[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 26.111726] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.584386] random: sshd: uninitialized urandom read (32 bytes read) [ 28.963526] random: sshd: uninitialized urandom read (32 bytes read) [ 29.592555] random: sshd: uninitialized urandom read (32 bytes read) [ 29.805768] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. [ 35.352013] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 35.473186] L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/l1tf.html for details. [ 35.499771] ================================================================== [ 35.509709] BUG: KASAN: use-after-free in __schedule+0xfc3/0x1ed0 [ 35.515946] Read of size 8 at addr ffff8801c0378058 by task syz-executor335/5354 [ 35.523469] [ 35.525106] CPU: 1 PID: 5354 Comm: syz-executor335 Not tainted 4.19.0-rc4+ #248 [ 35.532556] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.541921] Call Trace: [ 35.544524] dump_stack+0x1c4/0x2b4 [ 35.548157] ? dump_stack_print_info.cold.2+0x52/0x52 [ 35.553349] ? printk+0xa7/0xcf [ 35.556630] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 35.561393] print_address_description.cold.8+0x9/0x1ff [ 35.566760] kasan_report.cold.9+0x242/0x309 [ 35.571174] ? __schedule+0xfc3/0x1ed0 [ 35.575064] __asan_report_load8_noabort+0x14/0x20 [ 35.580019] __schedule+0xfc3/0x1ed0 [ 35.583788] ? __sched_text_start+0x8/0x8 [ 35.587959] ? __lock_is_held+0xb5/0x140 [ 35.592020] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 35.597129] ? find_held_lock+0x36/0x1c0 [ 35.601195] ? __call_srcu+0x7f9/0x1070 [ 35.605174] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 35.610278] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 35.615382] ? lockdep_hardirqs_on+0x421/0x5c0 [ 35.619964] ? preempt_schedule+0x4d/0x60 [ 35.624131] preempt_schedule_common+0x1f/0xd0 [ 35.628739] preempt_schedule+0x4d/0x60 [ 35.632728] ___preempt_schedule+0x16/0x18 [ 35.636969] _raw_spin_unlock_irqrestore+0xbb/0xd0 [ 35.641905] __call_srcu+0x7f9/0x1070 [ 35.645705] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 35.650812] ? srcu_offline_cpu+0x120/0x120 [ 35.655143] ? debug_object_free+0x690/0x690 [ 35.659559] ? mark_held_locks+0x130/0x130 [ 35.663794] ? kvm_arch_destroy_vm+0x414/0x7c0 [ 35.668384] ? lock_release+0x970/0x970 [ 35.672362] ? arch_local_save_flags+0x40/0x40 [ 35.676947] ? depot_save_stack+0x292/0x470 [ 35.681278] ? __lockdep_init_map+0x105/0x590 [ 35.685776] ? __init_waitqueue_head+0x9e/0x150 [ 35.690441] ? init_wait_entry+0x1c0/0x1c0 [ 35.694682] __synchronize_srcu+0x17b/0x230 [ 35.699008] ? call_srcu+0x10/0x10 [ 35.702550] ? rcu_unexpedite_gp+0x20/0x20 [ 35.706791] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 35.712330] ? check_preemption_disabled+0x48/0x200 [ 35.717351] synchronize_srcu+0x356/0x5ab [ 35.721502] ? lock_downgrade+0x900/0x900 [ 35.725654] ? synchronize_srcu_expedited+0x20/0x20 [ 35.730675] ? kasan_check_read+0x11/0x20 [ 35.734828] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 35.739437] ? kasan_check_write+0x14/0x20 [ 35.743673] ? do_raw_spin_lock+0xc1/0x200 [ 35.747914] kvm_page_track_unregister_notifier+0x17d/0x250 [ 35.753631] ? kvm_slot_page_track_remove_page+0x70/0x70 [ 35.759088] ? kvfree+0x61/0x70 [ 35.762379] ? rcu_read_lock_sched_held+0x108/0x120 [ 35.767398] kvm_mmu_uninit_vm+0x1c/0x20 [ 35.771460] kvm_arch_destroy_vm+0x5f2/0x7c0 [ 35.775876] ? kvm_arch_sync_events+0x30/0x30 [ 35.780384] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 