rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=43997, q=66 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294993705-4294983203), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g43997 f0x2 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:28064 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x1139/0x6150 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6960
 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 12054 Comm: syz.0.1702 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__raw_spin_unlock include/linux/spinlock_api_smp.h:142 [inline]
RIP: 0010:_raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:186
Code: 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 ba ac 1f f6 <48> 89 df e8 72 ff 1f f6 bf 01 00 00 00 e8 88 02 10 f6 65 8b 05 41
RSP: 0018:ffffc90000007d80 EFLAGS: 00000096
RAX: 0000000000000000 RBX: ffff888020be82a8 RCX: ffffc90000007d44
RDX: 0000000000000005 RSI: ffffffff8daa563c RDI: ffffffff8bf2a580
RBP: ffff888057cc3400 R08: 0000000000000004 R09: 0000000000000002
R10: 0000000000000002 R11: ffff88802c2fd4b0 R12: 1884ca899e4da137
R13: 1884ca899e4da137 R14: 0000000000000002 R15: ffff888057cc3c10
FS:  00007f57512cd6c0(0000) GS:ffff8881248fd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f923ffc CR3: 0000000056caf000 CR4: 00000000003526f0
DR0: 000000000000200c DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 spin_unlock include/linux/spinlock.h:391 [inline]
 advance_sched+0x62b/0xc80 net/sched/sch_taprio.c:987
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x202/0xc40 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x3c0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:xa_entry include/linux/xarray.h:1226 [inline]
RIP: 0010:xas_next_entry+0x1dd/0x3c0 include/linux/xarray.h:1731
Code: 87 9f 01 00 00 4b 8d 7c e6 28 48 89 f8 48 c1 e8 03 42 80 3c 38 00 0f 85 7e 01 00 00 49 83 c4 04 4f 8b 64 e6 08 e8 63 f7 7f 09 <31> ff 89 c5 89 c6 e8 58 6e c7 ff 85 ed 0f 85 95 00 00 00 e8 ab 73
RSP: 0018:ffffc9001d63f618 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffc9001d63f7c8 RCX: ffffc9000c169000
RDX: 0000000000080000 RSI: ffffffff81f76fb0 RDI: ffff888023d8a478
RBP: 0000000000000711 R08: 0000000000000001 R09: 000000000000003f
R10: 0000000000000011 R11: ffff88802c2fd4b0 R12: ffffea000138c040
R13: 000000000000071f R14: ffff888023d8a3c0 R15: dffffc0000000000
 next_uptodate_folio+0x29/0x4a0 mm/filemap.c:3699
 filemap_map_pages+0x6e8/0x1e00 mm/filemap.c:3929
 do_fault_around mm/memory.c:5713 [inline]
 do_read_fault mm/memory.c:5746 [inline]
 do_fault+0x9cd/0x1ad0 mm/memory.c:5889
 do_pte_missing mm/memory.c:4401 [inline]
 handle_pte_fault mm/memory.c:6273 [inline]
 __handle_mm_fault+0x1919/0x2bb0 mm/memory.c:6411
 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6580
 faultin_page mm/gup.c:1126 [inline]
 __get_user_pages+0x54e/0x3590 mm/gup.c:1428
 populate_vma_page_range+0x267/0x3f0 mm/gup.c:1860
 __mm_populate+0x1d8/0x380 mm/gup.c:1963
 mm_populate include/linux/mm.h:3701 [inline]
 vm_mmap_pgoff+0x37f/0x470 mm/util.c:586
 ksys_mmap_pgoff+0x7d/0x5c0 mm/mmap.c:604
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f575038f749
Code: ff ff c3 66 2e 0f 1f 84 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
RSP: 002b:00007f57512cd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f57505e5fa0 RCX: 00007f575038f749
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f5750413f91 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f57505e6038 R14: 00007f57505e5fa0 R15: 00007ffc84cde868
 </TASK>