[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.802615] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.823104] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.381960] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.395104] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) [ 26.547881] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts. [ 32.293976] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) 2018/04/03 14:48:05 parsed 1 programs 2018/04/03 14:48:05 executed programs: 0 [ 32.687831] IPVS: Creating netns size=2552 id=1 RESULT: signal 0, coverage 0 errno 93 [ 32.808894] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 [ 33.360048] l2tp_core: tunl 4: sockfd_lookup(fd=8) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 33.510050] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 [ 34.060458] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 [ 34.329667] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 34.513211] random: nonblocking pool is initialized RESULT: signal 0, coverage 0 errno 93 [ 34.659903] l2tp_core: tunl 4: sockfd_lookup(fd=8) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 34.800309] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 [ 35.150067] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 [ 35.480261] l2tp_core: tunl 4: sockfd_lookup(fd=8) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 35.630321] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 35.749100] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 35.890291] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 36.000578] l2tp_core: tunl 4: sockfd_lookup(fd=8) returned -9 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 [ 36.529933] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 36.650606] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 36.750916] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 36.869894] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 37.010200] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 [ 37.349015] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 37.468968] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 37.601275] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 2018/04/03 14:48:10 executed programs: 33 [ 37.731274] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 37.909787] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 38.039643] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 38.160128] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 [ 38.519825] l2tp_core: tunl 4: sockfd_lookup(fd=8) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 38.670299] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 38.819967] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 [ 39.349999] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 [ 39.679851] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 39.799753] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 39.929836] l2tp_core: tunl 4: sockfd_lookup(fd=8) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 40.058934] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 40.169258] l2tp_core: tunl 4: sockfd_lookup(fd=8) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 40.319445] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 40.450075] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 40.579274] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 [ 41.299354] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 [ 41.659330] l2tp_core: tunl 4: sockfd_lookup(fd=8) returned -9 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 [ 42.009627] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 42.139102] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 42.280526] l2tp_core: tunl 4: sockfd_lookup(fd=8) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 42.409376] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 2018/04/03 14:48:16 executed programs: 65 [ 