qnx6: unable to read the first superblock
------------[ cut here ]------------
!IS_ALIGNED(size, bdev_logical_block_size(bdev))
WARNING: fs/buffer.c:1029 at __getblk_slow fs/buffer.c:1029 [inline], CPU#0: syz.5.137/6524
WARNING: fs/buffer.c:1029 at bdev_getblk.cold+0x6/0x45 fs/buffer.c:1358, CPU#0: syz.5.137/6524
Modules linked in:
CPU: 0 UID: 0 PID: 6524 Comm: syz.5.137 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__getblk_slow fs/buffer.c:1029 [inline]
RIP: 0010:bdev_getblk.cold+0x6/0x45 fs/buffer.c:1358
Code: 8b e8 ab 30 fd ff 58 e9 83 4a 7a 01 e8 a0 47 51 01 eb 96 48 89 4c 24 08 e8 94 47 51 01 48 8b 4c 24 08 eb c5 e8 e8 88 e3 00 90 <0f> 0b 90 8b 74 24 04 89 da 48 c7 c7 c0 7e c6 8b e8 72 30 fd ff e9
RSP: 0018:ffffc9000370fa88 EFLAGS: 00010287
RAX: 0000000000005a17 RBX: 0000000000000400 RCX: ffffc9001c4e4000
RDX: 0000000000080000 RSI: ffffffff81251df8 RDI: ffff88803399ca00
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000200
R13: 0000000000000008 R14: 0000000000000400 R15: ffff8880240ae780
FS:  00007f2275df66c0(0000) GS:ffff888124372000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2275df5ff8 CR3: 0000000069011000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __bread_gfp+0x86/0x3c0 fs/buffer.c:1412
 sb_bread include/linux/buffer_head.h:346 [inline]
 qnx6_check_first_superblock+0xa6/0x270 fs/qnx6/inode.c:260
 qnx6_fill_super+0x103e/0x13f0 fs/qnx6/inode.c:332
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1694
 vfs_get_tree+0x92/0x320 fs/super.c:1754
 fc_mount fs/namespace.c:1193 [inline]
 do_new_mount_fc fs/namespace.c:3758 [inline]
 do_new_mount fs/namespace.c:3834 [inline]
 path_mount+0x7d0/0x23d0 fs/namespace.c:4154
 do_mount fs/namespace.c:4167 [inline]
 __do_sys_mount fs/namespace.c:4383 [inline]
 __se_sys_mount fs/namespace.c:4360 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4360
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2277b9cdd9
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:00007f2275df6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f2277e16090 RCX: 00007f2277b9cdd9
RDX: 0000200000004200 RSI: 0000200000000040 RDI: 0000200000000000
RBP: 00007f2277c32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000a18410 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2277e16128 R14: 00007f2277e16090 R15: 00007ffd4ca2fd18
 </TASK>