------------[ cut here ]------------
VFS: brelse: Trying to free free buffer
WARNING: CPU: 0 PID: 5324 at fs/buffer.c:1229 __brelse fs/buffer.c:1229 [inline]
WARNING: CPU: 0 PID: 5324 at fs/buffer.c:1229 brelse include/linux/buffer_head.h:324 [inline]
WARNING: CPU: 0 PID: 5324 at fs/buffer.c:1229 bh_lru_install fs/buffer.c:1346 [inline]
WARNING: CPU: 0 PID: 5324 at fs/buffer.c:1229 __find_get_block+0x109d/0x1150 fs/buffer.c:1400
Modules linked in:
CPU: 0 UID: 0 PID: 5324 Comm: syz.0.0 Not tainted 6.13.0-rc4-syzkaller-00004-gf07044dd0df0 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__brelse fs/buffer.c:1229 [inline]
RIP: 0010:brelse include/linux/buffer_head.h:324 [inline]
RIP: 0010:bh_lru_install fs/buffer.c:1346 [inline]
RIP: 0010:__find_get_block+0x109d/0x1150 fs/buffer.c:1400
Code: 07 40 9a e8 c5 5b dc ff e9 1b f7 ff ff e8 3b f4 75 ff e9 87 f7 ff ff e8 31 f4 75 ff 90 48 c7 c7 e0 03 19 8c e8 e4 97 36 ff 90 <0f> 0b 90 90 e9 6b f7 ff ff e8 15 f4 75 ff 48 c7 c7 00 e2 a8 8e 4c
RSP: 0018:ffffc9000d1b7340 EFLAGS: 00010246
RAX: c123707b929c9100 RBX: 0000000000000000 RCX: ffff888000efa440
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000d1b7470 R08: ffffffff81601a82 R09: 1ffff11003f8519a
R10: dffffc0000000000 R11: ffffed1003f8519b R12: ffff8880455283a0
R13: ffff88801fc398b0 R14: ffff8880455280e8 R15: ffff8880433984e8
FS:  00007f7c4fdef6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7c4fdeefe0 CR3: 0000000043f06000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bdev_getblk+0x33/0x670 fs/buffer.c:1425
 __getblk include/linux/buffer_head.h:380 [inline]
 sb_getblk include/linux/buffer_head.h:386 [inline]
 exfat_zeroed_cluster+0x259/0x660 fs/exfat/fatent.c:288
 exfat_find_empty_entry+0xc33/0x1a10 fs/exfat/namei.c:359
 exfat_add_entry+0x409/0xaa0 fs/exfat/namei.c:496
 exfat_mkdir+0x1c7/0x580 fs/exfat/namei.c:858
 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4311
 do_mkdirat+0x264/0x3a0 fs/namei.c:4334
 __do_sys_mkdirat fs/namei.c:4349 [inline]
 __se_sys_mkdirat fs/namei.c:4347 [inline]
 __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4347
 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: 0033:0x7f7c4ef85d29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7c4fdef038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f7c4f176160 RCX: 00007f7c4ef85d29
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 000000000000000a
RBP: 00007f7c4f001aa8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7c4f176160 R15: 00007ffecaa2c958
 </TASK>