watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor:4147]
Modules linked in:
irq event stamp: 50710
hardirqs last  enabled at (50709): [<ffff8000111a3964>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:81 [inline]
hardirqs last  enabled at (50709): [<ffff8000111a3964>] exit_to_kernel_mode+0xe0/0x168 arch/arm64/kernel/entry-common.c:91
hardirqs last disabled at (50710): [<ffff8000111a3bbc>] enter_el1_irq_or_nmi+0x10/0x1c arch/arm64/kernel/entry-common.c:227
softirqs last  enabled at (45970): [<ffff80000f720e30>] pneigh_ifdown_and_unlock net/core/neighbour.c:807 [inline]
softirqs last  enabled at (45970): [<ffff80000f720e30>] __neigh_ifdown+0x184/0x348 net/core/neighbour.c:392
softirqs last disabled at (45968): [<ffff80000f720cf0>] __neigh_ifdown+0x44/0x348 net/core/neighbour.c:390
CPU: 1 PID: 4147 Comm: syz-executor Not tainted 5.15.182-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : csd_lock_wait kernel/smp.c:440 [inline]
pc : smp_call_function_single+0x224/0x4a8 kernel/smp.c:758
lr : csd_lock_wait kernel/smp.c:440 [inline]
lr : smp_call_function_single+0x23c/0x4a8 kernel/smp.c:758
sp : ffff80001f6d7340
x29: ffff80001f6d73c0 x28: 1fffe00018d32001 x27: dfff800000000000
x26: ffff700003edae68 x25: 0000000000000000 x24: 0000000000000001
x23: ffff80001f6d7360 x22: ffff0000c6990008 x21: 0000000000000011
x20: ffff80001f6d7368 x19: 0000000000000000 x18: 1fffe0003422398e
x17: 1fffe0003422398e x16: ffff8000111a53fc x15: ffff8000141eec20
x14: ffff0001a111cc80 x13: 0000000000000000 x12: 0000000000ff0100
x11: 0000000000000001 x10: 0000000000000000 x9 : 0000000000000000
x8 : 0000000000000011 x7 : 0000000000000011 x6 : 0000000000000000
x5 : ffff80001f6d7380 x4 : ffff800013b34000 x3 : ffff8000083ca8d0
x2 : 0000000000000000 x1 : 0000000000000004 x0 : 0000000000000001
Call trace:
 __cmpwait_case_32 arch/arm64/include/asm/cmpxchg.h:252 [inline]
 __cmpwait arch/arm64/include/asm/cmpxchg.h:278 [inline]
 csd_lock_wait kernel/smp.c:440 [inline]
 smp_call_function_single+0x224/0x4a8 kernel/smp.c:758
 rcu_barrier+0x140/0x49c kernel/rcu/tree.c:4078
 netdev_wait_allrefs net/core/dev.c:10592 [inline]
 netdev_run_todo+0x594/0x9cc net/core/dev.c:10681
 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:112
 nsim_destroy+0xb4/0x164 drivers/net/netdevsim/netdev.c:387
 __nsim_dev_port_del+0x144/0x1a4 drivers/net/netdevsim/dev.c:1349
 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1362 [inline]
 nsim_dev_reload_destroy+0x144/0x204 drivers/net/netdevsim/dev.c:1561
 nsim_dev_remove+0x5c/0x108 drivers/net/netdevsim/dev.c:1577
 nsim_bus_remove+0x20/0x30 drivers/net/netdevsim/bus.c:381
 __device_release_driver drivers/base/dd.c:1227 [inline]
 device_release_driver_internal+0x3c0/0x63c drivers/base/dd.c:1262
 device_release_driver+0x28/0x38 drivers/base/dd.c:1285
 bus_remove_device+0x294/0x388 drivers/base/bus.c:531
 device_del+0x568/0x964 drivers/base/core.c:3600
 device_unregister+0x2c/0xcc drivers/base/core.c:3633
 nsim_bus_dev_del drivers/net/netdevsim/bus.c:454 [inline]
 del_device_store+0x25c/0x33c drivers/net/netdevsim/bus.c:354
 bus_attr_store+0x80/0xa4 drivers/base/bus.c:124
 sysfs_kf_write+0x1f8/0x278 fs/sysfs/file.c:139
 kernfs_fop_write_iter+0x320/0x478 fs/kernfs/file.c:296
 call_write_iter include/linux/fs.h:2172 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x7c8/0xa2c fs/read_write.c:594
 ksys_write+0x120/0x210 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:656
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584