==================================================================
BUG: KASAN: use-after-free in dbJoin+0x295/0x2b0 fs/jfs/jfs_dmap.c:2807
Read of size 1 at addr ffff88817dde9061 by task jfsCommit/110

CPU: 1 UID: 0 PID: 110 Comm: jfsCommit Not tainted 6.12.0-rc3-syzkaller-00087-gc964ced77262 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:488
 kasan_report+0xd9/0x110 mm/kasan/report.c:601
 dbJoin+0x295/0x2b0 fs/jfs/jfs_dmap.c:2807
 dbFreeBits+0x15c/0x8f0 fs/jfs/jfs_dmap.c:2340
 dbFreeDmap+0x62/0x1b0 fs/jfs/jfs_dmap.c:2089
 dbFree+0x266/0x550 fs/jfs/jfs_dmap.c:409
 txFreeMap+0x788/0xe60 fs/jfs/jfs_txnmgr.c:2515
 xtTruncate+0x1e57/0x2c80 fs/jfs/jfs_xtree.c:2467
 jfs_free_zero_link+0x372/0x4f0 fs/jfs/namei.c:759
 jfs_evict_inode+0x423/0x4b0 fs/jfs/inode.c:153
 evict+0x40c/0x970 fs/inode.c:725
 iput_final fs/inode.c:1877 [inline]
 iput fs/inode.c:1903 [inline]
 iput+0x530/0x890 fs/inode.c:1889
 txUpdateMap+0x99d/0xb80 fs/jfs/jfs_txnmgr.c:2367
 txLazyCommit fs/jfs/jfs_txnmgr.c:2664 [inline]
 jfs_lazycommit+0x5e6/0xb20 fs/jfs/jfs_txnmgr.c:2733
 kthread+0x2c4/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x17dde9
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000000000 ffffea0005f77a48 ffffea0005f77a48 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffff88817dde8f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88817dde8f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88817dde9000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                       ^
 ffff88817dde9080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88817dde9100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
------------[ cut here ]------------
WARNING: CPU: 0 PID: 110 at fs/jfs/jfs_dmap.c:2875 dbAdjTree+0x2d9/0x3d0 fs/jfs/jfs_dmap.c:2875
Modules linked in:
CPU: 0 UID: 0 PID: 110 Comm: jfsCommit Tainted: G    B              6.12.0-rc3-syzkaller-00087-gc964ced77262 #0
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:dbAdjTree+0x2d9/0x3d0 fs/jfs/jfs_dmap.c:2875
Code: e8 7c 45 7f fe 0f b6 14 24 38 da 0f 85 a1 fe ff ff 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f e9 3d 44 7f fe e8 38 44 7f fe 90 <0f> 0b 90 eb e2 e8 ad df df fe e9 52 fe ff ff e8 a3 df df fe e9 79
RSP: 0018:ffffc90002d9f620 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000155 RCX: ffffffff830e3b11
RDX: ffff88801efc3c00 RSI: ffffffff830e3d58 RDI: 0000000000000005
RBP: ffff88807ed39010 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ff0b0000 R11: 6e696c6261736944 R12: 0000000000000005
R13: 00000000ff0b0000 R14: ffff88807ed39010 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fabcbe97bd0 CR3: 0000000032b0e000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 dbJoin+0x24b/0x2b0 fs/jfs/jfs_dmap.c:2843
 dbFreeBits+0x15c/0x8f0 fs/jfs/jfs_dmap.c:2340
 dbFreeDmap+0x62/0x1b0 fs/jfs/jfs_dmap.c:2089
 dbFree+0x266/0x550 fs/jfs/jfs_dmap.c:409
 txFreeMap+0x788/0xe60 fs/jfs/jfs_txnmgr.c:2515
 xtTruncate+0x1e57/0x2c80 fs/jfs/jfs_xtree.c:2467
 jfs_free_zero_link+0x372/0x4f0 fs/jfs/namei.c:759
 jfs_evict_inode+0x423/0x4b0 fs/jfs/inode.c:153
 evict+0x40c/0x970 fs/inode.c:725
 iput_final fs/inode.c:1877 [inline]
 iput fs/inode.c:1903 [inline]
 iput+0x530/0x890 fs/inode.c:1889
 txUpdateMap+0x99d/0xb80 fs/jfs/jfs_txnmgr.c:2367
 txLazyCommit fs/jfs/jfs_txnmgr.c:2664 [inline]
 jfs_lazycommit+0x5e6/0xb20 fs/jfs/jfs_txnmgr.c:2733
 kthread+0x2c4/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>