rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P13603/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=46437, q=668 ncpus=2)
task:syz.1.1869      state:R  running task     stack:24968 pid:13603 tgid:13602 ppid:5829   task_flags:0x40054c flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0x116a/0x5dd0 kernel/sched/core.c:6786
 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6966
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 zap_pte_range mm/memory.c:1765 [inline]
 zap_pmd_range mm/memory.c:1827 [inline]
 zap_pud_range mm/memory.c:1856 [inline]
 zap_p4d_range mm/memory.c:1877 [inline]
 unmap_page_range+0x106b/0x4350 mm/memory.c:1898
 unmap_single_vma.constprop.0+0x153/0x240 mm/memory.c:1941
 unmap_vmas+0x218/0x470 mm/memory.c:1985
 exit_mmap+0x1b9/0xb90 mm/mmap.c:1284
 __mmput+0x12a/0x410 kernel/fork.c:1121
 mmput+0x62/0x70 kernel/fork.c:1144
 exit_mm kernel/exit.c:581 [inline]
 do_exit+0x7c4/0x2bd0 kernel/exit.c:952
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1105
 get_signal+0x2673/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x84/0x110 kernel/entry/common.c:111
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe7fb38e9a9
RSP: 002b:00007fe7f91f60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fe7fb5b5fa8 RCX: 00007fe7fb38e9a9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fe7fb5b5fa8
RBP: 00007fe7fb5b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe7fb5b5fac
R13: 0000000000000000 R14: 00007ffc8e954510 R15: 00007ffc8e9545f8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10491 jiffies! g46437 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=43729
rcu: rcu_preempt kthread starved for 10492 jiffies! g46437 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27784 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0x116a/0x5dd0 kernel/sched/core.c:6786
 __schedule_loop kernel/sched/core.c:6864 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6879
 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2256
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d4/0x6f0 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: 13615 Comm: syz.3.1874 Not tainted 6.16.0-rc7-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:its_return_thunk+0x0/0x10 arch/x86/lib/retpoline.S:412
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 cc cc cc cc cc cc cc <c3> cc 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 e9 5b 8c a2 f5 cc
RSP: 0018:ffffc90000a08d18 EFLAGS: 00000046
RAX: 0000000080010002 RBX: ffff88805687c484 RCX: ffffffff89989943
RDX: ffff8880268fa440 RSI: ffffffff8998983b RDI: 0000000000000006
RBP: 0000000000000001 R08: 0000000000000006 R09: 0000000000000000
R10: 0000000004000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff88805687c408 R14: 0000000004000000 R15: dffffc0000000000
FS:  00007fa69289f6c0(0000) GS:ffff888124820000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000023000 CR3: 000000006b7ba000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 taprio_set_budgets+0x12b/0x310 net/sched/sch_taprio.c:670
 advance_sched+0x5f6/0xc80 net/sched/sch_taprio.c:977
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x1ff/0xad0 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x3f0 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:finish_task_switch.isra.0+0x22a/0xc10 kernel/sched/core.c:5265
Code: fb 09 00 00 44 8b 05 09 85 1f 0f 45 85 c0 0f 85 be 01 00 00 4c 89 e7 e8 a4 f6 ff ff e8 cf cb 39 00 fb 65 48 8b 1d be 12 46 12 <48> 8d bb 18 16 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc90003a776f8 EFLAGS: 00000206
RAX: 00000000000076a5 RBX: ffff8880268fa440 RCX: ffffffff81c3b81f
RDX: 0000000000000000 RSI: ffffffff8de2ff26 RDI: ffffffff8c1573e0
RBP: ffffc90003a77740 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90a94057 R11: 0000000000000001 R12: ffff8880b853a2c0
R13: ffff888032fd8000 R14: 0000000000000001 R15: ffff8880b853b130
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x1172/0x5dd0 kernel/sched/core.c:6786
 __schedule_loop kernel/sched/core.c:6864 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6879
 schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common+0x2fc/0x4e0 kernel/sched/completion.c:116
 rdmsr_safe_on_cpu+0x1dc/0x210 arch/x86/lib/msr-smp.c:181
 msr_read+0x19d/0x250 arch/x86/kernel/msr.c:66
 vfs_read+0x1e1/0xc60 fs/read_write.c:570
 ksys_read+0x12a/0x250 fs/read_write.c:715
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa69198e9a9
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:00007fa69289f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007fa691bb5fa0 RCX: 00007fa69198e9a9
RDX: 0000000000018ff8 RSI: 0000200000019680 RDI: 0000000000000004
RBP: 00007fa691a10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa691bb5fa0 R15: 00007ffe03478bb8
 </TASK>