rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P19895/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=196257, q=169 ncpus=1)
task:kworker/u10:27 state:R running task stack:25576 pid:19895 tgid:19895 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:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x205/0x7e0 kernel/entry/common.c:164
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x5e/0x370 kernel/locking/lockdep.c:5872
Code: 05 7b b9 26 12 83 f8 07 0f 87 d9 02 00 00 48 0f a3 05 86 fd f3 0e 0f 82 a4 02 00 00 8b 35 ee 30 f4 0e 85 f6 0f 85 bf 00 00 00 <48> 8b 44 24 30 65 48 2b 05 1d b9 26 12 0f 85 ed 02 00 00 48 83 c4
RSP: 0018:ffffc900056efa28 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000003
RDX: 0000000000000000 RSI: ffffffff8def9dfc RDI: ffffffff8c1c4180
RBP: ffffffff8e7e5420 R08: 00000000668faa8e R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
rcu_read_lock include/linux/rcupdate.h:838 [inline]
batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:757 [inline]
batadv_iv_ogm_schedule_buff+0x5da/0x1520 net/batman-adv/bat_iv_ogm.c:829
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:869 [inline]
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:862 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x6dd/0x860 net/batman-adv/bat_iv_ogm.c:1747
process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314
process_scheduled_works kernel/workqueue.c:3397 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g196257 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=63584
rcu: rcu_preempt kthread starved for 10502 jiffies! g196257 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:28744 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7283
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 21217 Comm: syz.4.3311 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:tipc_sk_lookup+0x3d5/0xa00 net/tipc/socket.c:3001
Code: ff df 48 c1 ea 03 0f b6 14 02 4c 89 f0 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 b0 05 00 00 41 0f b7 87 4e 11 00 00 4c 89 ed <48> 29 c5 0f 84 bf 01 00 00 4c 8d ad 80 00 00 00 bb 01 00 00 00 e8
RSP: 0018:ffffc90004d7ea58 EFLAGS: 00000246
RAX: 0000000000000608 RBX: dffffc0000000000 RCX: ffffffff8b2a9bba
RDX: 0000000000000000 RSI: ffffffff8b2a9be0 RDI: ffff888035d8bd80
RBP: ffff88802df87a08 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff920009afd55
R13: ffff88802df87a08 R14: ffff88807d1e114e R15: ffff88807d1e0000
FS: 00007fbbd79b06c0(0000) GS:ffff888124374000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000e000 CR3: 0000000045e2a000 CR4: 00000000003526f0
Call Trace:
tipc_sk_rcv+0x2ee/0x1c90 net/tipc/socket.c:2492
tipc_node_xmit+0x23e/0xfb0 net/tipc/node.c:1701
tipc_node_xmit_skb net/tipc/node.c:1766 [inline]
tipc_node_distr_xmit+0x177/0x3c0 net/tipc/node.c:1781
tipc_sk_rcv+0xaab/0x1c90 net/tipc/socket.c:2501
tipc_node_xmit+0x23e/0xfb0 net/tipc/node.c:1701
tipc_sk_push_backlog+0x318/0xa00 net/tipc/socket.c:1312
tipc_sk_filter_connect net/tipc/socket.c:2255 [inline]
tipc_sk_filter_rcv+0x960/0x3230 net/tipc/socket.c:2364
tipc_sk_enqueue net/tipc/socket.c:2445 [inline]
tipc_sk_rcv+0xea5/0x1c90 net/tipc/socket.c:2497
tipc_node_xmit+0x23e/0xfb0 net/tipc/node.c:1701
__tipc_sendstream+0x7f2/0x10f0 net/tipc/socket.c:1622
tipc_sendstream+0x4f/0x70 net/tipc/socket.c:1546
sock_sendmsg_nosec net/socket.c:787 [inline]
__sock_sendmsg net/socket.c:802 [inline]
____sys_sendmsg+0x9e1/0xb70 net/socket.c:2698
___sys_sendmsg+0x190/0x1e0 net/socket.c:2752
__sys_sendmmsg+0x205/0x430 net/socket.c:2841
__do_sys_sendmmsg net/socket.c:2868 [inline]
__se_sys_sendmmsg net/socket.c:2865 [inline]
__x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2865
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbbd6b9ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbbd79b0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fbbd6e15fa0 RCX: 00007fbbd6b9ce59
RDX: 00000000000009a6 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007fbbd6c32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000a00 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbbd6e16038 R14: 00007fbbd6e15fa0 R15: 00007fffae223fa8