rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=ab1c/1/0x4000000000000000 softirq=138263/138263 fqs=0
rcu: 	(detected by 1, t=10503 jiffies, g=178361, q=408 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5354 Comm: kworker/u4:0 Not tainted 6.4.0-syzkaller-12365-g8689f4f2ea56 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
Workqueue: bat_events batadv_nc_worker
RIP: 0010:find_held_lock+0x22/0x110 kernel/locking/lockdep.c:5251
Code: e8 c3 06 73 00 eb 9a 90 41 57 44 8d 7a ff 49 63 c7 41 56 49 89 ce 48 8d 04 80 41 55 49 89 f5 41 54 4c 8d a4 c7 c8 0a 00 00 55 <4c> 89 e7 53 89 d3 e8 33 0d bb 08 85 c0 0f 85 87 00 00 00 49 83 ec
RSP: 0018:ffffc90000007c98 EFLAGS: 00000002
RAX: 000000000000000f RBX: 0000000000000003 RCX: ffffc90000007d18
RDX: 0000000000000004 RSI: ffffffff8c9a4700 RDI: ffff88807bb88000
RBP: 1ffff92000000f9b R08: 0000000000000001 R09: fffffbfff1d54e4a
R10: ffffffff8eaa7257 R11: 0000000000000001 R12: ffff88807bb88b40
R13: ffffffff8c9a4700 R14: ffffc90000007d18 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f608094b718 CR3: 0000000050845000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __lock_release kernel/locking/lockdep.c:5436 [inline]
 lock_release+0x1f5/0x670 kernel/locking/lockdep.c:5781
 rcu_lock_release include/linux/rcupdate.h:308 [inline]
 rcu_read_unlock include/linux/rcupdate.h:782 [inline]
 advance_sched+0x746/0xd20 net/sched/sch_taprio.c:998
 __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
 __hrtimer_run_queues+0x604/0xc00 kernel/time/hrtimer.c:1752
 hrtimer_interrupt+0x320/0x7b0 kernel/time/hrtimer.c:1814
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1098 [inline]
 __sysvec_apic_timer_interrupt+0x14a/0x430 arch/x86/kernel/apic/apic.c:1115
 sysvec_apic_timer_interrupt+0x92/0xc0 arch/x86/kernel/apic/apic.c:1109
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:lock_acquire+0x1f5/0x520 kernel/locking/lockdep.c:5729
Code: 3f 9c 7e 83 f8 01 0f 85 b9 02 00 00 9c 58 f6 c4 02 0f 85 a4 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc90016447b30 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92002c88f68 RCX: 4072acd3b9ba66a8
RDX: 1ffff1100f771158 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff230d3d0
R10: ffffffff91869e87 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff8c9a4700 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:303 [inline]
 rcu_read_lock include/linux/rcupdate.h:749 [inline]
 batadv_nc_process_nc_paths.part.0+0xec/0x3f0 net/batman-adv/network-coding.c:687
 batadv_nc_process_nc_paths net/batman-adv/network-coding.c:679 [inline]
 batadv_nc_worker+0xc82/0xfe0 net/batman-adv/network-coding.c:728
 process_one_work+0xa34/0x16f0 kernel/workqueue.c:2597
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2748
 kthread+0x344/0x440 kernel/kthread.c:389
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g178361 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=159044
rcu: rcu_preempt kthread starved for 10503 jiffies! g178361 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:28200 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0xc9a/0x5880 kernel/sched/core.c:6710
 schedule+0xde/0x1a0 kernel/sched/core.c:6786
 schedule_timeout+0x14e/0x2b0 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1609
 rcu_gp_kthread+0x23a/0x360 kernel/rcu/tree.c:1808
 kthread+0x344/0x440 kernel/kthread.c:389
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </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: 5354 Comm: kworker/u4:0 Not tainted 6.4.0-syzkaller-12365-g8689f4f2ea56 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
Workqueue: bat_events batadv_nc_worker
RIP: 0010:__lock_acquire+0xc50/0x5e20 kernel/locking/lockdep.c:5141
Code: 0f 00 00 48 69 db d0 00 00 00 48 81 c3 a0 a2 86 91 48 8d 7b 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 2d 3d 00 00 48 83 7b 40 00 0f 84 41 10 00 00 0f b7 44 24 18
RSP: 0018:ffffc90000007b10 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffffffff919265c0 RCX: ffffffff8165e28b
RDX: 1ffffffff2324cc0 RSI: 0000000000000008 RDI: ffffffff91926600
RBP: ffff88807bb88b40 R08: 0000000000000000 R09: fffffbfff230d409
R10: ffffffff9186a04f R11: 0000000000000001 R12: ffff88807bb88000
R13: 0000000000000040 R14: 000000000000004e R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f608094b718 CR3: 0000000050845000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lock_acquire kernel/locking/lockdep.c:5761 [inline]
 lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5726
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 advance_sched+0xd2/0xd20 net/sched/sch_taprio.c:935
 __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
 __hrtimer_run_queues+0x604/0xc00 kernel/time/hrtimer.c:1752
 hrtimer_interrupt+0x320/0x7b0 kernel/time/hrtimer.c:1814
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1098 [inline]
 __sysvec_apic_timer_interrupt+0x14a/0x430 arch/x86/kernel/apic/apic.c:1115
 sysvec_apic_timer_interrupt+0x92/0xc0 arch/x86/kernel/apic/apic.c:1109
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:lock_acquire+0x1f5/0x520 kernel/locking/lockdep.c:5729
Code: 3f 9c 7e 83 f8 01 0f 85 b9 02 00 00 9c 58 f6 c4 02 0f 85 a4 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc90016447b30 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92002c88f68 RCX: 4072acd3b9ba66a8
RDX: 1ffff1100f771158 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff230d3d0
R10: ffffffff91869e87 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff8c9a4700 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:303 [inline]
 rcu_read_lock include/linux/rcupdate.h:749 [inline]
 batadv_nc_process_nc_paths.part.0+0xec/0x3f0 net/batman-adv/network-coding.c:687
 batadv_nc_process_nc_paths net/batman-adv/network-coding.c:679 [inline]
 batadv_nc_worker+0xc82/0xfe0 net/batman-adv/network-coding.c:728
 process_one_work+0xa34/0x16f0 kernel/workqueue.c:2597
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2748
 kthread+0x344/0x440 kernel/kthread.c:389
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>