[....] Starting OpenBSD Secure Shell server: sshd[ 24.637241] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.470235] random: sshd: uninitialized urandom read (32 bytes read) [ 28.796512] sshd (4733) used greatest stack depth: 16664 bytes left [ 28.816945] random: sshd: uninitialized urandom read (32 bytes read) [ 29.409040] random: sshd: uninitialized urandom read (32 bytes read) [ 29.590524] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. [ 35.458849] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 35.558739] 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. [ 35.584455] ================================================================== [ 35.594298] BUG: KASAN: use-after-free in __schedule+0xf54/0x1df0 [ 35.607529] Read of size 8 at addr ffff8801d9280058 by task syz-executor333/4749 [ 35.615046] [ 35.616674] CPU: 1 PID: 4749 Comm: syz-executor333 Not tainted 4.19.0-rc1+ #217 [ 35.627571] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.636969] Call Trace: [ 35.639562] dump_stack+0x1c9/0x2b4 [ 35.643200] ? dump_stack_print_info.cold.2+0x52/0x52 [ 35.648384] ? printk+0xa7/0xcf [ 35.651663] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 35.656949] ? __schedule+0xf54/0x1df0 [ 35.660835] print_address_description+0x6c/0x20b [ 35.665680] ? __schedule+0xf54/0x1df0 [ 35.669562] kasan_report.cold.7+0x242/0x30d [ 35.673970] __asan_report_load8_noabort+0x14/0x20 [ 35.678904] __schedule+0xf54/0x1df0 [ 35.682615] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 35.687724] ? __sched_text_start+0x8/0x8 [ 35.691903] ? __call_srcu+0x7e7/0x1040 [ 35.698904] ? check_same_owner+0x340/0x340 [ 35.710503] ? mark_held_locks+0x160/0x160 [ 35.714748] ? find_held_lock+0x36/0x1c0 [ 35.718811] preempt_schedule_common+0x22/0x60 [ 35.723401] _cond_resched+0x1d/0x30 [ 35.727112] wait_for_completion+0xa5/0x8d0 [ 35.731435] ? wait_for_completion_interruptible+0x950/0x950 [ 35.737233] ? __lockdep_init_map+0x105/0x590 [ 35.741725] ? __init_waitqueue_head+0x9e/0x150 [ 35.746385] ? init_wait_entry+0x1c0/0x1c0 [ 35.750630] __synchronize_srcu+0x189/0x240 [ 35.754946] ? call_srcu+0x10/0x10 [ 35.758493] ? rcu_unexpedite_gp+0x20/0x20 [ 35.762732] synchronize_srcu+0x335/0x56f [ 35.767369] ? lock_downgrade+0x8f0/0x8f0 [ 35.771514] ? synchronize_srcu_expedited+0x20/0x20 [ 35.776527] ? kasan_check_read+0x11/0x20 [ 35.780672] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 35.785250] ? kasan_check_write+0x14/0x20 [ 35.789480] ? do_raw_spin_lock+0xc1/0x200 [ 35.793715] kvm_page_track_unregister_notifier+0x17d/0x250 [ 35.799431] ? kvm_slot_page_track_remove_page+0x70/0x70 [ 35.805332] ? kvfree+0x61/0x70 [ 35.808610] ? rcu_read_lock_sched_held+0x108/0x120 [ 35.814113] kvm_mmu_uninit_vm+0x1c/0x20 [ 35.818175] kvm_arch_destroy_vm+0x5f2/0x7c0 [ 35.822580] ? kvm_arch_sync_events+0x30/0x30 [ 35.827078] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 35.832634] ? mmu_notifier_unregister+0x474/0x600 [ 35.837558] ? trace_hardirqs_on+0x2c0/0x2c0 [ 35.841965] ? kfree+0x111/0x210 [ 35.845333] ? __mmu_notifier_register+0x30/0x30 [ 35.850097] ? __free_pages+0x10a/0x190 [ 35.854549] ? free_unref_page+0x930/0x930 [ 35.858791] kvm_put_kvm+0x73f/0x1060 [ 35.864668] ? kvm_write_guest_cached+0x40/0x40 [ 35.877134] ? _raw_spin_unlock_irq+0x27/0x70 [ 35.881636] ? _raw_spin_unlock_irq+0x27/0x70 [ 