rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P9331/1:b..l
rcu: 	(detected by 0, t=10504 jiffies, g=44585, q=413 ncpus=2)
task:kworker/u8:10   state:R  running task     stack:24312 pid:9331  tgid:9331  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound bpf_map_free_deferred
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7234
 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7556
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x205/0xa00 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:unwind_next_frame+0x182/0x2090 arch/x86/kernel/unwind_orc.c:510
Code: f2 83 e2 07 38 d0 7f 08 84 c0 0f 85 24 0a 00 00 48 89 e9 41 0f b6 45 35 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 11 00 <0f> 85 01 18 00 00 4d 8b 7d 48 3c 01 49 83 df 00 4d 85 ff 0f 84 f0
RSP: 0000:ffffc90004d4f6a8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 1ffff920009a9eec
RDX: dffffc0000000000 RSI: ffffffff8c400f00 RDI: ffffffff8e46b928
RBP: ffffc90004d4f760 R08: 0000000032d46002 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000000 R12: ffffc90004d4f768
R13: ffffc90004d4f718 R14: ffffc90004d4f74d R15: ffff888045850000
 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2705 [inline]
 slab_free mm/slub.c:6405 [inline]
 kfree+0x22b/0x6c0 mm/slub.c:6720
 free_one kernel/bpf/memalloc.c:262 [inline]
 free_all.isra.0+0x68/0x150 kernel/bpf/memalloc.c:273
 drain_mem_cache+0x136/0x1d0 kernel/bpf/memalloc.c:635
 bpf_mem_alloc_destroy+0x15b/0x670 kernel/bpf/memalloc.c:748
 trie_free+0xdb/0x120 kernel/bpf/lpm_trie.c:652
 bpf_map_free kernel/bpf/syscall.c:898 [inline]
 bpf_map_free_deferred+0x23e/0x810 kernel/bpf/syscall.c:925
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g44585 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:27528 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7326
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 9624 Comm: syz.4.907 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:get_current arch/x86/include/asm/current.h:23 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xf/0x70 kernel/kcov.c:216
Code: 00 00 00 5b e9 32 5a 13 03 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 8b 05 85 a3 59 12 48 8b 34 24 <65> 48 8b 15 61 a3 59 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00
RSP: 0018:ffffc900069cfb38 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81fd46fd
RDX: 0000000000000001 RSI: ffffffff81fd46d7 RDI: ffff88807dc88000
RBP: ffff8880b8541240 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003
R13: ffffed10170a8249 R14: 0000000000000001 R15: ffff8880b843c880
FS:  00007f3a08a326c0(0000) GS:ffff888123de8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33423ffc CR3: 0000000039341000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 native_pause arch/x86/include/asm/vdso/processor.h:13 [inline]
 cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline]
 csd_lock_wait kernel/smp.c:342 [inline]
 smp_call_function_many_cond+0x587/0x16c0 kernel/smp.c:892
 clock_was_set+0x61c/0x850 kernel/time/hrtimer.c:999
 do_settimeofday64+0x330/0x4d0 kernel/time/timekeeping.c:1684
 do_sys_settimeofday64+0x1dc/0x260 kernel/time/time.c:195
 __do_sys_clock_settime kernel/time/posix-timers.c:1139 [inline]
 __se_sys_clock_settime kernel/time/posix-timers.c:1123 [inline]
 __x64_sys_clock_settime+0x1c1/0x2a0 kernel/time/posix-timers.c:1123
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3a07b9de59
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:00007f3a08a32028 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007f3a07e25fa0 RCX: 00007f3a07b9de59
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000000
RBP: 00007f3a07c33e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3a07e26038 R14: 00007f3a07e25fa0 R15: 00007ffdc8ec2c48
 </TASK>