35.785929] ? mmu_notifier_unregister+0x474/0x600 [ 35.790863] ? kfree+0x107/0x230 [ 35.794237] ? __mmu_notifier_register+0x30/0x30 [ 35.799086] ? __free_pages+0x10a/0x190 [ 35.803071] ? free_unref_page+0x960/0x960 [ 35.807644] kvm_put_kvm+0x6c8/0xff0 [ 35.811365] ? kvm_write_guest_cached+0x40/0x40 [ 35.816037] ? kvm_irqfd_release+0xd1/0x120 [ 35.820361] ? _raw_spin_unlock_irq+0x27/0x80 [ 35.824858] ? _raw_spin_unlock_irq+0x27/0x80 [ 35.829365] ? kasan_check_write+0x14/0x20 [ 35.833610] ? do_raw_spin_lock+0xc1/0x200 [ 35.837856] ? kvm_irqfd_release+0xdd/0x120 [ 35.842182] ? kvm_irqfd_release+0xdd/0x120 [ 35.846509] ? kvm_put_kvm+0xff0/0xff0 [ 35.850399] kvm_vm_release+0x42/0x50 [ 35.854197] __fput+0x385/0xa30 [ 35.857478] ? get_max_files+0x20/0x20 [ 35.861371] ? trace_hardirqs_on+0xbd/0x310 [ 35.865696] ? ___might_sleep+0x1ed/0x300 [ 35.869845] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 35.875299] ? arch_local_save_flags+0x40/0x40 [ 35.879882] ? kasan_check_write+0x14/0x20 [ 35.884124] ? do_raw_spin_lock+0xc1/0x200 [ 35.888365] ____fput+0x15/0x20 [ 35.891645] task_work_run+0x1e8/0x2a0 [ 35.895709] ? task_work_cancel+0x240/0x240 [ 35.900031] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 35.905572] ? switch_task_namespaces+0x9d/0xd0 [ 35.910246] do_exit+0x1ad7/0x2610 [ 35.914282] ? mm_update_next_owner+0x990/0x990 [ 35.918961] ? kvm_vcpu_ioctl+0x29c/0x1150 [ 35.923209] ? rcu_read_lock_sched_held+0x108/0x120 [ 35.928230] ? kfree+0x1fa/0x230 [ 35.931603] ? kvm_vcpu_ioctl+0x2a1/0x1150 [ 35.935845] ? kvm_vcpu_block+0x1030/0x1030 [ 35.940173] ? is_bpf_text_address+0xd3/0x170 [ 35.944683] ? kernel_text_address+0x79/0xf0 [ 35.949123] ? __kernel_text_address+0xd/0x40 [ 35.953625] ? unwind_get_return_address+0x61/0xa0 [ 35.958577] ? __save_stack_trace+0x8d/0xf0 [ 35.962932] ? save_stack+0xa9/0xd0 [ 35.966559] ? save_stack+0x43/0xd0 [ 35.970186] ? __kasan_slab_free+0x102/0x150 [ 35.974603] ? kasan_slab_free+0xe/0x10 [ 35.978581] ? putname+0xf2/0x130 [ 35.982037] ? __x64_sys_openat+0x9d/0x100 [ 35.986269] ? do_syscall_64+0x1b9/0x820 [ 35.990335] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.995706] ? trace_hardirqs_off+0xb8/0x310 [ 36.000125] ? kasan_check_read+0x11/0x20 [ 36.004276] ? do_raw_spin_unlock+0xa7/0x2f0 [ 36.008694] ? trace_hardirqs_on+0x310/0x310 [ 36.013116] ? __bpf_trace_initcall_finish+0x2a/0x30 [ 36.018227] ? trace_hardirqs_off+0xb8/0x310 [ 36.022634] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.028168] ? check_preemption_disabled+0x48/0x200 [ 36.033183] ? check_preemption_disabled+0x48/0x200 [ 36.038202] ? kvm_vcpu_block+0x1030/0x1030 [ 36.042528] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.048067] ? do_vfs_ioctl+0x201/0x1720 [ 36.052136] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 36.057414] ? ioctl_preallocate+0x300/0x300 [ 36.061825] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.067379] ? __fget_light+0x2e9/0x430 [ 36.071357] ? fget_raw+0x20/0x20 [ 36.074807] ? putname+0xf2/0x130 [ 36.078261] ? rcu_read_lock_sched_held+0x108/0x120 [ 36.083278] ? kmem_cache_free+0x24f/0x290 [ 36.087511] ? putname+0xf7/0x130 [ 36.090977] do_group_exit+0x177/0x440 [ 36.094872] ? trace_hardirqs_on+0xbd/0x310 [ 36.099192] ? __ia32_sys_exit+0x50/0x50 [ 36.103253] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 36.108703] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.114240] ? ksys_ioctl+0x81/0xd0 [ 36.117871] __x64_sys_exit_group+0x3e/0x50 [ 36.122196] do_syscall_64+0x1b9/0x820 [ 36.126086] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 