42.739709] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 42.859733] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 42.980117] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 [ 43.299786] l2tp_core: tunl 4: sockfd_lookup(fd=8) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 43.419842] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 43.539853] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 43.669613] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 43.810525] l2tp_core: tunl 4: sockfd_lookup(fd=8) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 43.909199] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 44.039344] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 44.180006] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 44.310321] l2tp_core: tunl 4: sockfd_lookup(fd=8) returned -9 RESULT: signal 0, coverage 0 errno 93 RESULT: signal 0, coverage 0 errno 93 [ 44.600112] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 RESULT: signal 0, coverage 0 errno 93 [ 44.729429] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 [ 44.899310] ================================================================== [ 44.906704] BUG: KASAN: use-after-free in __lock_acquire+0x387e/0x4b50 [ 44.913347] Read of size 8 at addr ffff8801d14333a0 by task syz-executor0/4439 [ 44.920671] [ 44.922271] CPU: 0 PID: 4439 Comm: syz-executor0 Not tainted 4.4.125-g38f41ec #21 [ 44.929855] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.939176] 0000000000000000 c193559adff24fb8 ffff8801d151f620 ffffffff81d067bd [ 44.947140] ffffea0007450c00 ffff8801d14333a0 0000000000000000 ffff8801d14333a0 [ 44.955102] 0000000000000000 ffff8801d151f658 ffffffff814fea83 ffff8801d14333a0 [ 44.963078] Call Trace: [ 44.965635] [] dump_stack+0xc1/0x124 [ 44.970967] [] print_address_description+0x73/0x260 [ 44.977598] [] kasan_report+0x285/0x370 [ 44.983193] [] ? __lock_acquire+0x387e/0x4b50 [ 44.989315] [] __asan_report_load8_noabort+0x14/0x20 [ 44.996035] [] __lock_acquire+0x387e/0x4b50 [ 45.001985] [] ? dump_trace+0x14f/0x350 [ 45.007579] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 45.014560] [] ? free_fs_struct+0x4f/0x60 [ 45.020325] [] ? save_stack+0xa3/0xd0 [ 45.025744] [] ? do_exit+0x803/0x2a10 [ 45.031162] [] ? do_group_exit+0x108/0x320 [ 45.037017] [] ? get_signal+0x4f2/0x1550 [ 45.042693] [] ? do_signal+0x8b/0x1d40 [ 45.048207] [] ? exit_to_usermode_loop+0x11a/0x160 [ 45.054756] [] ? sysenter_flags_fixed+0xd/0x17 [ 45.060956] [] lock_acquire+0x15e/0x460 [ 45.066550] [] ? lock_sock_nested+0x43/0x120 [ 45.072577] [] ? get_parent_ip+0xd/0x50 [ 45.078168] [] ? sock_release+0x1e0/0x1e0 [ 45.083933] [] _raw_spin_lock_bh+0x3a/0x50 [ 45.089785] [] ? lock_sock_nested+0x43/0x120 [ 45.095812] [] lock_sock_nested+0x43/0x120 [ 45.101682] [] pppol2tp_release+0x50/0x310 [ 45.107543] [] sock_release+0x8d/0x1e0 [ 45.113049] [] sock_close+0x16/0x20 [ 45.118294] [] __fput+0x233/0x6d0 [ 45.123364] [] ____fput+0x15/0x20 [ 45.128446] [] task_work_run+0x104/0x180 [ 45.134123] [] do_exit+0x82a/0x2a10 [ 45.139370] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 45.146351] [] ? dentry_free+0xd5/0x150 [ 45.151942] [] ? release_task+0x1250/0x1250 [ 45.157877] [] ? __lock_acquire+0xb5f/0x4b50 [ 45.163903] [] ? debug_check_no_obj_freed+0x166/0x9b0 [ 45.170717] [] ? recalc_sigpending+0x76/0xa0 [ 45.176743] [] do_group_exit+0x108/0x320 [ 45.182419] [] get_signal+0x4f2/0x1550 [ 45.187928] [] do_signal+0x8b/0x1d40 [ 45.193258] [] ? mntput_no_expire+0xca/0x680 [ 45.199285] [] ? setup_sigcontext+0x780/0x780 [ 45.205399] [] ? sock_release+0x1e0/0x1e0 [ 45.211163] [] ? mntput_no_expire+0xf6/0x680 [ 45.217187] [] ? mnt_get_count+0x190/0x190 [ 45.223038] [] ? dput.part.19+0x16d/0x760 [ 45.228800] [] ? dput.part.19+0x2a/0x760 [ 45.234492] [] ? compat_SyS_futex+0x1f9/0x2a0 [ 45.240602] [] ? compat_SyS_get_robust_list+0x300/0x300 [ 45.247580] [] ? exit_to_usermode_loop+0xe4/0x160 [ 45.254041] [] exit_to_usermode_loop+0x11a/0x160 [ 45.260412] [] do_fast_syscall_32+0x614/0x8a0 [ 45.266525] [] sysenter_flags_fixed+0xd/0x17 [ 45.272545] [ 45.274142] Allocated by task 4439: [ 45.277734] [] save_stack_trace+0x26/0x50 [ 45.283613] [] save_stack+0x43/0xd0 [ 45.288972] [] kasan_kmalloc+0xad/0xe0 [ 45.294589] [] __kmalloc+0x124/0x320 [ 45.300034] [] sk_prot_alloc+0x18c/0x310 [ 45.305827] [] sk_alloc+0x3a/0x3a0 [ 45.311109] [] pppol2tp_create+0x33/0x1f0 [ 45.317008] [] pppox_create+0xf1/0x200 [ 45.322639] [] __sock_create+0x3ac/0x640 [ 45.328434] [] SyS_socket+0xf0/0x1b0 [ 45.333882] [] do_fast_syscall_32+0x321/0x8a0 [ 45.340112] [] sysenter_flags_fixed+0xd/0x17 [ 45.346257] [ 45.347852] Freed by task 4439: [ 45.351096] [] save_stack_trace+0x26/0x50 [ 45.356975] [] save_stack+0x43/0xd0 [ 45.362335] [] kasan_slab_free+0x72/0xc0 [ 45.368125] [] kfree+0xfc/0x300 [ 45.373141] [] sk_destruct+0x3f7/0x4c0 [ 45.378760] [] __sk_free+0x57/0x230 [ 45.384116] [] sk_free+0x30/0x40 [ 45.389226] [] pppol2tp_session_sock_put+0x5f/0x70 [ 45.395924] [] l2tp_tunnel_closeall+0x254/0x3b0 [ 45.402325] [] l2tp_udp_encap_destroy+0x8b/0xf0 [ 45.408735] [] udpv6_destroy_sock+0xb1/0xd0 [ 45.414801] [] sk_common_release+0x6b/0x300 [ 45.420855] [] udp_lib_close+0x15/0x20 [ 45.426493] [] inet_release+0xfa/0x1d0 [ 45.432116] [] inet6_release+0x50/0x70 [ 45.437736] [] sock_release+0x8d/0x1e0 [ 45.443355] [] sock_close+0x16/0x20 [ 45.448718] [] __fput+0x233/0x6d0 [ 45.453914] [] ____fput+0x15/0x20 [ 45.459104] [] task_work_run+0x104/0x180 [ 45.464894] [] exit_to_usermode_loop+0x13d/0x160 [ 45.471395] [] do_fast_syscall_32+0x614/0x8a0 [ 45.477630] [] sysenter_flags_fixed+0xd/0x17 [ 45.483774] [ 45.485371] The buggy address belongs to the object at ffff8801d1433300 [ 45.485371] which belongs to the cache kmalloc-2048 of size 2048 [ 45.498169] The buggy address is located 160 bytes inside of [ 45.498169] 2048-byte region [ffff8801d1433300, ffff8801d1433b00) [ 45.510106] The buggy address belongs to the page: [ 45.537034] kasan: CONFIG_KASAN_INLINE enabled [ 45.541460] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 45.554268] Dumping ftrace buffer: [ 45.557773] (ftrace buffer empty) [ 45.561452] Modules linked in: [ 45.564731] CPU: 1 PID: 3778 Comm: syz-executor0 Not tainted 4.4.125-g38f41ec #21 [ 45.572318] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.581641] task: ffff8800ac9ee000 task.stack: ffff8800abc80000 [ 45.587663] RIP: 0010:[] [] debug_check_no_obj_freed+0x1a8/0x9b0 [ 45.597108] RSP: 0000:ffff8800abc873c0 EFLAGS: 00010007 [ 45.602522] RAX: 0000000000000092 RBX: ffff8801d4a10000 RCX: 0000000000000003 [ 45.609761] RDX: 09ebe8eaa84be9aa RSI: ffff8800abc87450 RDI: ffffffff838a91b8 [ 45.617012] RBP: ffff8800abc874b8 R08: 1ffffffff0715237 R09: ffffffff850d1060 [ 45.624250] R10: dead000000000200 R11: 1ffff10015790e3e R12: 0000292965676170 [ 45.631489] R13: ffff8801d4a08000 R14: 4f5f4755425f4d56 R15: dffffc0000000000 [ 45.638733] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000008c9e900 [ 45.646928] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 45.652778] CR2: 00000000ffab7ffc CR3: 00000000af350000 CR4: 0000000000160670 [ 45.660028] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 45.667266] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 45.674503] Stack: [ 45.676621] ffff8800ac9ee000 ffff8800abc87450 0000000000000003 0000000000000092 [ 45.684597] 1ffff10015790e86 ffffffff857a1340 ffff8801d4a10000 ffff8801d4a10000 [ 45.692560] dead000000000200 4f5f4755425f4d56 000000000003b900 fffffbfff0af4268 [ 45.700553] Call Trace: [ 45.703113] [] ? debug_object_active_state+0x420/0x420 [ 45.710009] [] ? debug_check_no_locks_freed+0x1a7/0x2c0 [ 45.717004] [] free_pages_prepare+0x4a9/0xb30 [ 45.723123] [] __free_pages_ok+0x1c/0xbd0 [ 45.728899] [] __free_pages+0x56/0x90 [ 45.734325] [] __free_kmem_pages+0x9/0x10 [ 45.740092] [] __free_slab+0xc3/0x1e0 [ 45.745512] [] discard_slab+0x2b/0x40 [ 45.750931] [] unfreeze_partials.isra.69+0x12c/0x170 [ 45.757653] [] ? check_preemption_disabled+0x3b/0x200 [ 45.764462] [] put_cpu_partial+0xe7/0x1a0 [ 45.770237] [] __slab_free+0x17c/0x2b0 [ 45.775742] [] ? quarantine_reduce+0xc5/0x1d0 [ 45.781853] [] ? qlist_free_all+0x2e/0xc0 [ 45.787620] [] ___cache_free+0xaa/0xc0 [ 45.793125] [] qlist_free_all+0x43/0xc0 [ 45.798717] [] quarantine_reduce+0x18f/0x1d0 [ 45.804744] [] ? quarantine_reduce+0x92/0x1d0 [ 45.811031] [] kasan_kmalloc+0xca/0xe0 [ 45.816534] [] kasan_slab_alloc+0x12/0x20 [ 45.822310] [] __kmalloc_track_caller+0xda/0x2c0 [ 45.828685] [] ? selinux_cred_prepare+0x43/0xa0 [ 45.834984] [] kmemdup+0x24/0x50 [ 45.839969] [] selinux_cred_prepare+0x43/0xa0 [ 45.846094] [] security_prepare_creds+0x7d/0xb0 [ 45.852400] [] prepare_creds+0x226/0x310 [ 45.858090] [] do_coredump+0x2e1/0x2980 [ 45.863688] [] ? try_to_wake_up+0x62/0xf60 [ 45.869544] [] ? debug_check_no_obj_freed+0x2d2/0x9b0 [ 45.876355] [] ? dump_align+0x80/0x80 [ 45.881779] [] ? check_preemption_disabled+0x3b/0x200 [ 45.888597] [] ? check_preemption_disabled+0x3b/0x200 [ 45.895409] [] ? __lock_is_held+0xa1/0xf0 [ 45.901176] [] ? __sigqueue_free.part.14+0x51/0x60 [ 45.907726] [] ? __sigqueue_free.part.14+0x51/0x60 [ 45.914291] [] ? rcu_read_lock_sched_held+0x103/0x120 [ 45.921110] [] ? kmem_cache_free+0x2a4/0x320 [ 45.927137] [] ? proc_coredump_connector+0x81/0x200 [ 45.933772] [] ? proc_comm_connector+0x220/0x220 [ 45.940148] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 45.946437] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 45.953428] [] get_signal+0x5c2/0x1550 [ 45.958938] [] ? set_current_blocked+0x40/0x40 [ 45.965154] [] do_signal+0x8b/0x1d40 [ 45.970502] [] ? setup_sigcontext+0x780/0x780 [ 45.976619] [] ? __bad_area_nosemaphore+0x220/0x420 [ 45.983353] [] ? bad_area+0x53/0x80 [ 45.988600] [] ? exit_to_usermode_loop+0xe4/0x160 [ 45.995066] [] exit_to_usermode_loop+0x11a/0x160 [ 46.001449] [] prepare_exit_to_usermode+0xe3/0x100 [ 46.008020] [] retint_user+0x8/0x3c [ 46.013287] Code: 48 c7 c6 40 5a 76 85 4c 8b 34 0e 4d 85 f6 0f 84 c5 03 00 00 49 ba 00 02 00 00 00 00 ad de 31 c9 48 8d 75 98 4c 89 f2 48 c1 ea 03 <42> 80 3c 3a 00 0f 85 f0 03 00 00 49 8d 7e 18 83 c1 01 49 8b 16 [ 46.040109] RIP [] debug_check_no_obj_freed+0x1a8/0x9b0 [ 46.047297] RSP [ 46.050895] ---[ end trace 7fe78f1ed8cdd9c5 ]--- [ 46.055621] Kernel panic - not syncing: Fatal exception [ 46.870521] PANIC: double fault, error_code: 0x0 [ 46.875297] CPU: 0 PID: 4439 Comm: syz-executor0 Tainted: G D 4.4.125-g38f41ec #21 [ 46.884101] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.893510] task: ffff8801d6919800 task.stack: ffff8801d1518000 [ 46.899532] RIP: 0010:[] [] dump_page_badflags+0x4/0x250 [ 46.908313] RSP: 0018:ffff880100000000 EFLAGS: 00010046 [ 46.913745] RAX: ffff8801d6919800 RBX: ffffea0007450c00 RCX: ffffffff814912f0 [ 46.920984] RDX: 0000000000000000 RSI: ffffffff838a91a0 RDI: ffffea0007450c00 [ 46.928232] RBP: ffff880100000000 R08: 0000000000000001 R09: 0000000000000000 [ 46.935503] R10: 0000000000000002 R11: fffffbfff0ad821e R12: 0000000000000000 [ 46.942742] R13: ffffffff838a91a0 R14: 0000000000000000 R15: 0000000000000000 [ 46.949981] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 46.958175] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 46.964025] CR2: ffff8800fffffff8 CR3: 000000000420c000 CR4: 0000000000160670 [ 46.971266] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.978505] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.985743] Stack: [ 46.987856] [ 46.989451] Call Trace: [ 46.992008] [ 46.994046] Code: e8 92 df 06 00 e9 83 fd ff ff e8 88 df 06 00 e9 50 fd ff ff e8 7e df 06 00 e9 1d fd ff ff 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 <41> 57 41 56 41 55 49 89 f5 41 54 49 89 d4 53 48 89 fb 48 83 ec [ 47.137524] Shutting down cpus with NMI [ 47.141973] Dumping ftrace buffer: [ 47.145486] (ftrace buffer empty) [ 47.149165] Kernel Offset: disabled [ 47.152762] Rebooting in 86400 seconds..