loop6: detected capacity change from 0 to 1024 ============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- syz.6.315/7155 is trying to acquire lock: ffff88807edcd8c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x272/0xaa0 fs/hfsplus/extents.c:260 but task is already holding lock: ffff88807edca988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x211/0xcb0 fs/hfsplus/extents.c:573 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&HFSPLUS_I(inode)->extents_lock); lock(&HFSPLUS_I(inode)->extents_lock); *** DEADLOCK *** May be due to missing lock nesting notation 4 locks held by syz.6.315/7155: #0: ffff888024ee8420 (sb_writers#18){.+.+}-{0:0}, at: do_open fs/namei.c:3968 [inline] #0: ffff888024ee8420 (sb_writers#18){.+.+}-{0:0}, at: path_openat+0x22f4/0x2cb0 fs/namei.c:4134 #1: ffff88807edcab78 (&sb->s_type->i_mutex_key#27){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:985 [inline] #1: ffff88807edcab78 (&sb->s_type->i_mutex_key#27){+.+.}-{4:4}, at: do_truncate+0x146/0x230 fs/open.c:63 #2: ffff88807edca988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x211/0xcb0 fs/hfsplus/extents.c:573 #3: ffff88801b7910f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_free+0xeb/0x680 fs/hfsplus/bitmap.c:182 stack backtrace: CPU: 1 UID: 0 PID: 7155 Comm: syz.6.315 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_deadlock_bug+0x1e9/0x240 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain kernel/locking/lockdep.c:3895 [inline] __lock_acquire+0x1106/0x1c90 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x193/0x1060 kernel/locking/mutex.c:760 hfsplus_get_block+0x272/0xaa0 fs/hfsplus/extents.c:260 block_read_full_folio+0x457/0x850 fs/buffer.c:2420 filemap_read_folio+0xc8/0x2a0 mm/filemap.c:2444 do_read_cache_folio+0x263/0x5c0 mm/filemap.c:4024 do_read_cache_page mm/filemap.c:4090 [inline] read_cache_page+0x5b/0x160 mm/filemap.c:4099 read_mapping_page include/linux/pagemap.h:993 [inline] hfsplus_block_free+0x14e/0x680 fs/hfsplus/bitmap.c:185 hfsplus_free_extents+0x34e/0x4b0 fs/hfsplus/extents.c:360 hfsplus_file_truncate+0x9df/0xcb0 fs/hfsplus/extents.c:588 hfsplus_setattr+0x19f/0x320 fs/hfsplus/inode.c:266 notify_change+0x6d2/0x12a0 fs/attr.c:546 do_truncate+0x1d7/0x230 fs/open.c:68 handle_truncate fs/namei.c:3596 [inline] do_open fs/namei.c:3979 [inline] path_openat+0x2678/0x2cb0 fs/namei.c:4134 do_filp_open+0x20b/0x470 fs/namei.c:4161 do_sys_openat2+0x11b/0x1d0 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_open fs/open.c:1460 [inline] __se_sys_open fs/open.c:1456 [inline] __x64_sys_open+0x153/0x1e0 fs/open.c:1456 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff00778efc9 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:00007ff0086d2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ff0079e5fa0 RCX: 00007ff00778efc9 RDX: 0000000000000020 RSI: 000000000014927e RDI: 00002000000001c0 RBP: 00007ff007811f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff0079e6038 R14: 00007ff0079e5fa0 R15: 00007ffd5e8624a8 hfsplus: unable to mark blocks free: error -4 hfsplus: can't free extent: start 134, count 1