============================================ WARNING: possible recursive locking detected 6.9.0-rc5-syzkaller-00053-ge33c4963bf53 #0 Not tainted -------------------------------------------- syz-executor.0/5554 is trying to acquire lock: ffff88802a51c200 (&stab->lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] ffff88802a51c200 (&stab->lock){+.-.}-{2:2}, at: __sock_map_delete+0x43/0xe0 net/core/sock_map.c:417 but task is already holding lock: ffff88803d869a00 (&stab->lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] ffff88803d869a00 (&stab->lock){+.-.}-{2:2}, at: __sock_map_delete+0x43/0xe0 net/core/sock_map.c:417 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.0/5554: #0: ffff8880270bb548 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xeb/0x180 fs/file.c:1191 #1: ffff888024c68420 (sb_writers#5){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:643 #2: ffff888032a3ca00 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:795 [inline] #2: ffff888032a3ca00 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_dio_write_iter fs/ext4/file.c:530 [inline] #2: ffff888032a3ca00 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_file_write_iter+0xd22/0x1a40 fs/ext4/file.c:696 #3: ffff8880247e2950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x10db/0x15e0 fs/jbd2/transaction.c:463 #4: ffff888032a3c888 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x5ab/0x17d0 fs/ext4/inode.c:616 #5: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #5: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #5: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline] #5: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x107/0x460 kernel/trace/bpf_trace.c:2422 #6: ffff88803d869a00 (&stab->lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] #6: ffff88803d869a00 (&stab->lock){+.-.}-{2:2}, at: __sock_map_delete+0x43/0xe0 net/core/sock_map.c:417 #7: ffff888045c0c290 (&psock->link_lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] #7: ffff888045c0c290 (&psock->link_lock){+...}-{2:2}, at: sock_map_del_link net/core/sock_map.c:145 [inline] #7: ffff888045c0c290 (&psock->link_lock){+...}-{2:2}, at: sock_map_unref+0xbf/0x6e0 net/core/sock_map.c:180 #8: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #8: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #8: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline] #8: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0xe4/0x420 kernel/trace/bpf_trace.c:2420 stack backtrace: CPU: 2 PID: 5554 Comm: syz-executor.0 Not tainted 6.9.0-rc5-syzkaller-00053-ge33c4963bf53 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 check_deadlock kernel/locking/lockdep.c:3062 [inline] validate_chain kernel/locking/lockdep.c:3856 [inline] __lock_acquire+0x20e6/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] __sock_map_delete+0x43/0xe0 net/core/sock_map.c:417 sock_map_delete_elem+0xb5/0x100 net/core/sock_map.c:449 ___bpf_prog_run+0x3e51/0xabd0 kernel/bpf/core.c:1997 __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236 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+0x151/0x420 kernel/trace/bpf_trace.c:2420 trace_kfree include/trace/events/kmem.h:94 [inline] kfree+0x225/0x390 mm/slub.c:4377 sk_psock_free_link include/linux/skmsg.h:421 [inline] sock_map_del_link net/core/sock_map.c:158 [inline] sock_map_unref+0x392/0x6e0 net/core/sock_map.c:180 __sock_map_delete+0x88/0xe0 net/core/sock_map.c:423 sock_map_delete_elem+0xb5/0x100 net/core/sock_map.c:449 ___bpf_prog_run+0x3e51/0xabd0 kernel/bpf/core.c:1997 __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236 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_run4+0x176/0x460 kernel/trace/bpf_trace.c:2422 __bpf_trace_ext4_ext_show_extent+0x14a/0x190 include/trace/events/ext4.h:1954 trace_ext4_ext_show_extent include/trace/events/ext4.h:1954 [inline] ext4_ext_map_blocks+0xf0a/0x5ce0 fs/ext4/extents.c:4179 ext4_map_blocks+0x61d/0x17d0 fs/ext4/inode.c:623 ext4_iomap_alloc fs/ext4/inode.c:3318 [inline] ext4_iomap_begin+0x47d/0x7d0 fs/ext4/inode.c:3368 iomap_iter+0x49e/0x10b0 fs/iomap/iter.c:91 __iomap_dio_rw+0x6ba/0x1c70 fs/iomap/direct-io.c:659 iomap_dio_rw+0x40/0xa0 fs/iomap/direct-io.c:749 ext4_dio_write_iter fs/ext4/file.c:577 [inline] ext4_file_write_iter+0x136b/0x1a40 fs/ext4/file.c:696 call_write_iter include/linux/fs.h:2110 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x6db/0x1100 fs/read_write.c:590 ksys_write+0x12f/0x260 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f326c07dea9 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:00007f326ce8e0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f326c1abf80 RCX: 00007f326c07dea9 RDX: 0000000000248800 RSI: 0000000020000000 RDI: 000000000000000a RBP: 00007f326c0ca4a4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f326c1abf80 R15: 00007fff1349e168