loop1: detected capacity change from 0 to 1024
======================================================
WARNING: possible circular locking dependency detected
6.1.92-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.1/6672 is trying to acquire lock:
ffff0000d65090f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_free+0xcc/0x4b0 fs/hfsplus/bitmap.c:182
but task is already holding lock:
ffff0000f39e3048 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x250/0x9b8 fs/hfsplus/extents.c:576
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}:
__mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
hfsplus_get_block+0x2c4/0x1168 fs/hfsplus/extents.c:260
block_read_full_folio+0x2f4/0x98c fs/buffer.c:2271
hfsplus_read_folio+0x28/0x38 fs/hfsplus/inode.c:28
filemap_read_folio+0x14c/0x39c mm/filemap.c:2461
do_read_cache_folio+0x24c/0x544 mm/filemap.c:3598
do_read_cache_page mm/filemap.c:3640 [inline]
read_cache_page+0x6c/0x180 mm/filemap.c:3649
read_mapping_page include/linux/pagemap.h:791 [inline]
hfsplus_block_allocate+0xe0/0x818 fs/hfsplus/bitmap.c:37
hfsplus_file_extend+0x770/0x14cc fs/hfsplus/extents.c:468
hfsplus_get_block+0x398/0x1168 fs/hfsplus/extents.c:245
__block_write_begin_int+0x340/0x13b4 fs/buffer.c:1991
__block_write_begin fs/buffer.c:2041 [inline]
block_write_begin fs/buffer.c:2102 [inline]
cont_write_begin+0x5c0/0x7d8 fs/buffer.c:2456
hfsplus_write_begin+0x98/0xe4 fs/hfsplus/inode.c:52
page_symlink+0x278/0x4a4 fs/namei.c:5220
hfsplus_symlink+0xc0/0x224 fs/hfsplus/dir.c:449
vfs_symlink+0x244/0x3a8 fs/namei.c:4473
do_symlinkat+0x1bc/0x45c fs/namei.c:4502
__do_sys_symlinkat fs/namei.c:4519 [inline]
__se_sys_symlinkat fs/namei.c:4516 [inline]
__arm64_sys_symlinkat+0xa4/0xbc fs/namei.c:4516
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
-> #0 (&sbi->alloc_mutex){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain kernel/locking/lockdep.c:3825 [inline]
__lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049
lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662
__mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
hfsplus_block_free+0xcc/0x4b0 fs/hfsplus/bitmap.c:182
hfsplus_free_extents+0x148/0x8d4 fs/hfsplus/extents.c:363
hfsplus_file_truncate+0x698/0x9b8 fs/hfsplus/extents.c:591
hfsplus_setattr+0x18c/0x25c fs/hfsplus/inode.c:269
notify_change+0xb58/0xe1c fs/attr.c:499
do_truncate+0x1c0/0x28c fs/open.c:65
vfs_truncate+0x2c4/0x36c fs/open.c:111
do_sys_truncate+0xec/0x1b4 fs/open.c:134
__do_sys_truncate fs/open.c:146 [inline]
__se_sys_truncate fs/open.c:144 [inline]
__arm64_sys_truncate+0x5c/0x70 fs/open.c:144
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&HFSPLUS_I(inode)->extents_lock);
lock(&sbi->alloc_mutex);
lock(&HFSPLUS_I(inode)->extents_lock);
lock(&sbi->alloc_mutex);
*** DEADLOCK ***
3 locks held by syz-executor.1/6672:
#0: ffff0000d2b5e460 (sb_writers#11){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:393
#1: ffff0000f39e3240 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
#1: ffff0000f39e3240 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}, at: do_truncate+0x1ac/0x28c fs/open.c:63
#2: ffff0000f39e3048 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x250/0x9b8 fs/hfsplus/extents.c:576
stack backtrace:
CPU: 0 PID: 6672 Comm: syz-executor.1 Not tainted 6.1.92-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call trace:
dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
dump_stack+0x1c/0x5c lib/dump_stack.c:113
print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2048
check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2170
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain kernel/locking/lockdep.c:3825 [inline]
__lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049
lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662
__mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
hfsplus_block_free+0xcc/0x4b0 fs/hfsplus/bitmap.c:182
hfsplus_free_extents+0x148/0x8d4 fs/hfsplus/extents.c:363
hfsplus_file_truncate+0x698/0x9b8 fs/hfsplus/extents.c:591
hfsplus_setattr+0x18c/0x25c fs/hfsplus/inode.c:269
notify_change+0xb58/0xe1c fs/attr.c:499
do_truncate+0x1c0/0x28c fs/open.c:65
vfs_truncate+0x2c4/0x36c fs/open.c:111
do_sys_truncate+0xec/0x1b4 fs/open.c:134
__do_sys_truncate fs/open.c:146 [inline]
__se_sys_truncate fs/open.c:144 [inline]
__arm64_sys_truncate+0x5c/0x70 fs/open.c:144
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585