rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=6bdc/1/0x4000000000000000 softirq=30670/30670 fqs=0
rcu: 	(detected by 0, t=10506 jiffies, g=29229, q=2863 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5842 Comm: syz-executor Not tainted 6.12.0-syzkaller-10296-gaaf20f870da0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__lock_acquire+0x1a0/0x3c40 kernel/locking/lockdep.c:5127
Code: 0a 00 00 48 c7 c6 a0 18 88 9a 48 c1 ee 03 89 44 24 08 48 b8 00 00 00 00 00 fc ff df 0f b6 34 06 48 c7 c0 a0 18 88 9a 83 e0 07 <83> c0 03 40 38 f0 7c 09 40 84 f6 0f 85 52 2c 00 00 83 7c 24 08 2f
RSP: 0018:ffffc90000a18b48 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000002
RDX: ffffffff96e88aa8 RSI: 0000000000000004 RDI: ffffffff8e1bba88
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9060bed7 R11: 0000000000000004 R12: ffffffff8e1bba80
R13: ffff8880327c8000 R14: 0000000000000000 R15: 0000000000000000
FS:  00005555850b0500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcf90460500 CR3: 000000005f482000 CR4: 00000000003526f0
DR0: 0040000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
 rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 rcu_read_lock include/linux/rcupdate.h:849 [inline]
 advance_sched+0x67f/0xc60 net/sched/sch_taprio.c:985
 __run_hrtimer kernel/time/hrtimer.c:1739 [inline]
 __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1803
 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1865
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x400 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 66 4d 39 f6 48 89 df e8 ce cc 39 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 55 c2 2a f6 65 8b 05 86 bd d1 74 85 c0 74 16 5b
RSP: 0018:ffffc90003697778 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffffffff9aa06178 RCX: 1ffffffff2dd3d6c
RDX: 0000000000000000 RSI: ffffffff8b6cdee0 RDI: ffffffff8bd1e240
RBP: 0000000000000286 R08: 0000000000000001 R09: fffffbfff2dd0d9f
R10: ffffffff96e86cff R11: 0000000000000004 R12: ffffffff9aa06170
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888030811a00
 __debug_check_no_obj_freed lib/debugobjects.c:1108 [inline]
 debug_check_no_obj_freed+0x327/0x600 lib/debugobjects.c:1129
 slab_free_hook mm/slub.c:2269 [inline]
 slab_free mm/slub.c:4598 [inline]
 kmem_cache_free+0x2d4/0x4c0 mm/slub.c:4700
 mt_free_rcu lib/maple_tree.c:198 [inline]
 mt_destroy_walk+0xbb0/0xfe0 lib/maple_tree.c:5377
 mte_destroy_walk lib/maple_tree.c:5398 [inline]
 mte_destroy_walk lib/maple_tree.c:5389 [inline]
 mas_new_root+0x556/0x660 lib/maple_tree.c:3708
 mas_wr_store_entry+0xa5f/0x24b0 lib/maple_tree.c:4081
 mas_erase+0xed0/0x12a0 lib/maple_tree.c:6264
 mtree_erase+0xc8/0x110 lib/maple_tree.c:6587
 simple_offset_remove+0x4f/0x90 fs/libfs.c:328
 shmem_unlink+0xdf/0x350 mm/shmem.c:3800
 vfs_unlink+0x2fb/0x9b0 fs/namei.c:4523
 do_unlinkat+0x570/0x760 fs/namei.c:4587
 __do_sys_unlink fs/namei.c:4635 [inline]
 __se_sys_unlink fs/namei.c:4633 [inline]
 __x64_sys_unlink+0xc5/0x110 fs/namei.c:4633
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4c0177fdb7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 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:00007ffed49fc288 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4c0177fdb7
RDX: 00007ffed49fc2b0 RSI: 00007ffed49fc340 RDI: 00007ffed49fc340
RBP: 00007ffed49fc340 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffed49fd3c0
R13: 00007f4c017f37dc R14: 000000000004b912 R15: 00007ffed49fd400
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g29229 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=18719
rcu: rcu_preempt kthread starved for 10506 jiffies! g29229 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:27488 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6848
 schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2045
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2247
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>