rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P29875/1:b..l
(detected by 1, t=10504 jiffies, g=130069, q=529)
task:rm state:R running task stack:26736 pid:29875 ppid: 29838 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6571
preempt_schedule+0xbc/0xd0 kernel/sched/core.c:6596
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
__raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:404 [inline]
filemap_map_pages+0x1054/0x13b0 mm/filemap.c:3353
do_fault_around mm/memory.c:4243 [inline]
do_read_fault mm/memory.c:4258 [inline]
do_fault mm/memory.c:4392 [inline]
handle_pte_fault mm/memory.c:4650 [inline]
__handle_mm_fault mm/memory.c:4785 [inline]
handle_mm_fault+0x25bc/0x4410 mm/memory.c:4883
do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1355
handle_page_fault arch/x86/mm/fault.c:1443 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1496
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7fd4acb4f9c0
RSP: 002b:00007fffc15cb508 EFLAGS: 00010246
RAX: 00007fd4acb4f9c0 RBX: 00007fd4acad5f18 RCX: 00007fd4acd515f0
RDX: 00007fd4acab8580 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fffc15cb630 R08: 0000000000000000 R09: 0000000000000000
R10: 00007fd4acab8580 R11: 00007fd4acaaf000 R12: 00007fd4acd515f0
R13: 00007fd4acad62d8 R14: 00007fd4acc7fd58 R15: 00007fd4acaaf000
rcu: rcu_preempt kthread timer wakeup didn't happen for 10503 jiffies! g130069 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=97758
rcu: rcu_preempt kthread starved for 10504 jiffies! g130069 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:27344 pid: 15 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117
rcu_gp_fqs_loop+0x2be/0x11d0 kernel/rcu/tree.c:1972
rcu_gp_kthread+0x9b/0x370 kernel/rcu/tree.c:2145
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 29877 Comm: syz.6.6421 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4711 [inline]
RIP: 0010:__lock_acquire+0x974/0x7d10 kernel/locking/lockdep.c:4962
Code: b8 00 00 00 00 00 fc ff df 48 8b 84 24 90 00 00 00 42 0f b6 04 00 84 c0 0f 85 61 01 00 00 83 3d c1 ae d0 14 00 74 6a 45 31 f6 <49> 81 c6 b8 00 00 00 4c 89 f0 48 c1 e8 03 42 0f b6 04 00 84 c0 0f
RSP: 0018:ffffc90000006d60 EFLAGS: 00000006
RAX: 0000000000000fc0 RBX: 0000000000000003 RCX: ffffffff815d2075
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff901d60c0
RBP: ffffc90000006fb0 R08: dffffc0000000000 R09: 1ffffffff203ac18
R10: dffffc0000000000 R11: fffffbfff203ac19 R12: ffff88802c7464c8
R13: ffff88802c746402 R14: ffffffff8fb5ef40 R15: ffff88802c7464c8
FS: 00007f097d3fc6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc7317d23e8 CR3: 000000002cefa000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
rcu_read_lock include/linux/rcupdate.h:740 [inline]
__perf_event_output kernel/events/core.c:7800 [inline]
perf_event_output_forward+0xbc/0x2e0 kernel/events/core.c:7822
__perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
perf_swevent_overflow kernel/events/core.c:9591 [inline]
perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9629
perf_tp_event+0x383/0xbf0 kernel/events/core.c:10047
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
perf_trace_preemptirq_template+0x2aa/0x360 include/trace/events/preemptirq.h:14
trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 d2 df 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900000077c0 EFLAGS: 00000206
RAX: 241c5b43f29e5100 RBX: 1ffff92000000efc RCX: 241c5b43f29e5100
RDX: dffffc0000000000 RSI: ffffffff8a2b3100 RDI: ffffffff8a7a0700
RBP: ffffc900000078a0 R08: ffffffff901d61c7 R09: 1ffffffff203ac38
R10: dffffc0000000000 R11: fffffbfff203ac39 R12: ffffffff8c323800
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
rcu_read_unlock include/linux/rcupdate.h:772 [inline]
ndisc_send_skb+0xde0/0x1500 net/ipv6/ndisc.c:521
addrconf_rs_timer+0x2d1/0x630 net/ipv6/addrconf.c:3956
call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
expire_timers kernel/time/timer.c:1699 [inline]
__run_timers+0x53e/0x800 kernel/time/timer.c:1970
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
handle_softirqs+0x339/0x830 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:account_kernel_stack+0x22c/0x390 kernel/fork.c:387
Code: 85 e4 75 1c e8 55 9c 31 00 48 83 fb 38 75 1d eb 29 e8 48 9c 31 00 e8 e3 2f 75 08 4d 85 e4 74 e4 e8 39 9c 31 00 fb 48 83 fb 38 <74> 0e e8 2d 9c 31 00 48 83 c3 08 e9 ad fe ff ff e8 1f 9c 31 00 e9
RSP: 0018:ffffc9000314f760 EFLAGS: 00000297
RAX: ffffffff814799d7 RBX: 0000000000000010 RCX: ffff88802c745940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000314f868 R08: ffffffff901d61cf R09: 1ffffffff203ac39
R10: dffffc0000000000 R11: fffffbfff203ac3a R12: 0000000000000200
R13: 1ffff92000629ef0 R14: ffff8880616623a0 R15: 0000000000000000
release_task_stack kernel/fork.c:432 [inline]
put_task_stack+0x8f/0x140 kernel/fork.c:444
finish_task_switch+0x26f/0x640 kernel/sched/core.c:4961
context_switch kernel/sched/core.c:5052 [inline]
__schedule+0x11f7/0x43c0 kernel/sched/core.c:6395
preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6799
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:perf_install_in_context+0x795/0x920 kernel/events/core.c:3040
Code: 0d e0 ff 48 8b 7c 24 10 48 8b 74 24 18 e8 63 d6 01 00 eb 05 e8 1c 0d e0 ff 48 89 df e8 34 10 2d 08 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 27 00 00 00 00 4b c7 44 27 08 00 00 00 00 43 c7 44 27 10
RSP: 0018:ffffc9000314fc40 EFLAGS: 00000293
RAX: ffffffff81992872 RBX: 0000000000000000 RCX: ffff88802c745940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000314fd90 R08: ffffffff901d61cf R09: 1ffffffff203ac39
R10: dffffc0000000000 R11: fffffbfff203ac3a R12: dffffc0000000000
R13: ffff88802c745988 R14: ffffc9000314fcc0 R15: 1ffff92000629f94
__do_sys_perf_event_open kernel/events/core.c:12793 [inline]
__se_sys_perf_event_open+0x12b3/0x1bb0 kernel/events/core.c:12387
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f097f1a2e59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f097d3fc028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f097f41bfa0 RCX: 00007f097f1a2e59
RDX: ffffff7fffffffff RSI: 0000000000000000 RDI: 0000200000000480
RBP: 00007f097f238d6f R08: 0000000000000008 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f097f41c038 R14: 00007f097f41bfa0 R15: 00007fffca1a2338