============================================ WARNING: possible recursive locking detected 6.9.0-syzkaller-12162-gf85af9d955ac #0 Not tainted -------------------------------------------- syz-executor.0/14448 is trying to acquire lock: ffff88805e16f220 (&stab->lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] ffff88805e16f220 (&stab->lock){+.-.}-{2:2}, at: __sock_map_delete net/core/sock_map.c:429 [inline] ffff88805e16f220 (&stab->lock){+.-.}-{2:2}, at: sock_map_delete_elem+0x175/0x250 net/core/sock_map.c:461 but task is already holding lock: ffff88805e16e220 (&stab->lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] ffff88805e16e220 (&stab->lock){+.-.}-{2:2}, at: __sock_map_delete net/core/sock_map.c:429 [inline] ffff88805e16e220 (&stab->lock){+.-.}-{2:2}, at: sock_map_delete_elem+0x175/0x250 net/core/sock_map.c:461 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&stab->lock); lock(&stab->lock); *** DEADLOCK *** May be due to missing lock nesting notation 9 locks held by syz-executor.0/14448: #0: ffff88802fbea420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409 #1: ffff8880590ba200 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:826 [inline] #1: ffff8880590ba200 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_rmdir+0x263/0x580 fs/namei.c:4261 #2: ffff88802fbea610 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1655 [inline] #2: ffff88802fbea610 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1838 [inline] #2: ffff88802fbea610 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x2f4/0xf50 fs/ext4/inode.c:212 #3: ffff88802fbee950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x203f/0x22a0 fs/jbd2/transaction.c:463 #4: ffff88805c3a2a88 (&ei->i_data_sem){++++}-{3:3}, at: ext4_truncate+0x991/0x1180 fs/ext4/inode.c:4134 #5: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #5: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #5: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2402 [inline] #5: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run6+0x2a5/0x600 kernel/trace/bpf_trace.c:2448 #6: ffff88805e16e220 (&stab->lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] #6: ffff88805e16e220 (&stab->lock){+.-.}-{2:2}, at: __sock_map_delete net/core/sock_map.c:429 [inline] #6: ffff88805e16e220 (&stab->lock){+.-.}-{2:2}, at: sock_map_delete_elem+0x175/0x250 net/core/sock_map.c:461 #7: ffff888029f752b0 (&psock->link_lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] #7: ffff888029f752b0 (&psock->link_lock){+...}-{2:2}, at: sock_map_del_link net/core/sock_map.c:157 [inline] #7: ffff888029f752b0 (&psock->link_lock){+...}-{2:2}, at: sock_map_unref+0xcc/0x5e0 net/core/sock_map.c:192 #8: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #8: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #8: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2402 [inline] #8: ffffffff8e333e60 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 kernel/trace/bpf_trace.c:2444 stack backtrace: CPU: 0 PID: 14448 Comm: syz-executor.0 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_deadlock kernel/locking/lockdep.c:3062 [inline] validate_chain+0x15d3/0x5900 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_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 bpf_prog_d247abf228e51871+0x69/0x6d 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_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2444 trace_kfree include/trace/events/kmem.h:94 [inline] kfree+0x2bb/0x360 mm/slub.c:4544 sk_psock_free_link include/linux/skmsg.h:423 [inline] sock_map_del_link net/core/sock_map.c:170 [inline] sock_map_unref+0x3ac/0x5e0 net/core/sock_map.c:192 __sock_map_delete net/core/sock_map.c:435 [inline] sock_map_delete_elem+0x1a2/0x250 net/core/sock_map.c:461 bpf_prog_8a405b5ced52e191+0x4a/0x4e 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_run6+0x395/0x600 kernel/trace/bpf_trace.c:2448 __bpf_trace_ext4_ext_remove_space_done+0x43/0x60 include/trace/events/ext4.h:2128 trace_ext4_ext_remove_space_done include/trace/events/ext4.h:2128 [inline] ext4_ext_remove_space+0x4c1c/0x4e40 fs/ext4/extents.c:3007 ext4_ext_truncate+0x159/0x2b0 fs/ext4/extents.c:4441 ext4_truncate+0xa18/0x1180 fs/ext4/inode.c:4139 ext4_evict_inode+0x90f/0xf50 fs/ext4/inode.c:258 evict+0x2a8/0x630 fs/inode.c:667 d_delete_notify include/linux/fsnotify.h:326 [inline] vfs_rmdir+0x3d7/0x510 fs/namei.c:4227 do_rmdir+0x3b5/0x580 fs/namei.c:4273 __do_sys_unlinkat fs/namei.c:4449 [inline] __se_sys_unlinkat fs/namei.c:4443 [inline] __x64_sys_unlinkat+0xe0/0xf0 fs/namei.c:4443 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: 0033:0x7fa15ba7c747 Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 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:00007ffd8eb56e08 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fa15ba7c747 RDX: 0000000000000200 RSI: 00007ffd8eb57f70 RDI: 00000000ffffff9c RBP: 00007fa15bad9636 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffd8eb57f70 R13: 00007fa15bad9636 R14: 00000000000ec6b8 R15: 0000000000000015