rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P2809/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=253313, q=182 ncpus=2)
task:kworker/u4:0    state:R  running task     stack:24864 pid:2809  tgid:2809  ppid:2      flags:0x00004000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 preempt_schedule_irq+0x52/0x90 kernel/sched/core.c:7008
 irqentry_exit+0x36/0x80 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:batadv_iv_ogm_schedule_buff+0xc41/0x14f0 net/batman-adv/bat_iv_ogm.c:843
Code: 85 4f 08 00 00 48 8b 1b 48 81 fb e0 92 b8 92 0f 84 dc 02 00 00 e8 1f 56 43 f7 48 8d 7b 78 48 89 f8 48 c1 e8 03 42 80 3c 30 00 <0f> 85 0b 08 00 00 41 80 3f 00 48 8b 6b 78 0f 85 07 08 00 00 49 3b
RSP: 0018:ffffc9000319fb88 EFLAGS: 00000246
RAX: 1ffff1100414990f RBX: ffff888020a4c800 RCX: ffffffff8a442135
RDX: ffff8880334fd940 RSI: ffffffff8a441bb1 RDI: ffff888020a4c878
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000003 R12: 0000000000000050
R13: ffff8880209ba800 R14: dffffc0000000000 R15: ffffed100413750f
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:868 [inline]
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:861 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x31e/0x8c0 net/batman-adv/bat_iv_ogm.c:1712
 process_one_work+0x886/0x15d0 kernel/workqueue.c:2627
 process_scheduled_works kernel/workqueue.c:2700 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2781
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
rcu: rcu_preempt kthread starved for 10527 jiffies! g253313 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:27792 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 schedule_timeout+0x137/0x290 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x1ec/0xb10 kernel/rcu/tree.c:1631
 rcu_gp_kthread+0x24b/0x380 kernel/rcu/tree.c:1830
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </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: 6516 Comm: syz-executor.1 Not tainted 6.7.0-rc6-syzkaller-00248-g5254c0cbc92d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:xrstor_from_user_sigframe arch/x86/kernel/fpu/xstate.h:298 [inline]
RIP: 0010:__restore_fpregs_from_user arch/x86/kernel/fpu/signal.c:259 [inline]
RIP: 0010:restore_fpregs_from_user arch/x86/kernel/fpu/signal.c:288 [inline]
RIP: 0010:__fpu_restore_sig+0x454/0x1390 arch/x86/kernel/fpu/signal.c:361
Code: 0e 00 00 48 8b b8 10 19 00 00 ba 01 00 00 00 48 8b 74 24 10 e8 cd 3e 00 00 0f 01 cb 48 8b 3c 24 89 ea 8b 44 24 30 48 0f ae 2f <31> c0 89 c5 0f 01 ca e8 60 70 56 00 31 ff 89 ee e8 c7 6b 56 00 85
RSP: 0018:ffffc9000fec7b18 EFLAGS: 00040246
RAX: 0000000000000007 RBX: ffff888086d49dc0 RCX: ffffc9000be90000
RDX: 0000000000000000 RSI: ffffffff81310153 RDI: 00007f1b79ddccc0
RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888086d4b52c R14: 0000000000000007 R15: ffffed1010da96da
FS:  00007f1b79ddd6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1b79ddcec0 CR3: 000000009448f000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 fpu__restore_sig+0x103/0x180 arch/x86/kernel/fpu/signal.c:496
 restore_sigcontext+0x4c5/0x690 arch/x86/kernel/signal_64.c:95
 __do_sys_rt_sigreturn+0x139/0x230 arch/x86/kernel/signal_64.c:263
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7ffffb1f2a81
Code: 8b 12 39 d7 75 9e 48 d3 e8 48 3d ff c9 9a 3b 76 16 31 d2 48 2d 00 ca 9a 3b 83 c2 01 48 3d ff c9 9a 3b 77 ef 49 01 d0 4c 89 06 <48> 89 46 08 48 83 c4 08 31 c0 5b 41 5c 5d c3 83 f8 02 74 42 b8 e4
RSP: 002b:00007f1b79ddd0b8 EFLAGS: 00000283
RAX: 00000000167bf26f RBX: 0000000000000000 RCX: 0000000000000018
RDX: 00000000000a698c RSI: 00007f1b79ddd140 RDI: 00000000000a698c
RBP: 00007f1b79ddd0d0 R08: 0000000000000d7b R09: 0000000000000001
R10: 00007ffffb1ee080 R11: 0000000001e1d8ef R12: 0000000000000000
R13: 000000000000006e R14: 00007f1b7b39c120 R15: 00007ffffb1a0178
 </TASK>