Extracting prog: 8m5.296605888s
Minimizing prog: 1h3m47.530518774s
Simplifying prog options: 21m49.8826239s
Extracting C: 5m23.680787283s
Simplifying C: 0s


extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-bind$vsock_stream-connect$vsock_stream-listen-accept4$unix
detailed listing:
executing program 0:
r0 = socket(0x28, 0x5, 0x0)
bind$vsock_stream(r0, &(0x7f0000000040)={0x28, 0x0, 0x0, @local}, 0x10)
connect$vsock_stream(r0, &(0x7f00000001c0), 0x10)
listen(r0, 0x0)
accept4$unix(r0, 0x0, 0x0, 0x0)

program did not crash
single: failed to extract reproducer
single: executing 1 programs separately with timeout 6m0s
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-bind$vsock_stream-connect$vsock_stream-listen-accept4$unix
detailed listing:
executing program 0:
r0 = socket(0x28, 0x5, 0x0)
bind$vsock_stream(r0, &(0x7f0000000040)={0x28, 0x0, 0x0, @local}, 0x10)
connect$vsock_stream(r0, &(0x7f00000001c0), 0x10)
listen(r0, 0x0)
accept4$unix(r0, 0x0, 0x0, 0x0)

program crashed: BUG: MAX_LOCKDEP_CHAINS too low!
single: successfully extracted reproducer
found reproducer with 5 syscalls
minimizing guilty program
testing program (duration=8m58.967828319s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-bind$vsock_stream-connect$vsock_stream-listen
detailed listing:
executing program 0:
r0 = socket(0x28, 0x5, 0x0)
bind$vsock_stream(r0, &(0x7f0000000040)={0x28, 0x0, 0x0, @local}, 0x10)
connect$vsock_stream(r0, &(0x7f00000001c0), 0x10)
listen(r0, 0x0)

program did not crash
testing program (duration=8m58.967828319s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-bind$vsock_stream-connect$vsock_stream-accept4$unix
detailed listing:
executing program 0:
r0 = socket(0x28, 0x5, 0x0)
bind$vsock_stream(r0, &(0x7f0000000040)={0x28, 0x0, 0x0, @local}, 0x10)
connect$vsock_stream(r0, &(0x7f00000001c0), 0x10)
accept4$unix(r0, 0x0, 0x0, 0x0)

program did not crash
testing program (duration=8m58.967828319s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-bind$vsock_stream-listen-accept4$unix
detailed listing:
executing program 0:
r0 = socket(0x28, 0x5, 0x0)
bind$vsock_stream(r0, &(0x7f0000000040)={0x28, 0x0, 0x0, @local}, 0x10)
listen(r0, 0x0)
accept4$unix(r0, 0x0, 0x0, 0x0)

program did not crash
testing program (duration=8m58.967828319s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-connect$vsock_stream-listen-accept4$unix
detailed listing:
executing program 0:
r0 = socket(0x28, 0x5, 0x0)
connect$vsock_stream(r0, &(0x7f00000001c0), 0x10)
listen(r0, 0x0)
accept4$unix(r0, 0x0, 0x0, 0x0)

program did not crash
testing program (duration=8m58.967828319s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): bind$vsock_stream-connect$vsock_stream-listen-accept4$unix
detailed listing:
executing program 0:
bind$vsock_stream(0xffffffffffffffff, &(0x7f0000000040)={0x28, 0x0, 0x0, @local}, 0x10)
connect$vsock_stream(0xffffffffffffffff, &(0x7f00000001c0), 0x10)
listen(0xffffffffffffffff, 0x0)
accept4$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)

program did not crash
testing program (duration=8m58.967828319s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-bind$vsock_stream-connect$vsock_stream-listen-accept4$unix
detailed listing:
executing program 0:
r0 = socket(0x28, 0x5, 0x0)
bind$vsock_stream(r0, 0x0, 0x0)
connect$vsock_stream(r0, &(0x7f00000001c0), 0x10)
listen(r0, 0x0)
accept4$unix(r0, 0x0, 0x0, 0x0)

