syz.0.0: attempt to access beyond end of device loop0: rw=0, sector=411, nr_sectors = 1 limit=64 Buffer I/O error on dev loop0, logical block 411, async page read syz.0.0: attempt to access beyond end of device loop0: rw=0, sector=412, nr_sectors = 1 limit=64 Buffer I/O error on dev loop0, logical block 412, async page read syz.0.0: attempt to access beyond end of device loop0: rw=0, sector=413, nr_sectors = 1 limit=64 Buffer I/O error on dev loop0, logical block 413, async page read syz.0.0: attempt to access beyond end of device loop0: rw=0, sector=414, nr_sectors = 1 limit=64 Buffer I/O error on dev loop0, logical block 414, async page read syz.0.0: attempt to access beyond end of device loop0: rw=0, sector=411, nr_sectors = 1 limit=64 Buffer I/O error on dev loop0, logical block 411, async page read syz.0.0: attempt to access beyond end of device loop0: rw=0, sector=412, nr_sectors = 1 limit=64 Buffer I/O error on dev loop0, logical block 412, async page read syz.0.0: attempt to access beyond end of device loop0: rw=0, sector=413, nr_sectors = 1 limit=64 Buffer I/O error on dev loop0, logical block 413, async page read syz.0.0: attempt to access beyond end of device loop0: rw=0, sector=414, nr_sectors = 1 limit=64 Buffer I/O error on dev loop0, logical block 414, async page read ============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- syz.0.0/5333 is trying to acquire lock: ffff888042990730 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xf2/0x15e0 fs/hfs/extent.c:397 but task is already holding lock: ffff8880429900f0 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xf2/0x15e0 fs/hfs/extent.c:397 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&HFS_I(tree->inode)->extents_lock); lock(&HFS_I(tree->inode)->extents_lock); *** DEADLOCK *** May be due to missing lock nesting notation 5 locks held by syz.0.0/5333: #0: ffff888041984410 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493 #1: ffff88803949fad0 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1074 [inline] #1: ffff88803949fad0 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2914 [inline] #1: ffff88803949fad0 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2938 [inline] #1: ffff88803949fad0 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: filename_create+0x200/0x370 fs/namei.c:4950 #2: ffff888039b860a8 (&tree->tree_lock){+.+.}-{4:4}, at: hfs_find_init+0x18e/0x300 fs/hfs/bfind.c:-1 #3: ffff8880429900f0 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xf2/0x15e0 fs/hfs/extent.c:397 #4: ffff8880368340a8 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfs_find_init+0x18e/0x300 fs/hfs/bfind.c:-1 stack backtrace: CPU: 0 UID: 0 PID: 5333 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:646 [inline] __mutex_lock+0x1a3/0x1550 kernel/locking/mutex.c:820 hfs_extend_file+0xf2/0x15e0 fs/hfs/extent.c:397 hfs_bmap_reserve+0x107/0x430 fs/hfs/btree.c:269 __hfs_ext_write_extent+0x1fa/0x470 fs/hfs/extent.c:121 __hfs_ext_cache_extent+0x6b/0x9b0 fs/hfs/extent.c:174 hfs_ext_read_extent fs/hfs/extent.c:202 [inline] hfs_extend_file+0x39b/0x15e0 fs/hfs/extent.c:401 hfs_bmap_reserve+0x107/0x430 fs/hfs/btree.c:269 hfs_cat_create+0x20f/0x800 fs/hfs/catalog.c:104 hfs_mkdir+0x79/0xe0 fs/hfs/dir.c:232 vfs_mkdir+0x413/0x630 fs/namei.c:5261 filename_mkdirat+0x285/0x510 fs/namei.c:5294 __do_sys_mkdirat fs/namei.c:5315 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5312 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: 0033:0x7f4661d9cdd9 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:00007f465e1d3fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f4662016180 RCX: 00007f4661d9cdd9 RDX: 0000000000000000 RSI: 0000200000000100 RDI: ffffffffffffff9c RBP: 00007f4661e32d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4662016218 R14: 00007f4662016180 R15: 00007ffd2730fa58 syz.0.0: attempt to access beyond end of device loop0: rw=0, sector=411, nr_sectors = 1 limit=64 Buffer I/O error on dev loop0, logical block 411, async page read syz.0.0: attempt to access beyond end of device loop0: rw=0, sector=412, nr_sectors = 1 limit=64 Buffer I/O error on dev loop0, logical block 412, async page read