rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P1254/1:b..l
	(detected by 0, t=10502 jiffies, g=34969, q=280)
task:kworker/u4:4    state:R  running task     stack:18808 pid: 1254 ppid:     2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6376
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6780
 irqentry_exit+0x53/0x80 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:lock_acquire+0xf5/0x4f0 kernel/locking/lockdep.c:5596
Code: 00 89 d8 48 0f a3 05 12 9f 86 0c 73 0d e8 13 6b 08 00 84 c0 0f 84 b9 02 00 00 48 c7 c0 c4 7f e9 8d 48 c1 e8 03 42 0f b6 04 28 <84> c0 0f 85 dd 02 00 00 83 3d 80 d2 86 0c 00 0f 84 3f 01 00 00 65
RSP: 0018:ffffc9000512fa80 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8162ad0c
RDX: 0000000000000000 RSI: ffffffff8ad8f7e0 RDI: ffffffff8ad8f7a0
RBP: ffffc9000512fbd8 R08: dffffc0000000000 R09: fffffbfff1bd2986
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000a25f58
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888063d99840
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:312
 rcu_read_lock include/linux/rcupdate.h:739 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
 batadv_nc_worker+0xc1/0x5b0 net/batman-adv/network-coding.c:723
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: rcu_preempt kthread starved for 10520 jiffies! g34969 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:27064 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1f0 kernel/sched/core.c:6459
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x2bf/0x1080 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2145
 kthread+0x3f6/0x4f0 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7902 Comm: syz.3.934 Not tainted 5.15.164-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:check_preemption_disabled+0x2/0x110 lib/smp_processor_id.c:13
Code: 48 c7 c7 a0 fc 92 8a e8 2c 01 00 00 65 ff 0d 01 33 d0 75 5b c3 cc cc cc 48 c7 c7 a0 f7 d8 8a 48 c7 c6 e0 f7 d8 8a eb 00 41 57 <41> 56 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24
RSP: 0018:ffffc900011ef710 EFLAGS: 00000046
RAX: 1ffff11003c5b8cc RBX: 0000000000000046 RCX: ffffc900011ef703
RDX: 0000000000000002 RSI: ffffffff8a8b3ca0 RDI: ffffffff8ad8f800
RBP: ffffc900011ef850 R08: dffffc0000000000 R09: fffffbfff1bd2986
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff9200023def0
R13: 0000000000000046 R14: ffffc900011ef7b0 R15: dffffc0000000000
FS:  00007f1d9cc976c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f07c6cf1000 CR3: 0000000065a3a000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 lockdep_recursion_finish kernel/locking/lockdep.c:436 [inline]
 lock_release+0x5c1/0x9a0 kernel/locking/lockdep.c:5645
 seqcount_lockdep_reader_access+0x10b/0x220 include/linux/seqlock.h:104
 ktime_get+0x31/0x270 kernel/time/timekeeping.c:829
 clockevents_program_event+0xe1/0x310 kernel/time/clockevents.c:326
 hrtimer_start_range_ns+0xab8/0xc50 kernel/time/hrtimer.c:1300
 posixtimer_rearm+0x1ad/0x3f0 kernel/time/posix-timers.c:328
 dequeue_signal+0x1ed/0x520 kernel/signal.c:696
 get_signal+0x52e/0x14e0 kernel/signal.c:2770
 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f1d9e81a9b7
Code: ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89
RSP: 002b:00007f1d9cc97038 EFLAGS: 00000246
RAX: 0000000000000113 RBX: 00007f1d9e9b6f80 RCX: 00007f1d9e81a9b9
RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f1d9e8888d8 R08: 0000000008000f28 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1d9e9b6f80 R15: 00007ffc007b0508
 </TASK>