[syzbot] [udf?] possible deadlock in udf_setsize

[syzbot <syzbot+0333a6f4b88bcd68a62f@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    a38297e3fb01 Linux 6.9
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13228d24980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=edefe34e4544d70e
dashboard link: https://syzkaller.appspot.com/bug?extid=0333a6f4b88bcd68a62f
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-a38297e3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/eb6ef4d9e74f/vmlinux-a38297e3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ce2fb6bcfd40/bzImage-a38297e3.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0333a6f4b88bcd68a62f@syzkaller.appspotmail.com

======================================================
WARNING: possible circular locking dependency detected
6.9.0-syzkaller #0 Not tainted
------------------------------------------------------
kswapd0/110 is trying to acquire lock:
ffff88804a5cbdf0 (mapping.invalidate_lock#4){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:840 [inline]
ffff88804a5cbdf0 (mapping.invalidate_lock#4){++++}-{3:3}, at: udf_setsize+0x256/0x1180 fs/udf/inode.c:1254

but task is already holding lock:
ffffffff8d937180 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x166/0x1a10 mm/vmscan.c:6782

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (fs_reclaim){+.+.}-{0:0}:
       __fs_reclaim_acquire mm/page_alloc.c:3698 [inline]
       fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3712
       might_alloc include/linux/sched/mm.h:312 [inline]
       prepare_alloc_pages.constprop.0+0x155/0x560 mm/page_alloc.c:4346
       __alloc_pages+0x194/0x2460 mm/page_alloc.c:4564
       alloc_pages_mpol+0x275/0x610 mm/mempolicy.c:2264
       folio_alloc+0x1e/0x40 mm/mempolicy.c:2342
       filemap_alloc_folio+0x3ba/0x490 mm/filemap.c:984
       __filemap_get_folio+0x527/0xa90 mm/filemap.c:1926
       filemap_fault+0x610/0x38c0 mm/filemap.c:3299
       __do_fault+0x10a/0x490 mm/memory.c:4531
       do_shared_fault mm/memory.c:4954 [inline]
       do_fault mm/memory.c:5028 [inline]
       do_pte_missing mm/memory.c:3880 [inline]
       handle_pte_fault mm/memory.c:5300 [inline]
       __handle_mm_fault+0x3148/0x4a80 mm/memory.c:5441
       handle_mm_fault+0x476/0xa00 mm/memory.c:5606
       do_user_addr_fault+0x426/0x1030 arch/x86/mm/fault.c:1331
       handle_page_fault arch/x86/mm/fault.c:1474 [inline]
       exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1532
       asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

-> #0 (mapping.invalidate_lock#4){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
       lock_acquire kernel/locking/lockdep.c:5754 [inline]
       lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
       down_write+0x3a/0x50 kernel/locking/rwsem.c:1579
       filemap_invalidate_lock include/linux/fs.h:840 [inline]
       udf_setsize+0x256/0x1180 fs/udf/inode.c:1254
       udf_evict_inode+0x361/0x590 fs/udf/inode.c:144
       evict+0x2ed/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
       dentry_unlink_inode+0x295/0x440 fs/dcache.c:400
       __dentry_kill+0x1d0/0x600 fs/dcache.c:603
       shrink_kill fs/dcache.c:1048 [inline]
       shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1075
       prune_dcache_sb+0xeb/0x150 fs/dcache.c:1156
       super_cache_scan+0x32a/0x550 fs/super.c:221
       do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435
       shrink_slab_memcg mm/shrinker.c:548 [inline]
       shrink_slab+0xa87/0x1310 mm/shrinker.c:626
       shrink_one+0x493/0x7c0 mm/vmscan.c:4774
       shrink_many mm/vmscan.c:4835 [inline]
       lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4935
       shrink_node mm/vmscan.c:5894 [inline]
       kswapd_shrink_node mm/vmscan.c:6704 [inline]
       balance_pgdat+0x10d1/0x1a10 mm/vmscan.c:6895
       kswapd+0x5ea/0xbf0 mm/vmscan.c:7164
       kthread+0x2c1/0x3a0 kernel/kthread.c:388
       ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(fs_reclaim);
                               lock(mapping.invalidate_lock#4);
                               lock(fs_reclaim);
  lock(mapping.invalidate_lock#4);

 *** DEADLOCK ***

2 locks held by kswapd0/110:
 #0: ffffffff8d937180 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x166/0x1a10 mm/vmscan.c:6782
 #1: ffff88801cd260e0 (&type->s_umount_key#57){++++}-{3:3}, at: super_trylock_shared fs/super.c:561 [inline]
 #1: ffff88801cd260e0 (&type->s_umount_key#57){++++}-{3:3}, at: super_cache_scan+0x96/0x550 fs/super.c:196

stack backtrace:
CPU: 2 PID: 110 Comm: kswapd0 Not tainted 6.9.0-syzkaller #0
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 lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 down_write+0x3a/0x50 kernel/locking/rwsem.c:1579
 filemap_invalidate_lock include/linux/fs.h:840 [inline]
 udf_setsize+0x256/0x1180 fs/udf/inode.c:1254
 udf_evict_inode+0x361/0x590 fs/udf/inode.c:144
 evict+0x2ed/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
 dentry_unlink_inode+0x295/0x440 fs/dcache.c:400
 __dentry_kill+0x1d0/0x600 fs/dcache.c:603
 shrink_kill fs/dcache.c:1048 [inline]
 shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1075
 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1156
 super_cache_scan+0x32a/0x550 fs/super.c:221
 do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435
 shrink_slab_memcg mm/shrinker.c:548 [inline]
 shrink_slab+0xa87/0x1310 mm/shrinker.c:626
 shrink_one+0x493/0x7c0 mm/vmscan.c:4774
 shrink_many mm/vmscan.c:4835 [inline]
 lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4935
 shrink_node mm/vmscan.c:5894 [inline]
 kswapd_shrink_node mm/vmscan.c:6704 [inline]
 balance_pgdat+0x10d1/0x1a10 mm/vmscan.c:6895
 kswapd+0x5ea/0xbf0 mm/vmscan.c:7164
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>


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