35.886135] ? lockdep_hardirqs_on+0x421/0x5c0 [ 35.890726] ? kasan_check_write+0x14/0x20 [ 35.894958] ? do_raw_spin_lock+0xc1/0x200 [ 35.899684] ? kvm_irqfd_release+0xdd/0x120 [ 35.904003] ? kvm_irqfd_release+0xdd/0x120 [ 35.908325] ? kvm_put_kvm+0x1060/0x1060 [ 35.912383] kvm_vm_release+0x42/0x50 [ 35.919689] __fput+0x38a/0xa40 [ 35.922995] ? __alloc_file+0x400/0x400 [ 35.926989] ? check_same_owner+0x340/0x340 [ 35.931308] ? kasan_check_write+0x14/0x20 [ 35.936289] ? do_raw_spin_lock+0xc1/0x200 [ 35.940525] ____fput+0x15/0x20 [ 35.943802] task_work_run+0x1e8/0x2a0 [ 35.947748] ? task_work_cancel+0x240/0x240 [ 35.952099] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 35.957650] ? switch_task_namespaces+0xa2/0xd0 [ 35.962321] do_exit+0x1ae4/0x26e0 [ 35.966205] ? mm_update_next_owner+0x9a0/0x9a0 [ 35.970886] ? kvm_vcpu_ioctl+0x2b5/0x1280 [ 35.975124] ? rcu_read_lock_sched_held+0x108/0x120 [ 35.980150] ? kfree+0x1d7/0x210 [ 35.983519] ? kvm_vcpu_ioctl+0x2ba/0x1280 [ 35.987751] ? kvm_uevent_notify_change.part.32+0x440/0x440 [ 35.993461] ? is_bpf_text_address+0xd7/0x170 [ 35.997955] ? kernel_text_address+0x79/0xf0 [ 36.002360] ? __kernel_text_address+0xd/0x40 [ 36.006852] ? unwind_get_return_address+0x61/0xa0 [ 36.011793] ? __save_stack_trace+0x8d/0xf0 [ 36.016145] ? save_stack+0xa9/0xd0 [ 36.019769] ? save_stack+0x43/0xd0 [ 36.023403] ? __kasan_slab_free+0x11a/0x170 [ 36.027816] ? kasan_slab_free+0xe/0x10 [ 36.031782] ? putname+0xf2/0x130 [ 36.035238] ? __x64_sys_openat+0x9d/0x100 [ 36.045897] ? do_syscall_64+0x1b9/0x820 [ 36.052893] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.058259] ? trace_hardirqs_off+0xb8/0x2b0 [ 36.063190] ? kasan_check_read+0x11/0x20 [ 36.067336] ? do_raw_spin_unlock+0xa7/0x2f0 [ 36.071745] ? trace_hardirqs_on+0x2c0/0x2c0 [ 36.076166] ? initcall_blacklisted+0x9a/0x1e0 [ 36.080774] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 36.085893] ? kvm_uevent_notify_change.part.32+0x440/0x440 [ 36.091614] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.097181] ? do_vfs_ioctl+0x201/0x1720 [ 36.101241] ? rcu_is_watching+0x8c/0x150 [ 36.105391] ? trace_hardirqs_on+0xbd/0x2c0 [ 36.109733] ? ioctl_preallocate+0x300/0x300 [ 36.114136] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.119670] ? __fget_light+0x2f7/0x440 [ 36.123658] ? fget_raw+0x20/0x20 [ 36.127125] ? putname+0xf2/0x130 [ 36.130597] ? rcu_read_lock_sched_held+0x108/0x120 [ 36.135623] ? kmem_cache_free+0x246/0x280 [ 36.139863] ? putname+0xf7/0x130 [ 36.143316] do_group_exit+0x177/0x440 [ 36.147203] ? trace_hardirqs_on+0xbd/0x2c0 [ 36.151519] ? __ia32_sys_exit+0x50/0x50 [ 36.155610] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 36.160715] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.166253] ? ksys_ioctl+0x81/0xd0 [ 36.169887] __x64_sys_exit_group+0x3e/0x50 [ 36.174212] do_syscall_64+0x1b9/0x820 [ 36.178098] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 36.183462] ? syscall_return_slowpath+0x5e0/0x5e0 [ 36.188385] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.193235] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 36.198251] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 36.203269] ? prepare_exit_to_usermode+0x291/0x3b0 [ 36.208288] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.213133] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.220941] RIP: 