hfs: continuing without an alternate MDB
hfs: unable to open extent tree
hfs: can't find a HFS filesystem on dev loop3
hfs: unable to locate alternate MDB
hfs: continuing without an alternate MDB
general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 0 PID: 3722 Comm: syz-executor5 Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:hfs_find_init+0x73/0x180 fs/hfs/bfind.c:21
Code: ea 03 80 3c 02 00 0f 85 ee 00 00 00 4d 8d 6c 24 40 48 c7 43 18 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e ac 00 00 00 41 8b 44 24 40 be
RSP: 0018:ffff8881c93e7348 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8881c93e73c8 RCX: 1ffff1103929d105
RDX: 0000000000000008 RSI: ffff8881c93e73c8 RDI: ffff8881c93e73e0
RBP: ffff8881c93e7368 R08: 0000000000000000 R09: ffff8881c93e7428
R10: 0000000000000000 R11: ffffed10391bee5a R12: 0000000000000000
R13: 0000000000000040 R14: ffff8881c8df738a R15: ffff8881c93e73c8
FS:  00007fb0796e8700(0000) GS:ffff8881db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efe2c2b49ab CR3: 00000001c91f9000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 hfs_ext_read_extent+0x17e/0xcc0 fs/hfs/extent.c:200
 hfs_get_block+0x490/0x850 fs/hfs/extent.c:366
 block_read_full_page+0x290/0x9b0 fs/buffer.c:2289
 hfs_readpage+0x13/0x20 fs/hfs/inode.c:38
 do_read_cache_page+0x65c/0x1370 mm/filemap.c:2765
 read_cache_page+0x45/0x70 mm/filemap.c:2864
 read_mapping_page include/linux/pagemap.h:437 [inline]
 hfs_btree_open+0x464/0x1070 fs/hfs/btree.c:78
 hfs_mdb_get+0x132f/0x1ec7 fs/hfs/mdb.c:199
 hfs_fill_super+0x961/0x11a0 fs/hfs/super.c:407
 mount_bdev+0x27b/0x340 fs/super.c:1417
 hfs_mount+0x10/0x20 fs/hfs/super.c:457
 legacy_get_tree+0x103/0x1f0 fs/fs_context.c:592
 vfs_get_tree+0x8b/0x2d0 fs/super.c:1547
 do_new_mount fs/namespace.c:2874 [inline]
 do_mount+0x1293/0x1c40 fs/namespace.c:3199
 __do_sys_mount fs/namespace.c:3409 [inline]
 __se_sys_mount fs/namespace.c:3386 [inline]
 __x64_sys_mount+0x169/0x1c0 fs/namespace.c:3386
 do_syscall_64+0x6e/0xf0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4579fa
Code: Bad RIP value.
RSP: 002b:00007fb0796e7bb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 00000000004579fa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fb0796e7c00
RBP: 0000000000000003 R08: 00000000200001c0 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000666 R14: 00000000006fba30 R15: 0000000000000000
Modules linked in:
---[ end trace e55eda00780b257a ]---
RIP: 0010:hfs_find_init+0x73/0x180 fs/hfs/bfind.c:21
Code: ea 03 80 3c 02 00 0f 85 ee 00 00 00 4d 8d 6c 24 40 48 c7 43 18 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e ac 00 00 00 41 8b 44 24 40 be
hfs: unable to locate alternate MDB
RSP: 0018:ffff8881c93e7348 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8881c93e73c8 RCX: 1ffff1103929d105
RDX: 0000000000000008 RSI: ffff8881c93e73c8 RDI: ffff8881c93e73e0
RBP: ffff8881c93e7368 R08: 0000000000000000 R09: ffff8881c93e7428
R10: 0000000000000000 R11: ffffed10391bee5a R12: 0000000000000000
R13: 0000000000000040 R14: ffff8881c8df738a R15: ffff8881c93e73c8
FS:  00007fb0796e8700(0000) GS:ffff8881db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efe2c2b49ab CR3: 00000001c91f9000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400