==================================================================
BUG: KASAN: use-after-free in dbJoin+0x295/0x2b0 fs/jfs/jfs_dmap.c:2805
Read of size 1 at addr ffff88817d103061 by task jfsCommit/112

CPU: 1 PID: 112 Comm: jfsCommit Not tainted 6.10.0-rc7-syzkaller-00025-ga19ea421490d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 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:2805
 dbFreeBits+0x15c/0x8f0 fs/jfs/jfs_dmap.c:2338
 dbFreeDmap+0x62/0x1b0 fs/jfs/jfs_dmap.c:2087
 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+0x2f0/0x6c0 fs/inode.c:667
 iput_final fs/inode.c:1741 [inline]
 iput.part.0+0x5a8/0x7f0 fs/inode.c:1767
 iput+0x5c/0x80 fs/inode.c:1757
 txUpdateMap+0xaf3/0xd20 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:0x17d103
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000000000 ffffea0005f440c8 ffffea0005f440c8 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:
 ffff88817d102f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88817d102f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88817d103000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                       ^
 ffff88817d103080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88817d103100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
------------[ cut here ]------------
WARNING: CPU: 1 PID: 112 at fs/jfs/jfs_dmap.c:2873 dbAdjTree+0x2d9/0x3d0 fs/jfs/jfs_dmap.c:2873
Modules linked in:
CPU: 1 PID: 112 Comm: jfsCommit Tainted: G    B              6.10.0-rc7-syzkaller-00025-ga19ea421490d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:dbAdjTree+0x2d9/0x3d0 fs/jfs/jfs_dmap.c:2873
Code: e8 1c c9 86 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 1d cf 86 fe e8 18 cf 86 fe 90 <0f> 0b 90 eb e2 e8 cd 3c e3 fe e9 52 fe ff ff e8 c3 3c e3 fe e9 79
RSP: 0018:ffffc90002ccf6b0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000155 RCX: ffffffff83085c51
RDX: ffff88801a7dbc00 RSI: ffffffff83085e98 RDI: 0000000000000005
RBP: ffff88807e053010 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ff0b0000 R11: 6e696c6261736944 R12: 0000000000000005
R13: 00000000ff0b0000 R14: ffff88807e053010 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e4f7ff8 CR3: 000000007dda0000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 dbJoin+0x24b/0x2b0 fs/jfs/jfs_dmap.c:2841
 dbFreeBits+0x15c/0x8f0 fs/jfs/jfs_dmap.c:2338
 dbFreeDmap+0x62/0x1b0 fs/jfs/jfs_dmap.c:2087
 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+0x2f0/0x6c0 fs/inode.c:667
 iput_final fs/inode.c:1741 [inline]
 iput.part.0+0x5a8/0x7f0 fs/inode.c:1767
 iput+0x5c/0x80 fs/inode.c:1757
 txUpdateMap+0xaf3/0xd20 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>