============================================
WARNING: possible recursive locking detected
6.9.0-rc5-syzkaller-00171-gb2ff42c6d3ab #0 Not tainted
--------------------------------------------
syz-executor.2/11708 is trying to acquire lock:
ffff88806accb1d8 (&qs->lock){-.-.}-{2:2}, at: __queue_map_get+0x14b/0x4d0 kernel/bpf/queue_stack_maps.c:105
but task is already holding lock:
ffff88807ba7b9d8 (&qs->lock){-.-.}-{2:2}, at: queue_stack_map_push_elem+0x1b2/0x660 kernel/bpf/queue_stack_maps.c:210
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&qs->lock);
lock(&qs->lock);
*** DEADLOCK ***
May be due to missing lock nesting notation
4 locks held by syz-executor.2/11708:
#0: ffffffff8e334de0 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
#0: ffffffff8e334de0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2190 [inline]
#0: ffffffff8e334de0 (rcu_callback){....}-{0:0}, at: rcu_core+0xa86/0x1830 kernel/rcu/tree.c:2471
#1: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
#1: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
#1: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline]
#1: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run3+0x14a/0x460 kernel/trace/bpf_trace.c:2421
#2: ffff88807ba7b9d8 (&qs->lock){-.-.}-{2:2}, at: queue_stack_map_push_elem+0x1b2/0x660 kernel/bpf/queue_stack_maps.c:210
#3: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
#3: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
#3: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline]
#3: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x114/0x420 kernel/trace/bpf_trace.c:2420
stack backtrace:
CPU: 1 PID: 11708 Comm: syz-executor.2 Not tainted 6.9.0-rc5-syzkaller-00171-gb2ff42c6d3ab #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
check_deadlock kernel/locking/lockdep.c:3062 [inline]
validate_chain+0x15c1/0x58e0 kernel/locking/lockdep.c:3856
__lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
__queue_map_get+0x14b/0x4d0 kernel/bpf/queue_stack_maps.c:105
bpf_prog_00798911c748094f+0x42/0x46
bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
__bpf_prog_run include/linux/filter.h:650 [inline]
bpf_prog_run include/linux/filter.h:664 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
bpf_trace_run2+0x375/0x420 kernel/trace/bpf_trace.c:2420
trace_contention_end+0x114/0x140 include/trace/events/lock.h:122
__pv_queued_spin_lock_slowpath+0x939/0xc60 kernel/locking/qspinlock.c:560
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
queue_stack_map_push_elem+0x1b2/0x660 kernel/bpf/queue_stack_maps.c:210
bpf_prog_80daba7f9ca62790+0x42/0x46
bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
__bpf_prog_run include/linux/filter.h:650 [inline]
bpf_prog_run include/linux/filter.h:664 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
bpf_trace_run3+0x3b5/0x460 kernel/trace/bpf_trace.c:2421
trace_kmem_cache_free include/trace/events/kmem.h:114 [inline]
kmem_cache_free+0x25a/0x2c0 mm/slub.c:4343
rcu_do_batch kernel/rcu/tree.c:2196 [inline]
rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2471
__do_softirq+0x2c6/0x980 kernel/softirq.c:554
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xf2/0x1c0 kernel/softirq.c:633
irq_exit_rcu+0x9/0x30 kernel/softirq.c:645
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:memcpy_orig+0x38/0x140 arch/x86/lib/memcpy_64.S:73
Code: 00 00 00 40 38 fe 7c 35 48 83 ea 20 48 83 ea 20 4c 8b 06 4c 8b 4e 08 4c 8b 56 10 4c 8b 5e 18 48 8d 76 20 4c 89 07 4c 89 4f 08 <4c> 89 57 10 4c 89 5f 18 48 8d 7f 20 73 d4 83 c2 20 eb 4c 48 01 d6
RSP: 0018:ffffc9000e4c7a08 EFLAGS: 00000206
RAX: ffff88807ecf0000 RBX: ffff88807ecf0000 RCX: ffffffff81361514
RDX: 0000000000000ba0 RSI: ffff8880693c9140 RDI: ffff88807ecf1120
RBP: ffff8880693c8000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88807ecf0000
R13: 00000000ffffffff R14: ffff8880693c8000 R15: dffffc0000000000
arch_dup_task_struct+0x44/0xa0 arch/x86/kernel/process.c:95
dup_task_struct+0x6d/0x7d0 kernel/fork.c:1111
copy_process+0x5d1/0x3df0 kernel/fork.c:2220
kernel_clone+0x226/0x8f0 kernel/fork.c:2797
__do_sys_clone kernel/fork.c:2940 [inline]
__se_sys_clone kernel/fork.c:2924 [inline]
__x64_sys_clone+0x258/0x2a0 kernel/fork.c:2924
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f242427dea9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2424f36078 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f24243abf80 RCX: 00007f242427dea9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000001e821400
RBP: 00007f24242ca4a4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007f24243abf80 R15: 00007ffe4634b788
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 00 00 add %al,(%rax)
2: 40 38 fe cmp %dil,%sil
5: 7c 35 jl 0x3c
7: 48 83 ea 20 sub $0x20,%rdx
b: 48 83 ea 20 sub $0x20,%rdx
f: 4c 8b 06 mov (%rsi),%r8
12: 4c 8b 4e 08 mov 0x8(%rsi),%r9
16: 4c 8b 56 10 mov 0x10(%rsi),%r10
1a: 4c 8b 5e 18 mov 0x18(%rsi),%r11
1e: 48 8d 76 20 lea 0x20(%rsi),%rsi
22: 4c 89 07 mov %r8,(%rdi)
25: 4c 89 4f 08 mov %r9,0x8(%rdi)
* 29: 4c 89 57 10 mov %r10,0x10(%rdi) <-- trapping instruction
2d: 4c 89 5f 18 mov %r11,0x18(%rdi)
31: 48 8d 7f 20 lea 0x20(%rdi),%rdi
35: 73 d4 jae 0xb
37: 83 c2 20 add $0x20,%edx
3a: eb 4c jmp 0x88
3c: 48 01 d6 add %rdx,%rsi