rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P29077/1:b..l
	(detected by 1, t=10502 jiffies, g=120829, q=11394)
task:syz.4.5407      state:R  running task     stack:26960 pid:29077 ppid: 27076 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x60 kernel/kcov.c:205
Code: 84 00 00 00 00 00 53 48 89 fb e8 17 00 00 00 48 8b 3d 50 c4 10 0c 48 89 de 5b e9 27 55 44 00 00 00 cc cc 00 00 cc 48 8b 04 24 <65> 48 8b 0d a4 39 89 7e 65 8b 15 a5 39 89 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc9000327fab0 EFLAGS: 00000297
RAX: ffffffff818fe419 RBX: 000000001b9341d2 RCX: 0000000000000005
RDX: ffffffff818fe3ff RSI: ffffffff8c396200 RDI: 0000000000000001
RBP: 000000001b9341d2 R08: ffff888025d25940 R09: 000000000000000c
R10: 000000000000000c R11: 0000000000000000 R12: 000000001b9341d2
R13: 1ffff1100b556a03 R14: ffff88805d69f758 R15: 0000000000000000
 jhash include/linux/jhash.h:88 [inline]
 htab_map_hash+0x269/0x6d0 kernel/bpf/hashtab.c:584
 __htab_lru_percpu_map_update_elem+0xfd/0x800 kernel/bpf/hashtab.c:1281
 bpf_percpu_hash_update+0xf5/0x1d0 kernel/bpf/hashtab.c:2240
 bpf_map_update_value+0x25e/0x650 kernel/bpf/syscall.c:198
 generic_map_update_batch+0x52d/0x7d0 kernel/bpf/syscall.c:1430
 bpf_map_do_batch+0x466/0x600 kernel/bpf/syscall.c:-1
 __sys_bpf+0x671/0x6f0 kernel/bpf/syscall.c:-1
 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
 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: 0033:0x7fd17d02ce59
RSP: 002b:00007fd17b286028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fd17d2a5fa0 RCX: 00007fd17d02ce59
RDX: 0000000000000038 RSI: 00002000000000c0 RDI: 000000000000001a
RBP: 00007fd17d0c2d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd17d2a6038 R14: 00007fd17d2a5fa0 R15: 00007ffe30b8d098
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g120829 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=57408
rcu: rcu_preempt kthread starved for 10502 jiffies! g120829 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:27472 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 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
 </TASK>
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: 29086 Comm: syz.1.5408 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:__kthread_should_park+0x9d/0xe0 kernel/kthread.c:142
Code: 08 00 00 00 e8 24 34 6e 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 7e 32 6e 00 48 8b 1b 83 e3 04 31 ff 48 89 de <e8> 7e 17 29 00 c1 eb 02 89 d8 5b 41 5e 41 5f 5d c3 e8 8d 13 29 00
RSP: 0018:ffffc90000007f18 EFLAGS: 00000046
RAX: 1ffff11027fc3c80 RBX: 0000000000000000 RCX: ffffffff8150224c
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000200000 R08: ffff88813fe1e407 R09: 1ffff11027fc3c80
R10: dffffc0000000000 R11: ffffed1027fc3c81 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88813fe21dec R15: dffffc0000000000
FS:  0000555578bcc500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1b70097540 CR3: 000000007bb83000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 ksoftirqd_running kernel/softirq.c:95 [inline]
 invoke_softirq kernel/softirq.c:440 [inline]
 __irq_exit_rcu+0x12b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0x9d/0xc0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 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:ffffc90002f3fcc0 EFLAGS: 00000206
RAX: 3b3ba5fc33432500 RBX: 1ffff920005e7f9c RCX: 3b3ba5fc33432500
RDX: dffffc0000000000 RSI: ffffffff8a2b3100 RDI: ffffffff8a7a0700
RBP: ffffc90002f3fd88 R08: ffffffff901d60cf R09: 1ffffffff203ac19
R10: dffffc0000000000 R11: fffffbfff203ac1a R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8c323860
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock+0x85/0x90 include/linux/rcupdate.h:772
 dput+0xc0/0x1a0 fs/dcache.c:886
 __fput+0x5ee/0x930 fs/file_table.c:319
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f1b70049e59
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:00007fff63077a48 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f1b702c4da0 RCX: 00007f1b70049e59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f1b702c4da0 R08: 00007f1b702c3128 R09: 0000000000000000
R10: 000000000003fd88 R11: 0000000000000246 R12: 0000000000100fc9
R13: 00007f1b702c309c R14: 0000000000100cf7 R15: 00007fff63077b50
 </TASK>