rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4391/1:b..l
(detected by 1, t=10502 jiffies, g=7529, q=19)
task:kworker/u4:6 state:R running task stack:26504 pid: 4391 ppid: 2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:681
RIP: 0010:trace_lock_acquire include/trace/events/lock.h:13 [inline]
RIP: 0010:lock_acquire+0xcd/0x3f0 kernel/locking/lockdep.c:5594
Code: 44 89 f0 c1 e8 06 48 8d 3c c5 e8 91 69 8d be 08 00 00 00 e8 d5 3b 60 00 44 89 f0 48 0f a3 05 f2 98 0d 0c 73 0d e8 73 b6 07 00 <84> c0 0f 84 17 02 00 00 48 c7 c0 84 c5 69 8d 48 c1 e8 03 42 0f b6
RSP: 0018:ffffc9000374faa0 EFLAGS: 00000202
RAX: 0000000000006d01 RBX: 0000000000000000 RCX: 5680cc96459aac00
RDX: 0000000000000000 RSI: ffffffff8a59a460 RDI: ffffffff8a59a420
RBP: ffffc9000374fbc0 R08: dffffc0000000000 R09: fffffbfff1ad323e
R10: fffffbfff1ad323e R11: 1ffffffff1ad323d R12: ffffffff8c11c660
R13: 1ffff920006e9f60 R14: 0000000000000000 R15: dffffc0000000000
rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:312
rcu_read_lock include/linux/rcupdate.h:739 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
batadv_nc_worker+0xc9/0x5c0 net/batman-adv/network-coding.c:723
process_one_work+0x863/0x1000 kernel/workqueue.c:2310
worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
rcu: rcu_preempt kthread starved for 4405 jiffies! g7529 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:28192 pid: 15 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:681
RIP: 0010:schedule_timeout+0x0/0x280 kernel/time/timer.c:1876
Code: 40 c1 0b 8a be e2 0a 00 00 31 d2 e8 5a f0 a0 f7 e9 f5 59 e3 f7 e8 f0 b5 c5 f7 c3 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 00 cc <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec c0 00
RSP: 0018:ffffc90000d47cb8 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8a0b1820 RDI: 0000000000000001
RBP: ffffc90000d47e10 R08: dffffc0000000000 R09: fffffbfff18241e5
R10: fffffbfff18241e5 R11: 1ffffffff18241e4 R12: 1ffffffff17c1e30
R13: ffffc90000d47d88 R14: 0000000000000000 R15: 0000000000000001
rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
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: 4556 Comm: syz.0.87 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:mark_lock+0x3f/0x320 kernel/locking/lockdep.c:4560
Code: 00 00 00 00 00 fc ff df 83 fa 08 75 29 4d 8d 7e 20 4c 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 74 02 00 00 41 0f b6 47 02 <24> 03 3c 01 bd 09 00 00 00 83 dd 00 41 bc 01 00 00 00 89 e9 41 d3
RSP: 0018:ffffc90000007940 EFLAGS: 00000046
RAX: 000000000000000c RBX: ffff888020ea3b80 RCX: ffffffff815caf64
RDX: 0000000000000008 RSI: ffff888020ea4698 RDI: ffff888020ea3b80
RBP: 0000000000000008 R08: dffffc0000000000 R09: fffffbfff1ff781b
R10: fffffbfff1ff781b R11: 1ffffffff1ff781a R12: ffff888020ea46b8
R13: dffffc0000000000 R14: ffff888020ea4698 R15: ffff888020ea46b8
FS: 00007f74c88bd6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f74ca8be098 CR3: 000000005e6ea000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
mark_usage kernel/locking/lockdep.c:4512 [inline]
__lock_acquire+0xd5a/0x7c60 kernel/locking/lockdep.c:4966
reacquire_held_locks+0x2f9/0x590 kernel/locking/lockdep.c:5150
__lock_release kernel/locking/lockdep.c:5339 [inline]
lock_release+0x31a/0x870 kernel/locking/lockdep.c:5643
rcu_read_unlock include/linux/rcupdate.h:772 [inline]
__lock_task_sighand+0x272/0x290 kernel/signal.c:1409
lock_task_sighand include/linux/sched/signal.h:710 [inline]
do_send_sig_info kernel/signal.c:1293 [inline]
group_send_sig_info+0x1ac/0x220 kernel/signal.c:1442
do_bpf_send_signal+0x7b/0x150 kernel/trace/bpf_trace.c:779
irq_work_single kernel/irq_work.c:155 [inline]
irq_work_run_list+0x1bb/0x330 kernel/irq_work.c:177
irq_work_run+0x63/0xe0 kernel/irq_work.c:186
__sysvec_irq_work+0x98/0x240 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:713
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:212 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:156 [inline]
RIP: 0010:wrmsr arch/x86/include/asm/msr.h:263 [inline]
RIP: 0010:native_apic_msr_write+0x35/0x50 arch/x86/include/asm/apic.h:208
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 ff b6 c7 02 66 2e 0f 1f 84 00 00 00 00 00
RSP: 0018:ffffc900034efcb0 EFLAGS: 00000246
RAX: 00000000000000f6 RBX: ffffffff8bbc2a20 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000083f
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed10172067af
R10: ffffed10172067af R11: 1ffff110172067ae R12: ffff8880b9033b01
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:75
bpf_send_signal_common+0x2b2/0x420 kernel/trace/bpf_trace.c:820
____bpf_send_signal kernel/trace/bpf_trace.c:829 [inline]
bpf_send_signal+0x15/0x20 kernel/trace/bpf_trace.c:827
bpf_prog_7ba5217f62dcd359+0x38/0xe70
bpf_dispatcher_nop_func include/linux/bpf.h:888 [inline]
__bpf_prog_run include/linux/filter.h:628 [inline]
bpf_prog_run include/linux/filter.h:635 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline]
bpf_trace_run2+0x15b/0x2d0 kernel/trace/bpf_trace.c:1915
__bpf_trace_sys_enter+0x60/0x70 include/trace/events/syscalls.h:18
trace_sys_enter+0x65/0x80 include/trace/events/syscalls.h:18
syscall_trace_enter+0x115/0x180 kernel/entry/common.c:77
do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f74ca612da9
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:00007f74c88bcb40 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f74ca8be098 RCX: 00007f74ca612da9
RDX: 00007f74c88bcb40 RSI: 00007f74c88bcc70 RDI: 0000000000000011
RBP: 00007f74ca8be090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f74ca8be128 R14: 00007ffc7b818e90 R15: 00007ffc7b818f78