program did not crash
testing program (duration=8m58.967828319s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-bind$vsock_stream-connect$vsock_stream-listen-accept4$unix
detailed listing:
executing program 0:
r0 = socket(0x28, 0x5, 0x0)
bind$vsock_stream(r0, &(0x7f0000000040)={0x28, 0x0, 0x0, @local}, 0x10)
connect$vsock_stream(r0, 0x0, 0x0)
listen(r0, 0x0)
accept4$unix(r0, 0x0, 0x0, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=8m58.967828319s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-bind$vsock_stream-connect$vsock_stream-listen-accept4$unix
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
simplifying guilty program options
testing program (duration=8m58.967828319s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-bind$vsock_stream-connect$vsock_stream-listen-accept4$unix
detailed listing:
executing program 0:
r0 = socket(0x28, 0x5, 0x0)
bind$vsock_stream(r0, &(0x7f0000000040)={0x28, 0x0, 0x0, @local}, 0x10)
connect$vsock_stream(r0, &(0x7f00000001c0), 0x10)
listen(r0, 0x0)
accept4$unix(r0, 0x0, 0x0, 0x0)

program crashed: BUG: MAX_LOCKDEP_CHAINS too low!
extracting C reproducer
testing compiled C program (duration=8m58.967828319s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-bind$vsock_stream-connect$vsock_stream-listen-accept4$unix
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
testing program (duration=8m58.967828319s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-bind$vsock_stream-connect$vsock_stream-listen-accept4$unix
detailed listing:
executing program 0:
r0 = socket(0x28, 0x5, 0x0)
bind$vsock_stream(r0, &(0x7f0000000040)={0x28, 0x0, 0x0, @local}, 0x10)
connect$vsock_stream(r0, &(0x7f00000001c0), 0x10)
listen(r0, 0x0)
accept4$unix(r0, 0x0, 0x0, 0x0)

program did not crash
testing program (duration=8m58.967828319s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-bind$vsock_stream-connect$vsock_stream-listen-accept4$unix
detailed listing:
executing program 0:
r0 = socket(0x28, 0x5, 0x0)
bind$vsock_stream(r0, &(0x7f0000000040)={0x28, 0x0, 0x0, @local}, 0x10)
connect$vsock_stream(r0, &(0x7f00000001c0), 0x10)
listen(r0, 0x0)
accept4$unix(r0, 0x0, 0x0, 0x0)

program crashed: BUG: MAX_LOCKDEP_CHAINS too low!
validation run: crashed=true
testing program (duration=8m58.967828319s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-bind$vsock_stream-connect$vsock_stream-listen-accept4$unix
detailed listing:
executing program 0:
r0 = socket(0x28, 0x5, 0x0)
bind$vsock_stream(r0, &(0x7f0000000040)={0x28, 0x0, 0x0, @local}, 0x10)
connect$vsock_stream(r0, &(0x7f00000001c0), 0x10)
listen(r0, 0x0)
accept4$unix(r0, 0x0, 0x0, 0x0)

program crashed: BUG: MAX_LOCKDEP_CHAINS too low!
validation run: crashed=true
testing program (duration=8m58.967828319s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket-bind$vsock_stream-connect$vsock_stream-listen-accept4$unix
detailed listing:
executing program 0:
r0 = socket(0x28, 0x5, 0x0)
bind$vsock_stream(r0, &(0x7f0000000040)={0x28, 0x0, 0x0, @local}, 0x10)
connect$vsock_stream(r0, &(0x7f00000001c0), 0x10)
listen(r0, 0x0)
accept4$unix(r0, 0x0, 0x0, 0x0)

