rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P1005/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=29589, q=396471 ncpus=2)
task:kworker/u4:7 state:R running task stack:22632 pid:1005 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7010
irqentry_exit+0x67/0x70 kernel/entry/common.c:438
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lock_acquire+0x208/0x420 kernel/locking/lockdep.c:5758
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc900042ffa40 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 750d28f02fc9dc00
RDX: 0000000000000000 RSI: ffffffff8acada80 RDI: ffffffff8b1c82e0
RBP: ffffc900042ffb48 R08: dffffc0000000000 R09: 1ffffffff2237ea0
R10: dffffc0000000000 R11: fffffbfff2237ea1 R12: 1ffff9200085ff54
R13: ffffffff8d131fa0 R14: 0000000000000246 R15: dffffc0000000000
rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
rcu_read_lock include/linux/rcupdate.h:786 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0xef/0x610 net/batman-adv/network-coding.c:719
process_one_work kernel/workqueue.c:2634 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2711
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
rcu: rcu_preempt kthread starved for 10486 jiffies! g29589 f0x2 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:26960 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x313/0x1590 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
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: 5121 Comm: syslogd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1370 [inline]
RIP: 0010:rq_clock_pelt kernel/sched/pelt.h:66 [inline]
RIP: 0010:cfs_rq_clock_pelt kernel/sched/pelt.h:174 [inline]
RIP: 0010:update_load_avg+0x70/0x13d0 kernel/sched/fair.c:4744
Code: 89 6c 24 1c 0f 85 62 10 00 00 4c 8d b5 70 01 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 03 75 7f 00 4d 8b 3e <48> c7 c0 6c 13 8b 8e 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 c1 10
RSP: 0018:ffffc900032c74c8 EFLAGS: 00000046
RAX: 1ffff1100b89c62e RBX: ffff88802ce69e80 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: ffff88802ce69e80 RDI: ffff88805c4e3000
RBP: ffff88805c4e3000 R08: ffffffff8e8adeaf R09: 1ffffffff1d15bd5
R10: dffffc0000000000 R11: fffffbfff1d15bd6 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff88805c4e3170 R15: ffff8880b8e3c000
FS: 00007fa6e0a7cc80(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055cc6d1a6a38 CR3: 000000002f3bb000 CR4: 00000000003506f0
Call Trace:
set_next_entity+0x107/0x490 kernel/sched/fair.c:5452
set_next_task_fair+0x1de/0x330 kernel/sched/fair.c:12888
set_next_task kernel/sched/sched.h:2318 [inline]
pick_next_task kernel/sched/core.c:6287 [inline]
__schedule+0x3cb8/0x45a0 kernel/sched/core.c:6662
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_timeout+0xc1/0x2d0 kernel/time/timer.c:2144
__skb_wait_for_more_packets+0x3ac/0x590 net/core/datagram.c:120
__unix_dgram_recvmsg+0x2a4/0xd80 net/unix/af_unix.c:2423
sock_recvmsg_nosec net/socket.c:1046 [inline]
sock_recvmsg net/socket.c:1068 [inline]
sock_read_iter+0x2d9/0x3e0 net/socket.c:1138
call_read_iter include/linux/fs.h:2012 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x46a/0x970 fs/read_write.c:470
ksys_read+0x150/0x260 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa6e0bcc407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffdd255ff80 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007fa6e0a7cc80 RCX: 00007fa6e0bcc407
RDX: 00000000000000ff RSI: 0000565351204950 RDI: 0000000000000000
RBP: 0000565351204910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00005653512049a7
R13: 0000000000000000 R14: 0000565351204950 R15: 0000565326231d98