CR2: 0000000000001000 CR3: 00000001cc2c1000 CR4: 00000000001406e0 [ 21.276932] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 21.284169] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 21.291401] Stack: [ 21.293515] 0000000000000000 ffff8801c8d28158 ffff8801c8d37a00 ffffffff82664fc1 [ 21.301471] ffff8801c8d28170 ffffed00391a502b ffffed00391a502e ffff8801c8d28168 [ 21.309424] dead4ead00000000 ffff8801c8d28140 0000000000000000 0000000000000000 [ 21.317390] Call Trace: [ 21.319946] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 21.326404] [] sg_finish_rem_req+0x2b5/0x340 [ 21.332429] [] sg_read+0xa1c/0x1440 [ 21.337672] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.344304] [] ? fsnotify+0xf30/0xf30 [ 21.349720] [] ? avc_policy_seqno+0x9/0x20 [ 21.355572] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 21.362552] [] ? security_file_permission+0x89/0x1e0 [ 21.369268] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.375898] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 21.382535] [] compat_do_readv_writev+0x522/0x760 [ 21.388998] [] ? do_pwritev+0x1a0/0x1a0 [ 21.394591] [] ? exit_robust_list+0x230/0x230 [ 21.400702] [] ? check_preemption_disabled+0x3b/0x200 [ 21.407507] [] ? __fget+0x201/0x3a0 [ 21.412747] [] ? __fget+0x228/0x3a0 [ 21.417987] [] ? __fget+0x47/0x3a0 [ 21.423143] [] compat_readv+0xe3/0x150 [ 21.428645] [] do_compat_readv+0xf4/0x1d0 [ 21.434407] [] ? compat_readv+0x150/0x150 [ 21.440172] [] ? compat_SyS_sched_setaffinity+0xb7/0x110 [ 21.447235] [] ? compat_get_bitmap+0x1e0/0x1e0 [ 21.453430] [] compat_SyS_readv+0x26/0x30 [ 21.459191] [] ? SyS_pwritev2+0x80/0x80 [ 21.464781] [] do_fast_syscall_32+0x2f7/0x890 [ 21.470890] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 21.477521] [] entry_SYSENTER_compat+0x51/0x60 [ 21.483715] 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 [ 21.510028] RIP [] __free_pages+0x21/0x80 [ 21.515904] RSP [ 21.521714] ---[ end trace 8423e0b6f2f38966 ]--- [ 21.526474] Kernel panic - not syncing: Fatal exception [ 21.532204] Dumping ftrace buffer: [ 21.535711] (ftrace buffer empty) [ 21.539385] Kernel Offset: disabled [ 21.542976] Rebooting in 86400 seconds..