rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=7654/1/0x4000000000000000 softirq=47159/47163 fqs=1
rcu: 	(detected by 0, t=10505 jiffies, g=47501, q=275 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11266 Comm: syz.1.1832 Not tainted 6.14.0-next-20250402-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__raw_callee_save___pv_queued_spin_unlock+0x10/0x18
Code: 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 52 b8 01 00 00 00 31 d2 f0 0f b0 17 <75> 06 5a c3 cc cc cc cc 56 0f b6 f0 e8 9f ff ff ff 5e 5a c3 cc cc
RSP: 0018:ffffc90000a08bf0 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 1ffff1100c14a85e RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888060a542e8
RBP: dffffc0000000000 R08: ffff888060a542eb R09: 1ffff1100c14a85d
R10: dffffc0000000000 R11: ffffed100c14a85e R12: 1ffff1100c14a85f
R13: ffff888060a542f8 R14: ffff888060a542f0 R15: ffff888060a542e8
FS:  00007fcb6b3a56c0(0000) GS:ffff888125093000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001700 CR3: 000000005f11a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:577 [inline]
 queued_spin_unlock arch/x86/include/asm/qspinlock.h:57 [inline]
 do_raw_spin_unlock+0x13c/0x8b0 kernel/locking/spinlock_debug.c:142
 __raw_spin_unlock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_unlock+0x1e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 advance_sched+0x9b4/0xca0 net/sched/sch_taprio.c:981
 __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_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ca de 6b f5 48 89 df e8 02 88 6c f5 e8 5d 21 98 f5 fb bf 01 00 00 00 <e8> 72 6a 5d f5 65 8b 05 1b ab 35 07 85 c0 74 06 5b c3 cc cc cc cc
RSP: 0018:ffffc9000af76430 EFLAGS: 00000282
RAX: 9ed8159f25514100 RBX: ffff88807b727210 RCX: 0000000000000007
RDX: 0000000000000007 RSI: ffffffff8e6a38db RDI: 0000000000000001
RBP: ffffc9000af765f0 R08: ffffffff905ff137 R09: 1ffffffff20bfe26
R10: dffffc0000000000 R11: fffffbfff20bfe27 R12: ffffea0001328780
R13: ffffc9000af76540 R14: ffffc9000af76540 R15: dffffc0000000000
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 __filemap_add_folio+0x1078/0x16c0 mm/filemap.c:939
 filemap_add_folio+0x157/0x380 mm/filemap.c:969
 page_cache_ra_unbounded+0x40c/0x820 mm/readahead.c:275
 do_async_mmap_readahead mm/filemap.c:3289 [inline]
 filemap_fault+0x6ce/0x13d0 mm/filemap.c:3388
 __do_fault+0x135/0x390 mm/memory.c:5098
 do_read_fault mm/memory.c:5518 [inline]
 do_fault mm/memory.c:5652 [inline]
 do_pte_missing mm/memory.c:4160 [inline]
 handle_pte_fault+0x3f0c/0x61c0 mm/memory.c:5997
 __handle_mm_fault mm/memory.c:6140 [inline]
 handle_mm_fault+0x1129/0x1bf0 mm/memory.c:6309
 faultin_page mm/gup.c:1188 [inline]
 __get_user_pages+0x1b4a/0x42f0 mm/gup.c:1491
 __get_user_pages_locked mm/gup.c:1757 [inline]
 get_dump_page+0x1e1/0x460 mm/gup.c:2275
 dump_user_range+0x22c/0xef0 fs/coredump.c:953
 elf_core_dump+0x4098/0x4af0 fs/binfmt_elf.c:2128
 do_coredump+0x22c3/0x3260 fs/coredump.c:759
 get_signal+0x13ed/0x1730 kernel/signal.c:3021
 arch_do_signal_or_restart+0x98/0x840 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]
 irqentry_exit_to_user_mode+0x7e/0x250 kernel/entry/common.c:231
 exc_page_fault+0x5c2/0x8e0 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7fcb6a58d171
Code: 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 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:0000000000000030 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fcb6a7a5fa0 RCX: 00007fcb6a58d169
RDX: 0000000000000000 RSI: 0000000000000030 RDI: 0000000000000600
RBP: 00007fcb6a60e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fcb6a7a5fa0 R15: 00007ffede2c9168
 </TASK>
rcu: rcu_preempt kthread starved for 10500 jiffies! g47501 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:26688 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b88/0x5240 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6860
 schedule_timeout+0x15b/0x2b0 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+0x7b7/0x940 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: 0 UID: 0 PID: 11384 Comm: syz.5.1873 Not tainted 6.14.0-next-20250402-syzkaller #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 48 e8 0b 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 f8 e3 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:ffffc9000b29f600 EFLAGS: 00000293
RAX: ffffffff81b7732d RBX: 1ffff110170e7e91 RCX: ffff88802e758000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000b29f800 R08: ffffffff81b772f8 R09: 1ffffffff20bfe26
R10: dffffc0000000000 R11: fffffbfff20bfe27 R12: ffff8880b863ad08
R13: ffff8880b873f488 R14: ffff8880b863ad00 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888124f93000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb86a248000 CR3: 0000000026232000 CR4: 00000000003526f0
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: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
 tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
 tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:480 [inline]
 tlb_flush_mmu+0x1aa/0x690 mm/mmu_gather.c:403
 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:496
 exit_mmap+0x5b1/0xde0 mm/mmap.c:1297
 __mmput+0x115/0x420 kernel/fork.c:1379
 exit_mm+0x221/0x310 kernel/exit.c:586
 do_exit+0x994/0x28c0 kernel/exit.c:941
 do_group_exit+0x207/0x2c0 kernel/exit.c:1103
 __do_sys_exit_group kernel/exit.c:1114 [inline]
 __se_sys_exit_group kernel/exit.c:1112 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1112
 x64_sys_call+0x26c3/0x26d0 arch/x86/include/generated/asm/syscalls_64.h:232
 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: 0033:0x7fdee8d8d169
Code: Unable to access opcode bytes at 0x7fdee8d8d13f.
RSP: 002b:00007fff6a961478 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdee8d8d169
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff6a9614dc R08: 000000046a96156f R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000025
R13: 00000000000927c0 R14: 000000000004e1d0 R15: 00007fff6a961530
 </TASK>