0033:0x43ecc8 [ 36.228675] Code: Bad RIP value. [ 36.232032] RSP: 002b:00007ffe370cc738 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 36.239749] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ecc8 [ 36.247023] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 36.254287] RBP: 00000000004be588 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 36.261556] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 36.268823] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 36.276111] [ 36.277762] Allocated by task 4749: [ 36.281409] save_stack+0x43/0xd0 [ 36.284866] kasan_kmalloc+0xc4/0xe0 [ 36.288601] kasan_slab_alloc+0x12/0x20 [ 36.292603] kmem_cache_alloc+0x12e/0x710 [ 36.296797] vmx_create_vcpu+0xcf/0x2830 [ 36.300848] kvm_arch_vcpu_create+0xe5/0x220 [ 36.305267] kvm_vm_ioctl+0x488/0x1d80 [ 36.309151] do_vfs_ioctl+0x1de/0x1720 [ 36.313034] ksys_ioctl+0xa9/0xd0 [ 36.316484] __x64_sys_ioctl+0x73/0xb0 [ 36.320366] do_syscall_64+0x1b9/0x820 [ 36.324255] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.329431] [ 36.331055] Freed by task 4749: [ 36.334336] save_stack+0x43/0xd0 [ 36.337794] __kasan_slab_free+0x11a/0x170 [ 36.342022] kasan_slab_free+0xe/0x10 [ 36.345815] kmem_cache_free+0x86/0x280 [ 36.349786] vmx_free_vcpu+0x26b/0x300 [ 36.353667] kvm_arch_destroy_vm+0x365/0x7c0 [ 36.358091] kvm_put_kvm+0x73f/0x1060 [ 36.361888] kvm_vm_release+0x42/0x50 [ 36.365681] __fput+0x38a/0xa40 [ 36.368951] ____fput+0x15/0x20 [ 36.372223] task_work_run+0x1e8/0x2a0 [ 36.376105] do_exit+0x1ae4/0x26e0 [ 36.380126] do_group_exit+0x177/0x440 [ 36.390881] __x64_sys_exit_group+0x3e/0x50 [ 36.398805] do_syscall_64+0x1b9/0x820 [ 36.402687] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.407866] [ 36.409507] The buggy address belongs to the object at ffff8801d9280040 [ 36.409507] which belongs to the cache kvm_vcpu of size 23872 [ 36.422073] The buggy address is located 24 bytes inside of [ 36.422073] 23872-byte region [ffff8801d9280040, ffff8801d9285d80) [ 36.434030] The buggy address belongs to the page: [ 36.438964] page:ffffea000764a000 count:1 mapcount:0 mapping:ffff8801d52c0b40 index:0x0 compound_mapcount: 0 [ 36.448929] flags: 0x2fffc0000008100(slab|head) [ 36.453597] raw: 02fffc0000008100 ffff8801d7318148 ffff8801d7318148 ffff8801d52c0b40 [ 36.461486] raw: 0000000000000000 ffff8801d9280040 0000000100000001 0000000000000000 [ 36.469848] page dumped because: kasan: bad access detected [ 36.475554] [ 36.477192] Memory state around the buggy address: [ 36.482114] ffff8801d927ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 36.489474] ffff8801d927ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 36.496828] >ffff8801d9280000: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 36.504191] ^ [ 36.510418] ffff8801d9280080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.517771] ffff8801d9280100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.525115] ================================================================== [ 36.532470] Kernel panic - not syncing: panic_on_warn set ... [ 36.532470] [ 36.539848] CPU: 1 PID: 4749 Comm: syz-executor333 Tainted: G B 4.19.0-rc1+ #217 [ 36.549189] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.558536] Call Trace: [ 36.561130] dump_stack+0x1c9/0x2b4 [ 36.564761] ? dump_stack_print_info.cold.2+0x52/0x52 [ 