Re: "panic: vrele: negative ref cnt" on RELENG_5

From: Tai-hwa Liang (avatar_at_mmlab.cse.yzu.edu.tw)
Date: 09/30/04

  • Next message: Vlad: "Re: panic: sorele" 
    Date: Thu, 30 Sep 2004 09:56:20 +0800 (CST)
To: Kris Kennaway <kris@obsecurity.org>

    Hi,

      I ran into this panic on a Pentium 4 box two hours ago; however, there's
    no backtrace available since the box was booted with 5.3-BETA6-i386-disc2:

            panic: vrele: negative ref cnt
            boot() called on cpu#1
            Uptime: 8h54m1s

      The operations performed before the panic took place were:

            mount /dev/ad4s3f /mnt # an UFS1 FreeBSD slice
            mkdir /mnt3
            mount_msdosfs /dev/ad5s3 /mnt3 # a FAT32 partition
            bsdtar -cpvf /mnt3/backup.tar /mnt
            ^D # leave the FIXIT shell, BOOM!

      Not sure this is relevant, but there're a couple of "ad4: FAILURE ...
    UNCORRETABLE.. LBA=xxx..." errors while bsdtar was running.

    On Wed, 29 Sep 2004, Kris Kennaway wrote:
    > An amd64 machine I updated 5 days ago panicked with this at reboot
    > time:
    >
    > Waiting (max 60 seconds) for system process `vnlru' to stop...done
    > Waiting (max 60 seconds) for system process `bufdaemon' to stop...done
    > Waiting (max 60 seconds) for system process `syncer' to stop...
    > Syncing disks, vnodes remaining...1 1 1 0 0 done
    > No buffers busy after final sync
    > panic: vrele: negative ref cnt
    > kdb_enter() at kdb_enter+0x2f
    > panic() at panic+0x1d2
    > vrele() at vrele+0x1ec
    > ffs_unmount() at ffs_unmount+0x182
    > dounmount() at dounmount+0x171
    > vfs_unmountall() at vfs_unmountall+0x50
    > boot() at boot+0x809
    > reboot() at reboot+0x3d
    > syscall() at syscall+0x4ab
    > Xfast_syscall() at Xfast_syscall+0xa8
    > --- syscall (55, FreeBSD ELF64, reboot), rip = 0x20076d76c, rsp = 0x7fffffffebb8, rbp = 0x1b0ab ---
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