watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor:4588] Modules linked in: irq event stamp: 51586 hardirqs last enabled at (51585): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:81 [inline] hardirqs last enabled at (51585): [] exit_to_kernel_mode+0xe0/0x168 arch/arm64/kernel/entry-common.c:91 hardirqs last disabled at (51586): [] enter_el1_irq_or_nmi+0x10/0x1c arch/arm64/kernel/entry-common.c:227 softirqs last enabled at (47232): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31 softirqs last disabled at (47230): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18 CPU: 1 PID: 4588 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : csd_lock_wait kernel/smp.c:440 [inline] pc : smp_call_function_single+0x230/0x4c4 kernel/smp.c:758 lr : csd_lock_wait kernel/smp.c:440 [inline] lr : smp_call_function_single+0x248/0x4c4 kernel/smp.c:758 sp : ffff800020047360 x29: ffff8000200473f0 x28: 1fffe0001aa916d1 x27: dfff800000000000 x26: ffff700004008e6c x25: 0000000000000000 x24: 0000000000000001 x23: ffff800020047380 x22: ffff0000d548b688 x21: 0000000000000011 x20: ffff800020047388 x19: 0000000000000000 x18: 0000000000000002 x17: 0000000040000000 x16: ffff80001134c7a0 x15: 000000000004ffff x14: 0000000000000001 x13: 1ffff00004008e71 x12: 0000000000000000 x11: ff808000083d42b4 x10: 0000000000000000 x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000011 x6 : 0000000000000000 x5 : ffff8000200473a0 x4 : ffff800013d72a20 x3 : ffff8000083d42a8 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+0x230/0x4c4 kernel/smp.c:758 rcu_barrier+0x21c/0x4b0 kernel/rcu/tree.c:4082 netdev_wait_allrefs net/core/dev.c:10618 [inline] netdev_run_todo+0x5b4/0x9e0 net/core/dev.c:10707 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:112 nsim_destroy+0xb4/0x164 drivers/net/netdevsim/netdev.c:387 __nsim_dev_port_del+0x14c/0x1b0 drivers/net/netdevsim/dev.c:1349 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1362 [inline] nsim_dev_reload_destroy+0x144/0x208 drivers/net/netdevsim/dev.c:1561 nsim_dev_remove+0x5c/0x130 drivers/net/netdevsim/dev.c:1577 nsim_bus_remove+0x20/0x30 drivers/net/netdevsim/bus.c:381 __device_release_driver drivers/base/dd.c:1247 [inline] device_release_driver_internal+0x3c0/0x650 drivers/base/dd.c:1282 device_release_driver+0x28/0x38 drivers/base/dd.c:1305 bus_remove_device+0x294/0x384 drivers/base/bus.c:531 device_del+0x580/0x990 drivers/base/core.c:3615 device_unregister+0x2c/0xc8 drivers/base/core.c:3660 nsim_bus_dev_del drivers/net/netdevsim/bus.c:454 [inline] del_device_store+0x268/0x350 drivers/net/netdevsim/bus.c:354 bus_attr_store+0x80/0xa4 drivers/base/bus.c:124 sysfs_kf_write+0x1f8/0x274 fs/sysfs/file.c:139 kernfs_fop_write_iter+0x368/0x46c fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2173 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x590/0xa64 fs/read_write.c:594 ksys_write+0x12c/0x228 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+0x98/0x28c arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x5c/0x140 arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1d0 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