block2mtd: erasesize must be a divisor of device size
------------[ cut here ]------------
WARNING: CPU: 0 PID: 10710 at block/bdev.c:643 blkdev_flush_mapping+0xac/0x290 block/bdev.c:643
Modules linked in:
CPU: 0 PID: 10710 Comm: syz.3.1056 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:blkdev_flush_mapping+0xac/0x290 block/bdev.c:643
Code: 42 80 3c 28 00 74 08 4c 89 f7 e8 4f d2 cb fd 49 8b 3e 48 ba ff ff ff ff ff ff ff 7f 31 f6 e8 4b 57 a1 fd eb 11 e8 14 46 73 fd <0f> 0b 48 85 db 75 9f e8 08 46 73 fd 48 89 1c 24 4c 8d b3 80 00 00
RSP: 0018:ffffc9000522f970 EFLAGS: 00010283
RAX: ffffffff8414453c RBX: ffff888148b18bc0 RCX: 0000000000080000
RDX: ffffc900116f6000 RSI: 000000000000c772 RDI: 000000000000c773
RBP: 0000000000000002 R08: ffff888148b18bfb R09: 1ffff1102916317f
R10: dffffc0000000000 R11: ffffed1029163180 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff888148b18cf4 R15: ffff888148b18bf8
FS:  00007fe09a7236c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f79a49556c8 CR3: 0000000073bed000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 blkdev_put_whole block/bdev.c:676 [inline]
 blkdev_put+0x49a/0x7a0 block/bdev.c:954
 block2mtd_free_device drivers/mtd/devices/block2mtd.c:212 [inline]
 add_device drivers/mtd/devices/block2mtd.c:337 [inline]
 block2mtd_setup2+0x98f/0xe30 drivers/mtd/devices/block2mtd.c:454
 block2mtd_setup+0x27/0xd0 drivers/mtd/devices/block2mtd.c:471
 param_attr_store+0x20e/0x300 kernel/params.c:586
 module_attr_store+0x5f/0x80 kernel/params.c:906
 kernfs_fop_write_iter+0x3a4/0x520 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2018 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x474/0x9a0 fs/read_write.c:584
 ksys_write+0x151/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe09979e159
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:00007fe09a723028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe099a25fa0 RCX: 00007fe09979e159
RDX: 00000000000000b3 RSI: 0000200000000250 RDI: 0000000000000003
RBP: 00007fe09983506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe099a26038 R14: 00007fe099a25fa0 R15: 00007fff474cf658
 </TASK>