rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=18a4/1/0x4000000000000000 softirq=66029/66030 fqs=5
rcu: 	(detected by 1, t=10502 jiffies, g=91653, q=295 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3524 Comm: kworker/u4:11 Not tainted 6.6.95-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: btrfs-cache btrfs_work_helper
RIP: 0010:mark_lock+0x4b/0x320 kernel/locking/lockdep.c:-1
Code: 29 4d 8d 7e 20 4c 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 74 02 00 00 41 0f b6 47 02 24 03 3c 01 bd 09 00 00 00 83 dd 00 <41> bc 01 00 00 00 89 e9 41 d3 e4 4d 8d 7e 20 4c 89 f8 48 c1 e8 03
RSP: 0018:ffffc90000007820 EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffff88802e821e00 RCX: ffffffff8167b554
RDX: 0000000000000008 RSI: ffff88802e822958 RDI: ffff88802e821e00
RBP: 0000000000000008 R08: dffffc0000000000 R09: 1ffffffff21b4aa4
R10: dffffc0000000000 R11: fffffbfff21b4aa5 R12: 0000000000000002
R13: dffffc0000000000 R14: ffff88802e822958 R15: ffff88802e822978
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff601311f98 CR3: 000000002f724000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 mark_usage kernel/locking/lockdep.c:4599 [inline]
 __lock_acquire+0xd49/0x7c80 kernel/locking/lockdep.c:5091
 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
 debug_object_activate+0x6c/0x4b0 lib/debugobjects.c:709
 debug_hrtimer_activate kernel/time/hrtimer.c:450 [inline]
 debug_activate kernel/time/hrtimer.c:505 [inline]
 enqueue_hrtimer+0x30/0x370 kernel/time/hrtimer.c:1113
 __run_hrtimer kernel/time/hrtimer.c:1772 [inline]
 __hrtimer_run_queues+0x637/0xc40 kernel/time/hrtimer.c:1819
 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1881
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa9/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 3a f8 13 f7 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 82 62 e3 f6 65 8b 05 93 b8 8b 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc9000d147740 EFLAGS: 00000206
RAX: c0d6ae2c44b5ed00 RBX: 0000000000000a06 RCX: c0d6ae2c44b5ed00
RDX: dffffc0000000000 RSI: ffffffff8aaab2c0 RDI: 0000000000000001
RBP: ffffc9000d1477d0 R08: ffffffff90da5687 R09: 1ffffffff21b4ad0
R10: dffffc0000000000 R11: fffffbfff21b4ad1 R12: dffffc0000000000
R13: 0000000000000a06 R14: ffff888142bbb4a0 R15: 1ffff92001a28ee8
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 __wake_up_common_lock kernel/sched/wait.c:140 [inline]
 __wake_up+0x11f/0x190 kernel/sched/wait.c:160
 caching_thread+0x1534/0x1930 fs/btrfs/block-group.c:912
 btrfs_work_helper+0x36c/0xb80 fs/btrfs/async-thread.c:314
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: rcu_preempt kthread starved for 10475 jiffies! g91653 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:26568 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x14e2/0x4580 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 16547 Comm: syz.8.3803 Not tainted 6.6.95-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:csd_lock_wait kernel/smp.c:311 [inline]
RIP: 0010:smp_call_function_many_cond+0xddf/0x1130 kernel/smp.c:855
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 2a e7 0a 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 65 e3 0a 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 49 e3
RSP: 0018:ffffc9000f947540 EFLAGS: 00000246
RAX: ffffffff817ab317 RBX: 1ffff110171c87d9 RCX: 0000000000080000
RDX: ffffc9000da5b000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000f9476c0 R08: ffffffff90da5527 R09: 1ffffffff21b4aa4
R10: dffffc0000000000 R11: fffffbfff21b4aa5 R12: ffff8880b8e43ec8
R13: dffffc0000000000 R14: ffff8880b8f3d588 R15: 0000000000000000
FS:  00007ff6013126c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2c41cff8 CR3: 000000002faad000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1023
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:2222 [inline]
 text_poke_bp_batch+0x318/0x930 arch/x86/kernel/alternative.c:2432
 text_poke_bp+0xb0/0xf0 arch/x86/kernel/alternative.c:2659
 __static_call_transform+0x3a4/0x570 arch/x86/kernel/static_call.c:111
 arch_static_call_transform+0x5f/0xc0 arch/x86/kernel/static_call.c:163
 __static_call_update+0xe1/0x5c0 kernel/static_call_inline.c:147
 tracepoint_update_call kernel/tracepoint.c:317 [inline]
 tracepoint_add_func+0x6bf/0x9a0 kernel/tracepoint.c:365
 tracepoint_probe_register_prio_may_exist+0x60/0xa0 kernel/tracepoint.c:482
 bpf_raw_tp_link_attach+0x3e9/0x560 kernel/bpf/syscall.c:3738
 bpf_raw_tracepoint_open+0x197/0x210 kernel/bpf/syscall.c:3765
 __sys_bpf+0x364/0x800 kernel/bpf/syscall.c:5509
 __do_sys_bpf kernel/bpf/syscall.c:5571 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5569 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5569
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff60058e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff601312038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007ff6007b5fa0 RCX: 00007ff60058e929
RDX: 0000000000000010 RSI: 00002000000000c0 RDI: 0000000000000011
RBP: 00007ff600610b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff6007b5fa0 R15: 00007ffff61caab8
 </TASK>