qnx6: unable to read the first superblock
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8321 at fs/buffer.c:1125 __getblk_slow+0x4cc/0x560 fs/buffer.c:1125
Modules linked in:
CPU: 0 UID: 0 PID: 8321 Comm: syz.3.9610 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__getblk_slow+0x4cc/0x560 fs/buffer.c:1125
Code: 80 8b 48 89 df e8 64 94 bb ff 90 0f 0b e8 bc d6 71 ff 48 c7 c6 60 86 80 8b 48 89 df e8 4d 94 bb ff 90 0f 0b e8 a5 d6 71 ff 90 <0f> 0b 90 8b 74 24 0c 89 ea 48 c7 c7 c0 87 80 8b 31 db e8 3d 77 50
RSP: 0018:ffffc9000412fa88 EFLAGS: 00010287
RAX: 0000000000004dd2 RBX: 0000000000000200 RCX: ffffc9000cad9000
RDX: 0000000000080000 RSI: ffffffff8249426b RDI: 0000000000000005
RBP: 0000000000000400 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000200 R11: 0000000000000000 R12: ffff888148c18b80
R13: 0000000000000000 R14: 0000000000000200 R15: ffff888148c18b80
FS:  00007f9f310586c0(0000) GS:ffff888124e71000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000004a00 CR3: 00000000669bf000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 bdev_getblk+0xd4/0xe0 fs/buffer.c:1461
 __bread_gfp+0x86/0x3c0 fs/buffer.c:1515
 sb_bread include/linux/buffer_head.h:346 [inline]
 qnx6_check_first_superblock+0xab/0x2d0 fs/qnx6/inode.c:260
 qnx6_fill_super+0xd8d/0x1520 fs/qnx6/inode.c:332
 get_tree_bdev_flags+0x389/0x620 fs/super.c:1692
 vfs_get_tree+0x8b/0x340 fs/super.c:1752
 do_new_mount fs/namespace.c:3750 [inline]
 path_mount+0x1516/0x2060 fs/namespace.c:4065
 do_mount fs/namespace.c:4078 [inline]
 __do_sys_mount fs/namespace.c:4278 [inline]
 __se_sys_mount fs/namespace.c:4255 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4255
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9f3018eec9
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:00007f9f31058038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f9f303e5fa0 RCX: 00007f9f3018eec9
RDX: 0000200000000100 RSI: 0000200000004a00 RDI: 00002000000000c0
RBP: 00007f9f30211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000008007 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9f303e6038 R14: 00007f9f303e5fa0 R15: 00007ffec18b58e8
 </TASK>