rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (0 ticks this GP) idle=9594/1/0x4000000000000000 softirq=78499/78499 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10200/1:b..l P17014/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=77225, q=448 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 17009 Comm: syz.5.4051 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1775 [inline]
RIP: 0010:__hrtimer_run_queues+0x4b3/0xc60 kernel/time/hrtimer.c:1841
Code: af 3c da 0d 01 0f 85 9d 02 00 00 e8 87 5d 12 00 4d 8d 6c 24 3b 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 0f 85 4b 03 00 00 45 0f b6 6d 00 31 ff 44 89 ee e8 56 60 12
RSP: 0018:ffffc90000007d40 EFLAGS: 00000016
RAX: 0000000000000000 RBX: ffff8880b8627d08 RCX: dffffc0000000000
RDX: 0000000000010000 RSI: ffffffff8bc07340 RDI: ffffffff8bc07300
RBP: ffffc90000007e90 R08: ffffffff8f9e1577 R09: 1ffffffff1f3c2ae
R10: dffffc0000000000 R11: fffffbfff1f3c2af R12: ffff888055b32340
R13: ffff888055b3237b R14: ffffffff89677b40 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888125d06000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f12e17156c0 CR3: 0000000059ca4000 CR4: 0000000000350ef0
Call Trace:
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
__sysvec_apic_timer_interrupt+0x10b/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:zap_present_folio_ptes mm/memory.c:1641 [inline]
RIP: 0010:zap_present_ptes mm/memory.c:1709 [inline]
RIP: 0010:do_zap_pte_range mm/memory.c:1810 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1854 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1946 [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+0x1862/0x4370 mm/memory.c:2017
Code: 00 00 00 00 fc ff df 41 80 3c 07 00 74 08 4c 89 f7 e8 52 a0 1a 00 4d 89 26 e9 fa 1b 00 00 e8 45 ea b4 ff ff 8c 24 04 02 00 00 <45> 31 f6 48 8b 74 24 20 e9 dc 05 00 00 e8 2c ea b4 ff 4c 89 fe 48
RSP: 0018:ffffc9000c18f3a0 EFLAGS: 00000287
RAX: 0000000000000001 RBX: 840000004d4ea805 RCX: eaf07bbb9fb3b700
RDX: 0000000000000003 RSI: ffffffff8d9d457d RDI: ffff888024db3c80
RBP: ffffc9000c18f650 R08: ffff88801c9a896b R09: 1ffff1100393512d
R10: dffffc0000000000 R11: ffffed100393512e R12: 0000000000000000
R13: 00007f47a791e000 R14: ffff8880768eb8f0 R15: 1ffff1100ed1d71e
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:1133
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
get_signal+0x1285/0x1340 kernel/signal.c:3034
arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f47a778efc9
Code: Unable to access opcode bytes at 0x7f47a778ef9f.
RSP: 002b:00007f47a86960e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f47a79e5fa8 RCX: 00007f47a778efc9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f47a79e5fa8
RBP: 00007f47a79e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f47a79e6038 R14: 00007ffeb5a54af0 R15: 00007ffeb5a54bd8
task:syz.9.4055 state:R running task stack:26888 pid:17014 tgid:17013 ppid:9981 task_flags:0x40054c flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7113
preempt_schedule+0xae/0xc0 kernel/sched/core.c:7137
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+0x3f/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
zap_pte_range mm/memory.c:1884 [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+0x3a7f/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:1133
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
get_signal+0x1285/0x1340 kernel/signal.c:3034
arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9be6f8efc9
RSP: 002b:00007f9be7ed20e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f9be71e5fa8 RCX: 00007f9be6f8efc9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f9be71e5fac
RBP: 00007f9be71e5fa0 R08: 3fffffffffffffff R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9be71e6038 R14: 00007ffe703fb7d0 R15: 00007ffe703fb8b8
task:syz-executor state:R running task stack:21736 pid:10200 tgid:10200 ppid:10194 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7113
preempt_schedule+0xae/0xc0 kernel/sched/core.c:7137
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+0x3f/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
copy_pte_range mm/memory.c:1329 [inline]
copy_pmd_range+0x7630/0x7f00 mm/memory.c:1389
copy_pud_range mm/memory.c:1426 [inline]
copy_p4d_range mm/memory.c:1450 [inline]
copy_page_range+0xc14/0x1270 mm/memory.c:1538
dup_mmap+0xf4c/0x1b10 mm/mmap.c:1834
dup_mm kernel/fork.c:1489 [inline]
copy_mm+0x13c/0x4b0 kernel/fork.c:1541
copy_process+0x1706/0x3c00 kernel/fork.c:2181
kernel_clone+0x21e/0x840 kernel/fork.c:2609
__do_sys_clone kernel/fork.c:2750 [inline]
__se_sys_clone kernel/fork.c:2734 [inline]
__x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2734
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: 0033:0x7f12e0985713
RSP: 002b:00007ffed7f9bef8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f12e0985713
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 00005555628907d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 0000000000082348 R15: 00007ffed7f9c090
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g77225 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=42937
rcu: rcu_preempt kthread starved for 10502 jiffies! g77225 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27288 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7026
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+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245