rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (0 ticks this GP) idle=3f6c/1/0x4000000000000000 softirq=59672/59672 fqs=1
rcu: (detected by 1, t=10502 jiffies, g=46373, q=127 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11380 Comm: syz.5.1637 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:hlock_class kernel/locking/lockdep.c:234 [inline]
RIP: 0010:__lock_acquire+0xa4f/0xd20 kernel/locking/lockdep.c:5234
Code: e5 ff 90 0f 0b 90 90 90 31 c0 48 8b 3c 24 48 83 78 40 00 0f 84 8c 02 00 00 41 8b 46 20 25 ff 1f 00 00 48 0f a3 05 61 bd 2b 12 <73> 10 48 69 c0 c8 00 00 00 48 8d 80 30 33 6b 93 eb 40 83 3d c8 4c
RSP: 0018:ffffc90000007b30 EFLAGS: 00000007
RAX: 0000000000000ff9 RBX: 0000000000000003 RCX: 000000002682c73a
RDX: 0000000003f27b7d RSI: 0000000088877718 RDI: ffff88807a17bc80
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff899f5644
R10: dffffc0000000000 R11: ffffffff899f5580 R12: 0000000000000ffa
R13: ffff88807a17c7b0 R14: ffff88807a17c828 R15: 79486d992682c73a
FS: 0000000000000000(0000) GS:ffff8881259f9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34a20ff8 CR3: 000000000e138000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
advance_sched+0xc4/0xc90 net/sched/sch_taprio.c:929
__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
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:_compound_head include/linux/page-flags.h:286 [inline]
RIP: 0010:__folio_rmap_sanity_checks include/linux/rmap.h:416 [inline]
RIP: 0010:__folio_remove_rmap mm/rmap.c:1692 [inline]
RIP: 0010:folio_remove_rmap_ptes+0x11c/0xfa0 mm/rmap.c:1804
Code: 2a 5e ae ff 4d 8d 77 08 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 10 64 12 00 4d 8b 36 4c 89 f6 48 83 e6 01 31 ff df 62 ae ff 4c 89 f0 48 83 e0 01 48 89 1c 24 0f 85 2e 09 00 00
RSP: 0018:ffffc9000bd3f538 EFLAGS: 00000246
RAX: 1ffffd40002726b1 RBX: ffffea0001393580 RCX: ffff88807a17bc80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffea0001393587 R09: 1ffffd40002726b0
R10: dffffc0000000000 R11: fffff940002726b1 R12: dffffc0000000000
R13: 0000000000012c67 R14: 0000000000000000 R15: ffffea0001393580
zap_present_folio_ptes mm/memory.c:1651 [inline]
zap_present_ptes mm/memory.c:1709 [inline]
do_zap_pte_range mm/memory.c:1810 [inline]
zap_pte_range mm/memory.c:1854 [inline]
zap_pmd_range mm/memory.c:1946 [inline]
zap_pud_range mm/memory.c:1975 [inline]
zap_p4d_range mm/memory.c:1996 [inline]
unmap_page_range+0x1f7f/0x4370 mm/memory.c:2017
unmap_single_vma mm/memory.c:2060 [inline]
unmap_vmas+0x399/0x580 mm/memory.c:2104
exit_mmap+0x240/0xb40 mm/mmap.c:1280
__mmput+0x118/0x430 kernel/fork.c:1148
exit_mm+0x1da/0x2c0 kernel/exit.c:582
do_exit+0x648/0x2300 kernel/exit.c:954
do_group_exit+0x21c/0x2d0 kernel/exit.c:1107
__do_sys_exit_group kernel/exit.c:1118 [inline]
__se_sys_exit_group kernel/exit.c:1116 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1116
x64_sys_call+0x21f7/0x2200 arch/x86/include/generated/asm/syscalls_64.h:232
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: 0033:0x7f4c0898ebe9
Code: Unable to access opcode bytes at 0x7f4c0898ebbf.
RSP: 002b:00007fff81cc32b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4c0898ebe9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff81cc331c R08: 0000000981cc33af R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000107
R13: 00000000000927c0 R14: 000000000004c4fb R15: 00007fff81cc3370
rcu: rcu_preempt kthread starved for 10500 jiffies! g46373 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:27256 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
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
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 11384 Comm: syz.1.1638 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 16 77 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 c1 72 0b 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 a5 72
RSP: 0018:ffffc9000baef5a0 EFLAGS: 00000246
RAX: ffffffff81b5531b RBX: 1ffff110170c8355 RCX: 0000000000080000
RDX: ffffc90004b03000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000baef720 R08: ffffffff8fc3ee37 R09: 1ffffffff1f87dc6
R10: dffffc0000000000 R11: fffffbfff1f87dc7 R12: ffff8880b8641aa8
R13: dffffc0000000000 R14: ffff8880b873b1c0 R15: 0000000000000000
FS: 00007ff16f4c56c0(0000) GS:ffff888125af9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3321bff8 CR3: 000000004ed4e000 CR4: 00000000003526f0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1044
on_each_cpu include/linux/smp.h:71 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2653 [inline]
smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2863
__static_call_transform+0x4eb/0x750 arch/x86/kernel/static_call.c:111
arch_static_call_transform+0x98/0xc0 arch/x86/kernel/static_call.c:-1
__static_call_update+0xe4/0x5d0 kernel/static_call_inline.c:147
tracepoint_update_call kernel/tracepoint.c:271 [inline]
tracepoint_add_func+0x91e/0xa10 kernel/tracepoint.c:312
tracepoint_probe_register_prio_may_exist+0x5f/0xa0 kernel/tracepoint.c:435
bpf_raw_tp_link_attach+0x4f0/0x6c0 kernel/bpf/syscall.c:4152
bpf_raw_tracepoint_open+0x1b2/0x220 kernel/bpf/syscall.c:4183
__sys_bpf+0x75a/0x870 kernel/bpf/syscall.c:6071
__do_sys_bpf kernel/bpf/syscall.c:6139 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6137 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6137
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: 0033:0x7ff16e58ebe9
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:00007ff16f4c5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007ff16e7c5fa0 RCX: 00007ff16e58ebe9
RDX: 0000000000000010 RSI: 0000200000000280 RDI: 0000000000000011
RBP: 00007ff16e611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff16e7c6038 R14: 00007ff16e7c5fa0 R15: 00007ffe9d42f7c8