syzbot

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jbd2_handle_buffer_credits(handle) <= 0
WARNING: fs/jbd2/transaction.c:1563 at jbd2_journal_dirty_metadata+0x8e6/0xc30 fs/jbd2/transaction.c:1563, CPU#0: syz.0.0/5323
Modules linked in:
CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:jbd2_journal_dirty_metadata+0x8e6/0xc30 fs/jbd2/transaction.c:1563
Code: 8b 44 24 40 4d 89 f9 50 53 41 55 41 54 e8 b2 78 8f fe 48 83 c4 20 90 0f 0b 90 bb ea ff ff ff e9 35 fe ff ff e8 4b 4e 2c ff 90 <0f> 0b 90 bb e4 ff ff ff e9 22 fe ff ff 48 8b 44 24 30 48 83 c0 18
RSP: 0018:ffffc9000c2de8b8 EFLAGS: 00010283
RAX: ffffffff829838a5 RBX: 1ffff1100ab2fd15 RCX: 0000000000100000
RDX: ffffc90021003000 RSI: 0000000000003012 RDI: 0000000000003013
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200185bd08 R12: ffff88801c8cff68
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff11003919fea
FS:  00007febd27736c0(0000) GS:ffff88808ccea000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007febd1c047b8 CR3: 00000000129d0000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_journal_dirty+0x130/0x6e0 fs/ocfs2/journal.c:834
 ocfs2_add_branch fs/ocfs2/alloc.c:1326 [inline]
 ocfs2_grow_tree+0x2d72/0x4010 fs/ocfs2/alloc.c:1586
 ocfs2_split_and_insert+0x409/0x13d0 fs/ocfs2/alloc.c:4951
 ocfs2_split_extent+0x1695/0x1eb0 fs/ocfs2/alloc.c:5133
 ocfs2_change_extent_flag+0xab4/0xdd0 fs/ocfs2/alloc.c:5230
 ocfs2_mark_extent_refcounted fs/ocfs2/refcounttree.c:2349 [inline]
 ocfs2_add_refcount_flag+0x658/0xe20 fs/ocfs2/refcounttree.c:3693
 ocfs2_reflink_remap_extent fs/ocfs2/refcounttree.c:4555 [inline]
 ocfs2_reflink_remap_blocks+0xbb2/0x1a30 fs/ocfs2/refcounttree.c:4682
 ocfs2_remap_file_range+0x451/0x6f0 fs/ocfs2/file.c:2746
 vfs_copy_file_range+0xd80/0x1370 fs/read_write.c:1598
 __do_sys_copy_file_range fs/read_write.c:1681 [inline]
 __se_sys_copy_file_range+0x2fb/0x480 fs/read_write.c:1648
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7febd199aeb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007febd2773028 EFLAGS: 00000246 ORIG_RAX: 0000000000000146
RAX: ffffffffffffffda RBX: 00007febd1c16090 RCX: 00007febd199aeb9
RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007febd1a08c1f R08: fffffbffa003e45b R09: 0700000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007febd1c16128 R14: 00007febd1c16090 R15: 00007ffe9f5a2c78
 </TASK>