rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=2d1c/1/0x4000000000000000 softirq=23442/23442 fqs=1
rcu: 	(detected by 1, t=10506 jiffies, g=19265, q=419 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8096 Comm: syz.0.482 Not tainted 6.14.0-rc7-syzkaller-00182-gc7d82913d5f9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:debug_spin_lock_after kernel/locking/spinlock_debug.c:95 [inline]
RIP: 0010:do_raw_spin_lock+0x195/0x370 kernel/locking/spinlock_debug.c:118
Code: 0f b1 0c 24 0f 85 df 00 00 00 65 8b 1d c0 96 65 7e 41 0f b6 04 17 84 c0 0f 85 90 01 00 00 48 8b 44 24 18 89 18 48 8b 44 24 20 <80> 3c 10 00 48 8b 5c 24 30 74 12 48 89 df e8 08 e1 8a 00 48 ba 00
RSP: 0000:ffffc90000007b80 EFLAGS: 00000046
RAX: 1ffff11003cdfc5f RBX: 0000000000000000 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc90000007be0
RBP: ffffc90000007c60 R08: 0000000000000003 R09: fffff52000000f7c
R10: dffffc0000000000 R11: fffff52000000f7c R12: ffff88801e6fe2e8
R13: 1ffff92000000f7c R14: ffffc90000007be0 R15: 1ffff11003cdfc5e
FS:  000055557dcda500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30220000 CR3: 000000005bac2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 spin_lock include/linux/spinlock.h:351 [inline]
 advance_sched+0xab/0xca0 net/sched/sch_taprio.c:924
 __run_hrtimer kernel/time/hrtimer.c:1801 [inline]
 __hrtimer_run_queues+0x59b/0xd30 kernel/time/hrtimer.c:1865
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1927
 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:finish_task_switch+0x1ea/0x870 kernel/sched/core.c:5252
Code: c9 50 e8 59 2e 0c 00 48 83 c4 08 4c 89 f7 e8 fd 39 00 00 0f 1f 44 00 00 4c 89 f7 e8 c0 10 7b 0a e8 0b 09 39 00 fb 48 8b 5d c0 <48> 8d bb 08 16 00 00 48 89 f8 48 c1 e8 03 49 be 00 00 00 00 00 fc
RSP: 0000:ffffc900037d7988 EFLAGS: 00000282
RAX: 223a3a54968b1f00 RBX: ffff888027540000 RCX: ffffffff9a653903
RDX: dffffc0000000000 RSI: ffffffff8c2ab3a0 RDI: ffffffff8c8100a0
RBP: ffffc900037d79d0 R08: ffffffff903cf977 R09: 1ffffffff2079f2e
R10: dffffc0000000000 R11: fffffbfff2079f2f R12: 1ffff110170c7eee
R13: dffffc0000000000 R14: ffff8880b863e940 R15: ffff8880b863f770
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1916/0x4c90 kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6857
 do_nanosleep+0x197/0x600 kernel/time/hrtimer.c:2141
 hrtimer_nanosleep+0x1ec/0x410 kernel/time/hrtimer.c:2188
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1402 [inline]
 __se_sys_clock_nanosleep+0x32b/0x3c0 kernel/time/posix-timers.c:1379
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa379fbfa25
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007ffd5f239c50 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00007fa37a1a5fa0 RCX: 00007fa379fbfa25
RDX: 00007ffd5f239c90 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fa37a1a7ba0 R08: 0000000000000000 R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000020781
R13: 00007ffd5f239db0 R14: ffffffffffffffff R15: 00007ffd5f239dd0
 </TASK>
rcu: rcu_preempt kthread starved for 10501 jiffies! g19265 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:26032 pid:18    tgid:18    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0x190e/0x4c90 kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6857
 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2024
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2226
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 8107 Comm: syz.3.484 Not tainted 6.14.0-rc7-syzkaller-00182-gc7d82913d5f9 #0
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+0x1ba4/0x2d30 kernel/smp.c:885
Code: 03 84 c0 75 7e 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 c0 f4 0b 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 70 f0 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: 0000:ffffc90003b77460 EFLAGS: 00000293
RAX: ffffffff81b5f035 RBX: 1ffff110170c8c99 RCX: ffff888035a4da00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003b77660 R08: ffffffff81b5f000 R09: 1ffffffff28a9908
R10: dffffc0000000000 R11: fffffbfff28a9909 R12: ffff8880b873fb48
R13: ffff8880b86464c8 R14: ffff8880b873fb40 R15: 0000000000000000
FS:  0000555591333500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f75fa7a5fa4 CR3: 000000005c336000 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:966 [inline]
 flush_tlb_mm_range+0x42d/0x710 arch/x86/mm/tlb.c:1054
 flush_tlb_page arch/x86/include/asm/tlbflush.h:255 [inline]
 ptep_clear_flush+0x11a/0x170 mm/pgtable-generic.c:101
 wp_page_copy mm/memory.c:3513 [inline]
 do_wp_page+0x1c64/0x49b0 mm/memory.c:3839
 handle_pte_fault mm/memory.c:5904 [inline]
 __handle_mm_fault+0x2303/0x6ef0 mm/memory.c:6031
 handle_mm_fault+0x3e5/0x8d0 mm/memory.c:6200
 do_user_addr_fault arch/x86/mm/fault.c:1337 [inline]
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x459/0x8b0 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f75fa45725f
Code: 8d 3d 59 7d 1b 00 8b 30 31 c0 e8 6c e3 0d 00 bf 01 00 00 00 e8 02 67 ff ff 66 90 41 56 41 55 41 54 55 48 89 fd 53 48 83 ec 50 <c6> 47 04 01 89 37 c6 47 20 00 84 d2 74 1c 8b 87 98 00 00 00 85 c0
RSP: 002b:00007fff1fa81620 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 00007f75fa7a5fa0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f75fa7a5fa0
RBP: 00007f75fa7a5fa0 R08: 00007f75fa7a5fa0 R09: 0000000000000020
R10: 0000000000000000 R11: 0000000000000000 R12: 00007f75fa7a5fa0
R13: 00007f75fa7a5fa0 R14: 0000000000001b53 R15: 0000000000000003
 </TASK>