rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P12902/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=56093, q=298 ncpus=2)
task:syz.3.1927 state:R running task stack:23664 pid:12902 tgid:12898 ppid:5842 task_flags:0x400140 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7108
irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:folio_batch_add include/linux/pagevec.h:-1 [inline]
RIP: 0010:find_lock_entries+0x401/0xa60 mm/filemap.c:2163
Code: 4d 89 26 44 0f b6 32 45 8d 66 01 44 88 22 bf 1f 00 00 00 44 89 f6 e8 1e b0 c8 ff 41 83 fe 1e 0f 87 11 04 00 00 e8 0f ad c8 ff <48> 8b 44 24 70 4e 8d 34 f0 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 74
RSP: 0018:ffffc90003407540 EFLAGS: 00000246
RAX: ffffffff81f79621 RBX: ffffc900034079e0 RCX: 0000000000080000
RDX: ffffc9000f833000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90003407690 R08: ffffea00013fca07 R09: 1ffffd400027f940
R10: dffffc0000000000 R11: fffff9400027f941 R12: 0000000000000005
R13: dffffc0000000000 R14: 0000000000000004 R15: 1ffff92000680eec
shmem_undo_range+0x254/0x14b0 mm/shmem.c:1107
shmem_truncate_range mm/shmem.c:1237 [inline]
shmem_evict_inode+0x272/0xa70 mm/shmem.c:1365
evict+0x501/0x9c0 fs/inode.c:810
__dentry_kill+0x209/0x660 fs/dcache.c:669
dput+0x19f/0x2b0 fs/dcache.c:911
__fput+0x68e/0xa70 fs/file_table.c:475
task_work_run+0x1d4/0x260 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:114
exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff83898e969
RSP: 002b:00007ff839887038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: 0000200000000000 RBX: 00007ff838bb6160 RCX: 00007ff83898e969
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007ff838a10ab1 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff838bb6160 R15: 00007ffcf30fc608
rcu: rcu_preempt kthread timer wakeup didn't happen for 10500 jiffies! g56093 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=62252
rcu: rcu_preempt kthread starved for 10501 jiffies! g56093 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27128 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 61 Comm: kworker/u8:5 Not tainted 6.15.0-rc7-next-20250523-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: bat_events batadv_nc_worker
RIP: 0010:preempt_count_add+0x61/0x1a0 kernel/sched/core.c:5874
Code: 45 de 0b 11 65 01 3d 3e de 0b 11 48 c7 c0 20 f3 a7 99 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 ec 00 00 00 83 3d 0f 31 17 18 00 <75> 11 65 8b 05 16 de 0b 11 0f b6 c0 3d f5 00 00 00 73 5e 65 8b 05
RSP: 0018:ffffc90000a08be0 EFLAGS: 00000046
RAX: 0000000000000004 RBX: ffffffff99c54e20 RCX: ffffffff99a7f303
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc90000a08c98 R08: ffffc90000a08cbf R09: 0000000000000000
R10: ffffc90000a08cb0 R11: fffff52000141198 R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000802 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff888125d56000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c28fe73 CR3: 000000002eedc000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:109 [inline]
_raw_spin_lock_irqsave+0x8c/0xf0 kernel/locking/spinlock.c:162
debug_object_deactivate+0x9a/0x250 lib/debugobjects.c:873
debug_hrtimer_deactivate kernel/time/hrtimer.c:450 [inline]
debug_deactivate+0x1d/0x200 kernel/time/hrtimer.c:490
__run_hrtimer kernel/time/hrtimer.c:1729 [inline]
__hrtimer_run_queues+0x2b0/0xc60 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:should_resched arch/x86/include/asm/preempt.h:104 [inline]
RIP: 0010:__local_bh_enable_ip+0x135/0x1c0 kernel/softirq.c:414
Code: 8b e8 bf 02 df 09 65 66 8b 05 4f 0f 17 11 66 85 c0 75 5a bf 01 00 00 00 e8 68 32 0b 00 e8 03 36 42 00 fb 65 8b 05 2b 0f 17 11 <85> c0 75 05 e8 82 05 ae ff 48 c7 04 24 0e 36 e0 45 4b c7 04 37 00
RSP: 0018:ffffc9000212f8e0 EFLAGS: 00000282
RAX: 0000000080000000 RBX: 0000000000000201 RCX: fac02e7312eeb900
RDX: 0000000000000006 RSI: ffffffff8d97e74b RDI: ffffffff8be29300
RBP: ffffc9000212f978 R08: ffffffff8fa12ef7 R09: 1ffffffff1f425de
R10: dffffc0000000000 R11: fffffbfff1f425df R12: ffffffff8b32a4e8
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff92000425f1c
spin_unlock_bh include/linux/spinlock.h:396 [inline]
batadv_nc_purge_paths+0x318/0x3b0 net/batman-adv/network-coding.c:471
batadv_nc_worker+0x328/0x610 net/batman-adv/network-coding.c:720
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245