36.131468] ? syscall_return_slowpath+0x5e0/0x5e0 [ 36.136402] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.141247] ? trace_hardirqs_on_caller+0x310/0x310 [ 36.146269] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 36.151287] ? prepare_exit_to_usermode+0x291/0x3b0 [ 36.156309] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.161162] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.166349] RIP: 0033:0x43ecc8 [ 36.169544] Code: Bad RIP value. [ 36.172905] RSP: 002b:00007ffdbe86ab08 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 36.180612] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ecc8 [ 36.187878] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 36.195143] RBP: 00000000004be588 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 36.202406] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 36.209672] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 36.216949] [ 36.218574] Allocated by task 5354: [ 36.222201] save_stack+0x43/0xd0 [ 36.225649] kasan_kmalloc+0xc7/0xe0 [ 36.229359] kasan_slab_alloc+0x12/0x20 [ 36.233335] kmem_cache_alloc+0x12e/0x730 [ 36.237479] vmx_create_vcpu+0xcf/0x25e0 [ 36.241538] kvm_arch_vcpu_create+0xe5/0x220 [ 36.245942] kvm_vm_ioctl+0x470/0x1d40 [ 36.249827] do_vfs_ioctl+0x1de/0x1720 [ 36.253715] ksys_ioctl+0xa9/0xd0 [ 36.257168] __x64_sys_ioctl+0x73/0xb0 [ 36.261056] do_syscall_64+0x1b9/0x820 [ 36.264939] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.270121] [ 36.271748] Freed by task 5354: [ 36.275025] save_stack+0x43/0xd0 [ 36.278473] __kasan_slab_free+0x102/0x150 [ 36.282707] kasan_slab_free+0xe/0x10 [ 36.286518] kmem_cache_free+0x83/0x290 [ 36.290491] vmx_free_vcpu+0x26b/0x300 [ 36.294388] kvm_arch_destroy_vm+0x365/0x7c0 [ 36.298797] kvm_put_kvm+0x6c8/0xff0 [ 36.302509] kvm_vm_release+0x42/0x50 [ 36.306306] __fput+0x385/0xa30 [ 36.309580] ____fput+0x15/0x20 [ 36.312855] task_work_run+0x1e8/0x2a0 [ 36.316740] do_exit+0x1ad7/0x2610 [ 36.320276] do_group_exit+0x177/0x440 [ 36.324164] __x64_sys_exit_group+0x3e/0x50 [ 36.328489] do_syscall_64+0x1b9/0x820 [ 36.332386] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.337570] [ 36.339196] The buggy address belongs to the object at ffff8801c0378040 [ 36.339196] which belongs to the cache kvm_vcpu of size 23872 [ 36.351774] The buggy address is located 24 bytes inside of [ 36.351774] 23872-byte region [ffff8801c0378040, ffff8801c037dd80) [ 36.363740] The buggy address belongs to the page: [ 36.368677] page:ffffea000700de00 count:1 mapcount:0 mapping:ffff8801d78920c0 index:0x0 compound_mapcount: 0 [ 36.378652] flags: 0x2fffc0000008100(slab|head) [ 36.383332] raw: 02fffc0000008100 ffff8801d5982d48 ffff8801d5982d48 ffff8801d78920c0 [ 36.391221] raw: 0000000000000000 ffff8801c0378040 0000000100000001 0000000000000000 [ 36.399095] page dumped because: kasan: bad access detected [ 36.404839] [ 36.406482] Memory state around the buggy address: [ 36.411413] ffff8801c0377f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 36.418768] ffff8801c0377f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 36.426130] >ffff8801c0378000: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 36.433483] ^ [ 36.439723] ffff8801c0378080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.447121] ffff8801c0378100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.454484] ================================================================== [ 36.461844] Kernel panic - not syncing: panic_on_warn set ... [ 36.461844] [ 36.469220] CPU: 1 