loop0: detected capacity change from 0 to 1024 loop0: detected capacity change from 1024 to 0 Buffer I/O error on dev loop0, logical block 2, async page read Buffer I/O error on dev loop0, logical block 2, async page read netlink: 'syz.0.0': attribute type 1 has an invalid length. Buffer I/O error on dev loop0, logical block 43, async page read Buffer I/O error on dev loop0, logical block 44, async page read Buffer I/O error on dev loop0, logical block 45, async page read Buffer I/O error on dev loop0, logical block 46, async page read hfsplus: xattr search failed ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.0/5320 is trying to acquire lock: ffff8880410110f0 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0xa7/0xce0 fs/hfsplus/bitmap.c:35 but task is already holding lock: ffff88801277a800 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1db0 fs/hfsplus/extents.c:455 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a3/0x1550 kernel/locking/mutex.c:820 hfsplus_get_block+0x39e/0x1670 fs/hfsplus/extents.c:262 block_read_full_folio+0x29f/0x830 fs/buffer.c:2317 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 __block_write_begin_int+0x6c6/0x1910 fs/buffer.c:2042 block_write_begin fs/buffer.c:2153 [inline] cont_write_begin+0x737/0xae0 fs/buffer.c:2491 hfsplus_write_begin+0x66/0xb0 fs/hfsplus/inode.c:48 cont_expand_zero fs/buffer.c:2419 [inline] cont_write_begin+0x2e7/0xae0 fs/buffer.c:2481 hfsplus_write_begin+0x66/0xb0 fs/hfsplus/inode.c:48 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4325 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_pwritev fs/read_write.c:1155 [inline] __do_sys_pwritev2 fs/read_write.c:1213 [inline] __se_sys_pwritev2+0x184/0x2a0 fs/read_write.c:1204 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 -> #0 (&sbi->alloc_mutex){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a3/0x1550 kernel/locking/mutex.c:820 hfsplus_block_allocate+0xa7/0xce0 fs/hfsplus/bitmap.c:35 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 iter_file_splice_write+0x9a1/0x10f0 fs/splice.c:736 do_splice_from fs/splice.c:936 [inline] direct_splice_actor+0x101/0x160 fs/splice.c:1159 splice_direct_to_actor+0x53a/0xc70 fs/splice.c:1103 do_splice_direct_actor fs/splice.c:1202 [inline] do_splice_direct+0x195/0x290 fs/splice.c:1228 do_sendfile+0x535/0x7d0 fs/read_write.c:1372 __do_sys_sendfile64 fs/read_write.c:1433 [inline] __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1419 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 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&HFSPLUS_I(inode)->extents_lock); lock(&sbi->alloc_mutex); lock(&HFSPLUS_I(inode)->extents_lock); lock(&sbi->alloc_mutex); *** DEADLOCK *** 3 locks held by syz.0.0/5320: #0: ffff8880438dc410 (sb_writers#12){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160 fs/splice.c:1158 #1: ffff88801277a9e8 (&sb->s_type->i_mutex_key#24){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1029 [inline] #1: ffff88801277a9e8 (&sb->s_type->i_mutex_key#24){+.+.}-{4:4}, at: generic_file_write_iter+0x11e/0x680 mm/filemap.c:4465 #2: ffff88801277a800 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1db0 fs/hfsplus/extents.c:455 stack backtrace: CPU: 0 UID: 0 PID: 5320 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_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a3/0x1550 kernel/locking/mutex.c:820 hfsplus_block_allocate+0xa7/0xce0 fs/hfsplus/bitmap.c:35 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 iter_file_splice_write+0x9a1/0x10f0 fs/splice.c:736 do_splice_from fs/splice.c:936 [inline] direct_splice_actor+0x101/0x160 fs/splice.c:1159 splice_direct_to_actor+0x53a/0xc70 fs/splice.c:1103 do_splice_direct_actor fs/splice.c:1202 [inline] do_splice_direct+0x195/0x290 fs/splice.c:1228 do_sendfile+0x535/0x7d0 fs/read_write.c:1372 __do_sys_sendfile64 fs/read_write.c:1433 [inline] __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1419 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: 0033:0x7f88cad9ce59 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:00007f88cbcdbfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f88cb015fa0 RCX: 00007f88cad9ce59 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 RBP: 00007f88cae32d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020fffe89 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f88cb016038 R14: 00007f88cb015fa0 R15: 00007ffea33bf4b8 Buffer I/O error on dev loop0, logical block 2, async page read Buffer I/O error on dev loop0, logical block 2, async page read