rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=d10c/1/0x4000000000000000 softirq=12191/12192 fqs=1
rcu: 	(detected by 1, t=10505 jiffies, g=10901, q=1179 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11 Comm: kworker/u4:0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: bat_events batadv_bla_periodic_work
RIP: 0010:__lock_acquire+0x190/0x7c80 kernel/locking/lockdep.c:-1
Code: 31 f6 48 8b bc 24 88 00 00 00 44 89 fe 31 d2 e8 b6 dd ff ff 49 b8 00 00 00 00 00 fc ff df 49 89 c5 48 85 c0 0f 84 21 1a 00 00 <48> 8b 44 24 20 48 8d 98 d8 0a 00 00 48 89 d8 48 c1 e8 03 48 89 44
RSP: 0018:ffffc900000078c0 EFLAGS: 00000086
RAX: 1ffff11004a57461 RBX: 1ffff92000000f3c RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880252ba300
RBP: ffffc90000007b08 R08: dffffc0000000000 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff1c951e6 R12: 0000000000000001
R13: ffffffff9077a360 R14: ffff8880252ba308 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000300 CR3: 0000000060723000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
 __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+0xc5/0xc80 net/sched/sch_taprio.c:940
 __run_hrtimer kernel/time/hrtimer.c:1755 [inline]
 __hrtimer_run_queues+0x51e/0xc40 kernel/time/hrtimer.c:1819
 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1881
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:queue_delayed_work_on+0x190/0x1e0 kernel/workqueue.c:1992
Code: 4d 85 ed 75 16 e8 b0 17 2f 00 eb 15 e8 a9 17 2f 00 e8 14 81 17 09 4d 85 ed 74 ea e8 9a 17 2f 00 fb 48 c7 44 24 20 0e 36 e0 45 <48> b8 00 00 00 00 00 fc ff df 49 c7 04 06 00 00 00 00 66 41 c7 44
RSP: 0018:ffffc90000107980 EFLAGS: 00000293
RAX: ffffffff81567806 RBX: 0000000000000000 RCX: ffff88801b25bc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000107a50 R08: ffffffff90da560f R09: 1ffffffff21b4ac1
R10: dffffc0000000000 R11: fffffbfff21b4ac2 R12: ffff88807a4c9001
R13: 0000000000000200 R14: 1ffff92000020f34 R15: 0000000000000000
 queue_delayed_work include/linux/workqueue.h:577 [inline]
 batadv_bla_periodic_work+0x9c1/0xac0 net/batman-adv/bridge_loop_avoidance.c:1509
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10494 jiffies! g10901 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=7229
rcu: rcu_preempt kthread starved for 10495 jiffies! g10901 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:26568 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </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: 11 Comm: kworker/u4:0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: bat_events batadv_bla_periodic_work
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:84 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:127 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:178 [inline]
RIP: 0010:kasan_check_range+0x7f/0x290 mm/kasan/generic.c:187
Code: 49 c1 e9 03 48 bb 01 00 00 00 00 fc ff df 4d 8d 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 41 01 00 00 4c 89 cb <48> f7 d3 4c 01 fb 41 80 3b 00 0f 85 cc 01 00 00 49 ff c3 48 ff c3
RSP: 0018:ffffc90000007b08 EFLAGS: 00000002
RAX: 00000000ffffff01 RBX: 1ffffffff2e0b1d6 RCX: ffffffff81685102
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff97058eb0
RBP: ffffc90000007bf0 R08: ffffffff97058eb3 R09: 1ffffffff2e0b1d6
R10: dffffc0000000000 R11: fffffbfff2e0b1d6 R12: 0000000000000001
R13: ffffffff97058eb8 R14: fffffbfff2e0b1d7 R15: 1ffffffff2e0b1d6
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000300 CR3: 0000000060723000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
 atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1294 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:111 [inline]
 do_raw_spin_lock+0x112/0x2c0 kernel/locking/spinlock_debug.c:115
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0xb4/0xf0 kernel/locking/spinlock.c:162
 debug_object_activate+0x6c/0x4b0 lib/debugobjects.c:709
 debug_hrtimer_activate kernel/time/hrtimer.c:450 [inline]
 debug_activate kernel/time/hrtimer.c:505 [inline]
 enqueue_hrtimer+0x30/0x370 kernel/time/hrtimer.c:1113
 __run_hrtimer kernel/time/hrtimer.c:1772 [inline]
 __hrtimer_run_queues+0x637/0xc40 kernel/time/hrtimer.c:1819
 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1881
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:queue_delayed_work_on+0x190/0x1e0 kernel/workqueue.c:1992
Code: 4d 85 ed 75 16 e8 b0 17 2f 00 eb 15 e8 a9 17 2f 00 e8 14 81 17 09 4d 85 ed 74 ea e8 9a 17 2f 00 fb 48 c7 44 24 20 0e 36 e0 45 <48> b8 00 00 00 00 00 fc ff df 49 c7 04 06 00 00 00 00 66 41 c7 44
RSP: 0018:ffffc90000107980 EFLAGS: 00000293
RAX: ffffffff81567806 RBX: 0000000000000000 RCX: ffff88801b25bc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000107a50 R08: ffffffff90da560f R09: 1ffffffff21b4ac1
R10: dffffc0000000000 R11: fffffbfff21b4ac2 R12: ffff88807a4c9001
R13: 0000000000000200 R14: 1ffff92000020f34 R15: 0000000000000000
 queue_delayed_work include/linux/workqueue.h:577 [inline]
 batadv_bla_periodic_work+0x9c1/0xac0 net/batman-adv/bridge_loop_avoidance.c:1509
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>