block2mtd: erasesize must be a divisor of device size
------------[ cut here ]------------
WARNING: CPU: 1 PID: 17932 at block/bdev.c:643 blkdev_flush_mapping+0xac/0x290 block/bdev.c:643
Modules linked in:
CPU: 1 PID: 17932 Comm: syz.4.3565 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:blkdev_flush_mapping+0xac/0x290 block/bdev.c:643
Code: 42 80 3c 28 00 74 08 4c 89 f7 e8 7f 92 cb fd 49 8b 3e 48 ba ff ff ff ff ff ff ff 7f 31 f6 e8 eb 14 a1 fd eb 11 e8 34 b1 72 fd <0f> 0b 48 85 db 75 9f e8 28 b1 72 fd 48 89 1c 24 4c 8d b3 80 00 00
RSP: 0018:ffffc9000338f970 EFLAGS: 00010287
RAX: ffffffff8414df7c RBX: ffff888020c9de00 RCX: 0000000000080000
RDX: ffffc90018439000 RSI: 00000000000110e7 RDI: 00000000000110e8
RBP: 0000000000000002 R08: ffff888020c9de3b R09: 1ffff11004193bc7
R10: dffffc0000000000 R11: ffffed1004193bc8 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff888020c9df34 R15: ffff888020c9de38
FS:  00007f139e1f66c0(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c32fc23 CR3: 00000000245b8000 CR4: 00000000003506e0
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: 0033:0x7f139ff9e1d9
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:00007f139e1f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f13a0225fa0 RCX: 00007f139ff9e1d9
RDX: 00000000000000b3 RSI: 0000200000000340 RDI: 0000000000000003
RBP: 00007f13a0035888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f13a0226038 R14: 00007f13a0225fa0 R15: 00007ffd1b38e7f8
 </TASK>