PID: 5354 Comm: syz-executor335 Tainted: G B 4.19.0-rc4+ #248 [ 36.478053] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.487405] Call Trace: [ 36.490005] dump_stack+0x1c4/0x2b4 [ 36.493641] ? dump_stack_print_info.cold.2+0x52/0x52 [ 36.498836] ? lock_downgrade+0x900/0x900 [ 36.502995] panic+0x238/0x4e7 [ 36.506186] ? add_taint.cold.5+0x16/0x16 [ 36.510338] ? print_shadow_for_address+0xb6/0x116 [ 36.515270] ? trace_hardirqs_off+0xaf/0x310 [ 36.519786] kasan_end_report+0x47/0x4f [ 36.523766] kasan_report.cold.9+0x76/0x309 [ 36.528092] ? __schedule+0xfc3/0x1ed0 [ 36.531995] __asan_report_load8_noabort+0x14/0x20 [ 36.536925] __schedule+0xfc3/0x1ed0 [ 36.540649] ? __sched_text_start+0x8/0x8 [ 36.544803] ? __lock_is_held+0xb5/0x140 [ 36.548864] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 36.554005] ? find_held_lock+0x36/0x1c0 [ 36.558075] ? __call_srcu+0x7f9/0x1070 [ 36.562050] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 36.567152] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 36.572257] ? lockdep_hardirqs_on+0x421/0x5c0 [ 36.576841] ? preempt_schedule+0x4d/0x60 [ 36.580999] preempt_schedule_common+0x1f/0xd0 [ 36.585583] preempt_schedule+0x4d/0x60 [ 36.589557] ___preempt_schedule+0x16/0x18 [ 36.593796] _raw_spin_unlock_irqrestore+0xbb/0xd0 [ 36.598727] __call_srcu+0x7f9/0x1070 [ 36.602528] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 36.607636] ? srcu_offline_cpu+0x120/0x120 [ 36.611962] ? debug_object_free+0x690/0x690 [ 36.616379] ? mark_held_locks+0x130/0x130 [ 36.620618] ? kvm_arch_destroy_vm+0x414/0x7c0 [ 36.625212] ? lock_release+0x970/0x970 [ 36.629186] ? arch_local_save_flags+0x40/0x40 [ 36.633777] ? depot_save_stack+0x292/0x470 [ 36.638105] ? __lockdep_init_map+0x105/0x590 [ 36.642616] ? __init_waitqueue_head+0x9e/0x150 [ 36.647284] ? init_wait_entry+0x1c0/0x1c0 [ 36.651526] __synchronize_srcu+0x17b/0x230 [ 36.655937] ? call_srcu+0x10/0x10 [ 36.659474] ? rcu_unexpedite_gp+0x20/0x20 [ 36.664586] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 36.670136] ? check_preemption_disabled+0x48/0x200 [ 36.675172] synchronize_srcu+0x356/0x5ab [ 36.679325] ? lock_downgrade+0x900/0x900 [ 36.683476] ? synchronize_srcu_expedited+0x20/0x20 [ 36.688509] ? kasan_check_read+0x11/0x20 [ 36.692660] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 36.697260] ? kasan_check_write+0x14/0x20 [ 36.701494] ? do_raw_spin_lock+0xc1/0x200 [ 36.705736] kvm_page_track_unregister_notifier+0x17d/0x250 [ 36.711626] ? kvm_slot_page_track_remove_page+0x70/0x70 [ 36.717085] ? kvfree+0x61/0x70 [ 36.720378] ? rcu_read_lock_sched_held+0x108/0x120 [ 36.725400] kvm_mmu_uninit_vm+0x1c/0x20 [ 36.729464] kvm_arch_destroy_vm+0x5f2/0x7c0 [ 36.733881] ? kvm_arch_sync_events+0x30/0x30 [ 36.738387] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 36.743923] ? mmu_notifier_unregister+0x474/0x600 [ 36.748853] ? kfree+0x107/0x230 [ 36.752224] ? __mmu_notifier_register+0x30/0x30 [ 36.756981] ? __free_pages+0x10a/0x190 [ 36.760962] ? free_unref_page+0x960/0x960 [ 36.765211] kvm_put_kvm+0x6c8/0xff0 [ 36.768934] ? kvm_write_guest_cached+0x40/0x40 [ 36.773604] ? kvm_irqfd_release+0xd1/0x120 [ 36.777927] ? _raw_spin_unlock_irq+0x27/0x80 [ 36.782424] ? _raw_spin_unlock_irq+0x27/0x80 [ 36.786932] ? kasan_check_write+0x14/0x20 [ 36.791167] ? do_raw_spin_lock+0xc1/0x200 [ 36.795418] ? kvm_irqfd_release+0xdd/0x120 [ 36.799762] ? kvm_irqfd_release+0xdd/0x120 [ 36.804087] ? kvm_put_kvm+0xff0/0xff0 [ 36.807981] kvm_vm_release+0x42/0x50 [ 36.811789] __fput+0x385/0xa30 [ 