rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4268/1:b..l
(detected by 0, t=10502 jiffies, g=6285, q=120)
task:kworker/u4:5 state:R running task stack:22824 pid: 4268 ppid: 2 flags:0x00004000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
context_switch kernel/sched/core.c:5030 [inline]
__schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6780
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:find_stack lib/stackdepot.c:209 [inline]
RIP: 0010:stack_depot_save+0x16a/0x440 lib/stackdepot.c:280
Code: e4 89 42 12 41 89 ee 41 81 e6 ff ff 0f 00 4f 8b 7c f5 00 4d 85 ff 74 58 89 d9 eb 08 4d 8b 3f 4d 85 ff 74 4c 41 39 6f 08 75 f2 <41> 39 5f 0c 75 ec 31 f6 4c 8b 04 f7 4d 3b 44 f7 18 75 df 48 ff c6
RSP: 0000:ffffc90003fdf520 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 000000000000000c RCX: 000000000000000c
RDX: 0000000000020a20 RSI: 00000000fcd76efb RDI: ffffc90003fdf580
RBP: 0000000069890f40 R08: 000000009d6ed988 R09: 0000000000000003
R10: 0000000095ab20af R11: 00000000e0b7eff1 R12: ffff88814c16a368
R13: ffff88823b000000 R14: 0000000000090f40 R15: ffff88805f5f5dd0
kasan_save_stack mm/kasan/common.c:40 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
__kasan_slab_alloc+0xb3/0xd0 mm/kasan/common.c:467
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
kmem_cache_alloc_node+0x12d/0x2d0 mm/slub.c:3256
__alloc_skb+0xf4/0x750 net/core/skbuff.c:415
__netdev_alloc_skb+0x103/0x4a0 net/core/skbuff.c:494
__netdev_alloc_skb_ip_align include/linux/skbuff.h:3021 [inline]
netdev_alloc_skb_ip_align include/linux/skbuff.h:3031 [inline]
batadv_iv_ogm_aggregate_new net/batman-adv/bat_iv_ogm.c:558 [inline]
batadv_iv_ogm_queue_add+0x73e/0xcf0 net/batman-adv/bat_iv_ogm.c:670
batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:849 [inline]
batadv_iv_ogm_schedule+0xacc/0xe90 net/batman-adv/bat_iv_ogm.c:868
batadv_iv_send_outstanding_bat_ogm_packet+0x72d/0x840 net/batman-adv/bat_iv_ogm.c:1712
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 10531 jiffies! g6285 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:28032 pid: 15 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5030 [inline]
__schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
schedule+0x11b/0x1e0 kernel/sched/core.c:6459
schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4309 Comm: syz.0.10 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x81/0x290 mm/kasan/generic.c:189
Code: 03 4e 8d 14 3b 4d 89 d6 4d 29 ce 49 83 fe 10 7f 26 4d 85 f6 0f 84 39 01 00 00 48 f7 d3 4c 01 db 41 80 39 00 0f 85 c1 01 00 00 <49> ff c1 48 ff c3 75 ee e9 1c 01 00 00 44 89 cb 83 e3 07 0f 84 b5
RSP: 0018:ffffc9000301fc68 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffffffffffffff RCX: ffffffff812b9d45
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888026eb8000
RBP: ffffc9000301fec0 R08: dffffc0000000000 R09: ffffed1004dd7000
R10: ffffed1004dd7001 R11: 1ffff11004dd7000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000001 R15: dffffc0000000001
FS: 00007f6c226d36c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6c24ab4098 CR3: 0000000024fda000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
instrument_atomic_write include/linux/instrumented.h:86 [inline]
clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline]
clear_ti_thread_flag include/linux/thread_info.h:94 [inline]
fpregs_mark_activate arch/x86/kernel/fpu/core.c:431 [inline]
fpu__clear_user_states+0x1a5/0x260 arch/x86/kernel/fpu/core.c:387
handle_signal arch/x86/kernel/signal.c:840 [inline]
arch_do_signal_or_restart+0xf18/0x1300 arch/x86/kernel/signal.c:869
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0x9e/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+0x16/0x40 kernel/entry/common.c:307
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f6c2474b990
Code: 44 24 20 0f 29 44 24 30 0f 29 44 24 40 48 8b 44 24 08 ff d0 48 83 c4 50 31 c0 5b 5d 41 5c 41 5d 41 5e c3 0f 1f 80 00 00 00 00 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 c3 66 66 2e 0f 1f
RSP: 002b:00007f6c226d2b38 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f6c24ab4098 RCX: 00007f6c2488cbe9
RDX: 00007f6c226d2b40 RSI: 00007f6c226d2c70 RDI: 0000000000000011
RBP: 00007f6c24ab4090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6c24ab4128 R14: 00007ffc94e6f5d0 R15: 00007ffc94e6f6b8
sched: RT throttling activated