------------[ cut here ]------------
failed to allocate ring buffer on CPU 1
WARNING: kernel/trace/ring_buffer.c:7977 at trace_rb_cpu_prepare+0x330/0x3cc kernel/trace/ring_buffer.c:7976, CPU#0: syz.5.743/8712
Modules linked in:
CPU: 0 UID: 0 PID: 8712 Comm: syz.5.743 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : trace_rb_cpu_prepare+0x330/0x3cc kernel/trace/ring_buffer.c:7976
lr : trace_rb_cpu_prepare+0x330/0x3cc kernel/trace/ring_buffer.c:7976
sp : ffff800093bb7630
x29: ffff800093bb7640 x28: 1fffe00019fe0115 x27: 0000000000000001
x26: 0000000000000000 x25: dfff800000000000 x24: 0000000000000000
x23: ffff0000d8b25a88 x22: 1fffe00019fe0102 x21: ffff0000d8b25a88
x20: ffff0000cff00810 x19: 0000000000000001 x18: 1fffe00034bb7428
x17: ffff80008a7c2000 x16: 0000000000000009 x15: ffff800080c9db3c
x14: 0000000000000000 x13: 0000000000000001 x12: ffff0000d0373a80
x11: 0000000000000000 x10: 0000000000000002 x9 : 4eb78bf27b93f900
x8 : 4eb78bf27b93f900 x7 : ffff80008048e8f8 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f8870
x2 : 0000000100000000 x1 : ffff0000d0373a80 x0 : 0000000000000000
Call trace:
 trace_rb_cpu_prepare+0x330/0x3cc kernel/trace/ring_buffer.c:7976 (P)
 cpuhp_invoke_callback+0x2ac/0x6cc kernel/cpu.c:216
 __cpuhp_invoke_callback_range+0x13c/0x238 kernel/cpu.c:972
 cpuhp_invoke_callback_range kernel/cpu.c:996 [inline]
 cpuhp_up_callbacks kernel/cpu.c:1027 [inline]
 _cpu_up+0x348/0x5ec kernel/cpu.c:1674
 cpu_up+0x278/0x30c kernel/cpu.c:1706
 cpu_device_up+0x4c/0x70 kernel/cpu.c:1724
 cpu_subsys_online+0xd0/0x2c4 drivers/base/cpu.c:61
 device_online+0x100/0x18c drivers/base/core.c:4308
 online_store+0xe8/0x16c drivers/base/core.c:2879
 dev_attr_store+0x6c/0x90 drivers/base/core.c:2505
 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:738
 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:757
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590
irq event stamp: 1502
hardirqs last  enabled at (1501): [<ffff800080491ebc>] vprintk_store+0x924/0xb94 kernel/printk/printk.c:2385
hardirqs last disabled at (1502): [<ffff8000868f0d88>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:425
softirqs last  enabled at (1386): [<ffff80008013c050>] local_bh_enable include/linux/bottom_half.h:33 [inline]
softirqs last  enabled at (1386): [<ffff80008013c050>] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline]
softirqs last  enabled at (1386): [<ffff80008013c050>] fpsimd_restore_current_state+0x39c/0x9c8 arch/arm64/kernel/fpsimd.c:1797
softirqs last disabled at (1384): [<ffff80008013bcf8>] local_bh_disable include/linux/bottom_half.h:20 [inline]
softirqs last disabled at (1384): [<ffff80008013bcf8>] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline]
softirqs last disabled at (1384): [<ffff80008013bcf8>] fpsimd_restore_current_state+0x44/0x9c8 arch/arm64/kernel/fpsimd.c:1790
---[ end trace 0000000000000000 ]---