36.815068] ? get_max_files+0x20/0x20 [ 36.818954] ? trace_hardirqs_on+0xbd/0x310 [ 36.823289] ? ___might_sleep+0x1ed/0x300 [ 36.827442] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 36.832896] ? arch_local_save_flags+0x40/0x40 [ 36.837479] ? kasan_check_write+0x14/0x20 [ 36.841716] ? do_raw_spin_lock+0xc1/0x200 [ 36.845948] ____fput+0x15/0x20 [ 36.849238] task_work_run+0x1e8/0x2a0 [ 36.853137] ? task_work_cancel+0x240/0x240 [ 36.857460] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 36.863012] ? switch_task_namespaces+0x9d/0xd0 [ 36.867685] do_exit+0x1ad7/0x2610 [ 36.871232] ? mm_update_next_owner+0x990/0x990 [ 36.875909] ? kvm_vcpu_ioctl+0x29c/0x1150 [ 36.880149] ? rcu_read_lock_sched_held+0x108/0x120 [ 36.885168] ? kfree+0x1fa/0x230 [ 36.888537] ? kvm_vcpu_ioctl+0x2a1/0x1150 [ 36.892771] ? kvm_vcpu_block+0x1030/0x1030 [ 36.897099] ? is_bpf_text_address+0xd3/0x170 [ 36.901608] ? kernel_text_address+0x79/0xf0 [ 36.906016] ? __kernel_text_address+0xd/0x40 [ 36.910513] ? unwind_get_return_address+0x61/0xa0 [ 36.915915] ? __save_stack_trace+0x8d/0xf0 [ 36.920246] ? save_stack+0xa9/0xd0 [ 36.923871] ? save_stack+0x43/0xd0 [ 36.927506] ? __kasan_slab_free+0x102/0x150 [ 36.931916] ? kasan_slab_free+0xe/0x10 [ 36.935889] ? putname+0xf2/0x130 [ 36.939346] ? __x64_sys_openat+0x9d/0x100 [ 36.943581] ? do_syscall_64+0x1b9/0x820 [ 36.947641] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.953013] ? trace_hardirqs_off+0xb8/0x310 [ 36.957427] ? kasan_check_read+0x11/0x20 [ 36.961582] ? do_raw_spin_unlock+0xa7/0x2f0 [ 36.966000] ? trace_hardirqs_on+0x310/0x310 [ 36.970411] ? __bpf_trace_initcall_finish+0x2a/0x30 [ 36.975517] ? trace_hardirqs_off+0xb8/0x310 [ 36.979926] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.985461] ? check_preemption_disabled+0x48/0x200 [ 36.990476] ? check_preemption_disabled+0x48/0x200 [ 36.995496] ? kvm_vcpu_block+0x1030/0x1030 [ 36.999833] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.005371] ? do_vfs_ioctl+0x201/0x1720 [ 37.010042] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 37.015319] ? ioctl_preallocate+0x300/0x300 [ 37.019733] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.025273] ? __fget_light+0x2e9/0x430 [ 37.029259] ? fget_raw+0x20/0x20 [ 37.032713] ? putname+0xf2/0x130 [ 37.036166] ? rcu_read_lock_sched_held+0x108/0x120 [ 37.041184] ? kmem_cache_free+0x24f/0x290 [ 37.045424] ? putname+0xf7/0x130 [ 37.048885] do_group_exit+0x177/0x440 [ 37.052776] ? trace_hardirqs_on+0xbd/0x310 [ 37.057102] ? __ia32_sys_exit+0x50/0x50 [ 37.061182] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 37.066631] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.072259] ? ksys_ioctl+0x81/0xd0 [ 37.075891] __x64_sys_exit_group+0x3e/0x50 [ 37.080216] do_syscall_64+0x1b9/0x820 [ 37.084134] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 37.089518] ? syscall_return_slowpath+0x5e0/0x5e0 [ 37.094461] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.099317] ? trace_hardirqs_on_caller+0x310/0x310 [ 37.104353] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 37.109383] ? prepare_exit_to_usermode+0x291/0x3b0 [ 37.114412] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.119275] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.124470] RIP: 0033:0x43ecc8 [ 37.127665] Code: Bad RIP value. [ 37.131216] RSP: 002b:00007ffdbe86ab08 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 37.138932] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ecc8 [ 37.146205] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 