[issue2092] Panic: Bad link elm 0x... next->prev != elm

["Magliano Andrea \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxx>]

Magliano Andrea <masterblaster@tiscali.it> added the comment:

Got fresh, on real hardware (and usable!) kdump:
https://84.73.12.43/crash/core18.tar.xz

Same problem, different place:

#0  _get_mycpu () at ./machine/thread.h:69
#1  md_dumpsys (di=<optimized out>)
    at /usr/src/sys/platform/pc64/x86_64/dump_machdep.c:263
#2  0xffffffff802c4b75 in dumpsys () at /usr/src/sys/kern/kern_shutdown.c:925
#3  0xffffffff802c51db in boot (howto=260)
    at /usr/src/sys/kern/kern_shutdown.c:387
#4  0xffffffff802c5484 in panic (
    fmt=0xffffffff817b03e0 "Bad tailq NEXT(%p->tqh_last) != NULL")
    at /usr/src/sys/kern/kern_shutdown.c:831
#5  0xffffffff817aa67a in ahci_put_ccb (ccb=0xffffffe01f272a80)
    at /usr/src/sys/dev/disk/ahci/ahci.c:3122
#6  0xffffffff817aa6e5 in ahci_ata_put_xfer (xa=<unavailable>)
    at /usr/src/sys/dev/disk/ahci/ahci.c:3494
#7  0xffffffff817a762f in ahci_ata_complete_disk_rw (xa=0xffffffe01f272a80)
    at /usr/src/sys/dev/disk/ahci/ahci_cam.c:1719
#8  0xffffffff817ab49f in ahci_ata_cmd_done (ccb=0xffffffe01f272a80)
    at /usr/src/sys/dev/disk/ahci/ahci.c:3564
#9  0xffffffff817ae08b in ahci_port_intr (ap=0xffffffe01f25c638,
    blockable=<optimized out>) at /usr/src/sys/dev/disk/ahci/ahci.c:3010
#10 0xffffffff817ae2a1 in ahci_intr (arg=<optimized out>)
    at /usr/src/sys/dev/disk/ahci/ahci.c:2352
#11 0xffffffff80294b24 in ithread_handler (arg=<optimized out>)

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<http://bugs.dragonflybsd.org/issue2092>
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