rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4554/1:b..l
	(detected by 1, t=10502 jiffies, g=14253, q=221)
task:kworker/u4:11   state:R  running task     stack:25344 pid: 4554 ppid:     2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777
 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+0x13f/0x4f0 kernel/locking/lockdep.c:5599
Code: 88 01 00 00 65 48 8b 1d af c1 9f 7e 48 81 c3 ec 0a 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 c4 02 00 00 83 3b 00 <0f> 85 5c 01 00 00 4c 8d bc 24 80 00 00 00 4c 89 fb 48 c1 eb 03 42
RSP: 0018:ffffc90002fb7a20 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8880778e466c RCX: ffffffff8162adbc
RDX: 0000000000000000 RSI: ffffffff8ad8f7a0 RDI: ffffffff8ad8f760
RBP: ffffc90002fb7b70 R08: dffffc0000000000 R09: fffffbfff1bd2a56
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920005f6f4c
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffffff8a10e610
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:312
 rcu_read_lock include/linux/rcupdate.h:739 [inline]
 batadv_nc_process_nc_paths+0xb8/0x350 net/batman-adv/network-coding.c:691
 batadv_nc_worker+0x3d4/0x5b0 net/batman-adv/network-coding.c:732
 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 timer wakeup didn't happen for 10527 jiffies! g14253 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=4111
rcu: rcu_preempt kthread starved for 10528 jiffies! g14253 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:26816 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 schedule+0x11b/0x1f0 kernel/sched/core.c:6456
 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4864 Comm: syz.0.303 Not tainted 5.15.165-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:65
Code: 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01
RSP: 0018:ffffc90002de78e8 EFLAGS: 00000002
RAX: dffffc0000000000 RBX: ffff8880787c23a0 RCX: 0000000000000000
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffff8880787c23b8
RBP: ffff8880b9a2abc8 R08: dffffc0000000000 R09: ffff8880787c23a8
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000001
R13: 1ffff1101734557b R14: 0000000000000010 R15: ffff8880b9a2abd8
FS:  0000555556cef500(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2d991e CR3: 0000000063d7a000 CR4: 00000000003506f0
DR0: 0000000000002800 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 rb_link_node include/linux/rbtree.h:63 [inline]
 rb_add_cached include/linux/rbtree.h:182 [inline]
 timerqueue_add+0x1b1/0x280 lib/timerqueue.c:40
 enqueue_hrtimer+0x1a0/0x390 kernel/time/hrtimer.c:1092
 __hrtimer_start_range_ns kernel/time/hrtimer.c:1259 [inline]
 hrtimer_start_range_ns+0xa9c/0xc50 kernel/time/hrtimer.c:1299
 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:2778
 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: 0033:0x7f16706b79e9
Code: 8d 50 fc 48 89 53 38 89 68 fc 8b 43 28 48 83 c4 38 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 44 00 00 c6 44 24 1e 01 8b 7c 24 18 <48> 89 d6 48 89 54 24 10 e8 5a 1e fe ff 84 c0 0f 85 6d ff ff ff 80
RSP: 002b:00007ffdb9168080 EFLAGS: 00000246
RAX: 0000000000016711 RBX: 00007f16714a4720 RCX: ffffffff842e15cf
RDX: ffffffff842e48e0 RSI: ffffffff842e15cf RDI: 0000000000000016
RBP: 0000000000000000 R08: 00007f167095f000 R09: ffffffff842e4ac1
R10: 00000000842e15d3 R11: 0000000000000016 R12: ffffffff842e4ac1
R13: 00007f16709750f0 R14: 0000000000000008 R15: 0000000000000283
 </TASK>