36.580297] ? lock_downgrade+0x8f0/0x8f0 [ 36.584452] ? __schedule+0xf54/0x1df0 [ 36.588347] panic+0x238/0x4e7 [ 36.591537] ? add_taint.cold.5+0x16/0x16 [ 36.595701] ? print_shadow_for_address+0xba/0x116 [ 36.600631] ? trace_hardirqs_off+0xaf/0x2b0 [ 36.605034] ? trace_hardirqs_off+0x77/0x2b0 [ 36.609441] ? __schedule+0xf54/0x1df0 [ 36.613327] kasan_end_report+0x47/0x4f [ 36.617303] kasan_report.cold.7+0x76/0x30d [ 36.621648] __asan_report_load8_noabort+0x14/0x20 [ 36.627058] __schedule+0xf54/0x1df0 [ 36.630770] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 36.635880] ? __sched_text_start+0x8/0x8 [ 36.640028] ? __call_srcu+0x7e7/0x1040 [ 36.644030] ? check_same_owner+0x340/0x340 [ 36.648363] ? mark_held_locks+0x160/0x160 [ 36.652594] ? find_held_lock+0x36/0x1c0 [ 36.656684] preempt_schedule_common+0x22/0x60 [ 36.661296] _cond_resched+0x1d/0x30 [ 36.665012] wait_for_completion+0xa5/0x8d0 [ 36.669339] ? wait_for_completion_interruptible+0x950/0x950 [ 36.675148] ? __lockdep_init_map+0x105/0x590 [ 36.679653] ? __init_waitqueue_head+0x9e/0x150 [ 36.684330] ? init_wait_entry+0x1c0/0x1c0 [ 36.688582] __synchronize_srcu+0x189/0x240 [ 36.693421] ? call_srcu+0x10/0x10 [ 36.697118] ? rcu_unexpedite_gp+0x20/0x20 [ 36.701358] synchronize_srcu+0x335/0x56f [ 36.705505] ? lock_downgrade+0x8f0/0x8f0 [ 36.709649] ? synchronize_srcu_expedited+0x20/0x20 [ 36.714665] ? kasan_check_read+0x11/0x20 [ 36.718820] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 36.723402] ? kasan_check_write+0x14/0x20 [ 36.733883] ? do_raw_spin_lock+0xc1/0x200 [ 36.742481] kvm_page_track_unregister_notifier+0x17d/0x250 [ 36.748684] ? kvm_slot_page_track_remove_page+0x70/0x70 [ 36.754131] ? kvfree+0x61/0x70 [ 36.757421] ? rcu_read_lock_sched_held+0x108/0x120 [ 36.762438] kvm_mmu_uninit_vm+0x1c/0x20 [ 36.766505] kvm_arch_destroy_vm+0x5f2/0x7c0 [ 36.770912] ? kvm_arch_sync_events+0x30/0x30 [ 36.775408] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 36.780948] ? mmu_notifier_unregister+0x474/0x600 [ 36.785875] ? trace_hardirqs_on+0x2c0/0x2c0 [ 36.790293] ? kfree+0x111/0x210 [ 36.793660] ? __mmu_notifier_register+0x30/0x30 [ 36.798931] ? __free_pages+0x10a/0x190 [ 36.802903] ? free_unref_page+0x930/0x930 [ 36.807156] kvm_put_kvm+0x73f/0x1060 [ 36.810963] ? kvm_write_guest_cached+0x40/0x40 [ 36.815638] ? _raw_spin_unlock_irq+0x27/0x70 [ 36.820130] ? _raw_spin_unlock_irq+0x27/0x70 [ 36.824628] ? lockdep_hardirqs_on+0x421/0x5c0 [ 36.829213] ? kasan_check_write+0x14/0x20 [ 36.833454] ? do_raw_spin_lock+0xc1/0x200 [ 36.837685] ? kvm_irqfd_release+0xdd/0x120 [ 36.842005] ? kvm_irqfd_release+0xdd/0x120 [ 36.846326] ? kvm_put_kvm+0x1060/0x1060 [ 36.850382] kvm_vm_release+0x42/0x50 [ 36.854704] __fput+0x38a/0xa40 [ 36.857980] ? __alloc_file+0x400/0x400 [ 36.861976] ? check_same_owner+0x340/0x340 [ 36.866295] ? kasan_check_write+0x14/0x20 [ 36.870537] ? do_raw_spin_lock+0xc1/0x200 [ 36.874768] ____fput+0x15/0x20 [ 36.878045] task_work_run+0x1e8/0x2a0 [ 36.881927] ? task_work_cancel+0x240/0x240 [ 36.886247] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 36.892278] ? switch_task_namespaces+0xa2/0xd0 [ 36.896943] do_exit+0x1ae4/0x26e0 [ 36.900996] ? mm_update_next_owner+0x9a0/0x9a0 [ 36.915633] ? kvm_vcpu_ioctl+0x2b5/0x1280 [ 36.922901] ? rcu_read_lock_sched_held+0x108/0x120 [ 36.927913] ? kfree+0x1d7/0x210 [ 