program crashed: BUG: MAX_LOCKDEP_CHAINS too low!
validation run: crashed=true
reproducing took 1h57m47.569028893s
repro crashed as (corrupted=false):
Cannot create hsr debugfs directory
netdevsim netdevsim3 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim3 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 UID: 0 PID: 5422 Comm: syz-executor Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 add_chain_cache kernel/locking/lockdep.c:-1 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3855 [inline]
 validate_chain kernel/locking/lockdep.c:3876 [inline]
 __lock_acquire+0xfdc/0x2ebc kernel/locking/lockdep.c:5237
 lock_acquire+0x140/0x364 kernel/locking/lockdep.c:5868
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
 _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:166
 percpu_counter_destroy_many+0xc8/0x274 lib/percpu_counter.c:242
 __mmdrop+0x2bc/0x36c kernel/fork.c:740
 mmdrop include/linux/sched/mm.h:55 [inline]
 mmdrop_sched include/linux/sched/mm.h:83 [inline]
 mmdrop_lazy_tlb_sched include/linux/sched/mm.h:110 [inline]
 finish_task_switch+0x7b4/0x858 kernel/sched/core.c:5392
 context_switch kernel/sched/core.c:5513 [inline]
 __schedule+0x1374/0x2d80 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0x13c/0x20c kernel/sched/core.c:7326
 synchronize_rcu_expedited+0x4c8/0x66c kernel/rcu/tree_exp.h:976
 synchronize_net+0x88/0xa4 net/core/dev.c:12276
 unregister_netdevice_many_notify+0xb1c/0x1760 net/core/dev.c:12428
 unregister_netdevice_many net/core/dev.c:12509 [inline]
 unregister_netdevice_queue+0x274/0x30c net/core/dev.c:12320
 unregister_netdevice include/linux/netdevice.h:3474 [inline]
 nsim_destroy+0x248/0x5f8 drivers/net/netdevsim/netdev.c:1196
 __nsim_dev_port_del+0x13c/0x1ec drivers/net/netdevsim/dev.c:1547
 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1561 [inline]
 nsim_dev_reload_destroy+0x13c/0x210 drivers/net/netdevsim/dev.c:1785
 nsim_drv_remove+0x5c/0x114 drivers/net/netdevsim/dev.c:1800
 nsim_bus_remove+0x20/0x30 drivers/net/netdevsim/bus.c:427
 device_remove+0xc4/0x134 drivers/base/dd.c:616
 __device_release_driver drivers/base/dd.c:1349 [inline]
 device_release_driver_internal+0x124/0x20c drivers/base/dd.c:1372
 device_release_driver+0x28/0x38 drivers/base/dd.c:1395
 bus_remove_device+0x2d0/0x400 drivers/base/bus.c:664
 device_del+0x3ec/0x71c drivers/base/core.c:3961
 device_unregister+0x2c/0xf0 drivers/base/core.c:4002
 nsim_bus_dev_del+0x60/0x8c drivers/net/netdevsim/bus.c:491
 del_device_store+0x24c/0x2d4 drivers/net/netdevsim/bus.c:244
 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172
 sysfs_kf_write+0xe0/0x108 fs/sysfs/file.c:145
 kernfs_fop_write_iter+0x260/0x3b8 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x51c/0xa0c fs/read_write.c:687
 ksys_write+0x12c/0x228 fs/read_write.c:739
 __do_sys_write fs/read_write.c:750 [inline]
 __se_sys_write fs/read_write.c:747 [inline]
 __arm64_sys_write+0x84/0x98 fs/read_write.c:747
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590
netdevsim netdevsim3 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim3 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim3 netdevsim0: renamed from eth0
8021q: adding VLAN 0 to HW filter on device netdevsim0
netdevsim netdevsim3 netdevsim1: renamed from eth1
8021q: adding VLAN 0 to HW filter on device netdevsim1
netdevsim netdevsim3 netdevsim2: renamed from eth2
8021q: adding VLAN 0 to HW filter on device netdevsim2
netdevsim netdevsim3 netdevsim3: renamed from eth3
8021q: adding VLAN 0 to HW filter on device netdevsim3
bridge0: port 2(bridge_slave_1) entered blocking state
bridge0: port 2(bridge_slave_1) entered forwarding state
bridge0: port 1(bridge_slave_0) entered blocking state
bridge0: port 1(bridge_slave_0) entered forwarding state
8021q: adding VLAN 0 to HW filter on device bond0
8021q: adding VLAN 0 to HW filter on device team0
hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network
hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network
8021q: adding VLAN 0 to HW filter on device batadv0
veth0_vlan: entered promiscuous mode
veth1_vlan: entered promiscuous mode
veth0_macvtap: entered promiscuous mode
veth1_macvtap: entered promiscuous mode
batman_adv: batadv0: Interface activated: batadv_slave_0
batman_adv: batadv0: Interface activated: batadv_slave_1
ieee80211 phy207: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy208: Selected rate control algorithm 'minstrel_ht'

