IPVS: lblc: UDP 224.0.0.2:0 - no destination available
============================================
WARNING: possible recursive locking detected
6.12.0-rc5-syzkaller-00308-g3e5e6c9900c3 #0 Not tainted
--------------------------------------------
swapper/0/0 is trying to acquire lock:
ffffc900272090d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x36e/0x4b0 kernel/bpf/ringbuf.c:427
but task is already holding lock:
ffffc90025e310d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x36e/0x4b0 kernel/bpf/ringbuf.c:427
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&rb->spinlock);
lock(&rb->spinlock);
*** DEADLOCK ***
May be due to missing lock nesting notation
6 locks held by swapper/0/0:
#0: ffffc9002e08fba0 (&x->wait#28){-.-.}-{2:2}, at: complete_with_flags kernel/sched/completion.c:20 [inline]
#0: ffffc9002e08fba0 (&x->wait#28){-.-.}-{2:2}, at: complete+0x1d/0x200 kernel/sched/completion.c:47
#1: ffff888022435298 (&p->pi_lock){-.-.}-{2:2}, at: class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]
#1: ffff888022435298 (&p->pi_lock){-.-.}-{2:2}, at: try_to_wake_up+0xa1/0x14f0 kernel/sched/core.c:4165
#2: ffff88802b63ee98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:606 [inline]
#2: ffff88802b63ee98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:591
#3: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#3: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#3: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2315 [inline]
#3: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1c2/0x590 kernel/trace/bpf_trace.c:2357
#4: ffffc90025e310d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x36e/0x4b0 kernel/bpf/ringbuf.c:427
#5: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#5: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#5: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2315 [inline]
#5: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1c2/0x590 kernel/trace/bpf_trace.c:2357
stack backtrace:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.12.0-rc5-syzkaller-00308-g3e5e6c9900c3 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_deadlock_bug+0x2e3/0x410 kernel/locking/lockdep.c:3037
check_deadlock kernel/locking/lockdep.c:3089 [inline]
validate_chain kernel/locking/lockdep.c:3891 [inline]
__lock_acquire+0x2185/0x3ce0 kernel/locking/lockdep.c:5202
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5825
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
__bpf_ringbuf_reserve+0x36e/0x4b0 kernel/bpf/ringbuf.c:427
____bpf_ringbuf_reserve kernel/bpf/ringbuf.c:478 [inline]
bpf_ringbuf_reserve+0x57/0x90 kernel/bpf/ringbuf.c:470
bpf_prog_0e153dac479590bf+0x35/0x70
bpf_dispatcher_nop_func include/linux/bpf.h:1265 [inline]
__bpf_prog_run include/linux/filter.h:701 [inline]
bpf_prog_run include/linux/filter.h:708 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2316 [inline]
bpf_trace_run2+0x231/0x590 kernel/trace/bpf_trace.c:2357
__traceiter_contention_begin+0x5a/0xa0 include/trace/events/lock.h:95
__preempt_count_dec_and_test arch/x86/include/asm/preempt.h:94 [inline]
trace_contention_begin.constprop.0+0xed/0x170 include/trace/events/lock.h:95
__pv_queued_spin_lock_slowpath+0x10b/0xc90 kernel/locking/qspinlock.c:402
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:584 [inline]
queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
do_raw_spin_lock+0x210/0x2c0 kernel/locking/spinlock_debug.c:116
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0x42/0x60 kernel/locking/spinlock.c:162
__bpf_ringbuf_reserve+0x36e/0x4b0 kernel/bpf/ringbuf.c:427
____bpf_ringbuf_reserve kernel/bpf/ringbuf.c:478 [inline]
bpf_ringbuf_reserve+0x57/0x90 kernel/bpf/ringbuf.c:470
bpf_prog_0e153dac479590bf+0x35/0x70
