rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (2 ticks this GP) idle=c884/1/0x4000000000000000 softirq=29432/29432 fqs=0
rcu: 	(detected by 1, t=10503 jiffies, g=20377, q=1557 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 3462 Comm: kworker/u8:6 Not tainted 6.15.0-syzkaller-10401-gdee264c16a63 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
RIP: 0010:__lock_is_held kernel/locking/lockdep.c:5602 [inline]
RIP: 0010:lock_is_held_type+0x95/0x190 kernel/locking/lockdep.c:5943
Code: c7 5c 14 0b 8d e8 db 14 00 00 65 ff 05 c4 78 f9 06 83 bb f0 0a 00 00 00 7e 4b 44 89 fd 49 89 df 49 81 c7 f8 0a 00 00 45 31 e4 <49> 83 fc 31 73 24 4c 89 ff 4c 89 f6 e8 5a 02 00 00 85 c0 75 2a 49
RSP: 0018:ffffc90000007c28 EFLAGS: 00000093
RAX: 0000000000000004 RBX: ffff8880310d9e00 RCX: 0000000000000000
RDX: ffff8880310d9e00 RSI: ffff8880678b0300 RDI: ffff8880310da8f8
RBP: 00000000ffffffff R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f7c R12: 0000000000000001
R13: 0000000000000046 R14: ffff8880678b0300 R15: ffff8880310da920
FS:  0000000000000000(0000) GS:ffff8881268d4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fae39400218 CR3: 0000000031c32000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_is_held include/linux/lockdep.h:249 [inline]
 advance_sched+0x1ce/0xc80 net/sched/sch_taprio.c:929
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x525/0xc40 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x457/0xa90 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x104/0x3f0 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x171/0x350 kernel/locking/lockdep.c:5875
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 c9 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 4f 16 58 10 <48> 3b 44 24 58 0f 85 ea 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000c7b6c98 EFLAGS: 00000206
RAX: 72c2a95329ff8a00 RBX: 0000000000000000 RCX: 72c2a95329ff8a00
RDX: 0000000020fc49c4 RSI: ffffffff8d283ff1 RDI: ffffffff8b5dad60
RBP: ffffffff81715081 R08: ffffffff8d93c040 R09: ffffffff81715081
R10: ffffc9000c7b6e58 R11: ffffffff81ab44c0 R12: 0000000000000002
R13: ffffffff8d93c040 R14: 0000000000000000 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:841 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
 unwind_next_frame+0xbe/0x2390 arch/x86/kernel/unwind_orc.c:479
 arch_stack_walk+0x118/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3a/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __kmalloc_cache_noprof+0x220/0x3b0 mm/slub.c:4358
 kmalloc_noprof include/linux/slab.h:905 [inline]
 add_stack_record_to_list mm/page_owner.c:172 [inline]
 inc_stack_record_count mm/page_owner.c:214 [inline]
 __set_page_owner+0x258/0x490 mm/page_owner.c:333
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x230/0x280 mm/page_alloc.c:1710
 prep_new_page mm/page_alloc.c:1718 [inline]
 get_page_from_freelist+0x2b7f/0x2d30 mm/page_alloc.c:3680
 __alloc_frozen_pages_noprof+0x17d/0x370 mm/page_alloc.c:4970
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301
 alloc_slab_page mm/slub.c:2450 [inline]
 allocate_slab+0x8a/0x390 mm/slub.c:2618
 new_slab mm/slub.c:2672 [inline]
 ___slab_alloc+0xc48/0x14c0 mm/slub.c:3858
 __slab_alloc mm/slub.c:3948 [inline]
 __slab_alloc_node mm/slub.c:4023 [inline]
 slab_alloc_node mm/slub.c:4184 [inline]
 __do_kmalloc_node mm/slub.c:4326 [inline]
 __kmalloc_node_track_caller_noprof+0x2e8/0x4c0 mm/slub.c:4346
 kmalloc_reserve+0x136/0x290 net/core/skbuff.c:601
 pskb_expand_head+0x18a/0x1140 net/core/skbuff.c:2241
 __skb_cow include/linux/skbuff.h:3777 [inline]
 skb_cow_head include/linux/skbuff.h:3811 [inline]
 batadv_skb_head_push+0x165/0x200 net/batman-adv/mesh-interface.c:71
 batadv_send_skb_packet+0xf6/0x6d0 net/batman-adv/send.c:86
 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:392 [inline]
 batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:420 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x62b/0x7e0 net/batman-adv/bat_iv_ogm.c:1708
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xada/0x1780 kernel/workqueue.c:3321
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3402
 kthread+0x70a/0x890 kernel/kthread.c:464
 ret_from_fork+0x3f4/0x750 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g20377 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=8726
rcu: rcu_preempt kthread starved for 10503 jiffies! g20377 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:26680 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5392 [inline]
 __schedule+0x16f1/0x4c90 kernel/sched/core.c:6781
 __schedule_loop kernel/sched/core.c:6859 [inline]
 schedule+0x161/0x360 kernel/sched/core.c:6874
 schedule_timeout+0x127/0x260 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2fd/0x1520 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:2256
 kthread+0x70a/0x890 kernel/kthread.c:464
 ret_from_fork+0x3f4/0x750 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>