============================================
WARNING: possible recursive locking detected
6.14.0-rc5-syzkaller-00129-g505ead7ab77f #0 Not tainted
--------------------------------------------
sshd/5828 is trying to acquire lock:
ffff8880691be1e0 (&qs->lock){-.-.}-{2:2}, at: __stack_map_get+0x14b/0x4b0 kernel/bpf/queue_stack_maps.c:140
but task is already holding lock:
ffff8880691bd1e0 (&qs->lock){-.-.}-{2:2}, at: __stack_map_get+0x14b/0x4b0 kernel/bpf/queue_stack_maps.c:140
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 sshd/5828:
#0: ffff888033278868 (&pipe->mutex){+.+.}-{4:4}, at: pipe_read+0x131/0x12f0 fs/pipe.c:263
#1: ffffffff8eb392e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#1: ffffffff8eb392e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffffff8eb392e0 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2370 [inline]
#1: ffffffff8eb392e0 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x1fc/0x540 kernel/trace/bpf_trace.c:2412
#2: ffff8880691bd1e0 (&qs->lock){-.-.}-{2:2}, at: __stack_map_get+0x14b/0x4b0 kernel/bpf/queue_stack_maps.c:140
#3: ffffffff8eb392e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#3: ffffffff8eb392e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#3: ffffffff8eb392e0 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2370 [inline]
#3: ffffffff8eb392e0 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x1fc/0x540 kernel/trace/bpf_trace.c:2412
stack backtrace:
CPU: 0 UID: 0 PID: 5828 Comm: sshd Not tainted 6.14.0-rc5-syzkaller-00129-g505ead7ab77f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
<TASK>
__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:3039
check_deadlock kernel/locking/lockdep.c:3091 [inline]
validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3893
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
__stack_map_get+0x14b/0x4b0 kernel/bpf/queue_stack_maps.c:140
bpf_prog_9e8ebb70d9ac7f8d+0x45/0x49
bpf_dispatcher_nop_func include/linux/bpf.h:1290 [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:2371 [inline]
bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2412
__bpf_trace_contention_end+0x170/0x230 include/trace/events/lock.h:122
__traceiter_contention_end+0x7b/0xb0 include/trace/events/lock.h:122
__do_trace_contention_end include/trace/events/lock.h:122 [inline]
trace_contention_end+0x118/0x140 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:577 [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
__stack_map_get+0x14b/0x4b0 kernel/bpf/queue_stack_maps.c:140
bpf_prog_9e8ebb70d9ac7f8d+0x45/0x49
bpf_dispatcher_nop_func include/linux/bpf.h:1290 [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:2371 [inline]
bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2412
__bpf_trace_contention_end+0x170/0x230 include/trace/events/lock.h:122
__traceiter_contention_end+0x7b/0xb0 include/trace/events/lock.h:122
__do_trace_contention_end include/trace/events/lock.h:122 [inline]
trace_contention_end+0xf9/0x120 include/trace/events/lock.h:122
__mutex_lock_common kernel/locking/mutex.c:594 [inline]
__mutex_lock+0x38d/0x1010 kernel/locking/mutex.c:730
pipe_read+0x131/0x12f0 fs/pipe.c:263
new_sync_read fs/read_write.c:484 [inline]
vfs_read+0x975/0xb40 fs/read_write.c:565
ksys_read+0x18f/0x2b0 fs/read_write.c:708
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: 0033:0x7f8eb6b16b6a
Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007fff4bc83a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8eb6b16b6a
RDX: 0000000000004000 RSI: 00007fff4bc83a68 RDI: 0000000000000009
RBP: 000055e6c39fc3c0 R08: 0000000000000000 R09: 0000000000000000
R10: 00007fff4bc83a68 R11: 0000000000000246 R12: 000055e6c39f45a0
R13: 000055e6a6231937 R14: 000055e6a6234480 R15: 000055e6c39f45a0
</TASK>