============================================
WARNING: possible recursive locking detected
6.12.0-rc4-syzkaller-00161-gae90f6a6170d #0 Not tainted
--------------------------------------------
syz.0.200/6804 is trying to acquire lock:
ffffc9000c4e60d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x1ea/0x600 kernel/bpf/ringbuf.c:427
but task is already holding lock:
ffffc9000be770d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x1ea/0x600 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
4 locks held by syz.0.200/6804:
#0: ffffffff8e937ee0 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e937ee0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2561 [inline]
#0: ffffffff8e937ee0 (rcu_callback){....}-{0:0}, at: rcu_core+0xa37/0x17a0 kernel/rcu/tree.c:2823
#1: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#1: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2315 [inline]
#1: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 kernel/trace/bpf_trace.c:2357
#2: ffffc9000be770d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x1ea/0x600 kernel/bpf/ringbuf.c:427
#3: ffffffff8e937e20 (rcu_read_lock){....}-{1:2}, at: trace_call_bpf+0xbc/0x8a0
stack backtrace:
CPU: 0 UID: 0 PID: 6804 Comm: syz.0.200 Not tainted 6.12.0-rc4-syzkaller-00161-gae90f6a6170d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3037
check_deadlock kernel/locking/lockdep.c:3089 [inline]
validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3891
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
__bpf_ringbuf_reserve+0x1ea/0x600 kernel/bpf/ringbuf.c:427
____bpf_ringbuf_reserve kernel/bpf/ringbuf.c:478 [inline]
bpf_ringbuf_reserve+0x5c/0x70 kernel/bpf/ringbuf.c:470
bpf_prog_ccff7ebd8a0698ee+0x36/0x53
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_prog_run_array include/linux/bpf.h:2131 [inline]
trace_call_bpf+0x369/0x8a0 kernel/trace/bpf_trace.c:146
perf_trace_run_bpf_submit+0x82/0x180 kernel/events/core.c:10416
perf_trace_lock_acquire+0x3c3/0x4f0 include/trace/events/lock.h:24
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0x51b/0x550 kernel/locking/lockdep.c:5796
rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2315 [inline]
bpf_trace_run2+0x219/0x540 kernel/trace/bpf_trace.c:2357
trace_contention_end+0x114/0x140 include/trace/events/lock.h:122
__pv_queued_spin_lock_slowpath+0xb7e/0xdb0 kernel/locking/qspinlock.c:557
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:584 [inline]
queued_spin_lock_slowpath+0x42/0x50 arch/x86/include/asm/qspinlock.h:51
queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
do_raw_spin_lock+0x272/0x370 kernel/locking/spinlock_debug.c:116
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0xe1/0x120 kernel/locking/spinlock.c:162
__bpf_ringbuf_reserve+0x1ea/0x600 kernel/bpf/ringbuf.c:427
____bpf_ringbuf_reserve kernel/bpf/ringbuf.c:478 [inline]
bpf_ringbuf_reserve+0x5c/0x70 kernel/bpf/ringbuf.c:470
bpf_prog_8976cc69110aa25b+0x36/0x53
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+0x2ec/0x540 kernel/trace/bpf_trace.c:2357
trace_kfree include/trace/events/kmem.h:94 [inline]
kfree+0x35e/0x440 mm/slub.c:4714
rcu_do_batch kernel/rcu/tree.c:2567 [inline]
rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823
