rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P61/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=104545, q=147 ncpus=2)
task:kworker/u8:4    state:R  running task     stack:23632 pid:61    tgid:61    ppid:2      flags:0x00004000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7067
 irqentry_exit+0x36/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:122 [inline]
RIP: 0010:lock_release+0x129/0x6c0 kernel/locking/lockdep.c:5767
Code: 0f 85 ab 02 00 00 65 4c 8b 35 43 0d 98 7e 49 8d be dc 0a 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 18 05 00 00 41
RSP: 0018:ffffc900015c7a98 EFLAGS: 00000a07
RAX: dffffc0000000000 RBX: ffffffff8fe49f98 RCX: ffffffff816bcb99
RDX: 0000000000000000 RSI: ffffffff8b900280 RDI: ffff88801caca8dc
RBP: 1ffff920002b8f55 R08: 0000000000000000 R09: fffffbfff1fc8d9a
R10: ffffffff8fe46cd7 R11: 0000000000000003 R12: ffffffff8dbb1920
R13: ffff88802d3c0ca0 R14: ffff88801cac9e00 R15: ffff88806832d0c0
 rcu_lock_release include/linux/rcupdate.h:339 [inline]
 rcu_read_unlock include/linux/rcupdate.h:812 [inline]
 batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:771 [inline]
 batadv_iv_ogm_schedule_buff+0x761/0x1500 net/batman-adv/bat_iv_ogm.c:825
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:868 [inline]
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:861 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x31e/0x8d0 net/batman-adv/bat_iv_ogm.c:1712
 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: rcu_preempt kthread starved for 10529 jiffies! g104545 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:27872 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6837
 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2202
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 16119 Comm: syz-executor.2 Not tainted 6.10.0-rc3-syzkaller-00022-gcea2a26553ac #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:979 [inline]
RIP: 0010:debug_check_no_obj_freed+0x2ec/0x600 lib/debugobjects.c:1019
Code: b9 00 01 00 00 00 00 ad de 49 89 57 08 48 89 c7 48 89 08 4c 89 68 08 e8 12 c8 ff ff 4c 89 f8 48 89 c2 48 c1 ea 03 80 3c 1a 00 <0f> 84 24 ff ff ff 48 89 c7 48 89 44 24 10 e8 51 a7 5f fd 48 8b 44
RSP: 0018:ffffc9000325fa60 EFLAGS: 00000046
RAX: ffff888067d17620 RBX: dffffc0000000000 RCX: ffffffff816c44ad
RDX: 1ffff1100cfa2ec4 RSI: ffff888039c39590 RDI: ffff88807b9f7788
RBP: ffffc9000325fba0 R08: 0000000000000001 R09: fffff5200064bf3a
R10: 0000000000000003 R11: 0000000000000001 R12: ffff888039c39540
R13: dead000000000122 R14: 000000000000000b R15: ffff888067d17620
FS:  00007fc455c596c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f536000 CR3: 000000001fde8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 slab_free_hook mm/slub.c:2163 [inline]
 slab_free mm/slub.c:4437 [inline]
 kmem_cache_free+0x26f/0x3a0 mm/slub.c:4512
 __sigqueue_free kernel/signal.c:451 [inline]
 __sigqueue_free kernel/signal.c:443 [inline]
 collect_signal+0x315/0x630 kernel/signal.c:594
 __dequeue_signal kernel/signal.c:616 [inline]
 dequeue_signal+0x35f/0x660 kernel/signal.c:639
 get_signal+0x5fb/0x2710 kernel/signal.c:2788
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x14a/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc454e7cea9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc455c59178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fc454fb3f88 RCX: 00007fc454e7cea9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fc454fb3f88
RBP: 00007fc454fb3f80 R08: 00007fc455c596c0 R09: 00007fc455c596c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc454fb3f8c
R13: 000000000000000b R14: 00007ffefa171c90 R15: 00007ffefa171d78
 </TASK>