rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=b1e4/1/0x4000000000000000 softirq=13446/13447 fqs=19
rcu: 	(detected by 1, t=10506 jiffies, g=10437, q=946 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5829 Comm: syz-executor Not tainted 6.14.0-syzkaller-05877-g1a9239bb4253 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:taprio_set_budgets+0x182/0x380 net/sched/sch_taprio.c:-1
Code: 1b 48 89 ef 48 89 de e8 fc fa a8 f7 48 39 dd 75 0f e8 92 f8 a8 f7 bd ff ff ff 7f e9 a1 00 00 00 e8 83 f8 a8 f7 48 8b 6c 24 18 <48> 8b 1c 24 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80
RSP: 0018:ffffc90000007c10 EFLAGS: 00000006
RAX: ffffffff8a1a7edd RBX: 0000000000000111 RCX: ffff8880298dda00
RDX: 0000000000010000 RSI: 0000000000000111 RDI: 0000000000000000
RBP: ffff88802d110c08 R08: ffffffff8a1a7ec4 R09: 1ffff11005a22190
R10: dffffc0000000000 R11: ffffed1005a22191 R12: 0000000000000004
R13: ffff88802d110c08 R14: ffff88802d110c00 R15: 0000000000000001
FS:  000055558f316500(0000) GS:ffff888124fea000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558f3315c8 CR3: 0000000063b5c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 advance_sched+0x98d/0xca0 net/sched/sch_taprio.c:977
 __run_hrtimer kernel/time/hrtimer.c:1791 [inline]
 __hrtimer_run_queues+0x5a6/0xd40 kernel/time/hrtimer.c:1855
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1917
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x420 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd9/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 2b 00 74 08 4c 89 f7 e8 cd cb 04 f6 f6 44 24 21 02 75 55 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> a2 ba 69 f5 65 8b 05 cb 7e 3c 07 85 c0 74 46 48 c7 04 24 0e 36
RSP: 0018:ffffc90003df7780 EFLAGS: 00000206
RAX: 74838b2d2d28e200 RBX: 1ffff920007beef4 RCX: 0000000000000006
RDX: 0000000000000006 RSI: ffffffff8e67a20f RDI: 0000000000000001
RBP: ffffc90003df7820 R08: ffffffff905e4477 R09: 1ffffffff20bc88e
R10: dffffc0000000000 R11: fffffbfff20bc88f R12: 1ffff920007beef0
R13: dffffc0000000000 R14: ffffc90003df77a0 R15: 0000000000000246
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 get_partial_node+0x380/0x3f0 mm/slub.c:2891
 get_partial mm/slub.c:2971 [inline]
 ___slab_alloc+0xb92/0x1500 mm/slub.c:3829
 __slab_alloc+0x58/0xa0 mm/slub.c:3939
 __slab_alloc_node mm/slub.c:4014 [inline]
 slab_alloc_node mm/slub.c:4175 [inline]
 kmem_cache_alloc_noprof+0x270/0x390 mm/slub.c:4194
 mt_alloc_one lib/maple_tree.c:176 [inline]
 mas_alloc_nodes+0x25b/0x7e0 lib/maple_tree.c:1253
 mas_erase+0x1ea/0x540 lib/maple_tree.c:6214
 mtree_erase+0x1c8/0x280 lib/maple_tree.c:6547
 simple_offset_remove+0x58/0x90 fs/libfs.c:336
 shmem_unlink+0x165/0x2b0 mm/shmem.c:3984
 vfs_unlink+0x365/0x650 fs/namei.c:4544
 do_unlinkat+0x442/0x7b0 fs/namei.c:4608
 __do_sys_unlink fs/namei.c:4654 [inline]
 __se_sys_unlink fs/namei.c:4652 [inline]
 __x64_sys_unlink+0x47/0x50 fs/namei.c:4652
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f212078c717
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:00007fff27e71e18 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f212078c717
RDX: 00007fff27e71e40 RSI: 00007fff27e71ed0 RDI: 00007fff27e71ed0
RBP: 00007fff27e71ed0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007fff27e72f60
R13: 00007f212080e08c R14: 0000000000014f12 R15: 00007fff27e72fa0
 </TASK>
rcu: rcu_preempt kthread starved for 10413 jiffies! g10437 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:26744 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5366 [inline]
 __schedule+0x1b18/0x50e0 kernel/sched/core.c:6747
 __schedule_loop kernel/sched/core.c:6824 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6839
 schedule_timeout+0x15b/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2e1/0x1340 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2248
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 5839 Comm: syz-executor Not tainted 6.14.0-syzkaller-05877-g1a9239bb4253 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x1bac/0x2d40 kernel/smp.c:885
Code: 03 84 c0 75 7e 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 b8 02 0c 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 68 fe 0b 00 eb 41 f3 90 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 11 41 f7 45 00
RSP: 0018:ffffc90003fd74c0 EFLAGS: 00000293
RAX: ffffffff81b7791d RBX: 1ffff110170c820d RCX: ffff888068c75a00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003fd76c0 R08: ffffffff81b778e8 R09: 1ffffffff20bc88e
R10: dffffc0000000000 R11: fffffbfff20bc88f R12: ffff8880b873ad08
R13: ffff8880b8641068 R14: ffff8880b873ad00 R15: 0000000000000000
FS:  000055557d414500(0000) GS:ffff8881250ea000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4c494d56c0 CR3: 0000000063ba0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1275 [inline]
 flush_tlb_mm_range+0xb8d/0x13f0 arch/x86/mm/tlb.c:1365
 dup_mmap kernel/fork.c:787 [inline]
 dup_mm kernel/fork.c:1700 [inline]
 copy_mm+0x18c5/0x2170 kernel/fork.c:1752
 copy_process+0x17de/0x3d10 kernel/fork.c:2395
 kernel_clone+0x242/0x930 kernel/fork.c:2810
 __do_sys_clone kernel/fork.c:2953 [inline]
 __se_sys_clone kernel/fork.c:2937 [inline]
 __x64_sys_clone+0x268/0x2e0 kernel/fork.c:2937
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4c487839d3
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffd932029a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4c487839d3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 000055557d4147d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 0000000000015220 R15: 00007ffd93202b40
 </TASK>