rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P1147/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=21993, q=1011 ncpus=2)
task:kworker/u8:7    state:R  running task     stack:23624 pid:1147  tgid:1147  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5352 [inline]
 __schedule+0x165c/0x5560 kernel/sched/core.c:6964
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7292
 irqentry_exit+0x5e4/0x700 kernel/entry/common.c:240
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x221/0x350 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 81 60 0e 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 2b 1d 7b 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 d0 4c 11 0a cc 48 8d 3d a8 2f 73
RSP: 0018:ffffc90005a3f900 EFLAGS: 00000286
RAX: 7dcff711d5e75000 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 00000000d31b6674 RSI: ffffffff8e1b3c90 RDI: ffffffff8c287c00
RBP: ffffffff8b77f2ea R08: ffffffff8b77f2ea R09: ffffffff8e75d7e0
R10: dffffc0000000000 R11: fffffbfff202479f R12: 0000000000000002
R13: ffffffff8e75d7e0 R14: 0000000000000000 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 rcu_read_lock include/linux/rcupdate.h:850 [inline]
 batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:764 [inline]
 batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:836 [inline]
 batadv_iv_ogm_schedule+0x45e/0xf50 net/batman-adv/bat_iv_ogm.c:876
 batadv_iv_send_outstanding_bat_ogm_packet+0x6c8/0x7e0 net/batman-adv/bat_iv_ogm.c:1712
 process_one_work+0x9a3/0x1710 kernel/workqueue.c:3288
 process_scheduled_works kernel/workqueue.c:3379 [inline]
 worker_thread+0xba8/0x11e0 kernel/workqueue.c:3465
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: rcu_preempt kthread starved for 10526 jiffies! g21993 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:27512 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5352 [inline]
 __schedule+0x165c/0x5560 kernel/sched/core.c:6964
 __schedule_loop kernel/sched/core.c:7047 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7062
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </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 UID: 0 PID: 7170 Comm: syz.3.139 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 89 fb e8 23 00 00 00 48 8b 3d 94 6e 59 0c 48 89 de 5b e9 e3 13 5e 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0d 78 2e 57 11 65 8b 15 99 2e 57
RSP: 0000:ffffc90005faf388 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8880b8728201 RCX: ffff888034e85b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8880b8728340 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000bf5e60 R12: ffff8880b8728390
R13: dffffc0000000000 R14: ffff8880b8728280 R15: ffff8880347ba180
FS:  00007f67a846c6c0(0000) GS:ffff888125548000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32d24220 CR3: 0000000077218000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 hrtimer_prefer_local kernel/time/hrtimer.c:1334 [inline]
 hrtimer_keep_base kernel/time/hrtimer.c:1352 [inline]
 __hrtimer_start_range_ns kernel/time/hrtimer.c:1372 [inline]
 hrtimer_start_range_ns+0x2b5/0xed0 kernel/time/hrtimer.c:1491
 hrtimer_start include/linux/hrtimer.h:220 [inline]
 stimer_start arch/x86/kvm/hyperv.c:-1 [inline]
 kvm_hv_process_stimers+0xdfe/0x1750 arch/x86/kvm/hyperv.c:893
 vcpu_enter_guest arch/x86/kvm/x86.c:11310 [inline]
 vcpu_run+0x271c/0x7860 arch/x86/kvm/x86.c:11759
 kvm_arch_vcpu_ioctl_run+0x11e6/0x20d0 arch/x86/kvm/x86.c:12107
 kvm_vcpu_ioctl+0xa62/0xfd0 virt/kvm/kvm_main.c:4478
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f67a759aef9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f67a846c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f67a7805fa0 RCX: 00007f67a759aef9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f67a762fee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f67a7806038 R14: 00007f67a7805fa0 R15: 00007fffd0e32c48
 </TASK>