final repro crashed as (corrupted=false):
Cannot create hsr debugfs directory
netdevsim netdevsim3 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim3 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 UID: 0 PID: 5422 Comm: syz-executor Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 add_chain_cache kernel/locking/lockdep.c:-1 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3855 [inline]
 validate_chain kernel/locking/lockdep.c:3876 [inline]
 __lock_acquire+0xfdc/0x2ebc kernel/locking/lockdep.c:5237
 lock_acquire+0x140/0x364 kernel/locking/lockdep.c:5868
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
 _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:166
 percpu_counter_destroy_many+0xc8/0x274 lib/percpu_counter.c:242
 __mmdrop+0x2bc/0x36c kernel/fork.c:740
 mmdrop include/linux/sched/mm.h:55 [inline]
 mmdrop_sched include/linux/sched/mm.h:83 [inline]
 mmdrop_lazy_tlb_sched include/linux/sched/mm.h:110 [inline]
 finish_task_switch+0x7b4/0x858 kernel/sched/core.c:5392
 context_switch kernel/sched/core.c:5513 [inline]
 __schedule+0x1374/0x2d80 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0x13c/0x20c kernel/sched/core.c:7326
 synchronize_rcu_expedited+0x4c8/0x66c kernel/rcu/tree_exp.h:976
 synchronize_net+0x88/0xa4 net/core/dev.c:12276
 unregister_netdevice_many_notify+0xb1c/0x1760 net/core/dev.c:12428
 unregister_netdevice_many net/core/dev.c:12509 [inline]
 unregister_netdevice_queue+0x274/0x30c net/core/dev.c:12320
 unregister_netdevice include/linux/netdevice.h:3474 [inline]
 nsim_destroy+0x248/0x5f8 drivers/net/netdevsim/netdev.c:1196
 __nsim_dev_port_del+0x13c/0x1ec drivers/net/netdevsim/dev.c:1547
 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1561 [inline]
 nsim_dev_reload_destroy+0x13c/0x210 drivers/net/netdevsim/dev.c:1785
 nsim_drv_remove+0x5c/0x114 drivers/net/netdevsim/dev.c:1800
 nsim_bus_remove+0x20/0x30 drivers/net/netdevsim/bus.c:427
 device_remove+0xc4/0x134 drivers/base/dd.c:616
 __device_release_driver drivers/base/dd.c:1349 [inline]
 device_release_driver_internal+0x124/0x20c drivers/base/dd.c:1372
 device_release_driver+0x28/0x38 drivers/base/dd.c:1395
 bus_remove_device+0x2d0/0x400 drivers/base/bus.c:664
 device_del+0x3ec/0x71c drivers/base/core.c:3961
 device_unregister+0x2c/0xf0 drivers/base/core.c:4002
 nsim_bus_dev_del+0x60/0x8c drivers/net/netdevsim/bus.c:491
 del_device_store+0x24c/0x2d4 drivers/net/netdevsim/bus.c:244
 bus_attr_store+0x80/0xa4 drivers/base/bus.c:172
 sysfs_kf_write+0xe0/0x108 fs/sysfs/file.c:145
 kernfs_fop_write_iter+0x260/0x3b8 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x51c/0xa0c fs/read_write.c:687
 ksys_write+0x12c/0x228 fs/read_write.c:739
 __do_sys_write fs/read_write.c:750 [inline]
 __se_sys_write fs/read_write.c:747 [inline]
 __arm64_sys_write+0x84/0x98 fs/read_write.c:747
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590
netdevsim netdevsim3 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim3 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim3 netdevsim0: renamed from eth0
8021q: adding VLAN 0 to HW filter on device netdevsim0
netdevsim netdevsim3 netdevsim1: renamed from eth1
8021q: adding VLAN 0 to HW filter on device netdevsim1
netdevsim netdevsim3 netdevsim2: renamed from eth2
8021q: adding VLAN 0 to HW filter on device netdevsim2
netdevsim netdevsim3 netdevsim3: renamed from eth3
8021q: adding VLAN 0 to HW filter on device netdevsim3
bridge0: port 2(bridge_slave_1) entered blocking state
bridge0: port 2(bridge_slave_1) entered forwarding state
bridge0: port 1(bridge_slave_0) entered blocking state
bridge0: port 1(bridge_slave_0) entered forwarding state
8021q: adding VLAN 0 to HW filter on device bond0
8021q: adding VLAN 0 to HW filter on device team0
hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network
hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network
8021q: adding VLAN 0 to HW filter on device batadv0
veth0_vlan: entered promiscuous mode
veth1_vlan: entered promiscuous mode
veth0_macvtap: entered promiscuous mode
veth1_macvtap: entered promiscuous mode
batman_adv: batadv0: Interface activated: batadv_slave_0
batman_adv: batadv0: Interface activated: batadv_slave_1
ieee80211 phy207: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy208: Selected rate control algorithm 'minstrel_ht'