bpf_dispatcher_nop_func include/linux/bpf.h:1265 [inline]
__bpf_prog_run include/linux/filter.h:701 [inline]
bpf_prog_run include/linux/filter.h:708 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2316 [inline]
bpf_trace_run2+0x231/0x590 kernel/trace/bpf_trace.c:2357
__traceiter_contention_begin+0x5a/0xa0 include/trace/events/lock.h:95
__preempt_count_dec_and_test arch/x86/include/asm/preempt.h:94 [inline]
trace_contention_begin.constprop.0+0xed/0x170 include/trace/events/lock.h:95
__pv_queued_spin_lock_slowpath+0x10b/0xc90 kernel/locking/qspinlock.c:402
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:584 [inline]
queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
do_raw_spin_lock+0x210/0x2c0 kernel/locking/spinlock_debug.c:116
raw_spin_rq_lock_nested kernel/sched/core.c:606 [inline]
raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:591
raw_spin_rq_lock kernel/sched/sched.h:1505 [inline]
rq_lock kernel/sched/sched.h:1804 [inline]
ttwu_queue kernel/sched/core.c:3951 [inline]
try_to_wake_up+0x52e/0x14f0 kernel/sched/core.c:4281
swake_up_locked kernel/sched/swait.c:29 [inline]
swake_up_locked kernel/sched/swait.c:21 [inline]
complete_with_flags kernel/sched/completion.c:24 [inline]
complete+0xb0/0x200 kernel/sched/completion.c:47
csd_do_func kernel/smp.c:134 [inline]
__flush_smp_call_function_queue+0x41f/0x8c0 kernel/smp.c:571
__sysvec_call_function_single+0x8c/0x410 arch/x86/kernel/smp.c:271
instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
sysvec_call_function_single+0x9f/0xc0 arch/x86/kernel/smp.c:266
asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709
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:92 [inline]
RIP: 0010:default_idle+0xf/0x20 arch/x86/kernel/process.c:743
Code: 4c 01 c7 4c 29 c2 e9 72 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d d3 14 32 00 fb f4 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffffff8da07e20 EFLAGS: 00000206
RAX: 0000000000437947 RBX: 0000000000000000 RCX: ffffffff8b146dc9
RDX: 0000000000000000 RSI: ffffffff8b4cc8e0 RDI: ffffffff8bb135a0
RBP: fffffbfff1b52af8 R08: 0000000000000001 R09: ffffed1005687025
R10: ffff88802b43812b R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8da957c0 R14: ffffffff901cf388 R15: 0000000000000000
default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x32c/0x3f0 kernel/sched/idle.c:326
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:424
rest_init+0x16b/0x2b0 init/main.c:747
start_kernel+0x3e4/0x4d0 init/main.c:1105
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507
x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488
common_startup_64+0x13e/0x148
IPVS: lblc: UDP 224.0.0.2:0 - no destination available
IPVS: lblc: UDP 224.0.0.2:0 - no destination available
IPVS: lblc: UDP 224.0.0.2:0 - no destination available
IPVS: lblc: UDP 224.0.0.2:0 - no destination available
IPVS: lblc: UDP 224.0.0.2:0 - no destination available
IPVS: lblc: UDP 224.0.0.2:0 - no destination available
IPVS: lblc: UDP 224.0.0.2:0 - no destination available
IPVS: lblc: UDP 224.0.0.2:0 - no destination available
IPVS: lblc: UDP 224.0.0.2:0 - no destination available
----------------
Code disassembly (best guess):
0: 4c 01 c7 add %r8,%rdi
3: 4c 29 c2 sub %r8,%rdx
6: e9 72 ff ff ff jmp 0xffffff7d
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
16: 90 nop
17: 90 nop
18: 90 nop
19: 90 nop
1a: 90 nop
1b: f3 0f 1e fa endbr64
1f: eb 07 jmp 0x28
21: 0f 00 2d d3 14 32 00 verw 0x3214d3(%rip) # 0x3214fb
28: fb sti
29: f4 hlt
* 2a: fa cli <-- trapping instruction
2b: c3 ret
2c: cc int3
2d: cc int3
2e: cc int3
2f: cc int3
30: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1)
37: 00 00 00 00
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop