====================================================== WARNING: possible circular locking dependency detected 6.9.0-syzkaller-12162-gf85af9d955ac #0 Not tainted ------------------------------------------------------ syz-executor.3/7364 is trying to acquire lock: ffff88801f1793f0 (clock-AF_UNIX){++..}-{2:2}, at: sk_psock_drop+0x34/0x500 net/core/skmsg.c:837 but task is already holding lock: ffff88802c71b220 (&stab->lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] ffff88802c71b220 (&stab->lock){+.-.}-{2:2}, at: __sock_map_delete net/core/sock_map.c:429 [inline] ffff88802c71b220 (&stab->lock){+.-.}-{2:2}, at: sock_map_delete_elem+0x175/0x250 net/core/sock_map.c:461 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&stab->lock){+.-.}-{2:2}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] __sock_map_delete net/core/sock_map.c:429 [inline] sock_map_delete_elem+0x175/0x250 net/core/sock_map.c:461 0xffffffffa0001fec bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline] __bpf_prog_run include/linux/filter.h:682 [inline] bpf_prog_run include/linux/filter.h:698 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2403 [inline] bpf_trace_run2+0x47d/0x540 kernel/trace/bpf_trace.c:2444 trace_kfree include/trace/events/kmem.h:94 [inline] kfree+0x2bb/0x360 mm/slub.c:4544 __bpf_prog_put_noref+0xd7/0x310 kernel/bpf/syscall.c:2257 bpf_prog_put_deferred+0x2f3/0x3e0 kernel/bpf/syscall.c:2283 __bpf_prog_put kernel/bpf/syscall.c:2295 [inline] bpf_prog_put+0x264/0x2a0 kernel/bpf/syscall.c:2302 psock_set_prog include/linux/skmsg.h:479 [inline] sk_psock_stop_verdict net/core/skmsg.c:1247 [inline] sk_psock_drop+0x214/0x500 net/core/skmsg.c:843 sk_psock_put include/linux/skmsg.h:461 [inline] sock_map_close+0x209/0x2d0 net/core/sock_map.c:1695 unix_release+0x85/0xc0 net/unix/af_unix.c:1048 __sock_release net/socket.c:659 [inline] sock_close+0xbc/0x240 net/socket.c:1421 __fput+0x406/0x8b0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 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:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (clock-AF_UNIX){++..}-{2:2}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline] _raw_write_lock_bh+0x35/0x50 kernel/locking/spinlock.c:334 sk_psock_drop+0x34/0x500 net/core/skmsg.c:837 __sock_map_delete net/core/sock_map.c:435 [inline] sock_map_delete_elem+0x1a2/0x250 net/core/sock_map.c:461 bpf_prog_107af3efe6330ca3+0x42/0x46 bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline] __bpf_prog_run include/linux/filter.h:691 [inline] bpf_prog_run include/linux/filter.h:698 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2403 [inline] bpf_trace_run10+0x420/0x680 kernel/trace/bpf_trace.c:2452 __bpf_trace_percpu_alloc_percpu+0x4e/0x70 include/trace/events/percpu.h:11 trace_percpu_alloc_percpu include/trace/events/percpu.h:11 [inline] pcpu_alloc_noprof+0x1519/0x16e0 mm/percpu.c:1904 bpf_prog_alloc_no_stats+0x10d/0x4b0 kernel/bpf/core.c:113 bpf_prog_alloc+0x3a/0x1b0 kernel/bpf/core.c:145 bpf_prog_load+0x7f7/0x20f0 kernel/bpf/syscall.c:2818 __sys_bpf+0x4ee/0x810 kernel/bpf/syscall.c:5709 __do_sys_bpf kernel/bpf/syscall.c:5816 [inline] __se_sys_bpf kernel/bpf/syscall.c:5814 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5814 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 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&stab->lock); lock(clock-AF_UNIX); lock(&stab->lock); lock(clock-AF_UNIX); *** DEADLOCK *** 2 locks held by syz-executor.3/7364: #0: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #0: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2402 [inline] #0: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run10+0x330/0x680 kernel/trace/bpf_trace.c:2452 #1: ffff88802c71b220 (&stab->lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] #1: ffff88802c71b220 (&stab->lock){+.-.}-{2:2}, at: __sock_map_delete net/core/sock_map.c:429 [inline] #1: ffff88802c71b220 (&stab->lock){+.-.}-{2:2}, at: sock_map_delete_elem+0x175/0x250 net/core/sock_map.c:461 stack backtrace: CPU: 0 PID: 7364 Comm: syz-executor.3 Not tainted 6.9.0-syzkaller-12162-gf85af9d955ac #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline] _raw_write_lock_bh+0x35/0x50 kernel/locking/spinlock.c:334 sk_psock_drop+0x34/0x500 net/core/skmsg.c:837 __sock_map_delete net/core/sock_map.c:435 [inline] sock_map_delete_elem+0x1a2/0x250 net/core/sock_map.c:461 bpf_prog_107af3efe6330ca3+0x42/0x46 bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline] __bpf_prog_run include/linux/filter.h:691 [inline] bpf_prog_run include/linux/filter.h:698 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2403 [inline] bpf_trace_run10+0x420/0x680 kernel/trace/bpf_trace.c:2452 __bpf_trace_percpu_alloc_percpu+0x4e/0x70 include/trace/events/percpu.h:11 trace_percpu_alloc_percpu include/trace/events/percpu.h:11 [inline] pcpu_alloc_noprof+0x1519/0x16e0 mm/percpu.c:1904 bpf_prog_alloc_no_stats+0x10d/0x4b0 kernel/bpf/core.c:113 bpf_prog_alloc+0x3a/0x1b0 kernel/bpf/core.c:145 bpf_prog_load+0x7f7/0x20f0 kernel/bpf/syscall.c:2818 __sys_bpf+0x4ee/0x810 kernel/bpf/syscall.c:5709 __do_sys_bpf kernel/bpf/syscall.c:5816 [inline] __se_sys_bpf kernel/bpf/syscall.c:5814 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5814 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: 0033:0x7f940827cf69 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:00007f9408f4a0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f94083b3f80 RCX: 00007f940827cf69 RDX: 0000000000000090 RSI: 00000000200000c0 RDI: 0000000000000005 RBP: 00007f94082da6fe R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f94083b3f80 R15: 00007ffeb36a6528