rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P16169/1:b..l P56/1:b..l
(detected by 1, t=10502 jiffies, g=93213, q=46 ncpus=2)
task:kworker/u4:4 state:R running task stack:21920 pid:56 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_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
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:ffffc90001577ac0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 8cf2fe635c31d700
RDX: 0000000000000000 RSI: ffffffff8a8c15e0 RDI: ffffffff8adf1c20
RBP: ffffc90001577bc8 R08: dffffc0000000000 R09: fffffbfff215c449
R10: fffffbfff215c449 R11: 1ffffffff215c448 R12: 0000000000000001
R13: 1ffff920002aef64 R14: 0000000000000246 R15: dffffc0000000000
rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock include/linux/rcupdate.h:791 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0xeb/0x600 net/batman-adv/network-coding.c:719
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
task:syz.8.2861 state:R running task stack:25152 pid:16169 ppid:13263 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:mas_validate_limits lib/maple_tree.c:7117 [inline]
RIP: 0010:mt_validate+0x1a82/0x4c90 lib/maple_tree.c:7239
Code: 41 38 df 4c 8d bc 24 48 01 00 00 4c 0f 47 7c 24 28 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8 b1 d0 cc f7 4d 8b 3f <31> ff 4c 89 fe e8 d4 58 7b f7 4d 85 ff 41 0f 95 c6 31 ff 48 89 de
RSP: 0018:ffffc9000c7873c0 EFLAGS: 00000246
RAX: 1ffff1100c2a9dc1 RBX: 0000000000000000 RCX: 0000000000000002
RDX: ffff88802b0d0000 RSI: 0000000000000000 RDI: 000000000000000f
RBP: ffffc9000c787590 R08: ffff88802b0d0000 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000002 R12: dffffc0000000000
R13: ffff88806154ee80 R14: 0000000000000001 R15: 000000110c22ffff
validate_mm_mt+0xcd/0x420 mm/mmap.c:294
validate_mm+0xcc/0x2b0 mm/mmap.c:331
do_mas_align_munmap+0xfad/0x1220 mm/mmap.c:2595
do_mas_munmap+0x240/0x2b0 mm/mmap.c:2646
__mmap_region mm/mmap.c:2694 [inline]
mmap_region+0x713/0x1d30 mm/mmap.c:2912
do_mmap+0x894/0xf30 mm/mmap.c:1432
vm_mmap_pgoff+0x1b2/0x2b0 mm/util.c:520
ksys_mmap_pgoff+0x516/0x6f0 mm/mmap.c:1478
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: 0033:0x7fa14498e929
RSP: 002b:00007fa145883038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fa144bb6080 RCX: 00007fa14498e929
RDX: 0000000000000001 RSI: 0000000000003000 RDI: 0000200000ffd000
RBP: 00007fa144a10ca1 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa144bb6080 R15: 00007ffef00ad978
rcu: rcu_preempt kthread starved for 10567 jiffies! g93213 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:26912 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
rcu_gp_fqs_loop+0x2f2/0x1310 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: 1 PID: 16147 Comm: syz.4.2859 Not tainted 6.1.145-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: f5 ff 0f 1f 00 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ce 81 41 f7 48 89 df e8 26 47 42 f7 e8 41 49 65 f7 fb bf 01 00 00 00 36 c4 35 f7 65 8b 05 07 85 e0 75 85 c0 74 02 5b c3 e8 54 96 de
RSP: 0018:ffffc90003317bb8 EFLAGS: 00000286
RAX: 6b2a407dacb7eb00 RBX: ffff88823bc3a000 RCX: 6b2a407dacb7eb00
RDX: dffffc0000000000 RSI: ffffffff8a8c0460 RDI: 0000000000000001
RBP: ffff88823bc3a298 R08: dffffc0000000000 R09: ffffed1047787401
R10: ffffed1047787401 R11: 1ffff11047787400 R12: 1ffff11047787453
R13: 0000000000000011 R14: dffffc0000000000 R15: 0000000000000000
FS: 00007f0462d896c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2f72ab CR3: 000000007e7e8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
spin_unlock_irq include/linux/spinlock.h:401 [inline]
get_signal+0x1163/0x1350 kernel/signal.c:2874
arch_do_signal_or_restart+0xb0/0x1230 arch/x86/kernel/signal.c:871
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: 0033:0x7f0461f8e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0462d890e8 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 00007f04621b5fa8 RCX: 00007f0461f8e929
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f04621b5fa8
RBP: 00007f04621b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f04621b5fac
R13: 0000000000000000 R14: 00007ffe8a4607c0 R15: 00007ffe8a4608a8