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Subjectlinux-next boot error: kernel panic: VFS: Unable to mount root fs on unknown-block(0,0)

syzbot found the following issue on:

HEAD commit: 8d374d0d Add linux-next specific files for 20210208
git tree: linux-next
console output:
kernel config:
dashboard link:

IMPORTANT: if you fix the issue, please add the following tag to the commit:

netconsole: network logging started
gtp: GTP module loaded (pdp ctx size 104 bytes)
rdma_rxe: loaded
cfg80211: Loading compiled-in X.509 certificates for regulatory database
cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
ALSA device list:
#0: Dummy 1
#1: Loopback 1
#2: Virtual MIDI Card 1
md: Waiting for all devices to be available before autodetect
md: If you don't use raid, use raid=noautodetect
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
VFS: Cannot open root device "sda1" or unknown-block(0,0): error -6
Please append a correct "root=" boot option; here are the available partitions:
0100 4096 ram0
0101 4096 ram1
0102 4096 ram2
0103 4096 ram3
0104 4096 ram4
0105 4096 ram5
0106 4096 ram6
0107 4096 ram7
0108 4096 ram8
0109 4096 ram9
010a 4096 ram10
010b 4096 ram11
010c 4096 ram12
010d 4096 ram13
010e 4096 ram14
010f 4096 ram15
1f00 128 mtdblock0
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.11.0-rc6-next-20210208-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:120
panic+0x306/0x73d kernel/panic.c:231
mount_block_root+0x3f8/0x4dd init/do_mounts.c:445
mount_root+0x1af/0x1f5 init/do_mounts.c:561
prepare_namespace+0x1ff/0x234 init/do_mounts.c:613
kernel_init_freeable+0x671/0x689 init/main.c:1550
kernel_init+0xd/0x1b8 init/main.c:1426
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Kernel Offset: disabled
Rebooting in 86400 seconds..

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