loop0: detected capacity change from 0 to 32768
BTRFS: device fsid c9fe44da-de57-406a-8241-57ec7d4412cf devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5325)
BTRFS info (device loop0): first mount of filesystem c9fe44da-de57-406a-8241-57ec7d4412cf
BTRFS info (device loop0): using crc32c checksum algorithm
BTRFS info (device loop0): enabling ssd optimizations
BTRFS info (device loop0): turning on async discard
BTRFS info (device loop0): enabling free space tree
------------[ cut here ]------------
btrfs_abort_should_print_stack(__error)
WARNING: fs/btrfs/inode.c:6950 at btrfs_add_link+0x932/0xa50 fs/btrfs/inode.c:6950, CPU#0: syz.0.0/5325
Modules linked in:
CPU: 0 UID: 0 PID: 5325 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:btrfs_add_link+0x932/0xa50 fs/btrfs/inode.c:6950
Code: e2 74 13 41 83 fe fb 74 14 41 83 fe f4 75 15 e8 84 3d ab fd eb 17 e8 7d 3d ab fd eb 10 e8 76 3d ab fd eb 09 e8 6f 3d ab fd 90 <0f> 0b 90 44 89 f1 f7 d9 e9 10 fe ff ff 89 df 48 c7 c6 c0 e7 3d 8f
RSP: 0018:ffffc9000e1af880 EFLAGS: 00010293
RAX: ffffffff841cafa1 RBX: ffff888052904001 RCX: ffff888034952580
RDX: 0000000000000000 RSI: ffffffff8f3de760 RDI: 00000000ffffffe4
RBP: ffffc9000e1af9b0 R08: ffff888034952580 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: 1ffff110087bba64
R13: 00000000ffffffe4 R14: 00000000ffffffe4 R15: ffff888043ddd320
FS:  00007ff6106056c0(0000) GS:ffff88808c2be000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4ac525fe9c CR3: 00000000123b7000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 btrfs_create_new_inode+0x14a1/0x1ee0 fs/btrfs/inode.c:6883
 btrfs_create_common+0x189/0x310 fs/btrfs/inode.c:7009
 btrfs_mkdir+0xc1/0xf0 fs/btrfs/inode.c:7148
 vfs_mkdir+0x40c/0x620 fs/namei.c:5410
 filename_mkdirat+0x285/0x510 fs/namei.c:5443
 __do_sys_mkdirat fs/namei.c:5464 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5461
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff60f79e159
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:00007ff610604fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007ff60fa25fa0 RCX: 00007ff60f79e159
RDX: 00000000000001ff RSI: 0000200000000000 RDI: ffffffffffffff9c
RBP: 00007ff60f83506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff60fa26038 R14: 00007ff60fa25fa0 R15: 00007ffcf5917988
 </TASK>