======================================================
WARNING: possible circular locking dependency detected
6.12.0-syzkaller-07749-g28eb75e178d3 #0 Not tainted
------------------------------------------------------
syz.2.921/8843 is trying to acquire lock:
ffff888070bd7410 (&htab->lockdep_key#3){....}-{2:2}, at: htab_lock_bucket+0x1a4/0x370 kernel/bpf/hashtab.c:167

but task is already holding lock:
ffff88806f0f73c8 (&htab->lockdep_key#4){....}-{2:2}, at: htab_lock_bucket+0x1a4/0x370 kernel/bpf/hashtab.c:167

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&htab->lockdep_key#4){....}-{2:2}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
       _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
       htab_lock_bucket+0x1a4/0x370 kernel/bpf/hashtab.c:167
       htab_lru_map_delete_elem+0x1f1/0x700 kernel/bpf/hashtab.c:1484
       0xffffffffa0001fef
       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:2351 [inline]
       bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2392
       __traceiter_contention_begin+0x7b/0xb0 include/trace/events/lock.h:95
       trace_contention_begin+0x117/0x140 include/trace/events/lock.h:95
       __pv_queued_spin_lock_slowpath+0x114/0xdb0 kernel/locking/qspinlock.c:402
       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
       htab_lock_bucket+0x1a4/0x370 kernel/bpf/hashtab.c:167
       htab_lru_map_delete_elem+0x1f1/0x700 kernel/bpf/hashtab.c:1484
       bpf_prog_6f5f05285f674219+0x43/0x4c
       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:2351 [inline]
       bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2392
       __traceiter_contention_begin+0x7b/0xb0 include/trace/events/lock.h:95
       trace_contention_begin+0xf5/0x120 include/trace/events/lock.h:95
       __mutex_lock_common kernel/locking/mutex.c:587 [inline]
       __mutex_lock+0x1bd/0xee0 kernel/locking/mutex.c:735
       tracepoint_probe_unregister+0x32/0x990 kernel/tracepoint.c:548
       bpf_raw_tp_link_release+0x45/0x70 kernel/bpf/syscall.c:3580
       bpf_link_free+0xf5/0x250 kernel/bpf/syscall.c:3105
       bpf_link_put_direct kernel/bpf/syscall.c:3145 [inline]
       bpf_link_release+0x78/0x90 kernel/bpf/syscall.c:3152
       __fput+0x23c/0xa50 fs/file_table.c:450
       task_work_run+0x24f/0x310 kernel/task_work.c:239
       resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
       exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
       exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
       __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
       syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
       do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&htab->lockdep_key#3){....}-{2:2}:
       check_prev_add kernel/locking/lockdep.c:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
       __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
       _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
       htab_lock_bucket+0x1a4/0x370 kernel/bpf/hashtab.c:167
       htab_lru_map_delete_elem+0x1f1/0x700 kernel/bpf/hashtab.c:1484
       bpf_prog_6f5f05285f674219+0x43/0x4c
       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:2351 [inline]
       bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2392
       __traceiter_contention_begin+0x7b/0xb0 include/trace/events/lock.h:95
       trace_contention_begin+0x117/0x140 include/trace/events/lock.h:95
       __pv_queued_spin_lock_slowpath+0x114/0xdb0 kernel/locking/qspinlock.c:402
       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
       htab_lock_bucket+0x1a4/0x370 kernel/bpf/hashtab.c:167
       htab_lru_map_delete_elem+0x1f1/0x700 kernel/bpf/hashtab.c:1484
       0xffffffffa0001fef
       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:2351 [inline]
       bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2392
       __traceiter_contention_begin+0x7b/0xb0 include/trace/events/lock.h:95
       trace_contention_begin+0xf5/0x120 include/trace/events/lock.h:95
       __mutex_lock_common kernel/locking/mutex.c:587 [inline]
       __mutex_lock+0x1bd/0xee0 kernel/locking/mutex.c:735
       tracepoint_probe_unregister+0x32/0x990 kernel/tracepoint.c:548
       bpf_raw_tp_link_release+0x45/0x70 kernel/bpf/syscall.c:3580
       bpf_link_free+0xf5/0x250 kernel/bpf/syscall.c:3105
       bpf_link_put_direct kernel/bpf/syscall.c:3145 [inline]
       bpf_link_release+0x78/0x90 kernel/bpf/syscall.c:3152
       __fput+0x23c/0xa50 fs/file_table.c:450
       task_work_run+0x24f/0x310 kernel/task_work.c:239
       resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
       exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
       exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
       __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
       syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
       do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&htab->lockdep_key#4);
                               lock(&htab->lockdep_key#3);
                               lock(&htab->lockdep_key#4);
  lock(&htab->lockdep_key#3);

 *** DEADLOCK ***

4 locks held by syz.2.921/8843:
 #0: ffffffff8e991f88 (tracepoints_mutex){+.+.}-{4:4}, at: tracepoint_probe_unregister+0x32/0x990 kernel/tracepoint.c:548
 #1: ffffffff8e93c860 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #1: ffffffff8e93c860 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffffff8e93c860 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2350 [inline]
 #1: ffffffff8e93c860 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x1fc/0x540 kernel/trace/bpf_trace.c:2392
 #2: ffff88806f0f73c8 (&htab->lockdep_key#4){....}-{2:2}, at: htab_lock_bucket+0x1a4/0x370 kernel/bpf/hashtab.c:167
 #3: ffffffff8e93c860 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #3: ffffffff8e93c860 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #3: ffffffff8e93c860 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2350 [inline]
 #3: ffffffff8e93c860 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x1fc/0x540 kernel/trace/bpf_trace.c:2392

stack backtrace:
CPU: 0 UID: 0 PID: 8843 Comm: syz.2.921 Not tainted 6.12.0-syzkaller-07749-g28eb75e178d3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 htab_lock_bucket+0x1a4/0x370 kernel/bpf/hashtab.c:167
 htab_lru_map_delete_elem+0x1f1/0x700 kernel/bpf/hashtab.c:1484
 bpf_prog_6f5f05285f674219+0x43/0x4c
 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:2351 [inline]
 bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2392
 __traceiter_contention_begin+0x7b/0xb0 include/trace/events/lock.h:95
 trace_contention_begin+0x117/0x140 include/trace/events/lock.h:95
 __pv_queued_spin_lock_slowpath+0x114/0xdb0 kernel/locking/qspinlock.c:402
 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
 htab_lock_bucket+0x1a4/0x370 kernel/bpf/hashtab.c:167
 htab_lru_map_delete_elem+0x1f1/0x700 kernel/bpf/hashtab.c:1484
 </TASK>