rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P18189/1:b..l P18250/3:b..l P132/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=85421, q=1100 ncpus=2)
task:kworker/u8:5 state:R running task stack:24088 pid:132 tgid:132 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7190
irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x62/0x330 kernel/locking/lockdep.c:5872
Code: 76 17 12 83 f8 07 0f 87 a2 02 00 00 89 c0 48 0f a3 05 82 fe ed 0e 0f 82 74 02 00 00 8b 35 1a 2f ee 0e 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 99 76 17 12 0f 85 ad 02 00 00 48 83 c4
RSP: 0018:ffffc90002e87460 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e3c9620 RCX: 00000000e0871288
RDX: 0000000000000000 RSI: ffffffff8da9bfab RDI: ffffffff8bf24280
RBP: 0000000000000002 R08: 000000000cf8a69d R09: 00000000d0cf8a69
R10: 0000000000000002 R11: ffff88801d732ff0 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0xd1/0x20a0 arch/x86/kernel/unwind_orc.c:479
__unwind_start+0x45f/0x7f0 arch/x86/kernel/unwind_orc.c:758
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0x73/0x100 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
poison_kmalloc_redzone mm/kasan/common.c:397 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:414
kasan_kmalloc include/linux/kasan.h:262 [inline]
__do_kmalloc_node mm/slub.c:5652 [inline]
__kmalloc_node_track_caller_noprof+0x353/0x930 mm/slub.c:5759
kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:608
pskb_expand_head+0x238/0xf80 net/core/skbuff.c:2282
__skb_cow include/linux/skbuff.h:3853 [inline]
skb_cow_head include/linux/skbuff.h:3887 [inline]
batadv_skb_head_push+0xf5/0x290 net/batman-adv/mesh-interface.c:71
batadv_send_skb_packet+0xef/0x6f0 net/batman-adv/send.c:81
batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:391 [inline]
batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:419 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x734/0x920 net/batman-adv/bat_iv_ogm.c:1697
process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
process_scheduled_works kernel/workqueue.c:3340 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
task:syz.2.2595 state:R running task stack:20920 pid:18250 tgid:18249 ppid:15302 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:7047
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__local_bh_enable_ip+0x107/0x120 kernel/softirq.c:457
local_bh_enable include/linux/bottom_half.h:33 [inline]
__neigh_event_send+0x330/0x1390 net/core/neighbour.c:1273
neigh_event_send_probe include/net/neighbour.h:480 [inline]
neigh_event_send include/net/neighbour.h:486 [inline]
neigh_event_send include/net/neighbour.h:484 [inline]
neigh_resolve_output+0x56b/0x940 net/core/neighbour.c:1578
neigh_output include/net/neighbour.h:556 [inline]
ip6_finish_output2+0xad1/0x1cf0 net/ipv6/ip6_output.c:136
ip6_fragment+0xbf5/0x27f0 net/ipv6/ip6_output.c:1039
__ip6_finish_output+0x369/0x1010 net/ipv6/ip6_output.c:207
ip6_finish_output net/ipv6/ip6_output.c:220 [inline]
NF_HOOK_COND include/linux/netfilter.h:307 [inline]
ip6_output+0x253/0x710 net/ipv6/ip6_output.c:247
dst_output include/net/dst.h:464 [inline]
NF_HOOK include/linux/netfilter.h:318 [inline]
NF_HOOK include/linux/netfilter.h:312 [inline]
ip6_xmit+0x1512/0x23f0 net/ipv6/ip6_output.c:371
sctp_v6_xmit+0xd28/0x1240 net/sctp/ipv6.c:248
sctp_packet_transmit+0x1f44/0x30b0 net/sctp/output.c:653
sctp_packet_singleton+0x19e/0x370 net/sctp/outqueue.c:783
sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline]
sctp_outq_flush+0x53d/0x33a0 net/sctp/outqueue.c:1212
sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1824 [inline]
sctp_side_effects net/sctp/sm_sideeffect.c:1204 [inline]
sctp_do_sm+0x17d1/0x5e00 net/sctp/sm_sideeffect.c:1175
sctp_primitive_ASSOCIATE+0x9c/0xd0 net/sctp/primitive.c:73
sctp_sendmsg_to_asoc+0xa4a/0x1c50 net/sctp/socket.c:1840
sctp_sendmsg+0xe99/0x1e20 net/sctp/socket.c:2030
inet_sendmsg+0x11c/0x140 net/ipv4/af_inet.c:859
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0x973/0xc30 net/socket.c:2592
___sys_sendmsg+0x134/0x1d0 net/socket.c:2646
__sys_sendmmsg+0x200/0x420 net/socket.c:2735
__do_sys_sendmmsg net/socket.c:2762 [inline]
__se_sys_sendmmsg net/socket.c:2759 [inline]
__x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2759
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f06a278f749
RSP: 002b:00007f06a35f4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f06a29e5fa0 RCX: 00007f06a278f749
RDX: 0000000000000002 RSI: 0000200000000280 RDI: 0000000000000004
RBP: 00007f06a2813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000014 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f06a29e6038 R14: 00007f06a29e5fa0 R15: 00007fffa419b408
task:kworker/u8:22 state:R running task stack:26296 pid:18189 tgid:18189 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound cfg80211_wiphy_work
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7190
irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:114 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:128 [inline]
RIP: 0010:lock_acquire kernel/locking/lockdep.c:5864 [inline]
RIP: 0010:lock_acquire+0x133/0x330 kernel/locking/lockdep.c:5825
Code: 00 65 8b 05 37 bd 17 12 85 c0 0f 85 a2 00 00 00 65 48 8b 05 f7 75 17 12 8b 90 2c 0b 00 00 85 d2 0f 85 8c 00 00 00 9c 8f 04 24 48 c7 c7 44 24 bb 8d e8 30 15 dd 09 45 89 e0 89 e9 44 89 ea 65
RSP: 0018:ffffc9000d41f1f0 EFLAGS: 00000246
RAX: ffff88803571c980 RBX: ffffffff8e3c9620 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff816cb681 RDI: fffffbfff1c792c4
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 000000000009f95e R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0xd1/0x20a0 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
poison_kmalloc_redzone mm/kasan/common.c:397 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:414
kasan_kmalloc include/linux/kasan.h:262 [inline]
__do_kmalloc_node mm/slub.c:5652 [inline]
__kmalloc_noprof+0x33d/0x910 mm/slub.c:5664
kmalloc_noprof include/linux/slab.h:961 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
ieee802_11_parse_elems_full+0x1db/0x3780 net/mac80211/parse.c:1031
ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2469 [inline]
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1571 [inline]
ieee80211_ibss_rx_queued_mgmt+0xc85/0x2fc0 net/mac80211/ibss.c:1602
ieee80211_iface_process_skb net/mac80211/iface.c:1736 [inline]
ieee80211_iface_work+0xe28/0x1350 net/mac80211/iface.c:1790
cfg80211_wiphy_work+0x3fb/0x560 net/wireless/core.c:438
process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
process_scheduled_works kernel/workqueue.c:3340 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: rcu_preempt kthread starved for 10535 jiffies! g85421 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:28136 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6960
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 06 60 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 13 59 13 00 fb f4 cc 35 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197de8 EFLAGS: 000002c6
RAX: 000000000450f7e1 RBX: 0000000000000001 RCX: ffffffff8b7706d9
RDX: 0000000000000000 RSI: ffffffff8dac204b RDI: ffffffff8bf24280
RBP: ffffed1003b56498 R08: 0000000000000001 R09: ffffed10170a673d
R10: ffff8880b85339eb R11: ffff88801dab2ff0 R12: 0000000000000001
R13: ffff88801dab24c0 R14: ffffffff9087f7d0 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888124a09000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1f1d44984d CR3: 0000000076632000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x38d/0x510 kernel/sched/idle.c:332
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x148