rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P22445/1:b..l
rcu: (detected by 0, t=10504 jiffies, g=121377, q=750 ncpus=2)
task:syz-executor state:R running task stack:22152 pid:22445 tgid:22445 ppid:22434 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7188
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7369
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
_raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:190
spin_unlock include/linux/spinlock.h:390 [inline]
copy_pte_range mm/memory.c:1331 [inline]
copy_pmd_range+0x4f04/0x5970 mm/memory.c:1392
copy_pud_range mm/memory.c:1429 [inline]
copy_p4d_range mm/memory.c:1453 [inline]
copy_page_range+0xbe8/0x11f0 mm/memory.c:1539
dup_mmap+0xf40/0x1d90 mm/mmap.c:1840
dup_mm kernel/fork.c:1534 [inline]
copy_mm+0x13b/0x4a0 kernel/fork.c:1586
copy_process+0x1f1c/0x4450 kernel/fork.c:2262
kernel_clone+0x284/0x8f0 kernel/fork.c:2723
__do_sys_clone kernel/fork.c:2864 [inline]
__se_sys_clone kernel/fork.c:2848 [inline]
__x64_sys_clone+0x1b6/0x230 kernel/fork.c:2848
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fccfedc5292
RSP: 002b:00007ffc8ebc82d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffc8ebc82d0 RCX: 00007fccfedc5292
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffc8ebc845c R08: 0000000000000000 R09: 0000000000000001
R10: 000055557c8247d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 00000000001b490b R15: 00007ffc8ebc84b0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10503 jiffies! g121377 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=53224
rcu: rcu_preempt kthread starved for 10504 jiffies! g121377 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:27736 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7282
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
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: 3 Comm: pool_workqueue_ Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:rb_insert_color+0xd/0x680 lib/rbtree.c:435
Code: 2e e9 f7 b2 07 00 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 41 57 41 56 41 55 41 54 <53> 48 83 ec 28 49 89 f7 49 89 fc 49 be 00 00 00 00 00 fc ff df 48
RSP: 0018:ffffc90000a08d28 EFLAGS: 00000046
RAX: 1ffffffff34a104a RBX: ffff8880b8728418 RCX: 0000000000000000
RDX: 0000000000000010 RSI: ffff8880b8728418 RDI: ffff88807a944300
RBP: dffffc0000000000 R08: ffff88807a944317 R09: ffff88807a944308
R10: dffffc0000000000 R11: ffffed100f528863 R12: 0000000000000000
R13: ffff88807a944300 R14: ffffffff9a508240 R15: ffffffff9a508250
FS: 0000000000000000(0000) GS:ffff888125314000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e119ff8 CR3: 0000000025304000 CR4: 0000000000350ef0
Call Trace:
__rb_add include/linux/rbtree.h:239 [inline]
rb_add_linked include/linux/rbtree.h:281 [inline]
timerqueue_linked_add+0x262/0x2e0 lib/timerqueue.c:96
enqueue_hrtimer+0x18e/0x2c0 kernel/time/hrtimer.c:1117
__run_hrtimer kernel/time/hrtimer.c:1946 [inline]
__hrtimer_run_queues+0x4d2/0xa20 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x44b/0x950 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:preempt_schedule_irq+0x48/0xa0 kernel/sched/core.c:7512
Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 33 19 da f5 e8 6e 23 14 f6 fb bf 01 00 00 00 13 a3 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 34 25 14 f6 bf 01
RSP: 0018:ffffc90000087b70 EFLAGS: 00000206
RAX: 000000000003ac71 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8dfd7eb5 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff903380f7 R09: 1ffffffff206701e
R10: dffffc0000000000 R11: fffffbfff206701f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
irqentry_exit+0x14f/0x730 kernel/entry/common.c:164
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lockdep_unregister_key+0x2d5/0x350 kernel/locking/lockdep.c:6616
Code: 11 0a 09 00 89 c6 48 c7 c7 30 18 49 96 e8 63 53 19 0a 90 e9 65 fe ff ff e8 e8 94 16 0a 41 f7 c7 00 02 00 00 74 b3 fb 40 84 ed <75> b2 eb c3 90 0f 0b 90 e9 26 ff ff ff 90 0f 0b 90 e9 2e ff ff ff
RSP: 0018:ffffc90000087c90 EFLAGS: 00000246
RAX: 0000000000000046 RBX: ffff88806ab91930 RCX: 0000000000000046
RDX: ffffffff94049398 RSI: ffffffff8dff173e RDI: ffffffff8c289ee0
RBP: ffff88801d2f9e00 R08: ffffffff81af4528 R09: ffffffff8e95cce0
R10: dffffc0000000000 R11: fffffbfff206701f R12: 0000000000000000
R13: ffff88806ab91931 R14: 0000000000001000 R15: 0000000000000a47
wq_unregister_lockdep kernel/workqueue.c:4929 [inline]
pwq_release_workfn+0x6d1/0x8c0 kernel/workqueue.c:5225
kthread_worker_fn+0x4ee/0xb20 kernel/kthread.c:1025
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245