============================================ WARNING: possible recursive locking detected syzkaller #0 Tainted: G L -------------------------------------------- syz-executor/19176 is trying to acquire lock: ffff88801dbfed08 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x398/0x1600 fs/hfsplus/extents.c:260 but task is already holding lock: ffff88807e415f88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x2a0/0xc10 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 6 locks held by syz-executor/19176: #0: ffff888054e04420 (sb_writers#25){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499 #1: ffff88801dbfd3f8 (&type->i_mutex_dir_key#18/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1072 [inline] #1: ffff88801dbfd3f8 (&type->i_mutex_dir_key#18/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2864 [inline] #1: ffff88801dbfd3f8 (&type->i_mutex_dir_key#18/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2875 [inline] #1: ffff88801dbfd3f8 (&type->i_mutex_dir_key#18/1){+.+.}-{4:4}, at: do_unlinkat+0x1b2/0x560 fs/namei.c:5420 #2: ffff88807e416178 (&sb->s_type->i_mutex_key#39){++++}-{4:4}, at: inode_lock include/linux/fs.h:1027 [inline] #2: ffff88807e416178 (&sb->s_type->i_mutex_key#39){++++}-{4:4}, at: vfs_unlink+0xef/0x640 fs/namei.c:5355 #3: ffff88807abb1198 (&sbi->vh_mutex){+.+.}-{4:4}, at: hfsplus_unlink+0x160/0x730 fs/hfsplus/dir.c:370 #4: ffff88807e415f88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x2a0/0xc10 fs/hfsplus/extents.c:573 #5: ffff88807abb10f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_free+0xc7/0x630 fs/hfsplus/bitmap.c:182 stack backtrace: CPU: 0 UID: 0 PID: 19176 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_deadlock_bug+0x279/0x290 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain kernel/locking/lockdep.c:3895 [inline] __lock_acquire+0x2540/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x117/0x340 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:614 [inline] __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:776 hfsplus_get_block+0x398/0x1600 fs/hfsplus/extents.c:260 block_read_full_folio+0x29f/0x830 fs/buffer.c:2420 filemap_read_folio+0x117/0x380 mm/filemap.c:2496 do_read_cache_folio+0x358/0x590 mm/filemap.c:4096 do_read_cache_page mm/filemap.c:4162 [inline] read_cache_page+0x5d/0x170 mm/filemap.c:4171 read_mapping_page include/linux/pagemap.h:1011 [inline] hfsplus_block_free+0x134/0x630 fs/hfsplus/bitmap.c:185 hfsplus_free_extents+0x121/0xa50 fs/hfsplus/extents.c:360 hfsplus_file_truncate+0x751/0xc10 fs/hfsplus/extents.c:588 hfsplus_delete_inode+0x180/0x230 fs/hfsplus/inode.c:-1 hfsplus_unlink+0x4e3/0x730 fs/hfsplus/dir.c:405 vfs_unlink+0x380/0x640 fs/namei.c:5369 do_unlinkat+0x2cf/0x560 fs/namei.c:5439 __do_sys_unlink fs/namei.c:5474 [inline] __se_sys_unlink fs/namei.c:5472 [inline] __x64_sys_unlink+0x47/0x50 fs/namei.c:5472 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fea23b8ecf7 Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 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:00007ffd1814a2d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fea23b8ecf7 RDX: 00007ffd1814a300 RSI: 00007ffd1814a390 RDI: 00007ffd1814a390 RBP: 00007ffd1814a390 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffd1814b480 R13: 00007fea23c13d7d R14: 0000000000132f41 R15: 00007ffd1814c550 hfsplus: unable to mark blocks free: error -5 hfsplus: can't free extent: start 144, count 1 hfsplus: unable to mark blocks free: error -5 hfsplus: can't free extent: start 131, count 2 hfsplus: unable to mark blocks free: error -5 hfsplus: can't free extent: start 133, count 1 hfsplus: invalid extended attribute record hfsplus: unable to mark blocks free: error -5 hfsplus: can't free extent: start 134, count 1 hfsplus: unable to mark blocks free: error -5 hfsplus: can't free extent: start 135, count 9