rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 GPs behind) idle=1e94/1/0x4000000000000000 softirq=19845/19846 fqs=1
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5835/1:b..l
rcu: (detected by 1, t=10505 jiffies, g=14889, q=217 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 3968 Comm: kworker/u8:8 Not tainted 6.14.0-rc5-syzkaller-00016-g48a5eed9ad58 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: bat_events batadv_nc_worker
RIP: 0010:debug_objects_fill_pool+0x1f/0x510 lib/debugobjects.c:698
Code: 90 90 90 90 90 90 90 90 90 90 90 48 b8 00 00 00 00 00 fc ff df 41 56 41 55 41 54 55 53 48 83 ec 68 48 c7 44 24 08 b3 8a b5 41 <48> 8d 5c 24 08 48 c7 44 24 10 c1 da 9d 8d 48 c1 eb 03 48 c7 44 24
RSP: 0018:ffffc90000007c68 EFLAGS: 00000092
RAX: dffffc0000000000 RBX: ffff8880b862c780 RCX: ffffffff81a71136
RDX: ffff888034a04880 RSI: ffffffff8b6fbca0 RDI: ffff8880617ae340
RBP: ffffc90000007df0 R08: 0000000000000001 R09: ffffc90000007d20
R10: 0000000000000000 R11: 0000000000000003 R12: dffffc0000000000
R13: ffff8880617ae340 R14: 1ffff92000000fa4 R15: ffffffff896a93a0
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe5e54d56c0 CR3: 0000000037092000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
debug_object_activate+0x10d/0x4a0 lib/debugobjects.c:814
debug_hrtimer_activate kernel/time/hrtimer.c:455 [inline]
debug_activate kernel/time/hrtimer.c:496 [inline]
enqueue_hrtimer+0x25/0x3c0 kernel/time/hrtimer.c:1100
__run_hrtimer kernel/time/hrtimer.c:1818 [inline]
__hrtimer_run_queues+0x903/0xae0 kernel/time/hrtimer.c:1865
hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1927
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:debug_lockdep_rcu_enabled+0x14/0x40 kernel/rcu/update.c:320
Code: 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 8b 05 e2 25 0b 05 85 c0 74 20 8b 05 20 58 0b 05 <85> c0 74 16 65 48 8b 05 20 a2 ac 74 8b 80 ec 0a 00 00 85 c0 0f 94
RSP: 0018:ffffc9000e7e7b18 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff88805f275c48 RCX: 00000000fba079c6
RDX: 0000000000000001 RSI: ffffffff8b6cf100 RDI: ffffffff8bd35aa0
RBP: 0000000000000389 R08: 0000000000000000 R09: fffffbfff2dd8598
R10: ffffffff96ec2cc7 R11: 0000000000000002 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000000 R15: dffffc0000000000
rcu_read_lock include/linux/rcupdate.h:850 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0x16f/0x1060 net/batman-adv/network-coding.c:719
process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400
kthread+0x3af/0x750 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
task:syz-executor state:R running task stack:23360 pid:5835 tgid:5835 ppid:5811 task_flags:0x400140 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0xf43/0x5890 kernel/sched/core.c:6765
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6944
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
copy_pte_range mm/memory.c:1201 [inline]
copy_pmd_range mm/memory.c:1262 [inline]
copy_pud_range mm/memory.c:1299 [inline]
copy_p4d_range mm/memory.c:1323 [inline]
copy_page_range+0x1e7f/0x5690 mm/memory.c:1421
dup_mmap kernel/fork.c:748 [inline]
dup_mm kernel/fork.c:1700 [inline]
copy_mm kernel/fork.c:1752 [inline]
copy_process+0x7ccb/0x8c50 kernel/fork.c:2403
kernel_clone+0xfd/0x960 kernel/fork.c:2815
__do_sys_clone+0xcf/0x120 kernel/fork.c:2958
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe5e47839d3
RSP: 002b:00007ffd228f3728 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe5e47839d3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 000055557eefd7d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 0000000000019fad R15: 00007ffd228f38c0
rcu: rcu_preempt kthread starved for 10500 jiffies! g14889 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:27552 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0xf43/0x5890 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6857
schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2024
rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2226
kthread+0x3af/0x750 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 1308 Comm: kworker/u8:5 Not tainted 6.14.0-rc5-syzkaller-00016-g48a5eed9ad58 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x4c6/0x12c0 kernel/smp.c:885
Code: 0c 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 fc 4c 89 fd 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 7c 0e 0c 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 e8 0b 00 00 8b 43 08 31
RSP: 0018:ffffc90004fef928 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b8646a00 RCX: ffffffff81add36a
RDX: ffff888028d98000 RSI: ffffffff81add344 RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000006 R12: ffffed10170c8d41
R13: 0000000000000001 R14: ffff8880b873fe80 R15: ffff8880b8646a08
FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb1f2276f98 CR3: 000000000df80000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1052
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:2118 [inline]
text_poke_bp_batch+0x22b/0x760 arch/x86/kernel/alternative.c:2328
text_poke_flush arch/x86/kernel/alternative.c:2519 [inline]
text_poke_flush arch/x86/kernel/alternative.c:2516 [inline]
text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2526
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
jump_label_update+0x1d7/0x400 kernel/jump_label.c:920
static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:210
static_key_enable+0x1a/0x20 kernel/jump_label.c:223
toggle_allocation_gate mm/kfence/core.c:850 [inline]
toggle_allocation_gate+0xfc/0x260 mm/kfence/core.c:842
process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400
kthread+0x3af/0x750 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244