loop2: detected capacity change from 0 to 1024 ====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc2-next-20250210-syzkaller #0 Not tainted ------------------------------------------------------ syz.2.587/8062 is trying to acquire lock: ffff888033ab68f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0x9e/0x8c0 fs/hfsplus/bitmap.c:35 but task is already holding lock: ffff888028db58c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:458 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730 hfsplus_get_block+0x383/0x14f0 fs/hfsplus/extents.c:260 block_read_full_folio+0x3ee/0xae0 fs/buffer.c:2396 filemap_read_folio+0x148/0x3b0 mm/filemap.c:2402 do_read_cache_folio+0x373/0x5b0 mm/filemap.c:3972 do_read_cache_page mm/filemap.c:4038 [inline] read_cache_page+0x5b/0x170 mm/filemap.c:4047 read_mapping_page include/linux/pagemap.h:1017 [inline] hfsplus_block_allocate+0xee/0x8c0 fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0xade/0x1b70 fs/hfsplus/extents.c:469 hfsplus_get_block+0x406/0x14f0 fs/hfsplus/extents.c:245 __block_write_begin_int+0x692/0x19a0 fs/buffer.c:2116 block_write_begin fs/buffer.c:2226 [inline] cont_write_begin+0x77f/0xb40 fs/buffer.c:2577 hfsplus_write_begin+0x68/0xb0 fs/hfsplus/inode.c:46 cont_expand_zero fs/buffer.c:2504 [inline] cont_write_begin+0x32b/0xb40 fs/buffer.c:2567 hfsplus_write_begin+0x68/0xb0 fs/hfsplus/inode.c:46 generic_cont_expand_simple+0x18f/0x2b0 fs/buffer.c:2468 hfsplus_setattr+0x16d/0x270 fs/hfsplus/inode.c:258 notify_change+0xbca/0xe90 fs/attr.c:552 do_truncate+0x220/0x310 fs/open.c:65 do_ftruncate+0x4b4/0x590 fs/open.c:192 do_sys_ftruncate fs/open.c:207 [inline] __do_sys_ftruncate fs/open.c:212 [inline] __se_sys_ftruncate fs/open.c:210 [inline] __x64_sys_ftruncate+0x93/0xf0 fs/open.c:210 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sbi->alloc_mutex){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730 hfsplus_block_allocate+0x9e/0x8c0 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xade/0x1b70 fs/hfsplus/extents.c:469 hfsplus_get_block+0x406/0x14f0 fs/hfsplus/extents.c:245 __block_write_begin_int+0x692/0x19a0 fs/buffer.c:2116 block_write_begin fs/buffer.c:2226 [inline] cont_write_begin+0x77f/0xb40 fs/buffer.c:2577 hfsplus_write_begin+0x68/0xb0 fs/hfsplus/inode.c:46 cont_expand_zero fs/buffer.c:2504 [inline] cont_write_begin+0x32b/0xb40 fs/buffer.c:2567 hfsplus_write_begin+0x68/0xb0 fs/hfsplus/inode.c:46 generic_cont_expand_simple+0x18f/0x2b0 fs/buffer.c:2468 hfsplus_setattr+0x16d/0x270 fs/hfsplus/inode.c:258 notify_change+0xbca/0xe90 fs/attr.c:552 do_truncate+0x220/0x310 fs/open.c:65 vfs_truncate+0x494/0x520 fs/open.c:115 do_sys_truncate+0xd6/0x190 fs/open.c:138 __do_sys_truncate fs/open.c:150 [inline] __se_sys_truncate fs/open.c:148 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:148 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f 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.2.587/8062: #0: ffff888059d24420 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:556 #1: ffff888028db5ab8 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff888028db5ab8 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: do_truncate+0x20c/0x310 fs/open.c:63 #2: ffff888028db58c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:458 stack backtrace: CPU: 0 UID: 0 PID: 8062 Comm: syz.2.587 Not tainted 6.14.0-rc2-next-20250210-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208 check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730 hfsplus_block_allocate+0x9e/0x8c0 fs/hfsplus/bitmap.c:35 hfsplus_file_extend+0xade/0x1b70 fs/hfsplus/extents.c:469 hfsplus_get_block+0x406/0x14f0 fs/hfsplus/extents.c:245 __block_write_begin_int+0x692/0x19a0 fs/buffer.c:2116 block_write_begin fs/buffer.c:2226 [inline] cont_write_begin+0x77f/0xb40 fs/buffer.c:2577 hfsplus_write_begin+0x68/0xb0 fs/hfsplus/inode.c:46 cont_expand_zero fs/buffer.c:2504 [inline] cont_write_begin+0x32b/0xb40 fs/buffer.c:2567 hfsplus_write_begin+0x68/0xb0 fs/hfsplus/inode.c:46 generic_cont_expand_simple+0x18f/0x2b0 fs/buffer.c:2468 hfsplus_setattr+0x16d/0x270 fs/hfsplus/inode.c:258 notify_change+0xbca/0xe90 fs/attr.c:552 do_truncate+0x220/0x310 fs/open.c:65 vfs_truncate+0x494/0x520 fs/open.c:115 do_sys_truncate+0xd6/0x190 fs/open.c:138 __do_sys_truncate fs/open.c:150 [inline] __se_sys_truncate fs/open.c:148 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:148 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6db698cde9 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:00007f6db47f6038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007f6db6ba5fa0 RCX: 00007f6db698cde9 RDX: 0000000000000000 RSI: 000000000000a643 RDI: 0000400000000200 RBP: 00007f6db6a0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6db6ba5fa0 R15: 00007fffbe05d238