37.153472] RBP: 00000000004be588 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 37.160753] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 37.168026] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 37.175311] [ 37.175317] ====================================================== [ 37.175322] WARNING: possible circular locking dependency detected [ 37.175327] 4.19.0-rc4+ #248 Not tainted [ 37.175332] ------------------------------------------------------ [ 37.175337] syz-executor335/5354 is trying to acquire lock: [ 37.175341] 00000000ec828ecb ((console_sem).lock){-...}, at: down_trylock+0x13/0x70 [ 37.175356] [ 37.175360] but task is already holding lock: [ 37.175364] 00000000e17955ff (report_lock){....}, at: kasan_report+0x8b/0x110 [ 37.175379] [ 37.175383] which lock already depends on the new lock. [ 37.175386] [ 37.175389] [ 37.175394] the existing dependency chain (in reverse order) is: [ 37.175396] [ 37.175399] -> #3 (report_lock){....}: [ 37.175414] _raw_spin_lock_irqsave+0x99/0xd0 [ 37.175418] kasan_report+0x8b/0x110 [ 37.175423] __asan_report_load8_noabort+0x14/0x20 [ 37.175426] __schedule+0xfc3/0x1ed0 [ 37.175431] preempt_schedule_common+0x1f/0xd0 [ 37.175435] preempt_schedule+0x4d/0x60 [ 37.175439] ___preempt_schedule+0x16/0x18 [ 37.175444] _raw_spin_unlock_irqrestore+0xbb/0xd0 [ 37.175448] __call_srcu+0x7f9/0x1070 [ 37.175452] __synchronize_srcu+0x17b/0x230 [ 37.175456] synchronize_srcu+0x356/0x5ab [ 37.175462] kvm_page_track_unregister_notifier+0x17d/0x250 [ 37.175466] kvm_mmu_uninit_vm+0x1c/0x20 [ 37.175470] kvm_arch_destroy_vm+0x5f2/0x7c0 [ 37.175474] kvm_put_kvm+0x6c8/0xff0 [ 37.175478] kvm_vm_release+0x42/0x50 [ 37.175482] __fput+0x385/0xa30 [ 37.175485] ____fput+0x15/0x20 [ 37.175490] task_work_run+0x1e8/0x2a0 [ 37.175494] do_exit+0x1ad7/0x2610 [ 37.175498] do_group_exit+0x177/0x440 [ 37.175502] __x64_sys_exit_group+0x3e/0x50 [ 37.175507] do_syscall_64+0x1b9/0x820 [ 37.175511] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.175514] [ 37.175516] -> #2 (&rq->lock){-.-.}: [ 37.175531] _raw_spin_lock+0x2d/0x40 [ 37.175535] task_fork_fair+0xb0/0x6d0 [ 37.175539] sched_fork+0x443/0xba0 [ 37.175543] copy_process+0x2586/0x8780 [ 37.175547] _do_fork+0x1cb/0x11d0 [ 37.175551] kernel_thread+0x34/0x40 [ 37.175555] rest_init+0x22/0xe5 [ 37.175559] start_kernel+0x8f4/0x92f [ 37.175563] x86_64_start_reservations+0x29/0x2b [ 37.175568] x86_64_start_kernel+0x76/0x79 [ 37.175572] secondary_startup_64+0xa4/0xb0 [ 37.175574] [ 37.175577] -> #1 (&p->pi_lock){-.-.}: [ 37.175592] _raw_spin_lock_irqsave+0x99/0xd0 [ 37.175596] try_to_wake_up+0xd2/0x12f0 [ 37.175600] wake_up_process+0x10/0x20 [ 37.175604] __up.isra.1+0x1c0/0x2a0 [ 37.175608] up+0x13c/0x1c0 [ 37.175612] __up_console_sem+0xbe/0x1b0 [ 37.175616] console_unlock+0x814/0x1160 [ 37.175620] vprintk_emit+0x33d/0x930 [ 37.175624] vprintk_default+0x28/0x30 [ 37.175628] vprintk_func+0x7e/0x181 [ 37.175632] printk+0xa7/0xcf [ 37.175636] load_umh+0x51/0xbd [ 37.175640] do_one_initcall+0x145/0x957 [ 37.175644] kernel_init_freeable+0x4bb/0x5ae [ 37.175648] kernel_init+0x11/0x1b2 [ 37.175652] ret_from_fork+0x3a/0x50 [ 37.175654] [ 37.175657] -> #0 ((console_sem).lock){-...