rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4818/1:b..l P16638/1:b..l
(detected by 0, t=10502 jiffies, g=91373, q=86 ncpus=2)
task:syz.8.3004 state:R running task stack:25248 pid:16638 ppid:9226 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:xas_start+0x184/0x770 lib/xarray.c:188
Code: ff e8 f0 40 0d 00 89 c5 31 ff 89 c6 e8 25 f8 7e f7 85 ed 0f 84 67 02 00 00 e8 b8 f4 7e f7 e9 7a 02 00 00 4c 89 f0 48 c1 e8 03 <48> bd 00 00 00 00 00 fc ff df 80 3c 28 00 74 08 4c 89 f7 e8 f4 67
RSP: 0018:ffffc90011017558 EFLAGS: 00000a02
RAX: 1ffff92002202ec8 RBX: 0000000000000003 RCX: ffff888026808000
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff2117049
R10: fffffbfff2117049 R11: 1ffffffff2117048 R12: 0000000000000003
R13: ffffc90011017658 R14: ffffc90011017640 R15: 1ffff92002202ecb
xas_load+0x28/0x140 lib/xarray.c:235
mapping_get_entry mm/filemap.c:1881 [inline]
__filemap_get_folio+0x1bb/0xdd0 mm/filemap.c:1943
shmem_get_folio_gfp+0x310/0x3400 mm/shmem.c:1881
shmem_fault+0x1be/0x7b0 mm/shmem.c:2156
__do_fault+0x13b/0x4e0 mm/memory.c:4280
do_read_fault mm/memory.c:4631 [inline]
do_fault mm/memory.c:4760 [inline]
handle_pte_fault mm/memory.c:5031 [inline]
__handle_mm_fault mm/memory.c:5173 [inline]
handle_mm_fault+0x28ca/0x3e70 mm/memory.c:5294
faultin_page mm/gup.c:1026 [inline]
__get_user_pages+0x3ff/0xeb0 mm/gup.c:1250
populate_vma_page_range+0x214/0x2b0 mm/gup.c:1607
__mm_populate+0x248/0x370 mm/gup.c:1721
mm_populate include/linux/mm.h:2823 [inline]
vm_mmap_pgoff+0x203/0x2b0 mm/util.c:525
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb6d798e969
RSP: 002b:00007fb6d87df038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fb6d7bb5fa0 RCX: 00007fb6d798e969
RDX: b635773f06ebbeef RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007fb6d7a10ab1 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb6d7bb5fa0 R15: 00007ffe5b14da18
task:kworker/u4:13 state:R running task stack:22344 pid:4818 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lock_acquire+0x20f/0x490 kernel/locking/lockdep.c:5666
Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f5 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 66 43 c7 44 3d 09 00 00 43 c6 44 3d 0b
RSP: 0018:ffffc9000c5dfa40 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 78c846529806d400
RDX: 0000000000000000 RSI: ffffffff8a6c1180 RDI: ffffffff8abf1020
RBP: ffffc9000c5dfb58 R08: dffffc0000000000 R09: fffffbfff2117049
R10: fffffbfff2117049 R11: 1ffffffff2117048 R12: 0000000000000001
R13: 1ffff920018bbf54 R14: 0000000000000246 R15: dffffc0000000000
rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock include/linux/rcupdate.h:791 [inline]
batadv_nc_process_nc_paths+0xdb/0x390 net/batman-adv/network-coding.c:687
batadv_nc_worker+0x425/0x600 net/batman-adv/network-coding.c:728
process_one_work+0x898/0x1160 kernel/workqueue.c:2292
worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: rcu_preempt kthread starved for 10560 jiffies! g91373 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:27840 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0010:prepare_to_swait_event+0x0/0x350 kernel/sched/swait.c:103
Code: 75 18 48 8b 7c 24 10 48 8b 74 24 20 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d e9 eb 04 b9 08 0f 0b eb 99 0f 1f 80 00 00 00 00 <55> 41 57 41 56 41 55 41 54 53 48 83 ec 28 89 d3 49 89 f7 48 89 fd
RSP: 0018:ffffc90000157cb8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88813fe6d940
RDX: 0000000000000402 RSI: ffffc90000157d80 RDI: ffffffff8c9305d8
RBP: ffffc90000157e10 R08: dffffc0000000000 R09: ffffc90000157a60
R10: fffff5200002af5c R11: 1ffff9200002af4c R12: 0000000000000040
R13: ffffffff8c930580 R14: ffffc90000157d88 R15: 0000000000000000
rcu_gp_fqs_loop+0x2bd/0x1310 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 16645 Comm: syz.5.3003 Not tainted 6.1.139-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:signal_setup_done+0x0/0x440 kernel/signal.c:2915
Code: ff ff 89 da 80 e2 07 80 c2 03 38 ca 0f 8c 17 fd ff ff 48 89 df 89 c5 e8 3e 61 81 00 89 e8 e9 06 fd ff ff 0f 1f 80 00 00 00 00 <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec 20 01
RSP: 0018:ffffc90003067cb8 EFLAGS: 00000246
RAX: 4f23e25aa90ce400 RBX: dffffc0000000000 RCX: 4f23e25aa90ce400
RDX: 0000000000000000 RSI: ffffc90003067de0 RDI: 0000000000000000
RBP: ffffc90003067ec0 R08: dffffc0000000000 R09: ffffed102802f381
R10: ffffed102802f381 R11: 1ffff1102802f380 R12: 0000000000000000
R13: 1ffff9200060cfff R14: ffffc90003067fe8 R15: ffff88807b4636c0
FS: 00007f1d110e76c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efd53925b40 CR3: 000000001e335000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
handle_signal arch/x86/kernel/signal.c:846 [inline]
arch_do_signal_or_restart+0xeba/0x1230 arch/x86/kernel/signal.c:873
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1d1004d980
Code: 44 24 20 0f 29 44 24 30 0f 29 44 24 40 48 8b 44 24 08 ff d0 48 83 c4 50 31 c0 5b 5d 41 5c 41 5d 41 5e c3 0f 1f 80 00 00 00 00 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 c3 66 66 2e 0f 1f
RSP: 002b:00007f1d110e6b38 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f1d103b5fa8 RCX: 00007f1d1018e969
RDX: 00007f1d110e6b40 RSI: 00007f1d110e6c70 RDI: 0000000000000011
RBP: 00007f1d103b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1d103b5fac
R13: 0000000000000000 R14: 00007fff059b5d30 R15: 00007fff059b5e18