rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P50/1:b..l P8348/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=24077, q=114 ncpus=2)
task:syz-executor.5  state:R  running task     stack:26832 pid:8348  tgid:8348  ppid:5099   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0xf15/0x5ce0 kernel/sched/core.c:6727
 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6906
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 zap_pte_range mm/memory.c:1652 [inline]
 zap_pmd_range mm/memory.c:1700 [inline]
 zap_pud_range mm/memory.c:1729 [inline]
 zap_p4d_range mm/memory.c:1750 [inline]
 unmap_page_range+0x115d/0x2de0 mm/memory.c:1771
 unmap_single_vma+0x194/0x2b0 mm/memory.c:1817
 unmap_vmas+0x22f/0x490 mm/memory.c:1861
 exit_mmap+0x1c1/0xbe0 mm/mmap.c:3260
 __mmput+0x12a/0x4d0 kernel/fork.c:1343
 mmput+0x62/0x70 kernel/fork.c:1365
 exit_mm kernel/exit.c:569 [inline]
 do_exit+0x999/0x2ac0 kernel/exit.c:858
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1020
 __do_sys_exit_group kernel/exit.c:1031 [inline]
 __se_sys_exit_group kernel/exit.c:1029 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1029
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7fc10647cda9
RSP: 002b:00007ffde1175bb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007fc10647cda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000008 R09: 0000000000000000
R10: 0000001b31920000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
task:kworker/u4:3    state:R  running task     stack:25600 pid:50    tgid:50    ppid:2      flags:0x00004000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0xf15/0x5ce0 kernel/sched/core.c:6727
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7049
 irqentry_exit+0x36/0x90 kernel/entry/common.c:348
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:654
RIP: 0010:lock_acquire+0x1f2/0x540 kernel/locking/lockdep.c:5722
Code: c1 05 2a e6 96 7e 83 f8 01 0f 85 c8 02 00 00 9c 58 f6 c4 02 0f 85 b3 02 00 00 48 85 ed 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:ffffc90000bb7a88 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92000176f53 RCX: 0000000020928b20
RDX: 0000000000000001 RSI: ffffffff8aecc120 RDI: ffffffff8b4ec1c0
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff275c5f8
R10: ffffffff93ae2fc7 R11: 0000000000000003 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8d5b08e0 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 rcu_read_lock include/linux/rcupdate.h:750 [inline]
 batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:754 [inline]
 batadv_iv_ogm_schedule_buff+0x5ac/0x1500 net/batman-adv/bat_iv_ogm.c:825
 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/0x8d0 net/batman-adv/bat_iv_ogm.c:1712
 process_one_work+0x8d5/0x16e0 kernel/workqueue.c:2633
 process_scheduled_works kernel/workqueue.c:2707 [inline]
 worker_thread+0x8b6/0x1290 kernel/workqueue.c:2788
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242
 </TASK>
rcu: rcu_preempt kthread starved for 10455 jiffies! g24077 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:28160 pid:16    tgid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0xf15/0x5ce0 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6804 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6819
 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2183
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:1663
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:1862
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242
 </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: 8351 Comm: syz-executor.2 Not tainted 6.8.0-rc1-next-20240125-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:rcu_is_watching+0x5/0xc0 kernel/rcu/tree.c:696
Code: e8 80 62 46 09 65 8a 05 75 0c 90 7e 0f b6 c0 c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <53> 65 ff 05 ab f1 8f 7e e8 1e 62 46 09 48 c7 c3 a8 6d 03 00 83 f8
RSP: 0018:ffffc90000007cd0 EFLAGS: 00000046
RAX: 0000000080010003 RBX: 0000000000000001 RCX: ffffffff815481c1
RDX: ffff88804d31da00 RSI: ffffffff81548304 RDI: 0000000000000005
RBP: ffff88802a42a500 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000003 R12: ffffc90000007d70
R13: ffff88802a42a500 R14: ffffed1009a63c62 R15: ffff88804d31e310
FS:  00007f0d3e7506c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002006b000 CR3: 000000002300a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 rcu_read_unlock include/linux/rcupdate.h:779 [inline]
 __lock_task_sighand+0x269/0x340 kernel/signal.c:1418
 lock_task_sighand include/linux/sched/signal.h:748 [inline]
 send_sigqueue+0x1d4/0x850 kernel/signal.c:1987
 posix_timer_event kernel/time/posix-timers.c:298 [inline]
 posix_timer_fn+0x181/0x3e0 kernel/time/posix-timers.c:324
 __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 __hrtimer_run_queues+0x20c/0xc20 kernel/time/hrtimer.c:1753
 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1815
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x410 arch/x86/kernel/apic/apic.c:1082
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 90 f3 0f 1e fa 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 6a dd ad f6 48 89 df e8 d2 58 ae f6 e8 dd 98 d5 f6 fb bf 01 00 00 00 <e8> b2 9f 9f f6 65 8b 05 f3 09 46 75 85 c0 74 06 5b c3 cc cc cc cc
RSP: 0018:ffffc9001453fcf8 EFLAGS: 00000206
RAX: 0000000003a23a9f RBX: ffff88802a42a500 RCX: 1ffffffff1ef3de1
RDX: 0000000000000000 RSI: ffffffff8aecbe20 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8f7a2197 R11: 0000000000000000 R12: ffff88802a42a998
R13: 0000000000000021 R14: ffff88802a42a900 R15: 1ffff920028a7fae
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x187d/0x2760 kernel/signal.c:2896
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0x153/0x2b0 kernel/entry/common.c:212
 do_syscall_64+0xe2/0x260 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f0d3da7cda7
Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89
RSP: 002b:00007f0d3e7500c8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f0d3dbabf80 RCX: 00007f0d3da7cda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f0d3dac947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f0d3dbabf80 R15: 00007fff935baa28
 </TASK>