syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=213c/1/0x4000000000000000 softirq=166360/166361 fqs=108
rcu: 	(detected by 1, t=10505 jiffies, g=195097, q=648 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 27755 Comm: syz.2.6769 Not tainted 6.12.0-rc6-syzkaller-00225-g50643bbc9eb6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4842 [inline]
RIP: 0010:__lock_acquire+0x73a/0x2050 kernel/locking/lockdep.c:5152
Code: b6 04 10 84 c0 0f 85 74 13 00 00 41 8b 6d 00 41 89 ec ff cd 0f 88 a2 00 00 00 89 eb 83 fd 31 73 79 48 8d 04 9b 48 8d 5c c6 20 <48> 89 d8 48 c1 e8 03 0f b6 04 10 84 c0 75 18 8b 1b 41 0f b6 04 16
RSP: 0018:ffffc90000007910 EFLAGS: 00000083
RAX: 0000000000000005 RBX: ffff888025ef2928 RCX: 0000000000000002
RDX: dffffc0000000000 RSI: ffff888025ef28e0 RDI: 000000000000000a
RBP: 0000000000000001 R08: ffffffff942cd807 R09: 1ffffffff2859b00
R10: dffffc0000000000 R11: fffffbfff2859b01 R12: 0000000000000002
R13: ffff888025ef28d8 R14: 1ffff11004bde52a R15: ffff888025ef2950
FS:  00007fb3b66326c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020003c80 CR3: 0000000031386000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
 debug_object_activate+0x16d/0x510 lib/debugobjects.c:708
 debug_hrtimer_activate kernel/time/hrtimer.c:423 [inline]
 debug_activate kernel/time/hrtimer.c:478 [inline]
 enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1085
 __run_hrtimer kernel/time/hrtimer.c:1708 [inline]
 __hrtimer_run_queues+0x6cb/0xd50 kernel/time/hrtimer.c:1755
 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1817
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x112/0x420 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:wake_q_add_safe+0xa/0x110 kernel/sched/core.c:1046
Code: 03 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 41 57 41 56 41 54 <53> 49 89 f6 49 89 fc 4c 8d be 40 0a 00 00 4c 89 ff be 08 00 00 00
RSP: 0018:ffffc900046f7bc0 EFLAGS: 00000282
RAX: 1ffff92000966f62 RBX: ffffc90004b37ae0 RCX: ffffffff818781fd
RDX: 0000000000000001 RSI: ffff888025de8000 RDI: ffffc900046f7ca0
RBP: ffffc900046f7d10 R08: ffffc90000a3d703 R09: 1ffff92000147ae0
R10: dffffc0000000000 R11: fffff52000147ae1 R12: ffffc90004b37b18
R13: dffffc0000000000 R14: 00000000ffffffff R15: 0000000000000064
 futex_wake+0x424/0x5c0 kernel/futex/waitwake.c:192
 do_futex+0x392/0x560 kernel/futex/syscalls.c:107
 __do_sys_futex kernel/futex/syscalls.c:179 [inline]
 __se_sys_futex+0x3f9/0x480 kernel/futex/syscalls.c:160
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb3b577e719
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:00007fb3b66320e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fb3b5936060 RCX: 00007fb3b577e719
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fb3b5936064
RBP: 00007fb3b5936058 R08: 7fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb3b5936064
R13: 0000000000000000 R14: 00007ffd7a9ca5b0 R15: 00007ffd7a9ca698
 </TASK>
rcu: rcu_preempt kthread starved for 9965 jiffies! g195097 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:24912 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x184f/0x4c30 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6782
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2615
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 27748 Comm: syz.7.6768 Not tainted 6.12.0-rc6-syzkaller-00225-g50643bbc9eb6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x19f8/0x2ca0 kernel/smp.c:884
Code: 89 e6 83 e6 01 31 ff e8 86 f3 0b 00 41 83 e4 01 49 bc 00 00 00 00 00 fc ff df 75 07 e8 31 ef 0b 00 eb 38 f3 90 42 0f b6 04 23 <84> c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 15 ef 0b 00 eb e4 44
RSP: 0018:ffffc9000b957880 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff110170c8ca1 RCX: ffff8880276bda00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000b957a80 R08: ffffffff8188eb1a R09: 1ffffffff2859b00
R10: dffffc0000000000 R11: fffffbfff2859b01 R12: dffffc0000000000
R13: ffff8880b8646508 R14: ffff8880b873fc80 R15: 0000000000000000
FS:  000055556b284500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33a10ffc CR3: 0000000078ee0000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1051
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:2085 [inline]
 text_poke_bp_batch+0x352/0xb30 arch/x86/kernel/alternative.c:2295
 text_poke_flush arch/x86/kernel/alternative.c:2486 [inline]
 text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2493
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_disable_cpuslocked+0xd2/0x1c0 kernel/jump_label.c:240
 static_key_disable+0x1a/0x20 kernel/jump_label.c:248
 tracepoint_remove_func kernel/tracepoint.c:417 [inline]
 tracepoint_probe_unregister+0x6f2/0x990 kernel/tracepoint.c:551
 bpf_raw_tp_link_release+0x45/0x70 kernel/bpf/syscall.c:3479
 bpf_link_free+0xf7/0x250 kernel/bpf/syscall.c:3005
 bpf_link_put_direct kernel/bpf/syscall.c:3045 [inline]
 bpf_link_release+0x78/0x90 kernel/bpf/syscall.c:3052
 __fput+0x241/0x880 fs/file_table.c:431
 task_work_run+0x251/0x310 kernel/task_work.c:239
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fca0ab7e719
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:00007ffd526eddc8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fca0ad37a80 RCX: 00007fca0ab7e719
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fca0ad37a80 R08: 0000000000000006 R09: 00007ffd526ee0bf
R10: 00000000005f0de0 R11: 0000000000000246 R12: 000000000021275a
R13: 00007ffd526eded0 R14: 000000000000015e R15: ffffffffffffffff
 </TASK>