36.931278] ? kvm_vcpu_ioctl+0x2ba/0x1280 [ 36.937046] ? kvm_uevent_notify_change.part.32+0x440/0x440 [ 36.942757] ? is_bpf_text_address+0xd7/0x170 [ 36.947246] ? kernel_text_address+0x79/0xf0 [ 36.952153] ? __kernel_text_address+0xd/0x40 [ 36.956647] ? unwind_get_return_address+0x61/0xa0 [ 36.961602] ? __save_stack_trace+0x8d/0xf0 [ 36.965938] ? save_stack+0xa9/0xd0 [ 36.974500] ? save_stack+0x43/0xd0 [ 36.978149] ? __kasan_slab_free+0x11a/0x170 [ 36.982576] ? kasan_slab_free+0xe/0x10 [ 36.987024] ? putname+0xf2/0x130 [ 36.990474] ? __x64_sys_openat+0x9d/0x100 [ 36.994709] ? do_syscall_64+0x1b9/0x820 [ 36.998770] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.004132] ? trace_hardirqs_off+0xb8/0x2b0 [ 37.008534] ? kasan_check_read+0x11/0x20 [ 37.012676] ? do_raw_spin_unlock+0xa7/0x2f0 [ 37.017077] ? trace_hardirqs_on+0x2c0/0x2c0 [ 37.021483] ? initcall_blacklisted+0x9a/0x1e0 [ 37.026080] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 37.031181] ? kvm_uevent_notify_change.part.32+0x440/0x440 [ 37.036889] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.042438] ? do_vfs_ioctl+0x201/0x1720 [ 37.046497] ? rcu_is_watching+0x8c/0x150 [ 37.051065] ? trace_hardirqs_on+0xbd/0x2c0 [ 37.055906] ? ioctl_preallocate+0x300/0x300 [ 37.060323] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.065860] ? __fget_light+0x2f7/0x440 [ 37.069833] ? fget_raw+0x20/0x20 [ 37.073289] ? putname+0xf2/0x130 [ 37.083883] ? rcu_read_lock_sched_held+0x108/0x120 [ 37.092413] ? kmem_cache_free+0x246/0x280 [ 37.096648] ? putname+0xf7/0x130 [ 37.100119] do_group_exit+0x177/0x440 [ 37.104006] ? trace_hardirqs_on+0xbd/0x2c0 [ 37.108331] ? __ia32_sys_exit+0x50/0x50 [ 37.112389] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 37.117489] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.123030] ? ksys_ioctl+0x81/0xd0 [ 37.126657] __x64_sys_exit_group+0x3e/0x50 [ 37.130992] do_syscall_64+0x1b9/0x820 [ 37.134882] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 37.140245] ? syscall_return_slowpath+0x5e0/0x5e0 [ 37.145173] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.150011] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 37.155022] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 37.160031] ? prepare_exit_to_usermode+0x291/0x3b0 [ 37.165051] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.169897] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.175084] RIP: 0033:0x43ecc8 [ 37.178277] Code: Bad RIP value. [ 37.181639] RSP: 002b:00007ffe370cc738 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 37.189345] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ecc8 [ 37.196606] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 37.203878] RBP: 00000000004be588 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 37.211140] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 37.218413] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 37.225682] [ 37.225687] ====================================================== [ 37.225692] WARNING: possible circular locking dependency detected [ 37.225696] 4.19.0-rc1+ #217 Not tainted [ 37.225701] ------------------------------------------------------ [ 37.225717] syz-executor333/4749 is trying to acquire lock: [ 37.225720] 00000000e8db5467 ((console_sem).lock){-...