linux-kernel - regression on aarch64? panic on boot

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Date:   Mon, 16 Jan 2023 22:57:11 +0100
From:   Klaus Jensen <its@...elevant.dk>
To:     Christoph Hellwig <hch@....de>
Cc:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Sagi Grimberg <sagi@...mberg.me>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: regression on aarch64? panic on boot

Hi,

I'm getting panics when booting from a QEMU hw/nvme device on an aarch64
guest in roughly 20% of boots on v6.2-rc4. Example panic below.

I've bisected it to commit eac3ef262941 ("nvme-pci: split the initial
probe from the rest path").

I'm not seeing this on any other emulated platforms that I'm currently
testing (x86_64, riscv32/64, mips32/64 and sparc64).


nvme nvme0: 1/0/0 default/read/poll queues
NET: Registered PF_VSOCK protocol family
registered taskstats version 1
nvme nvme0: Ignoring bogus Namespace Identifiers
/dev/root: Can't open blockdev
VFS: Cannot open root device "nvme0n1" or unknown-block(0,0): error -6
Please append a correct "root=" boot option; here are the available partitions:
103:00000      61440 nvme0n1
 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.2.0-rc4 #22
Hardware name: linux,dummy-virt (DT)
Call trace:
 dump_backtrace.part.0+0xdc/0xf0
 show_stack+0x18/0x30
 dump_stack_lvl+0x7c/0xa0
 dump_stack+0x18/0x34
 panic+0x17c/0x328
 mount_block_root+0x184/0x234
 mount_root+0x178/0x198
 prepare_namespace+0x124/0x164
 kernel_init_freeable+0x2a0/0x2c8
 kernel_init+0x2c/0x130
 ret_from_fork+0x10/0x20
Kernel Offset: disabled
CPU features: 0x00000,01800100,0000420b
Memory Limit: none
---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]---

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