rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4508/1:b..l
(detected by 1, t=10502 jiffies, g=21409, q=46 ncpus=2)
task:kworker/u4:15 state:R running task stack:23104 pid:4508 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 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:trace_lock_acquire include/trace/events/lock.h:24 [inline]
RIP: 0010:lock_acquire+0xe1/0x490 kernel/locking/lockdep.c:5633
Code: 74 bc 0c 0f 83 8c 01 00 00 45 89 f4 41 c1 ee 06 4a 8d 3c f5 a8 6a 1f 8e be 08 00 00 00 e8 77 0e 6e 00 4c 0f a3 25 27 72 bc 0c <73> 0d e8 f8 1b 08 00 84 c0 0f 84 18 02 00 00 48 c7 c0 64 9f 1f 8e
RSP: 0018:ffffc90004ff7ac0 EFLAGS: 00000257
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff8162f879
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8e1f6aa8
RBP: ffffc90004ff7bc8 R08: dffffc0000000000 R09: fffffbfff1c3ed56
R10: fffffbfff1c3ed56 R11: 1ffffffff1c3ed55 R12: 0000000000000000
R13: 1ffff920009fef64 R14: 0000000000000000 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
rcu: rcu_preempt kthread timer wakeup didn't happen for 10522 jiffies! g21409 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=9875
rcu: rcu_preempt kthread starved for 10528 jiffies! g21409 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27840 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
schedule_timeout+0x15c/0x280 kernel/time/timer.c:2167
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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6035 Comm: syz.5.271 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:360 [inline]
RIP: 0010:unwind_next_frame+0xb1c/0x20b0 arch/x86/kernel/unwind_orc.c:539
Code: 4c 39 f8 0f 96 c0 20 c8 3c 01 0f 85 9f 0d 00 00 48 89 ef e8 16 1f 00 00 49 89 c7 49 bd 00 00 00 00 00 fc ff df 48 8b 44 24 28 <42> 80 3c 28 00 4c 8b 74 24 08 74 08 4c 89 f7 e8 00 96 98 00 4d 89
RSP: 0018:ffffc90000007890 EFLAGS: 00000002
RAX: 1ffff92000000f36 RBX: ffffc90000007968 RCX: 1ffff92000000f01
RDX: ffffc90000007ff8 RSI: ffffffff8e2dd448 RDI: ffffc90000007ff0
RBP: ffffc90000007ff0 R08: 0000000000000005 R09: 000000000000000a
R10: fffff52000000f39 R11: 1ffff92000000f37 R12: 1ffff92000000f2e
R13: dffffc0000000000 R14: ffffc90000000000 R15: ffffffff8a17b108
FS: 00007fa3838376c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2b9414 CR3: 0000000054d14000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
__kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737
slab_alloc_node mm/slub.c:3359 [inline]
slab_alloc mm/slub.c:3367 [inline]
__kmem_cache_alloc_lru mm/slub.c:3374 [inline]
kmem_cache_alloc+0x123/0x2f0 mm/slub.c:3383
__sigqueue_alloc+0x40c/0x520 kernel/signal.c:436
__send_signal_locked+0x22f/0xde0 kernel/signal.c:1129
do_send_sig_info kernel/signal.c:1301 [inline]
group_send_sig_info+0x1f6/0x250 kernel/signal.c:1449
do_bpf_send_signal+0x7b/0x150 kernel/trace/bpf_trace.c:840
irq_work_single+0xd1/0x230 kernel/irq_work.c:211
irq_work_run_list kernel/irq_work.c:242 [inline]
irq_work_run+0x152/0x2e0 kernel/irq_work.c:251
__sysvec_irq_work+0xba/0x350 arch/x86/kernel/irq_work.c:22
instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
sysvec_irq_work+0x98/0xc0 arch/x86/kernel/irq_work.c:17
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:207 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:147 [inline]
RIP: 0010:wrmsr arch/x86/include/asm/msr.h:254 [inline]
RIP: 0010:native_apic_msr_write+0x35/0x50 arch/x86/include/asm/apic.h:206
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 89 f6 31 d2 e9 1f ea f7 02 66 2e 0f 1f 84 00 00 00 00 00
RSP: 0018:ffffc9000c857cb0 EFLAGS: 00000246
RAX: 00000000000000f6 RBX: ffffffff8c5e4b88 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000083f
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffff5200190af85
R10: fffff5200190af85 R11: 1ffff9200190af84 R12: ffff8880b8e33e01
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000020
arch_irq_work_raise+0x82/0xd0 arch/x86/kernel/irq_work.c:31
irq_work_queue+0x95/0x140 kernel/irq_work.c:114
bpf_send_signal_common+0x2b2/0x420 kernel/trace/bpf_trace.c:879
____bpf_send_signal kernel/trace/bpf_trace.c:888 [inline]
bpf_send_signal+0x15/0x20 kernel/trace/bpf_trace.c:886
bpf_prog_7ba5217f62dcd359+0x38/0x3c
bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2285 [inline]
bpf_trace_run2+0x1cd/0x3b0 kernel/trace/bpf_trace.c:2324
__bpf_trace_sys_enter+0x60/0x70 include/trace/events/syscalls.h:18
trace_sys_enter+0x6b/0x80 include/trace/events/syscalls.h:18
syscall_trace_enter+0xf0/0x150 kernel/entry/common.c:81
do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:77
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa38292b829
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007fa383836a80 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007fa382be5fa0 RCX: 00007fa38292b829
RDX: 00007fa383836a80 RSI: 00007fa383836bb0 RDI: 0000000000000011
RBP: 00007fa382a13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa382be6038 R14: 00007fa382be5fa0 R15: 00007fffbf3f4908
vkms_vblank_simulate: vblank timer overrun