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Date:      Fri, 10 Jan 2025 10:07:32 -0500
From:      Alexander Motin <mav@FreeBSD.org>
To:        Maurizio Vairani <maurizio1018@gmail.com>, freebsd-current <freebsd-current@freebsd.org>
Subject:   Re: Panic testing ZFS raidz expansion feature.
Message-ID:  <79d3921a-a8cf-4daf-936e-6fc6f9634118@FreeBSD.org>
In-Reply-To: <CAN0zgYUWBBO-nZ9hMSziU5pUQgBiVEBGhC=sZXoAFmPhFBA1fg@mail.gmail.com>
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Hi Maurizio,

I was able to reproduce it on a real hardware.  The critical points are 
that vdev should have ashift > 9 and it should be a debug build.  This 
patch fixes it for me: https://github.com/openzfs/zfs/pull/16942 .

On 10.01.2025 03:33, Maurizio Vairani wrote:
> I'm using vm-bhyve-1.5.0_1. The vm-byve package is configured correctly.
> 
> # vm iso 
> https://download.freebsd.org/snapshots/amd64/amd64/ISO-IMAGES/15.0/FreeBSD-15.0-CURRENT-amd64-20250109-4c89d59e0cda-274641-bootonly.iso <https://download.freebsd.org/snapshots/amd64/amd64/ISO-IMAGES/15.0/FreeBSD-15.0-CURRENT-amd64-20250109-4c89d59e0cda-274641-bootonly.iso>;
> # vm create fbsd15-13
> # cd /mnt/pool2tb/vm/fbsd15-13
> In fbsd15-13.conf:
> memory=2G
> # vm install fbsd15-13 
> FreeBSD-15.0-CURRENT-amd64-20250109-4c89d59e0cda-274641-bootonly.iso
> # vm console fbsd15-13
> Install the OS and switch off the VM.
> # truncate -s 10G disk1.img
> # truncate -s 10G disk2.img
> # truncate -s 10G disk3.img
> # truncate -s 10G disk4.img
> lines added in fbsd15-13.conf:
> disk1_type="virtio-blk"
> disk1_name="disk1.img"
> disk2_type="virtio-blk"
> disk2_name="disk2.img"
> disk3_type="virtio-blk"
> disk3_name="disk3.img"
> disk4_type="virtio-blk"
> disk4_name="disk4.img"
> # vm start fbsd15-13
> # vm console fbsd15-13
> In the VM:
> # zpool create tank raidz1 vtbd1 vtbd2 vtbd3
> # zpool attach tank raidz1-0 vtbd4
> panic: VERIFY(vd == vd->vdev_top) failed
> 
> cpuid = 0
> time = 1736497428
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 
> 0xfffffe005469f820
> vpanic() at vpanic+0x136/frame 0xfffffe005469f950
> spl_panic() at spl_panic+0x3a/frame 0xfffffe005469f9b0
> zio_vdev_io_start() at zio_vdev_io_start+0x63a/frame 0xfffffe005469fa00
> zio_nowait() at zio_nowait+0x10c/frame 0xfffffe005469fa40
> vdev_check_boot_reserve() at vdev_check_boot_reserve+0x7a/frame 
> 0xfffffe005469fa70
> spa_vdev_attach() at spa_vdev_attach+0x712/frame 0xfffffe005469faf0
> zfs_ioc_vdev_attach() at zfs_ioc_vdev_attach+0x75/frame 0xfffffe005469fb30
> zfsdev_ioctl_common() at zfsdev_ioctl_common+0x49a/frame 0xfffffe005469fbd0
> zfsdev_ioctl() at zfsdev_ioctl+0xfb/frame 0xfffffe005469fc00
> devfs_ioctl() at devfs_ioctl+0xd1/frame 0xfffffe005469fc50
> vn_ioctl() at vn_ioctl+0xb6/frame 0xfffffe005469fcc0
> devfs_ioctl_f() at devfs_ioctl_f+0x1e/frame 0xfffffe005469fce0
> kern_ioctl() at kern_ioctl+0x286/frame 0xfffffe005469fd40
> sys_ioctl() at sys_ioctl+0x12f/frame 0xfffffe005469fe00
> amd64_syscall() at amd64_syscall+0x158/frame 0xfffffe005469ff30
> fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe005469ff30
> --- syscall (54, FreeBSD ELF64, ioctl), rip = 0x2f2054f58cca, rsp = 
> 0x2f2048e41cf8, rbp = 0x2f2048e41d60 ---
> KDB: enter: panic
> [ thread pid 999 tid 100184 ]
> Stopped at      kdb_enter+0x33: movq    $0,0x10538d2(%rip)
> db>

-- 
Alexander Motin
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