BUG: spinlock cpu recursion on CPU, syz-executor

Title	Replies (including bot)	Last reply
Reminder: 25 open syzbot bugs in kvm subsystem	1 (1)	2019/07/24 01:43
Reminder: 25 open syzbot bugs in kvm subsystem	1 (1)	2019/06/24 05:21
BUG: spinlock cpu recursion on CPU, syz-executor	0 (1)	2018/11/07 01:38

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.14	BUG: spinlock cpu recursion on CPU, syz-executor	4				1	1820d	1820d	0/1	auto-closed as invalid on 2020/11/23 20:37

Kernel

Title

Rank 🛈

linux-4.14

BUG: spinlock cpu recursion on CPU, syz-executor

1820d

0/1

auto-closed as invalid on 2020/11/23 20:37

Created	Duration	User	Patch	Repo	Result
2022/08/30 16:27	15m	retest repro		upstream	OK log

Created

Duration

User

Patch

Repo

Result

2022/08/30 16:27

15m

retest repro

upstream

OK log

IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 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. BUG: spinlock cpu recursion on CPU#0, syz-executor0/8023 lock: 0xffffc900045ea000, .magic: dead4ead, .owner: <none>/-1, .owner_cpu: 0 CPU: 0 PID: 8023 Comm: syz-executor0 Not tainted 4.20.0-rc1+ #99 kobject: 'kvm' (00000000968c974f): kobject_uevent_env Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kobject: 'kvm' (00000000968c974f): kobject_uevent_env Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 spin_dump.cold.3+0x81/0xe7 kernel/locking/spinlock_debug.c:67 kobject: 'kvm' (00000000968c974f): fill_kobj_path: path = '/devices/virtual/misc/kvm' spin_bug kernel/locking/spinlock_debug.c:75 [inline] debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline] do_raw_spin_lock+0x26a/0x350 kernel/locking/spinlock_debug.c:112 kobject: 'loop2' (000000000bdb293a): kobject_uevent_env __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_lock+0x35/0x40 kernel/locking/spinlock.c:144 kobject: 'loop2' (000000000bdb293a): fill_kobj_path: path = '/devices/virtual/block/loop2' spin_lock include/linux/spinlock.h:329 [inline] kvm_mmu_change_mmu_pages+0xf3/0x450 arch/x86/kvm/mmu.c:2717 kobject: 'kvm' (00000000968c974f): kobject_uevent_env kvm_arch_commit_memory_region+0x289/0x2d0 arch/x86/kvm/x86.c:9322 kobject: 'kvm' (00000000968c974f): fill_kobj_path: path = '/devices/virtual/misc/kvm' __kvm_set_memory_region+0x1c99/0x2d50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1064 kobject: 'kvm' (00000000968c974f): kobject_uevent_env kobject: 'kvm' (00000000968c974f): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (00000000968c974f): kobject_uevent_env kvm_set_memory_region+0x2e/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1085 kobject: 'kvm' (00000000968c974f): kobject_uevent_env kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1097 [inline] kvm_vm_ioctl+0x652/0x1d60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2995 kobject: 'loop3' (0000000005b5310e): kobject_uevent_env kobject: 'kvm' (00000000968c974f): kobject_uevent_env kobject: 'kvm' (00000000968c974f): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (00000000968c974f): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (00000000968c974f): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (00000000968c974f): fill_kobj_path: path = '/devices/virtual/misc/kvm' vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696 kobject: 'loop3' (0000000005b5310e): fill_kobj_path: path = '/devices/virtual/block/loop3' ------------[ cut here ]------------ downgrading a read lock WARNING: CPU: 1 PID: 5667 at kernel/locking/lockdep.c:3556 __lock_downgrade kernel/locking/lockdep.c:3556 [inline] WARNING: CPU: 1 PID: 5667 at kernel/locking/lockdep.c:3556 lock_downgrade+0x4d7/0x900 kernel/locking/lockdep.c:3819