======================================================
WARNING: possible circular locking dependency detected
6.16.0-rc4-syzkaller-00286-gc435a4f487e8-dirty #0 Not tainted
------------------------------------------------------
syz.5.3951/16088 is trying to acquire lock:
ffff888038db36e0 (mapping.invalidate_lock#17){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x129/0x7b0

but task is already holding lock:
ffff88801ea7c260 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x300

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&mm->mmap_lock){++++}-{4:4}:
       lock_acquire+0x120/0x360
       __might_fault+0xcc/0x130
       _copy_to_user+0x2c/0xb0
       fiemap_fill_next_extent+0x1c0/0x390
       ocfs2_fiemap+0x9dc/0xc90
       do_vfs_ioctl+0x16d3/0x1990
       __se_sys_ioctl+0x82/0x170
       do_syscall_64+0xfa/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}:
       lock_acquire+0x120/0x360
       down_read+0x46/0x2e0
       ocfs2_read_folio+0x353/0x970
       filemap_read_folio+0x117/0x380
       filemap_fault+0xb16/0x1200
       ocfs2_fault+0xa4/0x3f0
       __do_fault+0x138/0x390
       __handle_mm_fault+0x37ed/0x5620
       handle_mm_fault+0x40a/0x8e0
       do_user_addr_fault+0x764/0x1390
       exc_page_fault+0x76/0xf0
       asm_exc_page_fault+0x26/0x30
       rep_movs_alternative+0xf/0x90
       _copy_from_user+0x7a/0xb0
       snd_rawmidi_kernel_write1+0x3ab/0x650
       snd_rawmidi_write+0x5ad/0xbd0
       vfs_writev+0x4b6/0x960
       do_writev+0x14d/0x2d0
       do_syscall_64+0xfa/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (mapping.invalidate_lock#17){.+.+}-{4:4}:
       validate_chain+0xb9b/0x2140
       __lock_acquire+0xab9/0xd20
       lock_acquire+0x120/0x360
       down_read+0x46/0x2e0
       page_cache_ra_unbounded+0x129/0x7b0
       do_sync_mmap_readahead+0x4b5/0x5f0
       filemap_fault+0x62a/0x1200
       ocfs2_fault+0xa4/0x3f0
       __do_fault+0x138/0x390
       __handle_mm_fault+0x37ed/0x5620
       handle_mm_fault+0x40a/0x8e0
       do_user_addr_fault+0x764/0x1390
       exc_page_fault+0x76/0xf0
       asm_exc_page_fault+0x26/0x30
       rep_movs_alternative+0xf/0x90
       _copy_from_user+0x7a/0xb0
       snd_rawmidi_kernel_write1+0x3ab/0x650
       snd_rawmidi_write+0x5ad/0xbd0
       vfs_writev+0x4b6/0x960
       do_writev+0x14d/0x2d0
       do_syscall_64+0xfa/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  mapping.invalidate_lock#17 --> &ocfs2_file_ip_alloc_sem_key --> &mm->mmap_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  rlock(&mm->mmap_lock);
                               lock(&ocfs2_file_ip_alloc_sem_key);
                               lock(&mm->mmap_lock);
  rlock(mapping.invalidate_lock#17);

 *** DEADLOCK ***

1 lock held by syz.5.3951/16088:
 #0: ffff88801ea7c260 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x300

stack backtrace:
CPU: 0 UID: 0 PID: 16088 Comm: syz.5.3951 Not tainted 6.16.0-rc4-syzkaller-00286-gc435a4f487e8-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_circular_bug+0x2ee/0x310
 check_noncircular+0x134/0x160
 validate_chain+0xb9b/0x2140
 __lock_acquire+0xab9/0xd20
 lock_acquire+0x120/0x360
 down_read+0x46/0x2e0
 page_cache_ra_unbounded+0x129/0x7b0
 do_sync_mmap_readahead+0x4b5/0x5f0
 filemap_fault+0x62a/0x1200
 ocfs2_fault+0xa4/0x3f0
 __do_fault+0x138/0x390
 __handle_mm_fault+0x37ed/0x5620
 handle_mm_fault+0x40a/0x8e0
 do_user_addr_fault+0x764/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:rep_movs_alternative+0xf/0x90
Code: c4 10 c3 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 83 f9 40 73 44 83 f9 08 73 25 85 c9 74 0f <8a> 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 e9 7d 00 04 00 66 2e
RSP: 0018:ffffc90008a07978 EFLAGS: 00010202
RAX: 00007ffffffff001 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000200000008257 RDI: ffff8880393b4f97
RBP: 0000000000007069 R08: ffff8880393b4f97 R09: 1ffff110072769f2
R10: dffffc0000000000 R11: ffffed10072769f3 R12: 0000000000000000
R13: 0000000000000001 R14: ffff8880393b4f97 R15: 0000200000008257
 _copy_from_user+0x7a/0xb0
 snd_rawmidi_kernel_write1+0x3ab/0x650
 snd_rawmidi_write+0x5ad/0xbd0
 vfs_writev+0x4b6/0x960
 do_writev+0x14d/0x2d0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f021418e929
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:00007f0214fad038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f02143b5fa0 RCX: 00007f021418e929
RDX: 0000000000000002 RSI: 0000200000000840 RDI: 0000000000000004
RBP: 00007f0214210b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f02143b5fa0 R15: 00007ffebdecce68
 </TASK>
