rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6098/1:b..l
(detected by 1, t=10502 jiffies, g=57413, q=78)
task:kworker/u4:13 state:R running task stack:20920 pid: 6098 ppid: 2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
context_switch kernel/sched/core.c:5029 [inline]
__schedule+0x12c4/0x45b0 kernel/sched/core.c:6375
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6779
irqentry_exit+0x53/0x80 kernel/entry/common.c:432
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:lock_acquire+0x252/0x4f0 kernel/locking/lockdep.c:5627
Code: 2b 00 74 08 4c 89 f7 e8 0c ac 67 00 f6 44 24 61 02 0f 85 84 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc90003bdfa80 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff9200077bf5c RCX: 1ffff9200077befc
RDX: dffffc0000000000 RSI: ffffffff8aab3d00 RDI: ffffffff8af9fa80
RBP: ffffc90003bdfbd8 R08: dffffc0000000000 R09: fffffbfff2131e19
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff9200077bf58
R13: dffffc0000000000 R14: ffffc90003bdfae0 R15: 0000000000000246
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+0xc1/0x5b0 net/batman-adv/network-coding.c:723
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
rcu: rcu_preempt kthread starved for 10528 jiffies! g57413 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:26144 pid: 15 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5029 [inline]
__schedule+0x12c4/0x45b0 kernel/sched/core.c:6375
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6779
irqentry_exit+0x53/0x80 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:681
RIP: 0010:prepare_to_swait_event+0x1/0x340 kernel/sched/swait.c:104
Code: 48 8b 74 24 20 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d e9 e1 83 e9 08 0f 0b eb 9c 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 <41> 57 41 56 41 55 41 54 53 48 83 ec 28 89 d3 49 89 f5 49 89 fc 49
RSP: 0018:ffffc90000d47c90 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90000d47d68 RCX: ffff88813ff23b80
RDX: 0000000000000402 RSI: ffffc90000d47d60 RDI: ffffffff8cb238e0
RBP: ffffc90000d47df0 R08: ffffffff8a495222 R09: ffffc90000d47a40
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffffc90000d47d60 R14: 0000000000000000 R15: 0000000000000000
rcu_gp_fqs_loop+0x28a/0x1080 kernel/rcu/tree.c:1972
rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2145
kthread+0x3f6/0x4f0 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: 13680 Comm: syz.2.2554 Not tainted 5.15.179-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:22 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:132 [inline]
RIP: 0010:lock_acquire+0x20d/0x4f0 kernel/locking/lockdep.c:5626
Code: 3d ab 8a e8 65 31 dd 08 b8 ff ff ff ff 65 0f c1 05 38 96 9f 7e 83 f8 01 0f 85 a4 01 00 00 49 89 de 48 c1 eb 03 42 80 3c 2b 00 <74> 08 4c 89 f7 e8 a9 ac 67 00 48 c7 44 24 60 00 00 00 00 9c 8f 44
RSP: 0018:ffffc90002ddf680 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 1ffff920005bbedc RCX: ffffffff81639d52
RDX: dffffc0000000000 RSI: ffffffff8aab3d00 RDI: ffffffff8af9fa80
RBP: ffffc90002ddf7c8 R08: dffffc0000000000 R09: fffffbfff2131e1a
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920005bbed8
R13: dffffc0000000000 R14: ffffc90002ddf6e0 R15: 0000000000000046
FS: 00007f6a970676c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000632e1000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
seqcount_lockdep_reader_access+0xf8/0x220 include/linux/seqlock.h:103
timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
ktime_get+0x7f/0x270 kernel/time/timekeeping.c:831
clockevents_program_min_delta+0x55/0x410 kernel/time/clockevents.c:241
hrtimer_start_range_ns+0xada/0xc80 kernel/time/hrtimer.c:1302
posixtimer_rearm+0x1ad/0x3f0 kernel/time/posix-timers.c:328
dequeue_signal+0x1ed/0x520 kernel/signal.c:696
get_signal+0x52e/0x14e0 kernel/signal.c:2781
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:178
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f6a991fe167
Code: ff ff 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
RSP: 002b:00007f6a97067038 EFLAGS: 00000246
RAX: 0000000000000113 RBX: 00007f6a99416fa0 RCX: 00007f6a991fe169
RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f6a9927f2a0 R08: 0000000008000f28 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6a99416fa0 R15: 00007ffce4965518