}, at: down_trylock+0x13/0x70 [ 37.225734] [ 37.225737] but task is already holding lock: [ 37.225740] 00000000b05db847 (report_lock){....}, at: kasan_report+0x8e/0x110 [ 37.225753] [ 37.225757] which lock already depends on the new lock. [ 37.225759] [ 37.225762] [ 37.225766] the existing dependency chain (in reverse order) is: [ 37.225768] [ 37.225770] -> #3 (report_lock){....}: [ 37.225798] _raw_spin_lock_irqsave+0x96/0xc0 [ 37.225801] kasan_report+0x8e/0x110 [ 37.225806] __asan_report_load8_noabort+0x14/0x20 [ 37.225809] __schedule+0xf54/0x1df0 [ 37.225813] preempt_schedule_common+0x22/0x60 [ 37.225817] _cond_resched+0x1d/0x30 [ 37.225821] wait_for_completion+0xa5/0x8d0 [ 37.225825] __synchronize_srcu+0x189/0x240 [ 37.225829] synchronize_srcu+0x335/0x56f [ 37.225834] kvm_page_track_unregister_notifier+0x17d/0x250 [ 37.225838] kvm_mmu_uninit_vm+0x1c/0x20 [ 37.225841] kvm_arch_destroy_vm+0x5f2/0x7c0 [ 37.225845] kvm_put_kvm+0x73f/0x1060 [ 37.225849] kvm_vm_release+0x42/0x50 [ 37.225852] __fput+0x38a/0xa40 [ 37.225862] ____fput+0x15/0x20 [ 37.225865] task_work_run+0x1e8/0x2a0 [ 37.225869] do_exit+0x1ae4/0x26e0 [ 37.225872] do_group_exit+0x177/0x440 [ 37.225876] __x64_sys_exit_group+0x3e/0x50 [ 37.225880] do_syscall_64+0x1b9/0x820 [ 37.225885] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.225887] [ 37.225889] -> #2 (&rq->lock){-.-.}: [ 37.225902] _raw_spin_lock+0x2a/0x40 [ 37.225906] task_fork_fair+0x93/0x680 [ 37.225910] sched_fork+0x44b/0xbd0 [ 37.225913] copy_process+0x235e/0x7ad0 [ 37.225917] _do_fork+0x1ca/0x1170 [ 37.225920] kernel_thread+0x34/0x40 [ 37.225924] rest_init+0x22/0xe4 [ 37.225928] start_kernel+0x913/0x94e [ 37.225932] x86_64_start_reservations+0x29/0x2b [ 37.225935] x86_64_start_kernel+0x76/0x79 [ 37.225939] secondary_startup_64+0xa4/0xb0 [ 37.225941] [ 37.225944] -> #1 (&p->pi_lock){-.-.}: [ 37.225957] _raw_spin_lock_irqsave+0x96/0xc0 [ 37.225961] try_to_wake_up+0xd2/0x1250 [ 37.225965] wake_up_process+0x10/0x20 [ 37.225968] __up.isra.1+0x1c0/0x2a0 [ 37.225972] up+0x13c/0x1c0 [ 37.225975] __up_console_sem+0xbe/0x1b0 [ 37.225992] console_unlock+0x506/0x10d0 [ 37.225996] vprintk_emit+0x33a/0x910 [ 37.226000] vprintk_default+0x28/0x30 [ 37.226015] vprintk_func+0x7a/0x117 [ 37.226018] printk+0xa7/0xcf [ 37.226022] do_exit.cold.22+0x120/0x21f [ 37.226026] do_group_exit+0x177/0x440 [ 37.226029] __x64_sys_exit_group+0x3e/0x50 [ 37.226033] do_syscall_64+0x1b9/0x820 [ 37.226054] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.226056] [ 37.226058] -> #0 ((console_sem).lock){-...}: [ 37.226072] lock_acquire+0x1e4/0x4f0 [ 37.226075] _raw_spin_lock_irqsave+0x96/0xc0 [ 37.226079] down_trylock+0x13/0x70 [ 37.226083] __down_trylock_console_sem+0xae/0x200 [ 37.226087] console_trylock+0x15/0xa0 [ 37.226090] vprintk_emit+0x31f/0x910 [ 37.226094] vprintk_default+0x28/0x30 [ 37.226109] vprintk_func+0x7a/0x117 [ 37.226112] printk+0xa7/0xcf [ 37.226116] kasan_report+0x9e/0x110 [ 37.226120] __asan_report_load8_noabort+0x14/0x20 [ 37.226137] __schedule+0xf54/0x1df0 [ 37.226141] preempt_schedule_common+0x22/0x60 [ 37.226145] _cond_resched+0x1d/0x30 [ 37.226149] wait_for_completion+0xa5/0x8d0 [ 37.226153] __synchronize_srcu+0x189/0x240 [ 37.226157] synchronize_srcu+0x335/0x56f [ 37.226162] kvm_page_track_unregister_notifier+0x17d/0x250 [ 37.226165] kvm_mmu_uninit_vm+0x1c/0x20 [ 37.226169] kvm_arch_destroy_vm+0x5f2/0x7c0 [ 