rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: (detected by 0, t=10502 jiffies, g=158077, q=193 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295118156-4295107654), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g158077 f0x2 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:25568 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5360 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7046 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7061
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x47c/0x820 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8188 Comm: syz.5.4801 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:trace_lock_release include/trace/events/lock.h:69 [inline]
RIP: 0010:lock_release+0x46/0x3e0 kernel/locking/lockdep.c:5879
Code: c0 f6 23 11 48 89 44 24 28 0f 1f 44 00 00 65 8b 05 c3 f6 23 11 83 f8 08 0f 83 9a 02 00 00 89 c0 48 0f a3 05 ac 74 25 0e 73 16 <e8> 35 e9 08 00 84 c0 75 0d f6 05 3c 5a 0f 0e 01 0f 84 ad 02 00 00
RSP: 0018:ffffc90000a08bf8 EFLAGS: 00000097
RAX: 0000000000000001 RBX: ffff88802ea9e2e8 RCX: 1ffff11005d53c65
RDX: 0000000000010000 RSI: ffffffff899f5f1f RDI: ffff88802ea9e300
RBP: ffff888030dcc550 R08: ffff888030dcc487 R09: 1ffff110061b9890
R10: dffffc0000000000 R11: ffffed10061b9891 R12: ffff88802ea9e340
R13: ffffffff899f5f1f R14: ffff88802ea9e300 R15: ffff888030dcc800
FS: 00007fb7cb9526c0(0000) GS:ffff888125af9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fc15ff8 CR3: 000000009e556000 CR4: 00000000003526f0
Call Trace:
<IRQ>
__raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
_raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
advance_sched+0x99f/0xc90 net/sched/sch_taprio.c:986
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x529/0xc60 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
__sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1058
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:raw_spin_rq_unlock_irq+0x13/0x90 kernel/sched/sched.h:1534
Code: cc e8 c1 93 eb 09 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 53 eb 16 e8 84 29 ee 09 e8 4f 34 35 00 fb 5b <41> 5e 41 5f e9 94 77 ee 09 cc f3 0f 1e fa 49 be 00 00 00 00 00 fc
RSP: 0018:ffffc9000da86be8 EFLAGS: 00000282
RAX: 932553b24a7f1200 RBX: ffff8880b8739f80 RCX: 932553b24a7f1200
RDX: 0000000000000006 RSI: ffffffff8dbbd436 RDI: ffffffff8c037200
RBP: ffffc9000da86e10 R08: ffffffff8fc3ee37 R09: 1ffffffff1f87dc6
R10: dffffc0000000000 R11: fffffbfff1f87dc7 R12: dffffc0000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880b873add8
__schedule+0x19e0/0x4cc0 kernel/sched/core.c:6972
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7291
irqentry_exit+0x6f/0x90 kernel/entry/common.c:197
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:pud_pgtable arch/x86/include/asm/pgtable.h:1056 [inline]
RIP: 0010:pmd_offset include/linux/pgtable.h:146 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1920 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1975 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1996 [inline]
RIP: 0010:unmap_page_range+0x805/0x4370 mm/memory.c:2017
Code: 85 db 4c 0f 44 f8 48 8b 84 24 60 01 00 00 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 0c 48 c7 c7 08 e5 dd 8d e8 5b 5e 1a 00 <4d> 21 f7 4c 03 3d 99 77 d3 0b 48 8b 5c 24 70 89 d8 c1 e8 12 25 f8
RSP: 0018:ffffc9000da86f80 EFLAGS: 00000246
RAX: 1ffffffff1bbbca1 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000da87230 R08: ffffc9000da87310 R09: ffffffff820aaa24
R10: 0000000000000000 R11: 0000000300000001 R12: 1ffff11013faa800
R13: 000020000054f000 R14: 000000009fd53067 R15: 000ffffffffff000
unmap_single_vma mm/memory.c:2060 [inline]
unmap_vmas+0x399/0x580 mm/memory.c:2104
vms_clear_ptes+0x35c/0x540 mm/vma.c:1228
vms_complete_munmap_vmas+0x206/0x8a0 mm/vma.c:1277
do_vmi_align_munmap+0x364/0x440 mm/vma.c:1536
do_vmi_munmap+0x253/0x2e0 mm/vma.c:1584
unmap_source_vma mm/mremap.c:1122 [inline]
move_vma+0x10eb/0x1820 mm/mremap.c:1315
mremap_to+0x6ce/0x790 mm/mremap.c:1415
do_mremap mm/mremap.c:1940 [inline]
__do_sys_mremap mm/mremap.c:1996 [inline]
__se_sys_mremap+0xd45/0xfb0 mm/mremap.c:1964
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb7cab8ebe9
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:00007fb7cb952038 EFLAGS: 00000246 ORIG_RAX: 0000000000000019
RAX: ffffffffffffffda RBX: 00007fb7cadc6270 RCX: 00007fb7cab8ebe9
RDX: 0000000000003000 RSI: 0000000000001000 RDI: 000020000054e000
RBP: 00007fb7cac11e19 R08: 000020000022c000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb7cadc6308 R14: 00007fb7cadc6270 R15: 00007ffc3ecb5238
</TASK>