[syzbot] [kernel?] linux-next boot error: kernel panic: VFS: Unable to mount root fs on unknown-block(NUM,NUM) (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: ac139fc7db67 Add linux-next specific files for 20240206
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12acdbffe80000
kernel config: https://syzkaller.appspot.com/x/.config?x=2b5fe6166ab1fa63
dashboard link: https://syzkaller.appspot.com/bug?extid=fbd73dc34f8681ecb8c0
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7944e61925e3/disk-ac139fc7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e5fcc1af6c7d/vmlinux-ac139fc7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/be76eb66afdf/bzImage-ac139fc7.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fbd73d...@syzkaller.appspotmail.com

(driver?)
1f00 128 mtdblock0
(driver?)
0800 2097152 sda
driver: sd
0801 1048576 sda1 00000000-01

List of all bdev filesystems:
reiserfs
ext3
ext2
ext4
cramfs
squashfs
minix
vfat
msdos
exfat
bfs
iso9660
hfsplus
hfs
vxfs
sysv
v7
hpfs
ntfs3
ufs
efs
affs
romfs
qnx4
qnx6
adfs
fuseblk
udf
omfs
jfs
xfs
nilfs2
befs
ocfs2
gfs2
gfs2meta
f2fs
bcachefs
erofs
zonefs
btrfs

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1)
CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.8.0-rc3-next-20240206-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
panic+0x349/0x860 kernel/panic.c:348
mount_root_generic+0x3b5/0x3e0 init/do_mounts.c:234
prepare_namespace+0xc2/0x100 init/do_mounts.c:489
kernel_init_freeable+0x471/0x5d0 init/main.c:1555
kernel_init+0x1d/0x2b0 init/main.c:1432
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242
</TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.