37.226173] kvm_put_kvm+0x73f/0x1060 [ 37.226177] kvm_vm_release+0x42/0x50 [ 37.226180] __fput+0x38a/0xa40 [ 37.226184] ____fput+0x15/0x20 [ 37.226188] task_work_run+0x1e8/0x2a0 [ 37.226191] do_exit+0x1ae4/0x26e0 [ 37.226195] do_group_exit+0x177/0x440 [ 37.226199] __x64_sys_exit_group+0x3e/0x50 [ 37.226203] do_syscall_64+0x1b9/0x820 [ 37.226208] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.226210] [ 37.226214] other info that might help us debug this: [ 37.226216] [ 37.226219] Chain exists of: [ 37.226221] (console_sem).lock --> &rq->lock --> report_lock [ 37.226240] [ 37.226243] Possible unsafe locking scenario: [ 37.226246] [ 37.226250] CPU0 CPU1 [ 37.226254] ---- ---- [ 37.226256] lock(report_lock); [ 37.226265] lock(&rq->lock); [ 37.226274] lock(report_lock); [ 37.226282] lock((console_sem).lock); [ 37.226303] [ 37.226306] *** DEADLOCK *** [ 37.226308] [ 37.226312] 2 locks held by syz-executor333/4749: [ 37.226315] #0: 00000000870fe6b2 (&rq->lock){-.-.}, at: __schedule+0x24d/0x1df0 [ 37.226343] #1: 00000000b05db847 (report_lock){....}, at: kasan_report+0x8e/0x110 [ 37.226359] [ 37.226362] stack backtrace: [ 37.226367] CPU: 1 PID: 4749 Comm: syz-executor333 Not tainted 4.19.0-rc1+ #217 [ 37.226374] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.226376] Call Trace: [ 37.226380] dump_stack+0x1c9/0x2b4 [ 37.226384] ? dump_stack_print_info.cold.2+0x52/0x52 [ 37.226387] ? vprintk_func+0x100/0x117 [ 37.226392] print_circular_bug.isra.34.cold.55+0x1bd/0x27d [ 37.226395] ? save_trace+0xe0/0x290 [ 37.226399] __lock_acquire+0x3449/0x5020 [ 37.226403] ? mark_held_locks+0x160/0x160 [ 37.226406] ? mark_held_locks+0x160/0x160 [ 37.226410] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 37.226414] ? is_bpf_text_address+0xd7/0x170 [ 37.226418] ? kernel_text_address+0x79/0xf0 [ 37.226422] ? __kernel_text_address+0xd/0x40 [ 37.226425] ? __save_stack_trace+0x8d/0xf0 [ 37.226429] ? add_lock_to_list.isra.27+0x1ec/0x4b0 [ 37.226433] ? save_trace+0x290/0x290 [ 37.226436] ? save_stack_trace+0x1a/0x20 [ 37.226440] ? save_trace+0xe0/0x290 [ 37.226443] ? graph_lock+0x170/0x170 [ 37.226448] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 37.226451] lock_acquire+0x1e4/0x4f0 [ 37.226455] ? down_trylock+0x13/0x70 [ 37.226458] ? lock_release+0x9f0/0x9f0 [ 37.226462] ? trace_hardirqs_off+0xb8/0x2b0 [ 37.226466] ? trace_hardirqs_on+0x2c0/0x2c0 [ 37.226469] ? trace_hardirqs_off+0xb8/0x2b0 [ 37.226473] ? log_store+0x34f/0x4c0 [ 37.226476] ? vprintk_emit+0x31f/0x910 [ 37.226480] _raw_spin_lock_irqsave+0x96/0xc0 [ 37.226483] ? down_trylock+0x13/0x70 [ 37.226487] down_trylock+0x13/0x70 [ 37.226491] __down_trylock_console_sem+0xae/0x200 [ 37.226494] console_trylock+0x15/0xa0 [ 37.226498] vprintk_emit+0x31f/0x910 [ 37.226501] ? wake_up_klogd+0x110/0x110 [ 37.226505] ? run_rebalance_domains+0x4c0/0x4c0 [ 37.226509] ? kasan_check_read+0x11/0x20 [ 37.226512] ? rcu_is_watching+0x8c/0x150 [ 37.226516] ? rcu_pm_notify+0xc0/0xc0 [ 37.226519] ? lock_acquire+0x1e4/0x4f0 [ 37.226523] ? kasan_report+0x8e/0x110 [ 37.226526] ? __schedule+0xf54/0x1df0 [ 37.226530] vprintk_default+0x28/0x30 [ 37.226533] vprintk_func+0x7a/0x117 [ 37.226536] printk+0xa7/0xcf [ 37.226540] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 37.226544] ? kasan_check_write+0x14/0x20 [ 37.226548] ? do_raw_spin_lock+0xc1/0x200 [ 