loop0: detected capacity change from 0 to 256 vfat: Unknown parameter 'shortnameower' loop0: detected capacity change from 0 to 1024 ====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc5-syzkaller-00013-g99fa936e8e4f #0 Not tainted ------------------------------------------------------ syz.0.0/5319 is trying to acquire lock: ffff8880535bc0b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x14a/0x1c0 fs/hfsplus/bfind.c:28 but task is already holding lock: ffff8880522c3048 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x383/0x14f0 fs/hfsplus/extents.c:260 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_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:458 hfsplus_bmap_reserve+0x105/0x4e0 fs/hfsplus/btree.c:358 __hfsplus_ext_write_extent+0x2a4/0x5c0 fs/hfsplus/extents.c:104 __hfsplus_ext_cache_extent+0x84/0xe10 fs/hfsplus/extents.c:186 hfsplus_ext_read_extent fs/hfsplus/extents.c:218 [inline] hfsplus_file_extend+0x48c/0x1b70 fs/hfsplus/extents.c:462 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 generic_perform_write+0x346/0x990 mm/filemap.c:4189 generic_file_write_iter+0x10c/0x5e0 mm/filemap.c:4316 aio_write+0x56b/0x7c0 fs/aio.c:1633 io_submit_one+0x8a7/0x18a0 fs/aio.c:2052 __do_sys_io_submit fs/aio.c:2111 [inline] __se_sys_io_submit+0x171/0x2e0 fs/aio.c:2081 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 (&tree->tree_lock/1){+.+.}-{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_find_init+0x14a/0x1c0 fs/hfsplus/bfind.c:28 hfsplus_ext_read_extent fs/hfsplus/extents.c:216 [inline] hfsplus_get_block+0x5c4/0x14f0 fs/hfsplus/extents.c:268 block_read_full_folio+0x3ee/0xae0 fs/buffer.c:2396 read_pages+0x35c/0x570 mm/readahead.c:171 page_cache_ra_unbounded+0x708/0x820 mm/readahead.c:298 do_sync_mmap_readahead+0x4a6/0x990 filemap_fault+0x89e/0x16c0 mm/filemap.c:3447 __do_fault+0x135/0x390 mm/memory.c:4988 do_read_fault mm/memory.c:5403 [inline] do_fault mm/memory.c:5537 [inline] do_pte_missing mm/memory.c:4058 [inline] handle_pte_fault mm/memory.c:5900 [inline] __handle_mm_fault+0x4c44/0x70f0 mm/memory.c:6043 handle_mm_fault+0x3e5/0x8d0 mm/memory.c:6212 do_user_addr_fault arch/x86/mm/fault.c:1388 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x2b9/0x8b0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 strncpy_from_user+0xbb/0x270 lib/strncpy_from_user.c:130 getname_flags+0xf1/0x540 fs/namei.c:150 do_sys_openat2+0xd2/0x1d0 fs/open.c:1422 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1454 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(&tree->tree_lock/1); lock(&HFSPLUS_I(inode)->extents_lock); lock(&tree->tree_lock/1); *** DEADLOCK *** 2 locks held by syz.0.0/5319: #0: ffff8880522c33d8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] #0: ffff8880522c33d8 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x156/0x820 mm/readahead.c:229 #1: ffff8880522c3048 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x383/0x14f0 fs/hfsplus/extents.c:260 stack backtrace: CPU: 0 UID: 0 PID: 5319 Comm: syz.0.0 Not tainted 6.14.0-rc5-syzkaller-00013-g99fa936e8e4f #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 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_find_init+0x14a/0x1c0 fs/hfsplus/bfind.c:28 hfsplus_ext_read_extent fs/hfsplus/extents.c:216 [inline] hfsplus_get_block+0x5c4/0x14f0 fs/hfsplus/extents.c:268 block_read_full_folio+0x3ee/0xae0 fs/buffer.c:2396 read_pages+0x35c/0x570 mm/readahead.c:171 page_cache_ra_unbounded+0x708/0x820 mm/readahead.c:298 do_sync_mmap_readahead+0x4a6/0x990 filemap_fault+0x89e/0x16c0 mm/filemap.c:3447 __do_fault+0x135/0x390 mm/memory.c:4988 do_read_fault mm/memory.c:5403 [inline] do_fault mm/memory.c:5537 [inline] do_pte_missing mm/memory.c:4058 [inline] handle_pte_fault mm/memory.c:5900 [inline] __handle_mm_fault+0x4c44/0x70f0 mm/memory.c:6043 handle_mm_fault+0x3e5/0x8d0 mm/memory.c:6212 do_user_addr_fault arch/x86/mm/fault.c:1388 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x2b9/0x8b0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] RIP: 0010:strncpy_from_user+0xbb/0x270 lib/strncpy_from_user.c:130 Code: 00 4c 89 f6 e8 e6 60 94 fc 49 83 fe 07 0f 86 90 00 00 00 4c 89 24 24 4c 89 74 24 08 49 c7 c4 f8 ff ff ff 45 31 ed 48 8b 04 24 <4e> 8b 34 28 48 b8 ff fe fe fe fe fe fe fe 49 8d 2c 06 4c 89 f3 48 RSP: 0018:ffffc9000d367cb0 EFLAGS: 00050246 RAX: 0000400000000d40 RBX: ffff888012395500 RCX: ffff888000780000 RDX: ffffc9000e7f2000 RSI: 0000000000000fe0 RDI: 0000000000000007 RBP: ffff888012395520 R08: ffffffff852d631a R09: 1ffffffff2079e2e R10: dffffc0000000000 R11: fffffbfff2079e2f R12: fffffffffffffff8 R13: 0000000000000000 R14: 0000000000000fe0 R15: ffff888012395520 getname_flags+0xf1/0x540 fs/namei.c:150 do_sys_openat2+0xd2/0x1d0 fs/open.c:1422 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1454 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: 0033:0x7fa29598d169 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:00007fa2968b3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fa295ba5fa0 RCX: 00007fa29598d169 RDX: 00000000001817c1 RSI: 0000400000000d40 RDI: ffffffffffffff9c RBP: 00007fa295a0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000000a0 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa295ba5fa0 R15: 00007fff92ec45d8 ---------------- Code disassembly (best guess): 0: 00 4c 89 f6 add %cl,-0xa(%rcx,%rcx,4) 4: e8 e6 60 94 fc call 0xfc9460ef 9: 49 83 fe 07 cmp $0x7,%r14 d: 0f 86 90 00 00 00 jbe 0xa3 13: 4c 89 24 24 mov %r12,(%rsp) 17: 4c 89 74 24 08 mov %r14,0x8(%rsp) 1c: 49 c7 c4 f8 ff ff ff mov $0xfffffffffffffff8,%r12 23: 45 31 ed xor %r13d,%r13d 26: 48 8b 04 24 mov (%rsp),%rax * 2a: 4e 8b 34 28 mov (%rax,%r13,1),%r14 <-- trapping instruction 2e: 48 b8 ff fe fe fe fe movabs $0xfefefefefefefeff,%rax 35: fe fe fe 38: 49 8d 2c 06 lea (%r14,%rax,1),%rbp 3c: 4c 89 f3 mov %r14,%rbx 3f: 48 rex.W