loop0: detected capacity change from 0 to 1024 ====================================================== WARNING: possible circular locking dependency detected 6.10.0-rc5-syzkaller-00018-g55027e689933 #0 Not tainted ------------------------------------------------------ syz-executor.0/9552 is trying to acquire lock: ffff888026c71548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1c1/0xfe0 fs/hfsplus/extents.c:457 but task is already holding lock: ffff88802b3f40b0 (&tree->tree_lock#2){+.+.}-{3:3}, at: hfsplus_find_init+0x1a7/0x200 fs/hfsplus/bfind.c:30 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&tree->tree_lock#2){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752 hfsplus_file_truncate+0x886/0x9e0 fs/hfsplus/extents.c:595 hfsplus_write_failed fs/hfsplus/inode.c:37 [inline] hfsplus_write_begin+0x117/0x150 fs/hfsplus/inode.c:51 generic_perform_write+0x272/0x620 mm/filemap.c:4015 __generic_file_write_iter+0x1fd/0x240 mm/filemap.c:4110 generic_file_write_iter+0xe7/0x350 mm/filemap.c:4136 new_sync_write fs/read_write.c:497 [inline] vfs_write+0x6b6/0x1140 fs/read_write.c:590 ksys_write+0x12f/0x260 fs/read_write.c:643 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e -> #0 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752 hfsplus_file_extend+0x1c1/0xfe0 fs/hfsplus/extents.c:457 hfsplus_bmap_reserve+0x31c/0x410 fs/hfsplus/btree.c:358 hfsplus_create_cat+0x213/0x10e0 fs/hfsplus/catalog.c:272 hfsplus_fill_super+0x16ce/0x1bc0 fs/hfsplus/super.c:566 mount_bdev+0x1e3/0x2d0 fs/super.c:1659 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1780 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x6e1/0x1f10 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&tree->tree_lock#2); lock(&HFSPLUS_I(inode)->extents_lock); lock(&tree->tree_lock#2); lock(&HFSPLUS_I(inode)->extents_lock); *** DEADLOCK *** 3 locks held by syz-executor.0/9552: #0: ffff88802b3f00e0 (&type->s_umount_key#77/1){+.+.}-{3:3}, at: alloc_super+0x23d/0xbd0 fs/super.c:344 #1: ffff88802be8a998 (&sbi->vh_mutex){+.+.}-{3:3}, at: hfsplus_fill_super+0x1657/0x1bc0 fs/hfsplus/super.c:559 #2: ffff88802b3f40b0 (&tree->tree_lock#2){+.+.}-{3:3}, at: hfsplus_find_init+0x1a7/0x200 fs/hfsplus/bfind.c:30 stack backtrace: CPU: 0 PID: 9552 Comm: syz-executor.0 Not tainted 6.10.0-rc5-syzkaller-00018-g55027e689933 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752 hfsplus_file_extend+0x1c1/0xfe0 fs/hfsplus/extents.c:457 hfsplus_bmap_reserve+0x31c/0x410 fs/hfsplus/btree.c:358 hfsplus_create_cat+0x213/0x10e0 fs/hfsplus/catalog.c:272 hfsplus_fill_super+0x16ce/0x1bc0 fs/hfsplus/super.c:566 mount_bdev+0x1e3/0x2d0 fs/super.c:1659 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1780 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x6e1/0x1f10 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7304579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f5ef6400 EFLAGS: 00000292 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00000000f5ef6460 RCX: 0000000020002380 RDX: 0000000020000000 RSI: 0000000000004040 RDI: 00000000f5ef64a0 RBP: 00000000f5ef6460 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 nbd: must specify at least one socket fuse: Bad value for 'fd' ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi