watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz.2.42:6869]
Modules linked in:
irq event stamp: 256320
hardirqs last  enabled at (256319): [<ffff80008b028df8>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last  enabled at (256319): [<ffff80008b028df8>] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194
hardirqs last disabled at (256320): [<ffff80008b001cbc>] __el1_irq arch/arm64/kernel/entry-common.c:650 [inline]
hardirqs last disabled at (256320): [<ffff80008b001cbc>] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:668
softirqs last  enabled at (256310): [<ffff8000803d88a0>] softirq_handle_end kernel/softirq.c:425 [inline]
softirqs last  enabled at (256310): [<ffff8000803d88a0>] handle_softirqs+0xaf8/0xc88 kernel/softirq.c:607
softirqs last disabled at (256289): [<ffff800080022028>] __do_softirq+0x14/0x20 kernel/softirq.c:613
CPU: 0 UID: 0 PID: 6869 Comm: syz.2.42 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : skip_mnt_tree fs/namespace.c:-1 [inline]
pc : commit_tree fs/namespace.c:1201 [inline]
pc : attach_recursive_mnt+0x1414/0x19f0 fs/namespace.c:2716
lr : skip_mnt_tree fs/namespace.c:1184 [inline]
lr : commit_tree fs/namespace.c:1201 [inline]
lr : attach_recursive_mnt+0x1430/0x19f0 fs/namespace.c:2716
sp : ffff8000a4187980
x29: ffff8000a4187a80 x28: ffff0000c94ae000 x27: dfff800000000000
x26: ffff0000fc9ee740 x25: ffff0000fc9ee700 x24: ffff0000d1551400
x23: ffff0000c94ae000 x22: ffff0000dac39dc0 x21: ffff0000fc9ee901
x20: ffff0000fc917570 x19: ffff0000fc917570 x18: 1fffe0003379be88
x17: ffff0001fea8c8b0 x16: ffff80008afd3190 x15: 0000000000000002
x14: 1fffe00019295c09 x13: 0000000000000000 x12: 0000000000000000
x11: ffff600019295c0b x10: 0000000000ff0100 x9 : 0000000000000000
x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000008 x3 : 0000000000000000
x2 : 0000000000000008 x1 : ffff0000fc9ee740 x0 : ffff0000fc917568
Call trace:
 skip_mnt_tree fs/namespace.c:-1 [inline] (P)
 commit_tree fs/namespace.c:1201 [inline] (P)
 attach_recursive_mnt+0x1414/0x19f0 fs/namespace.c:2716 (P)
 graft_tree fs/namespace.c:2862 [inline]
 do_add_mount fs/namespace.c:3709 [inline]
 do_new_mount_fc fs/namespace.c:3745 [inline]
 do_new_mount+0x650/0x7f4 fs/namespace.c:3807
 path_mount+0x5b4/0xde0 fs/namespace.c:4120
 do_mount fs/namespace.c:4133 [inline]
 __do_sys_mount fs/namespace.c:4344 [inline]
 __se_sys_mount fs/namespace.c:4321 [inline]
 __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4321
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 42 Comm: kworker/u8:3 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Workqueue: events_unbound toggle_allocation_gate
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : csd_lock_wait kernel/smp.c:342 [inline]
pc : smp_call_function_many_cond+0xee8/0x1418 kernel/smp.c:877
lr : csd_lock_wait kernel/smp.c:342 [inline]
lr : smp_call_function_many_cond+0xf00/0x1418 kernel/smp.c:877
sp : ffff800099287720
x29: ffff800099287830 x28: 0000000000000011 x27: ffff00019bd19a00
x26: 0000000000000000 x25: ffff80008f7c2040 x24: ffffffffffffffff
x23: 1fffe000337a3340 x22: dfff800000000000 x21: 1fffe000337a3341
x20: ffff00019bcfbd88 x19: ffff00019bd19a08 x18: 0000000000000000
x17: ffff80010c5fd000 x16: ffff80008b007230 x15: 0000000000000001
x14: 1fffe0003379f7b1 x13: 0000000000000000 x12: 0000000000000000
x11: ffff60003379f7b2 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : 0000000000000011 x7 : ffff80008023477c x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000000 x3 : ffff8000806888a0
x2 : 0000000000000000 x1 : 0000000000000004 x0 : 0000000000000001
Call trace:
 __cmpwait_case_32 arch/arm64/include/asm/cmpxchg.h:231 [inline] (P)
 __cmpwait arch/arm64/include/asm/cmpxchg.h:257 [inline] (P)
 csd_lock_wait kernel/smp.c:342 [inline] (P)
 smp_call_function_many_cond+0xee8/0x1418 kernel/smp.c:877 (P)
 smp_call_function_many kernel/smp.c:901 [inline]
 smp_call_function kernel/smp.c:923 [inline]
 kick_all_cpus_sync+0x40/0xa0 kernel/smp.c:1068
 arch_jump_label_transform_apply+0x14/0x20 arch/arm64/kernel/jump_label.c:34
 __jump_label_update+0x30c/0x334 kernel/jump_label.c:521
 jump_label_update+0x3f0/0x484 kernel/jump_label.c:919
 static_key_enable_cpuslocked+0x11c/0x220 kernel/jump_label.c:210
 static_key_enable+0x24/0x38 kernel/jump_label.c:223
 toggle_allocation_gate+0xbc/0x240 mm/kfence/core.c:850
 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x958/0xed8 kernel/workqueue.c:3400
 kthread+0x5fc/0x75c kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844