}: [ 37.175672] lock_acquire+0x1ed/0x520 [ 37.175677] _raw_spin_lock_irqsave+0x99/0xd0 [ 37.175680] down_trylock+0x13/0x70 [ 37.175685] __down_trylock_console_sem+0xae/0x200 [ 37.175689] console_trylock+0x15/0xa0 [ 37.175693] vprintk_emit+0x322/0x930 [ 37.175697] vprintk_default+0x28/0x30 [ 37.175701] vprintk_func+0x7e/0x181 [ 37.175705] printk+0xa7/0xcf [ 37.175709] kasan_report+0x9b/0x110 [ 37.175713] __asan_report_load8_noabort+0x14/0x20 [ 37.175717] __schedule+0xfc3/0x1ed0 [ 37.175722] preempt_schedule_common+0x1f/0xd0 [ 37.175726] preempt_schedule+0x4d/0x60 [ 37.175730] ___preempt_schedule+0x16/0x18 [ 37.175735] _raw_spin_unlock_irqrestore+0xbb/0xd0 [ 37.175739] __call_srcu+0x7f9/0x1070 [ 37.175743] __synchronize_srcu+0x17b/0x230 [ 37.175747] synchronize_srcu+0x356/0x5ab [ 37.175752] kvm_page_track_unregister_notifier+0x17d/0x250 [ 37.175757] kvm_mmu_uninit_vm+0x1c/0x20 [ 37.175761] kvm_arch_destroy_vm+0x5f2/0x7c0 [ 37.175765] kvm_put_kvm+0x6c8/0xff0 [ 37.175769] kvm_vm_release+0x42/0x50 [ 37.175772] __fput+0x385/0xa30 [ 37.175776] ____fput+0x15/0x20 [ 37.175780] task_work_run+0x1e8/0x2a0 [ 37.175784] do_exit+0x1ad7/0x2610 [ 37.175788] do_group_exit+0x177/0x440 [ 37.175793] __x64_sys_exit_group+0x3e/0x50 [ 37.175797] do_syscall_64+0x1b9/0x820 [ 37.175802] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.175804] [ 37.175809] other info that might help us debug this: [ 37.175811] [ 37.175814] Chain exists of: [ 37.175816] (console_sem).lock --> &rq->lock --> report_lock [ 37.175836] [ 37.175840] Possible unsafe locking scenario: [ 37.175842] [ 37.175847] CPU0 CPU1 [ 37.175851] ---- ---- [ 37.175853] lock(report_lock); [ 37.175863] lock(&rq->lock); [ 37.175873] lock(report_lock); [ 37.175881] lock((console_sem).lock); [ 37.175890] [ 37.175893] *** DEADLOCK *** [ 37.175896] [ 37.175900] 2 locks held by syz-executor335/5354: [ 37.175902] #0: 00000000013db4cc (&rq->lock){-.-.}, at: __schedule+0x236/0x1ed0 [ 37.175920] #1: 00000000e17955ff (report_lock){....}, at: kasan_report+0x8b/0x110 [ 37.175938] [ 37.175941] stack backtrace: [ 37.175948] CPU: 1 PID: 5354 Comm: syz-executor335 Not tainted 4.19.0-rc4+ #248 [ 37.175955] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.175958] Call Trace: [ 37.175962] dump_stack+0x1c4/0x2b4 [ 37.175967] ? dump_stack_print_info.cold.2+0x52/0x52 [ 37.175971] ? vprintk_func+0x85/0x181 [ 37.175976] print_circular_bug.isra.33.cold.54+0x1bd/0x27d [ 37.175980] ? save_trace+0xe0/0x290 [ 37.175990] __lock_acquire+0x33e4/0x4ec0 [ 37.175995] ? mark_held_locks+0x130/0x130 [ 37.175999] ? mark_held_locks+0x130/0x130 [ 37.176003] ? rcu_bh_qs+0xc0/0xc0 [ 37.176007] ? unwind_dump+0x190/0x190 [ 37.176011] ? is_bpf_text_address+0xd3/0x170 [ 37.176016] ? kernel_text_address+0x79/0xf0 [ 37.176020] ? __kernel_text_address+0xd/0x40 [ 37.176024] ? __save_stack_trace+0x8d/0xf0 [ 37.176029] ? add_lock_to_list.isra.26+0x1ec/0x4b0 [ 37.176033] ? save_trace+0x290/0x290 [ 37.176037] ? save_stack_trace+0x1a/0x20 [ 37.176041] ? save_trace+0xe0/0x290 [ 37.176045] ? kasan_check_read+0x11/0x20 [ 37.176049] ? graph_lock+0x170/0x170 [ 37.176054] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 37.176058] lock_acquire+0x1ed/0x520 [ 37.176062] ? down_trylock+0x13/0x70 [ 37.176066] ? find_held_lock+0x36/0x1c0 [ 37.176070] ? lock_release+0x970/0x970 [ 37.176075] ? trace_hardirqs_off+0xb8/0x310 [ 37.176079] ? vprintk_emit+0x1d3/0x930 [ 37.176083] ? trace_hardirqs_on+0x310/0x310 [ 37.176088] ? trace_hardirqs_off+0xb8/0x310 [ 37.176092] ? log_store+0x344/0x4c0 [ 37.176096] ? vprintk_emit+0x322/0x930 [ 37.176100] _raw_spin_lock_irqsave+0x99/0xd0 [ 37.176104] ? down_trylock+0x13/0x70 [ 37.176117] down_trylock+0x13/0x70 [ 37.176122] __down_trylock_console_sem+0xae/0x200 [ 37.176126] console_trylock+0x15/0xa0 [ 37.176130] vprintk_emit+0x322/0x930 [ 37.176135] ? wake_up_klogd+0x180/0x180 [ 37.176139] ? run_rebalance_domains+0x500/0x500 [ 37.176143] ? find_held_lock+0x36/0x1c0 [ 37.176148] ? __queue_work+0x6be/0x1440 [ 37.176152] ? lock_acquire+0x1ed/0x520 [ 37.176156] vprintk_default+0x28/0x30 [ 37.176160] vprintk_func+0x7e/0x181 [ 37.176164] printk+0xa7/0xcf [ 37.176168] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 37.176173] ? kasan_check_write+0x14/0x20 [ 37.176177] ? do_raw_spin_lock+0xc1/0x200 [ 37.176181] ? do_raw_spin_lock+0xc1/0x200 [ 37.176185] kasan_report+0x9b/0x110 [ 37.176189] ? __schedule+0xfc3/0x1ed0 [ 37.176194] __asan_report_load8_noabort+0x14/0x20 [ 37.176198] __schedule+0xfc3/0x1ed0 [ 37.176202] ? __sched_text_start+0x8/0x8 [ 37.176207] ? __lock_is_held+0xb5/0x140 [ 37.176211] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 37.176215] ? find_held_lock+0x36/0x1c0 [ 37.176220] ? __call_srcu+0x7f9/0x1070 [ 37.176224] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 37.176229] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 37.176234] ? lockdep_hardirqs_on+0x421/0x5c0 [ 37.176238] ? preempt_schedule+0x4d/0x60 [ 37.176242] preempt_schedule_common+0x1f/0xd0 [ 37.176247] preempt_schedule+0x4d/0x60 [ 37.176251] ___preempt_schedule+0x16/0x18 [ 37.176256] _raw_spin_unlock_irqrestore+0xbb/0xd0 [ 37.176260] __call_srcu+0x7f9/0x1070 [ 37.176265] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 37.176269] ? srcu_offline_cpu+0x120/0x120 [ 37.176273] ? debug_object_free+0x690/0x690 [ 37.176278] ? mark_held_locks+0x130/0x130 [ 37.176282] ? kvm_arch_destroy_vm+0x414/0x7c0 [ 37.176286] ? lock_release+0x970/0x970 [ 37.176291] ? arch_local_save_flags+0x40/0x40 [ 37.176295] ? depot_save_stack+0x292/0x470 [ 37.176300] ? __lockdep_init_map+0x105/0x590 [ 37.176304] ? __init_waitqueue_head+0x9e/0x150 [ 37.176309] ? init_wait_entry+0x1c0/0x1c0 [ 37.176313] __synchronize_srcu+0x17b/0x230 [ 37.176317] ? call_srcu+0x10/0x10 [ 37.176321] ? rcu_unexpedite_gp+0x20/0x20 [ 37.176326] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 37.176331] ? check_preemption_disabled+0x48/0x200 [ 37.176335] synchronize_srcu+0x356/0x5ab [ 37.176340] ? lock_downgrade+0x900/0x900 [ 37.176345] ? synchronize_srcu_expedited+0x20/0x20 [ 37.176349] ? kasan_check_read+0x11/0x20 [ 37.176353] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 37.176358] ? kasan_check_write+0x14/0x20 [ 37.176362] ? do_raw_spin_lock+0xc1/0x200 [ 37.176367] kvm_page_track_unregister_notifier+0x17d/0x250 [ 37.176372] ? kvm_slot_page_track_remove_page+0x70/0x70 [ 37.176376] ? kvfree+0x61/0x70 [ 37.176381] ? rcu_read_lock_sched_held+0x108/0x120 [ 37.176385] kvm_mmu_uninit_vm+0x1c/0x20 [ 37.176389] kvm_arch_destroy_vm+0x5f2/0x7c0 [ 37.176393] ? kvm_arch_sync_events+0x30/0x30 [ 37.176399] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 37.176403] ? mmu_notifier_unregister+0x474/0x600 [ 37.176407] ? kfree+0x107/0x230 [ 37.176412] ? __mmu_notifier_register+0x30/0x30 [ 37.176416] ? __free_pages+0x10a/0x190 [ 37.176420] ? free_unref_page+0x960/0x960 [ 37.176424] kvm_put_kvm+0x6c8/0xff0 [ 37.176429] ? kvm_write_guest_cached+0x40/0x40 [ 37.176433] ? kvm_irqfd_release+0xd1/0x120 [ 37.176437] ? _raw_spin_unlock_irq+0x27/0x80 [ 37.176442] ? _raw_spin_unlock_irq+0x27/0x80 [ 37.176446] ? kasan_check_write+0x14/0x20 [ 37.176450] ? do_raw_spin_lock+0xc1/0x200 [ 37.176455] ? kvm_irqfd_release+0xdd/0x120 [ 37.176458] ? kvm_irqfd_release+ [ 37.176467] Lost 81 message(s)! [ 38.306419] Shutting down cpus with NMI [ 39.365600] Kernel Offset: disabled [ 39.369222] Rebooting in 86400 seconds..