[syzbot] [udf?] possible deadlock in udf_setsize

[syzbot]

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+0333a6...@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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