37.226551] ? do_raw_spin_lock+0xc1/0x200 [ 37.226555] kasan_report+0x9e/0x110 [ 37.226559] __asan_report_load8_noabort+0x14/0x20 [ 37.226562] __schedule+0xf54/0x1df0 [ 37.226566] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 37.226570] ? __sched_text_start+0x8/0x8 [ 37.226573] ? __call_srcu+0x7e7/0x1040 [ 37.226577] ? check_same_owner+0x340/0x340 [ 37.226581] ? mark_held_locks+0x160/0x160 [ 37.226584] ? find_held_lock+0x36/0x1c0 [ 37.226588] preempt_schedule_common+0x22/0x60 [ 37.226592] _cond_resched+0x1d/0x30 [ 37.226595] wait_for_completion+0xa5/0x8d0 [ 37.226600] ? wait_for_completion_interruptible+0x950/0x950 [ 37.226604] ? __lockdep_init_map+0x105/0x590 [ 37.226608] ? __init_waitqueue_head+0x9e/0x150 [ 37.226611] ? init_wait_entry+0x1c0/0x1c0 [ 37.226615] __synchronize_srcu+0x189/0x240 [ 37.226623] ? call_srcu+0x10/0x10 [ 37.226627] ? rcu_unexpedite_gp+0x20/0x20 [ 37.226631] synchronize_srcu+0x335/0x56f [ 37.226635] ? lock_downgrade+0x8f0/0x8f0 [ 37.226639] ? synchronize_srcu_expedited+0x20/0x20 [ 37.226642] ? kasan_check_read+0x11/0x20 [ 37.226646] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 37.226650] ? kasan_check_write+0x14/0x20 [ 37.226654] ? do_raw_spin_lock+0xc1/0x200 [ 37.226658] kvm_page_track_unregister_notifier+0x17d/0x250 [ 37.226662] ? kvm_slot_page_track_remove_page+0x70/0x70 [ 37.226665] ? kvfree+0x61/0x70 [ 37.226669] ? rcu_read_lock_sched_held+0x108/0x120 [ 37.226673] kvm_mmu_uninit_vm+0x1c/0x20 [ 37.226677] kvm_arch_destroy_vm+0x5f2/0x7c0 [ 37.226681] ? kvm_arch_sync_events+0x30/0x30 [ 37.226685] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 37.226689] ? mmu_notifier_unregister+0x474/0x600 [ 37.226693] ? trace_hardirqs_on+0x2c0/0x2c0 [ 37.226696] ? kfree+0x111/0x210 [ 37.226700] ? __mmu_notifier_register+0x30/0x30 [ 37.226703] ? __free_pages+0x10a/0x190 [ 37.226707] ? free_unref_page+0x930/0x930 [ 37.226710] kvm_put_kvm+0x73f/0x1060 [ 37.226714] ? kvm_write_guest_cached+0x40/0x40 [ 37.226718] ? _raw_spin_unlock_irq+0x27/0x70 [ 37.226722] ? _raw_spin_unlock_irq+0x27/0x70 [ 37.226726] ? lockdep_hardirqs_on+0x421/0x5c0 [ 37.226729] ? kasan_check_write+0x14/0x20 [ 37.226733] ? do_raw_spin_lock+0xc1/0x200 [ 37.226737] ? kvm_irqfd_release+0xdd/0x120 [ 37.226741] ? kvm_irqfd_release+0xdd/0x120 [ 37.226744] ? kvm_put_kvm+0x1060/0x1060 [ 37.226748] kvm_vm_release+0x42/0x50 [ 37.226751] __fput+0x38a/0xa40 [ 37.226754] ? __alloc_file+0x400/0x400 [ 37.226758] ? check_same_owner+0x340/0x340 [ 37.226762] ? kasan_check_write+0x14/0x20 [ 37.226765] ? do_raw_spin_lock+0xc1/0x200 [ 37.226769] ____fput+0x15/0x20 [ 37.226772] task_work_run+0x1e8/0x2a0 [ 37.226776] ? task_work_cancel+0x240/0x240 [ 37.226780] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 37.226784] ? switch_task_namespaces+0xa2/0xd0 [ 37.226787] do_exit+0x1ae4/0x26e0 [ 37.226791] ? mm_update_next_owner+0x9a0/0x9a0 [ 37.226795] ? kvm_vcpu_ioctl+0x2b5/0x1280 [ 37.226799] ? rcu_read_lock_sched_held+0x108/0x120 [ 37.226802] ? kfree+0x1d7/0x210 [ 37.226806] ? kvm_vcpu_ioctl+0x2ba/0x1280 [ 37.226810] ? kvm_uevent_notify_change.part.32+0x440/0x440 [ 37.226813] ? is_bpf_tex [ 37.226820] Lost 56 message(s)! [ 38.403258] Shutting down cpus with NMI [ 39.509168] Dumping ftrace buffer: [ 39.512700] (ftrace buffer empty) [ 39.516397] Kernel Offset: disabled [ 39.520023] Rebooting in 86400 seconds..