rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=8204/1/0x4000000000000000 softirq=99254/99254 fqs=5
rcu: 	(detected by 1, t=10505 jiffies, g=123001, q=671 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 19828 Comm: syz.5.4091 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:__hrtimer_run_queues+0x1cc/0xa10 kernel/time/hrtimer.c:2121
Code: d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 6a 9b 83 00 48 8b 1b 4c 8b 7c 24 30 4c 89 ff 48 89 de e8 17 9e 13 00 49 39 df <0f> 8c 92 07 00 00 48 8b 44 24 70 42 0f b6 04 28 84 c0 0f 85 dd 03
RSP: 0018:ffffc90000007dc0 EFLAGS: 00000006
RAX: ffffffff81b42f49 RBX: 1bc18b0a5e67b6c0 RCX: ffff88807d2f5dc0
RDX: 8000000001000001 RSI: 1bc18b0a5e67b6c0 RDI: 1bc34aa810a04302
RBP: ffff888079247300 R08: 0000000001000001 R09: ffff888079247308
R10: dffffc0000000000 R11: ffffed100f248e63 R12: ffff8880b8628280
R13: dffffc0000000000 R14: ffff8880b8628420 R15: 1bc34aa810a04302
FS:  00007f14343936c0(0000) GS:ffff888124cd2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055930ec1a900 CR3: 00000000a4dd9000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 hrtimer_interrupt+0x4cd/0xaa0 kernel/time/hrtimer.c:2243
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:srso_alias_return_thunk+0x0/0xfbef5 arch/x86/lib/retpoline.S:234
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 48 8d 64 24 08 c3 cc <e8> f4 ff ff ff 0f 0b cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc
RSP: 0018:ffffc9000384e368 EFLAGS: 00000293
RAX: ffffffff848cdde1 RBX: 0000000000000001 RCX: ffff88807d2f5dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88803307d940
RBP: 0000000000000001 R08: ffffffff907a2b7f R09: 1ffffffff20f456f
R10: dffffc0000000000 R11: fffffbfff20f4570 R12: dffffc0000000000
R13: ffff88807d2f6380 R14: ffff88803307d940 R15: ffff8880351bcfb0
 security_vm_enough_memory_mm+0x21/0x4f0 security/security.c:736
 shmem_acct_blocks mm/shmem.c:212 [inline]
 shmem_inode_acct_blocks+0xd5/0x460 mm/shmem.c:228
 shmem_alloc_and_add_folio+0x8cf/0xf60 mm/shmem.c:2005
 shmem_get_folio_gfp+0x5da/0x16d0 mm/shmem.c:2528
 shmem_fault+0x179/0x390 mm/shmem.c:2729
 __do_fault+0x138/0x2a0 mm/memory.c:5565
 do_read_fault mm/memory.c:6000 [inline]
 do_fault mm/memory.c:6134 [inline]
 do_pte_missing+0x2215/0x34b0 mm/memory.c:4700
 handle_pte_fault mm/memory.c:6558 [inline]
 __handle_mm_fault mm/memory.c:6707 [inline]
 handle_mm_fault+0x1a53/0x3750 mm/memory.c:6876
 faultin_page mm/gup.c:1126 [inline]
 __get_user_pages+0x1675/0x2750 mm/gup.c:1428
 __get_user_pages_locked mm/gup.c:1692 [inline]
 get_dump_page+0x1b5/0x410 mm/gup.c:2192
 dump_user_range+0x20a/0x12c0 fs/coredump.c:1361
 elf_core_dump+0x3485/0x3a90 fs/binfmt_elf.c:2106
 coredump_write+0x1290/0x1960 fs/coredump.c:1047
 do_coredump fs/coredump.c:1126 [inline]
 vfs_coredump+0x3764/0x4520 fs/coredump.c:1195
 get_signal+0x1094/0x12c0 kernel/signal.c:3036
 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:101 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline]
 irqentry_exit+0x2ba/0x910 kernel/entry/common.c:165
 exc_general_protection+0x16b/0x1f0 arch/x86/kernel/traps.c:914
 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:589
RIP: 0033:0x7f143359e161
Code: 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:00002000000001a0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f1433826090 RCX: 00007f143359e159
RDX: 0000200000000280 RSI: 00002000000001a0 RDI: 0000000000000000
RBP: 00007f143363503b R08: 0000200000000340 R09: 0000200000000340
R10: 00002000000002c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1433826128 R14: 00007f1433826090 R15: 00007fff925a1078
 </TASK>
rcu: rcu_preempt kthread starved for 10480 jiffies! g123001 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27496 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5526 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7276
 __schedule_loop kernel/sched/core.c:7353 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7368
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 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: 20064 Comm: syz.3.4152 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:csd_lock_wait kernel/smp.c:363 [inline]
RIP: 0010:csd_lock kernel/smp.c:396 [inline]
RIP: 0010:smp_call_function_many_cond+0x61e/0x1500 kernel/smp.c:944
Code: b6 04 04 84 c0 0f 85 d5 03 00 00 44 8b 3b 44 89 fe 83 e6 01 31 ff e8 51 54 0c 00 41 83 e7 01 75 07 e8 46 4f 0c 00 eb 3f f3 90 <48> b8 00 00 00 00 00 fc ff df 41 0f b6 04 04 84 c0 75 0f f7 03 01
RSP: 0018:ffffc90006557060 EFLAGS: 00000293
RAX: ffffffff81bb7b6e RBX: ffff8880b8643708 RCX: ffff888032143e80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900065571b0 R08: ffff88803214541f R09: 1ffff11006428a83
R10: dffffc0000000000 R11: ffffffff8179dc60 R12: 1ffff110170c86e1
R13: 0000000000000000 R14: ffff8880b8643700 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888124dd2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5f35000fe0 CR3: 00000000779b1000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
 flush_tlb_mm_range+0x8ff/0x1090 arch/x86/mm/tlb.c:1435
 tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
 tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:509 [inline]
 zap_pte_range mm/memory.c:2092 [inline]
 zap_pmd_range mm/memory.c:2151 [inline]
 zap_pud_range mm/memory.c:2179 [inline]
 zap_p4d_range mm/memory.c:2200 [inline]
 __zap_vma_range+0x3f52/0x4f80 mm/memory.c:2240
 unmap_vmas+0x390/0x550 mm/memory.c:2309
 exit_mmap+0x293/0x9f0 mm/mmap.c:1315
 __mmput+0x118/0x420 kernel/fork.c:1193
 exit_mm+0x221/0x2d0 kernel/exit.c:617
 do_exit+0x6cd/0x2360 kernel/exit.c:999
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1154
 get_signal+0x121b/0x12c0 kernel/signal.c:3051
 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f659d19e159
Code: Unable to access opcode bytes at 0x7f659d19e12f.
RSP: 002b:00007f659df920e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f659d426278 RCX: 00007f659d19e159
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f659d426278
RBP: 00007f659d426270 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f659d426308 R14: 00007ffceb4aafe0 R15: 00007ffceb4ab0c8
 </TASK>