rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P952/1:b..l P7799/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=26309, q=333 ncpus=2)
task:syz.1.602       state:R  running task     stack:23792 pid:7799  tgid:7797  ppid:6132   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067
 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:blk_cgroup_congested+0x115/0x220 block/blk-cgroup.c:2190
Code: 41 bf 62 fd 48 8b 5d 00 4c 01 e3 48 89 df be 04 00 00 00 e8 9d c1 62 fd 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 3c 8b 1b <31> ff 89 de e8 f2 0d fd fc 85 db 75 4c 48 81 c5 10 01 00 00 48 89
RSP: 0018:ffffc90014f8eff0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff84992073
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88807e9c4a50
RBP: ffffffff9494f8e0 R08: ffff88807e9c4a53 R09: 1ffff1100fd3894a
R10: dffffc0000000000 R11: ffffed100fd3894b R12: 0000000000000a10
R13: 000000ffffffffff R14: ffffffff84991f8d R15: dffffc0000000000
 __folio_throttle_swaprate+0x84/0x1d0 mm/swapfile.c:3695
 folio_throttle_swaprate include/linux/swap.h:632 [inline]
 folio_prealloc+0x10a/0x170 mm/memory.c:1060
 wp_page_copy mm/memory.c:3285 [inline]
 do_wp_page+0x11cc/0x52f0 mm/memory.c:3677
 handle_pte_fault+0x117e/0x7090 mm/memory.c:5397
 __handle_mm_fault mm/memory.c:5524 [inline]
 handle_mm_fault+0x10df/0x1ba0 mm/memory.c:5689
 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline]
RIP: 0010:raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline]
RIP: 0010:copy_to_user_iter lib/iov_iter.c:25 [inline]
RIP: 0010:iterate_iovec include/linux/iov_iter.h:51 [inline]
RIP: 0010:iterate_and_advance2 include/linux/iov_iter.h:247 [inline]
RIP: 0010:iterate_and_advance include/linux/iov_iter.h:271 [inline]
RIP: 0010:_copy_to_iter+0x4bb/0x1960 lib/iov_iter.c:185
Code: b6 e9 fc 48 8b 44 24 78 48 8b 4c 24 38 4c 8d 3c 08 4c 89 ff 44 89 f6 e8 13 6e 4f fd 0f 01 cb 4c 89 f1 4c 89 fe 48 8b 7c 24 40 <f3> a4 0f 1f 00 0f 01 ca 48 8b 5c 24 50 4c 8b 7c 24 48 49 29 ce 4c
RSP: 0018:ffffc90014f8f960 EFLAGS: 00050246
RAX: ffff888012978001 RBX: 000000002014be80 RCX: 0000000000000e80
RDX: 0000000000000000 RSI: ffff888012978180 RDI: 000000002014b000
RBP: ffffc90014f8fad8 R08: ffff888012978fff R09: 1ffff1100252f1ff
R10: dffffc0000000000 R11: ffffed100252f200 R12: dffffc0000000000
R13: 1ffff920029f1f40 R14: 0000000000001000 R15: ffff888012978000
 copy_page_to_iter+0xb1/0x160 lib/iov_iter.c:362
 process_vm_rw_pages mm/process_vm_access.c:45 [inline]
 process_vm_rw_single_vec mm/process_vm_access.c:118 [inline]
 process_vm_rw_core mm/process_vm_access.c:216 [inline]
 process_vm_rw+0x871/0xcf0 mm/process_vm_access.c:284
 __do_sys_process_vm_readv mm/process_vm_access.c:296 [inline]
 __se_sys_process_vm_readv mm/process_vm_access.c:292 [inline]
 __x64_sys_process_vm_readv+0xe0/0x100 mm/process_vm_access.c:292
 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: 0033:0x7fb68dd75b99
RSP: 002b:00007fb68ea97048 EFLAGS: 00000246 ORIG_RAX: 0000000000000136
RAX: ffffffffffffffda RBX: 00007fb68df04078 RCX: 00007fb68dd75b99
RDX: 0000000000000002 RSI: 0000000020008400 RDI: 00000000000000aa
RBP: 00007fb68ddf677e R08: 0000000000000286 R09: 0000000000000000
R10: 0000000020008640 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fb68df04078 R15: 00007fff80045ca8
 </TASK>
task:kworker/u8:5    state:R  running task     stack:21104 pid:952   tgid:952   ppid:2      flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067
 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_acquire+0x264/0x550 kernel/locking/lockdep.c:5758
Code: 2b 00 74 08 4c 89 f7 e8 7a 76 89 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc900041b79e0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92000836f48 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8bcaccc0 RDI: ffffffff8c1feb40
RBP: ffffc900041b7b40 R08: ffffffff92fa8587 R09: 1ffffffff25f50b0
R10: dffffc0000000000 R11: fffffbfff25f50b1 R12: 1ffff92000836f44
R13: dffffc0000000000 R14: ffffc900041b7a40 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 rcu_read_lock include/linux/rcupdate.h:781 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
 batadv_nc_worker+0xec/0x610 net/batman-adv/network-coding.c:719
 process_one_work kernel/workqueue.c:3248 [inline]
 process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3329
 worker_thread+0x86d/0xd50 kernel/workqueue.c:3409
 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>
rcu: rcu_preempt kthread starved for 10396 jiffies! g26309 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:25560 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
 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>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.10.0-rc5-syzkaller-00282-g8282d5af7be8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:72 [inline]
RIP: 0010:acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:113
Code: 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 c0 d4 03 00 48 f7 00 08 00 00 00 75 10 eb 07 0f 00 2d b5 5c a3 00 f3 0f 1e fa fb f4 <fa> e9 f4 23 2a 00 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffc900001a7d08 EFLAGS: 00000246
RAX: ffff8880176e0000 RBX: ffff88801ce88864 RCX: 00000000001bb939
RDX: 0000000000000001 RSI: ffff88801ce88800 RDI: ffff88801ce88864
RBP: 000000000003a578 R08: ffff8880b9537ccb R09: 1ffff110172a6f99
R10: dffffc0000000000 R11: ffffffff8b8618c0 R12: ffff88801cbd0000
R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8eacde80
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feb836c9c09 CR3: 000000004cb52000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:707
 cpuidle_enter_state+0x114/0x480 drivers/cpuidle/cpuidle.c:267
 cpuidle_enter+0x5d/0xa0 drivers/cpuidle/cpuidle.c:388
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:236 [inline]
 do_idle+0x375/0x5d0 kernel/sched/idle.c:332
 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:430
 start_secondary+0x100/0x100 arch/x86/kernel/smpboot.c:313
 common_startup_64+0x13e/0x147
 </TASK>