loop0: detected capacity change from 0 to 1024 ============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- syz.0.0/5335 is trying to acquire lock: ffff88801271bb80 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x39e/0x1670 fs/hfsplus/extents.c:262 but task is already holding lock: ffff88801271ae80 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1db0 fs/hfsplus/extents.c:455 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 5 locks held by syz.0.0/5335: #0: ffff888042c5b9b0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320 fs/file.c:1261 #1: ffff8880369ce410 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2724 [inline] #1: ffff8880369ce410 (sb_writers#12){.+.+}-{0:0}, at: vfs_writev+0x2aa/0x990 fs/read_write.c:1057 #2: ffff88801271b068 (&sb->s_type->i_mutex_key#24){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1029 [inline] #2: ffff88801271b068 (&sb->s_type->i_mutex_key#24){+.+.}-{4:4}, at: generic_file_write_iter+0x11e/0x680 mm/filemap.c:4465 #3: ffff88801271ae80 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1db0 fs/hfsplus/extents.c:455 #4: ffff8880123780f0 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0xa7/0xce0 fs/hfsplus/bitmap.c:35 stack backtrace: CPU: 0 UID: 0 PID: 5335 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 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+0x253f/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:632 [inline] __mutex_lock+0x1a3/0x1550 kernel/locking/mutex.c:806 hfsplus_get_block+0x39e/0x1670 fs/hfsplus/extents.c:262 block_read_full_folio+0x29f/0x830 fs/buffer.c:2310 filemap_read_folio+0x137/0x3b0 mm/filemap.c:2502 do_read_cache_folio+0x358/0x590 mm/filemap.c:4107 do_read_cache_page mm/filemap.c:4173 [inline] read_cache_page+0x5d/0x170 mm/filemap.c:4182 read_mapping_page include/linux/pagemap.h:1011 [inline] hfsplus_block_allocate+0xf3/0xce0 fs/hfsplus/bitmap.c:37 hfsplus_file_extend+0xb21/0x1db0 fs/hfsplus/extents.c:466 hfsplus_get_block+0x42c/0x1670 fs/hfsplus/extents.c:247 get_more_blocks fs/direct-io.c:648 [inline] do_direct_IO fs/direct-io.c:936 [inline] __blockdev_direct_IO+0x161d/0x34e0 fs/direct-io.c:1243 blockdev_direct_IO include/linux/fs.h:3126 [inline] hfsplus_direct_IO+0x119/0x220 fs/hfsplus/inode.c:131 generic_file_direct_write+0x1db/0x3e0 mm/filemap.c:4259 __generic_file_write_iter+0x11d/0x230 mm/filemap.c:4428 generic_file_write_iter+0x14a/0x680 mm/filemap.c:4468 do_iter_readv_writev+0x619/0x8c0 fs/read_write.c:-1 vfs_writev+0x33c/0x990 fs/read_write.c:1059 do_writev+0x154/0x2e0 fs/read_write.c:1105 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2eb7b9c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2eb896efe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f2eb7e15fa0 RCX: 00007f2eb7b9c819 RDX: 0000000000000001 RSI: 0000200000000140 RDI: 0000000000000004 RBP: 00007f2eb7c32c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2eb7e16038 R14: 00007f2eb7e15fa0 R15: 00007ffdaa885408