rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=71ec/1/0x4000000000000000 softirq=195010/195010 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=260393, q=85 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 9735 Comm: syz.4.10903 Not tainted 6.6.96-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:advance_sched+0x5ad/0xc80 net/sched/sch_taprio.c:975
Code: ff ff ff ff 7f 49 bc 00 00 00 00 00 fc ff df eb 44 e8 c7 32 e8 f8 49 bc 00 00 00 00 00 fc ff df 48 8b 44 24 48 42 80 3c 20 00 <48> 8b 5c 24 10 74 08 48 89 df e8 84 e1 40 f9 48 8b 1b 42 80 7c 25
RSP: 0018:ffffc900001f0c70 EFLAGS: 00000046
RAX: 1ffff1100b91ad2a RBX: 0000000000000000 RCX: ffff888029a98000
RDX: 0000000000010000 RSI: 0000000004000000 RDI: 0000000000000000
RBP: 1ffff1100b91ad01 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003e17c R12: dffffc0000000000
R13: ffff88805c8d68c8 R14: ffff88805c8d6808 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000069c18000 CR4: 00000000003506e0
DR0: ffffffffffffffff DR1: 0000000000000047 DR2: 0000000000000005
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1755 [inline]
 __hrtimer_run_queues+0x51e/0xc40 kernel/time/hrtimer.c:1819
 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1881
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:account_kernel_stack+0x1b0/0x220 kernel/fork.c:559
Code: 11 e8 74 94 36 00 4d 85 e4 75 16 e8 6a 94 36 00 eb 15 e8 63 94 36 00 e8 ee 65 1f 09 4d 85 e4 74 ea e8 54 94 36 00 fb 49 89 dc <49> 83 fd 38 74 0e e8 45 94 36 00 49 83 c5 08 e9 fc fe ff ff e8 37
RSP: 0018:ffffc90004ad7a00 EFLAGS: 00000293
RAX: ffffffff814f020c RBX: dffffc0000000000 RCX: ffff888029a98000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004ad7ac8 R08: ffffffff8e4a7faf R09: 1ffffffff1c94ff5
R10: dffffc0000000000 R11: fffffbfff1c94ff6 R12: dffffc0000000000
R13: 0000000000000020 R14: ffff88802c398320 R15: 0000000000000000
 exit_task_stack_account+0x2a/0x330 kernel/fork.c:573
 do_exit+0x19a2/0x23c0 kernel/exit.c:916
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
 get_signal+0x12fc/0x1400 kernel/signal.c:2902
 arch_do_signal_or_restart+0x96/0x780 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa3cb78e929
Code: Unable to access opcode bytes at 0x7fa3cb78e8ff.
RSP: 002b:00007fa3cc6120e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fa3cb9b5fa8 RCX: 00007fa3cb78e929
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fa3cb9b5fa8
RBP: 00007fa3cb9b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa3cb9b5fac
R13: 0000000000000000 R14: 00007ffc3d722590 R15: 00007ffc3d722678
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g260393 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:26920 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x14e2/0x4580 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 9733 Comm: syz.4.10903 Not tainted 6.6.96-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:csd_lock_wait kernel/smp.c:311 [inline]
RIP: 0010:smp_call_function_many_cond+0xde4/0x1130 kernel/smp.c:855
Code: 89 ee 83 e6 01 31 ff e8 2a e7 0a 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 65 e3 0a 00 eb 38 f3 90 42 0f b6 04 2b <84> c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 49 e3 0a 00 eb e4 44
RSP: 0018:ffffc900051f7760 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff110171e82f5 RCX: ffff88806a4d1e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900051f78e0 R08: ffffffff90da5557 R09: 1ffffffff21b4aaa
R10: dffffc0000000000 R11: fffffbfff21b4aab R12: ffff8880b8f417a8
R13: dffffc0000000000 R14: ffff8880b8e3d588 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 000000000cb30000 CR4: 00000000003506f0
DR0: ffffffffffffffff DR1: 0000000000000047 DR2: 0000000000000005
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1023
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:87 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:990 [inline]
 flush_tlb_mm_range+0x41e/0x690 arch/x86/mm/tlb.c:1078
 tlb_flush arch/x86/include/asm/tlb.h:20 [inline]
 tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:458 [inline]
 tlb_flush_mmu+0x1b7/0x4f0 mm/mmu_gather.c:299
 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:392
 exit_mmap+0x3f0/0xb50 mm/mmap.c:3311
 __mmput+0x118/0x3c0 kernel/fork.c:1355
 exit_mm+0x1da/0x2c0 kernel/exit.c:569
 do_exit+0x88e/0x23c0 kernel/exit.c:870
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
 __do_sys_exit_group kernel/exit.c:1035 [inline]
 __se_sys_exit_group kernel/exit.c:1033 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1033
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa3cb78e929
Code: Unable to access opcode bytes at 0x7fa3cb78e8ff.
RSP: 002b:00007ffc3d7229d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa3cb78e929
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffc3d722a3c R08: 000000183d722acf R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000089e
R13: 00000000000927c0 R14: 00000000002ea029 R15: 00007ffc3d722a90
 </TASK>