rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (3 ticks this GP) idle=f0b4/1/0x4000000000000000 softirq=89806/89856 fqs=1
rcu: 	(detected by 0, t=10502 jiffies, g=84521, q=678 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 16213 Comm: syz-executor Not tainted 6.15.0-rc4-syzkaller-00189-g2bfcee565c3a #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:match_held_lock+0x0/0xc0 kernel/locking/lockdep.c:5303
Code: e8 e1 a1 8d e8 41 2a 0e f6 90 0f 0b 90 90 e9 58 ff ff ff 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <53> 48 89 fb 48 39 77 10 74 55 66 83 7f 22 1f 76 65 48 8b 46 08 48
RSP: 0018:ffffc90000a08d48 EFLAGS: 00000006
RAX: 0000000000000000 RBX: ffff88802dbb8af0 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffff88805c72f300 RDI: ffff88802dbb8af0
RBP: ffff88805c72f300 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88802dbb8000
R13: ffff88802dbb8af0 R14: 00000000ffffffff R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888124ae1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555ee40808 CR3: 000000004a158000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __lock_is_held kernel/locking/lockdep.c:5599 [inline]
 lock_is_held_type+0xb0/0x150 kernel/locking/lockdep.c:5938
 lock_is_held include/linux/lockdep.h:249 [inline]
 advance_sched+0x83b/0xc80 net/sched/sch_taprio.c:925
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x1ff/0xad0 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x3f0 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x9f/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:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:124 [inline]
RIP: 0010:lock_release+0x68/0x2f0 kernel/locking/lockdep.c:5879
Code: 0f a3 05 fb f3 ec 0e 0f 82 b1 01 00 00 8b 3d 93 23 ed 0e 85 ff 0f 84 25 01 00 00 65 8b 05 58 22 0c 12 85 c0 0f 85 16 01 00 00 <65> 4c 8b 35 d8 e4 0b 12 41 8b b6 ec 0a 00 00 85 f6 0f 85 ff 00 00
RSP: 0018:ffffc90003f4f380 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff8e3bf5c0 RCX: ffffc90003f50001
RDX: 0000000000000000 RSI: ffffffff8bf48120 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 00000000000079f1 R12: ffffffff8169cd14
R13: ffffc90003f4f438 R14: ffffc90003f4fbd8 R15: ffffc90003f4f46c
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:871 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
 unwind_next_frame+0x3f9/0x20a0 arch/x86/kernel/unwind_orc.c:479
 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_record_aux_stack+0xb8/0xd0 mm/kasan/generic.c:548
 slab_free_hook mm/slub.c:2341 [inline]
 slab_free mm/slub.c:4642 [inline]
 kmem_cache_free+0x160/0x4d0 mm/slub.c:4744
 anon_vma_free mm/rmap.c:137 [inline]
 __put_anon_vma+0x114/0x3a0 mm/rmap.c:2756
 put_anon_vma include/linux/rmap.h:117 [inline]
 unlink_anon_vmas+0x58a/0x820 mm/rmap.c:444
 free_pgtables+0x2d4/0x810 mm/memory.c:391
 exit_mmap+0x3fb/0xb90 mm/mmap.c:1295
 __mmput+0x12a/0x410 kernel/fork.c:1379
 mmput+0x62/0x70 kernel/fork.c:1401
 exit_mm kernel/exit.c:589 [inline]
 do_exit+0x9d1/0x2c30 kernel/exit.c:940
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
 get_signal+0x2673/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x260 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f007d18d37c
Code: Unable to access opcode bytes at 0x7f007d18d352.
RSP: 002b:00007fffeddc5250 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: fffffffffffffe00 RBX: 0000000000000003 RCX: 00007f007d18d37c
RDX: 0000000000000030 RSI: 00007fffeddc5310 RDI: 00000000000000f9
RBP: 00007fffeddc52bc R08: 0000000000000000 R09: 0079746972756365
R10: 00007f007d3807e0 R11: 0000000000000246 R12: 000000000000008c
R13: 000000000000005f R14: 00000000000fd319 R15: 00007fffeddc5310
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10495 jiffies! g84521 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=73301
rcu: rcu_preempt kthread starved for 10496 jiffies! g84521 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28152 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x116f/0x5de0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6860
 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2248
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>