rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=14309, q=488 ncpus=2)
task:kworker/u4:0    state:R  running task     stack:22320 pid:11    ppid:2      flags:0x00004000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7009
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x60 kernel/kcov.c:234
Code: f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 8d 7e 01 8b 89 fc 15 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 <c3> 0f 1f 00 f3 0f 1e fa 48 8b 04 24 65 48 8b 15 f0 29 7e 7e 65 8b
RSP: 0018:ffffc900001079b8 EFLAGS: 00000293
RAX: ffffffff8a31fdab RBX: fffffffffffffe38 RCX: ffff88801be43c00
RDX: 0000000000000000 RSI: ffffffff8afc70a0 RDI: ffffffff8afc7060
RBP: ffffc90000107b00 R08: dffffc0000000000 R09: 1ffffffff21b4aa0
R10: dffffc0000000000 R11: fffffbfff21b4aa1 R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880302468a4
 batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:754 [inline]
 batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:824 [inline]
 batadv_iv_ogm_schedule+0x4cb/0xe90 net/batman-adv/bat_iv_ogm.c:867
 batadv_iv_send_outstanding_bat_ogm_packet+0x731/0x840 net/batman-adv/bat_iv_ogm.c:1711
 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 starved for 9155 jiffies! g14309 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:27088 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
 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6866
 preempt_schedule+0xab/0xc0 kernel/sched/core.c:6890
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0xfa/0x110 kernel/locking/spinlock.c:194
 __mod_timer+0x984/0xdb0 kernel/time/timer.c:1134
 schedule_timeout+0x15b/0x280 kernel/time/timer.c:2166
 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6335 Comm: syz.2.104 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:fpregs_assert_state_consistent+0x0/0xe0 arch/x86/kernel/fpu/core.c:816
Code: e8 85 71 54 00 e9 4c ff ff ff e8 7b 71 54 00 48 bd 00 00 00 00 00 fc ff df e9 a6 fd ff ff 66 2e 0f 1f 84 00 00 00 00 00 66 90 <f3> 0f 1e fa 55 41 57 41 56 53 49 be 00 00 00 00 00 fc ff df e8 47
RSP: 0018:ffffc9000bd17ee8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ae6c9b2c61177b00
RDX: 0000000000000000 RSI: ffffffff8afc70a0 RDI: ffffffff8afc7060
RBP: ffffc9000bd17f48 R08: ffffffff8e4a912f R09: 1ffffffff1c95225
R10: dffffc0000000000 R11: fffffbfff1c95226 R12: 0000000000000000
R13: 0000000000000000 R14: ffffc9000bd17f58 R15: ffff888026ca0000
FS:  00007fabd80d06c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 0000000052a20000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 arch_exit_to_user_mode_prepare arch/x86/include/asm/entry-common.h:56 [inline]
 exit_to_user_mode_prepare+0x58/0x140 kernel/entry/common.c:212
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fabd71b7320
Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d 4a 3e 08 00 e8 f5 8f f8 ff 0f 1f 44 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <83> ff 21 74 0b c3 66 2e 0f 1f 84 00 00 00 00 00 55 53 48 89 f3 48
RSP: 002b:00007fabd80cfb38 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fabd73c5fa8 RCX: 00007fabd718ebe9
RDX: 00007fabd80cfb40 RSI: 00007fabd80cfc70 RDI: 0000000000000021
RBP: 00007fabd73c5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fabd73c6038 R14: 00007ffdccf0dfd0 R15: 00007ffdccf0e0b8
 </TASK>