rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P15561/1:b..l P16550/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=175157, q=529 ncpus=2)
task:syz.3.1619      state:R  running task     stack:23920 pid:16550 tgid:16538 ppid:15880  flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_release+0x658/0xa30 kernel/locking/lockdep.c:5784
Code: 3c 3b 00 74 08 4c 89 f7 e8 65 db 8a 00 f6 84 24 91 00 00 00 02 75 77 41 f7 c5 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 27 00 00 00 00 4b c7 44 27 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc90003cef500 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff9200079deb2 RCX: ffffc90003cef503
RDX: 0000000000000002 RSI: ffffffff8c0ae6c0 RDI: ffffffff8c608f00
RBP: ffffc90003cef630 R08: ffffffff9018766f R09: 1ffffffff2030ecd
R10: dffffc0000000000 R11: fffffbfff2030ece R12: 1ffff9200079deac
R13: 0000000000000246 R14: ffffc90003cef590 R15: dffffc0000000000
 rcu_lock_release include/linux/rcupdate.h:336 [inline]
 rcu_read_unlock include/linux/rcupdate.h:869 [inline]
 filemap_get_entry+0x323/0x3b0 mm/filemap.c:1858
 shmem_get_folio_gfp+0x29a/0x2370 mm/shmem.c:2104
 shmem_get_folio mm/shmem.c:2293 [inline]
 shmem_write_begin+0x170/0x4d0 mm/shmem.c:2898
 generic_perform_write+0x39b/0x840 mm/filemap.c:4019
 shmem_file_write_iter+0xfc/0x120 mm/shmem.c:3074
 do_iter_readv_writev+0x60c/0x890
 vfs_writev+0x37c/0xbb0 fs/read_write.c:971
 do_pwritev fs/read_write.c:1072 [inline]
 __do_sys_pwritev2 fs/read_write.c:1131 [inline]
 __se_sys_pwritev2+0x1ca/0x2d0 fs/read_write.c:1122
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f833277def9
RSP: 002b:00007f833360d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007f8332936058 RCX: 00007f833277def9
RDX: 0000000000000001 RSI: 0000000020000240 RDI: 0000000000000005
RBP: 00007f83327f0b76 R08: 0000000000000000 R09: 0000000000000003
R10: 0000000000007c00 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8332936058 R15: 00007ffef9f1ff78
 </TASK>
task:kworker/u8:5    state:R  running task     stack:18576 pid:15561 tgid:15561 ppid:2      flags:0x00004000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:867 [inline]
RIP: 0010:batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:771 [inline]
RIP: 0010:batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:825 [inline]
RIP: 0010:batadv_iv_ogm_schedule+0x66f/0x10a0 net/batman-adv/bat_iv_ogm.c:868
Code: fe ff ff e8 f3 b6 14 f6 eb 05 e8 ec b6 14 f6 e8 67 db 3a 00 89 c3 31 ff 89 c6 e8 1c bb 14 f6 85 db 74 15 e8 03 ed fa f5 84 c0 <74> 18 e8 ca b6 14 f6 4c 8b 6c 24 28 eb 65 e8 be b6 14 f6 4c 8b 6c
RSP: 0018:ffffc9000345f9c0 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffff8880304e8000
RDX: ffff8880304e8000 RSI: ffffffff8c608ee0 RDI: ffffffff8c608ea0
RBP: ffffc9000345faf8 R08: ffffffff8b7ed5d4 R09: 1ffffffff283c908
R10: dffffc0000000000 R11: fffffbfff283c909 R12: ffff88806c3de000
R13: ffff88807dd59a80 R14: dffffc0000000000 R15: ffff88807dfe9750
 batadv_iv_send_outstanding_bat_ogm_packet+0x6fe/0x810 net/batman-adv/bat_iv_ogm.c:1712
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3312
 worker_thread+0x870/0xd30 kernel/workqueue.c:3393
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>