============================================ WARNING: possible recursive locking detected 6.9.0-rc5-syzkaller-00296-g5eb4573ea63d #0 Not tainted -------------------------------------------- syz-executor.0/6717 is trying to acquire lock: ffff88807bc36820 (&htab->buckets[i].lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] ffff88807bc36820 (&htab->buckets[i].lock){+.-.}-{2:2}, at: sock_hash_delete_elem+0x178/0x400 net/core/sock_map.c:945 but task is already holding lock: ffff88802c741820 (&htab->buckets[i].lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] ffff88802c741820 (&htab->buckets[i].lock){+.-.}-{2:2}, at: sock_hash_delete_elem+0x178/0x400 net/core/sock_map.c:945 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&htab->buckets[i].lock); lock(&htab->buckets[i].lock); *** DEADLOCK *** May be due to missing lock nesting notation 4 locks held by syz-executor.0/6717: #0: ffffffff8dd7dee8 (tracepoints_mutex){+.+.}-{3:3}, at: tracepoint_probe_unregister+0x2e/0x990 kernel/tracepoint.c:548 #1: ffffffff8dd32120 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #1: ffffffff8dd32120 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #1: ffffffff8dd32120 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline] #1: ffffffff8dd32120 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x110/0x420 kernel/trace/bpf_trace.c:2420 #2: ffff88802c741820 (&htab->buckets[i].lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] #2: ffff88802c741820 (&htab->buckets[i].lock){+.-.}-{2:2}, at: sock_hash_delete_elem+0x178/0x400 net/core/sock_map.c:945 #3: ffffffff8dd32120 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #3: ffffffff8dd32120 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #3: ffffffff8dd32120 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline] #3: ffffffff8dd32120 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x110/0x420 kernel/trace/bpf_trace.c:2420 stack backtrace: CPU: 0 PID: 6717 Comm: syz-executor.0 Not tainted 6.9.0-rc5-syzkaller-00296-g5eb4573ea63d #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+0x23d/0x360 lib/dump_stack.c:114 check_deadlock kernel/locking/lockdep.c:3062 [inline] validate_chain kernel/locking/lockdep.c:3856 [inline] __lock_acquire+0x6a95/0x7fa0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e9/0x540 kernel/locking/lockdep.c:5754 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] sock_hash_delete_elem+0x178/0x400 net/core/sock_map.c:945 bpf_prog_2c29ac5cdc6b1842+0x3a/0x3e bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run2+0x200/0x420 kernel/trace/bpf_trace.c:2420 __traceiter_contention_end+0x77/0xb0 include/trace/events/lock.h:122 trace_contention_end+0x10a/0x130 include/trace/events/lock.h:122 __pv_queued_spin_lock_slowpath+0x935/0xc50 kernel/locking/qspinlock.c:560 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+0x298/0x3a0 kernel/locking/spinlock_debug.c:116 spin_lock_bh include/linux/spinlock.h:356 [inline] sock_hash_delete_elem+0x178/0x400 net/core/sock_map.c:945 bpf_prog_2c29ac5cdc6b1842+0x3a/0x3e bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run2+0x200/0x420 kernel/trace/bpf_trace.c:2420 __traceiter_contention_end+0x77/0xb0 include/trace/events/lock.h:122 trace_contention_end+0xeb/0x110 include/trace/events/lock.h:122 __mutex_lock_common kernel/locking/mutex.c:617 [inline] __mutex_lock+0x2e1/0xd60 kernel/locking/mutex.c:752 tracepoint_probe_unregister+0x2e/0x990 kernel/tracepoint.c:548 bpf_raw_tp_link_release+0x5f/0x80 kernel/bpf/syscall.c:3511 bpf_link_free+0x10e/0x2d0 kernel/bpf/syscall.c:3052 bpf_link_put_direct kernel/bpf/syscall.c:3093 [inline] bpf_link_release+0x77/0x90 kernel/bpf/syscall.c:3100 __fput+0x429/0x8a0 fs/file_table.c:422 __do_sys_close fs/open.c:1556 [inline] __se_sys_close+0x15c/0x1f0 fs/open.c:1541 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x84/0x190 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f3f4807cd5a Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 03 7f 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 63 7f 02 00 8b 44 24 RSP: 002b:00007fffa400e8e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007f3f4807cd5a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000226 R08: 0000001b2e360000 R09: 00007f3f481abf8c R10: 00007fffa400ea30 R11: 0000000000000293 R12: 00007f3f47c01760 R13: ffffffffffffffff R14: 00007f3f47c00000 R15: 00000000000197aa