ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt
ERROR: (device loop0): remounting filesystem as read-only
ERROR: (device loop0): duplicateIXtree: 
============================================
WARNING: possible recursive locking detected
6.14.0-syzkaller-02665-g1e26c5e28ca5 #0 Not tainted
--------------------------------------------
syz.0.0/5318 is trying to acquire lock:
ffff888044248920 (&(imap->im_aglock[index])){+.+.}-{4:4}, at: diFree+0x37f/0x2fc0 fs/jfs/jfs_imap.c:889

but task is already holding lock:
ffff888044248920 (&(imap->im_aglock[index])){+.+.}-{4:4}, at: diAlloc+0x1bf/0x1680 fs/jfs/jfs_imap.c:-1

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&(imap->im_aglock[index]));
  lock(&(imap->im_aglock[index]));

 *** DEADLOCK ***

 May be due to missing lock nesting notation

5 locks held by syz.0.0/5318:
 #0: ffff88804257a420 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:556
 #1: ffff888044613390 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:902 [inline]
 #1: ffff888044613390 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: filename_create+0x266/0x490 fs/namei.c:4097
 #2: ffff888044248920 (&(imap->im_aglock[index])){+.+.}-{4:4}, at: diAlloc+0x1bf/0x1680 fs/jfs/jfs_imap.c:-1
 #3: ffff888044248890 (&imap->im_freelock){+.+.}-{4:4}, at: diNewIAG fs/jfs/jfs_imap.c:2460 [inline]
 #3: ffff888044248890 (&imap->im_freelock){+.+.}-{4:4}, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline]
 #3: ffff888044248890 (&imap->im_freelock){+.+.}-{4:4}, at: diAllocAG+0x4e4/0x2100 fs/jfs/jfs_imap.c:1669
 #4: ffff888044612618 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diNewIAG fs/jfs/jfs_imap.c:2477 [inline]
 #4: ffff888044612618 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline]
 #4: ffff888044612618 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diAllocAG+0xbb2/0x2100 fs/jfs/jfs_imap.c:1669

stack backtrace:
CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted 6.14.0-syzkaller-02665-g1e26c5e28ca5 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_deadlock_bug+0x2be/0x2d0 kernel/locking/lockdep.c:3042
 check_deadlock kernel/locking/lockdep.c:3094 [inline]
 validate_chain+0x928/0x24e0 kernel/locking/lockdep.c:3896
 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235
 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
 __mutex_lock_common kernel/locking/mutex.c:587 [inline]
 __mutex_lock+0x1bf/0x1000 kernel/locking/mutex.c:732
 diFree+0x37f/0x2fc0 fs/jfs/jfs_imap.c:889
 jfs_evict_inode+0x330/0x440 fs/jfs/inode.c:156
 evict+0x4f9/0x9b0 fs/inode.c:810
 diFreeSpecial fs/jfs/jfs_imap.c:552 [inline]
 duplicateIXtree+0x3cf/0x550 fs/jfs/jfs_imap.c:3022
 diNewIAG fs/jfs/jfs_imap.c:2597 [inline]
 diAllocExt fs/jfs/jfs_imap.c:1905 [inline]
 diAllocAG+0x1a7c/0x2100 fs/jfs/jfs_imap.c:1669
 diAlloc+0x1db/0x1680 fs/jfs/jfs_imap.c:1590
 ialloc+0x8f/0x8c0 fs/jfs/jfs_inode.c:56
 jfs_mkdir+0x1c7/0xbb0 fs/jfs/namei.c:225
 vfs_mkdir+0x2f9/0x500 fs/namei.c:4324
 do_mkdirat+0x273/0x3f0 fs/namei.c:4357
 __do_sys_mkdirat fs/namei.c:4374 [inline]
 __se_sys_mkdirat fs/namei.c:4372 [inline]
 __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4372
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f043e98d169
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:00007f043f8aa038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f043eba6080 RCX: 00007f043e98d169
RDX: 0000000000000000 RSI: 00002000000005c0 RDI: ffffffffffffff9c
RBP: 00007f043ea0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f043eba6080 R15: 00007ffc3651eb38
 </TASK>