handle_softirqs+0x2c5/0x980 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:finish_task_switch+0x1ea/0x870 kernel/sched/core.c:5202
Code: c9 50 e8 e9 00 0c 00 48 83 c4 08 4c 89 f7 e8 4d 39 00 00 0f 1f 44 00 00 4c 89 f7 e8 10 4f 6c 0a e8 cb 59 38 00 fb 48 8b 5d c0 <48> 8d bb f8 15 00 00 48 89 f8 48 c1 e8 03 49 be 00 00 00 00 00 fc
RSP: 0018:ffffc90002f8f2e8 EFLAGS: 00000282
RAX: ec86d462f1733200 RBX: ffff88802589bc00 RCX: ffffffff9a3d1903
RDX: dffffc0000000000 RSI: ffffffff8c0acb40 RDI: ffffffff8c610360
RBP: ffffc90002f8f330 R08: ffffffff901d026f R09: 1ffffffff203a04d
R10: dffffc0000000000 R11: fffffbfff203a04e R12: 1ffff110170c7f14
R13: dffffc0000000000 R14: ffff8880b863ea80 R15: ffff8880b863f8a0
context_switch kernel/sched/core.c:5331 [inline]
__schedule+0x18b7/0x4bd0 kernel/sched/core.c:6690
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7012
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:obj_cgroup_put include/linux/memcontrol.h:827 [inline]
RIP: 0010:mod_objcg_state+0x5d9/0x930 mm/memcontrol.c:2743
Code: 3c 23 00 74 08 4c 89 f7 e8 94 aa f6 ff f6 84 24 81 00 00 00 02 0f 85 89 00 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 8b 7c 24 28 <48> 85 ff 74 05 e8 cd 8c 00 00 48 c7 44 24 60 0e 36 e0 45 48 8b 44
RSP: 0018:ffffc90002f8f6e0 EFLAGS: 00000206
RAX: ec86d462f1733200 RBX: 1ffff920005f1eec RCX: ffffffff9a3d1903
RDX: dffffc0000000000 RSI: ffffffff8c0acb40 RDI: 0000000000000000
RBP: ffffc90002f8f7e8 R08: ffffffff901d026f R09: 1ffffffff203a04d
R10: dffffc0000000000 R11: fffffbfff203a04e R12: dffffc0000000000
R13: 0000000000000058 R14: ffffc90002f8f760 R15: 0000000000000246
__memcg_slab_free_hook+0x9f/0x310 mm/memcontrol.c:3011
memcg_slab_free_hook mm/slub.c:2182 [inline]
slab_free mm/slub.c:4576 [inline]
kfree+0x23d/0x440 mm/slub.c:4727
mq_create_mount ipc/mqueue.c:486 [inline]
mq_init_ns+0x3d9/0x540 ipc/mqueue.c:1701
create_ipc_ns ipc/namespace.c:73 [inline]
copy_ipcs+0x321/0x530 ipc/namespace.c:112
create_new_namespaces+0x221/0x7b0 kernel/nsproxy.c:90
copy_namespaces+0x41a/0x490 kernel/nsproxy.c:179
copy_process+0x1929/0x3d50 kernel/fork.c:2375
kernel_clone+0x226/0x8f0 kernel/fork.c:2784
__do_sys_clone kernel/fork.c:2927 [inline]
__se_sys_clone kernel/fork.c:2911 [inline]
__x64_sys_clone+0x258/0x2a0 kernel/fork.c:2911
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9b7517e719
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9b76021fe8 EFLAGS: 00000202 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f9b75335f80 RCX: 00007f9b7517e719
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000008020440
RBP: 00007f9b751f132e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9b75335f80 R15: 00007ffeddd592a8
----------------
Code disassembly (best guess):
0: c9 leave
1: 50 push %rax
2: e8 e9 00 0c 00 call 0xc00f0
7: 48 83 c4 08 add $0x8,%rsp
b: 4c 89 f7 mov %r14,%rdi
e: e8 4d 39 00 00 call 0x3960
13: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
18: 4c 89 f7 mov %r14,%rdi
1b: e8 10 4f 6c 0a call 0xa6c4f30
20: e8 cb 59 38 00 call 0x3859f0
25: fb sti
26: 48 8b 5d c0 mov -0x40(%rbp),%rbx
* 2a: 48 8d bb f8 15 00 00 lea 0x15f8(%rbx),%rdi <-- trapping instruction
31: 48 89 f8 mov %rdi,%rax
34: 48 c1 e8 03 shr $0x3,%rax
38: 49 rex.WB
39: be 00 00 00 00 mov $0x0,%esi
3e: 00 fc add %bh,%ah