============================================
WARNING: possible recursive locking detected
6.16.0-rc2-syzkaller-g9aa9b43d689e #0 Not tainted
--------------------------------------------
syz.4.136/7496 is trying to acquire lock:
ffff0000fc824da0 (&oi->ip_alloc_sem){++++}-{4:4}, at: ocfs2_page_mkwrite+0x340/0xbf4 fs/ocfs2/mmap.c:142

but task is already holding lock:
ffff0000fc823f60 (&oi->ip_alloc_sem){++++}-{4:4}, at: ocfs2_fiemap+0x26c/0x9c4 fs/ocfs2/extent_map.c:765

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

       CPU0
       ----
  lock(&oi->ip_alloc_sem);
  lock(&oi->ip_alloc_sem);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

3 locks held by syz.4.136/7496:
 #0: ffff0000fc823f60 (&oi->ip_alloc_sem){++++}-{4:4}, at: ocfs2_fiemap+0x26c/0x9c4 fs/ocfs2/extent_map.c:765
 #1: ffff0000da7b81d0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:431 [inline]
 #1: ffff0000da7b81d0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:188 [inline]
 #1: ffff0000da7b81d0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x38/0x2d8 mm/mmap_lock.c:248
 #2: ffff0000c6770520 (sb_pagefaults#3){.+.+}-{0:0}, at: do_page_mkwrite+0x138/0x2b8 mm/memory.c:3378

stack backtrace:
CPU: 0 UID: 0 PID: 7496 Comm: syz.4.136 Not tainted 6.16.0-rc2-syzkaller-g9aa9b43d689e #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:501 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 print_deadlock_bug+0x2e8/0x2f0 kernel/locking/lockdep.c:3044
 check_deadlock kernel/locking/lockdep.c:3096 [inline]
 validate_chain kernel/locking/lockdep.c:3898 [inline]
 __lock_acquire+0x2940/0x30a4 kernel/locking/lockdep.c:5240
 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5871
 down_write+0x50/0xc0 kernel/locking/rwsem.c:1577
 ocfs2_page_mkwrite+0x340/0xbf4 fs/ocfs2/mmap.c:142
 do_page_mkwrite+0x138/0x2b8 mm/memory.c:3378
 wp_page_shared mm/memory.c:3779 [inline]
 do_wp_page+0x1d34/0x4160 mm/memory.c:3998
 handle_pte_fault mm/memory.c:6105 [inline]
 __handle_mm_fault mm/memory.c:6232 [inline]
 handle_mm_fault+0x10d4/0x4d38 mm/memory.c:6401
 do_page_fault+0x598/0x1554 arch/arm64/mm/fault.c:690
 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:919
 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:455
 el1h_64_sync_handler+0x50/0xcc arch/arm64/kernel/entry-common.c:533
 el1h_64_sync+0x6c/0x70 arch/arm64/kernel/entry.S:595
 __arch_copy_to_user+0x9c/0x240 arch/arm64/lib/copy_template.S:100 (P)
 ocfs2_fiemap+0x648/0x9c4 fs/ocfs2/extent_map.c:806
 ioctl_fiemap fs/ioctl.c:220 [inline]
 do_vfs_ioctl+0x1560/0x1cd8 fs/ioctl.c:841
 __do_sys_ioctl fs/ioctl.c:905 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __arm64_sys_ioctl+0xe4/0x1c4 fs/ioctl.c:893
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600