Date: Fri, 9 Apr 2004 21:12:33 -0400 From: David Magda <dmagda@ee.ryerson.ca> To: freebsd-stable@freebsd.org Subject: panic on 4.x using star to /dev/nsa0 Message-ID: <25650060-8A8C-11D8-9C7E-000A95B96FF8@ee.ryerson.ca>
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Hello, I've experienced a panic when I was trying to backup /home using star (archivers/star) to sa0: sa0 at ahc0 bus 0 target 6 lun 0 sa0: <HP C1557A U812> Removable Sequential Access SCSI-2 device sa0: 10.000MB/s transfers (10.000MHz, offset 15) ahc0 is the following: ahc0: <Adaptec 2940 SCSI adapter> port 0xd400-0xd4ff mem 0xef800000-0xef800fff irq 9 at device 10.0 on pci2 /home is on a Seagate SCSI disk (da1) sitting on a Tekram controller (sym0). The system is a 4.9-STABLE box: FreeBSD number6.magda.ca 4.9-STABLE FreeBSD 4.9-STABLE #2: Tue Mar 2 15:58:20 EST 2004 dave<at>number6.magda.ca:/usr/obj/usr/src/sys/MYKERNELE i386 I've setup the system to dump core in these situations so running gdb(1) gives the following results: (no debugging symbols found)... IdlePTD at physical address 0x005af000 initial pcb at physical address 0x0030a0e0 panicstr: Waiting List traversal panic messages: --- panic: Waiting List traversal [...] 7 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 <<<<<<<<<<<<< Dump Card State Ends >>>>>>>>>>>>>>>>>> ahc0: ahc_intr - referenced scb not valid during SELTO scb(0, 0) >>>>>>>>>>>>>>>>>> Dump Card State Begins <<<<<<<<<<<<<<<<< ahc0: Dumping Card State while idle, at SEQADDR 0x18 Card was paused ACCUM = 0x8, SINDEX = 0x20, DINDEX = 0xc0, ARG_2 = 0x2 HCNT = 0x0 SCBPTR = 0x0 SCSISIGI[0x0] ERROR[0x0] SCSIBUSL[0x0] LASTPHASE[0x1] SCSISEQ[0x0] SBLKCTL[0x0] SCSIRATE[0x0] SEQCTL[0x10] SEQ_FLAGS[0xc0] SSTAT0[0x5] SSTAT1[0x2] SSTAT2[0x0] SSTAT3[0x0] SIMODE0[0x0] SIMODE1[0xa4] SXFRCTL0[0x80] DFCNTRL[0x0] DFSTATUS[0x8] STACK: 0x0 0x160 0x190 0x17 SCB count = 10 Kernel NEXTQSCB = 7 Card NEXTQSCB = 31 QINFIFO entries: Waiting Queue entries: 0:0 Disconnected Queue entries: QOUTFIFO entries: Sequencer Free SCB List: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Sequencer SCB Info: 0 SCB_CONTROL[0x0] SCB_SCSIID[0x10] SCB_LUN[0x0] SCB_TAG[0x0] 1 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff] 2 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff] 3 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff] 4 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff] 5 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff] 6 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff] 7 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff] 8 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff] 9 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff] 10 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff] 11 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff] 12 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff] 13 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff] 14 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff] 15 SCB_CONTROL[0x0] SCB_SCSIID[0xff] SCB_LUN[0xff] SCB_TAG[0xff] Pending list: 8 SCB_CONTROL[0x40] SCB_SCSIID[0x67] SCB_LUN[0x0] Kernel Free SCB list: 9 6 5 4 3 2 1 0 Untagged Q(6): 8 <<<<<<<<<<<<<<<<< Dump Card State Ends >>>>>>>>>>>>>>>>>> ahc0: ahc_intr - referenced scb not valid during SELTO scb(0, 0) >>>>>>>>>>>>>>>>>> Dump Card State Begins <<<<<<<<<<<<<<<<< ahc0: Dumping Card State while idle, at SEQADDR 0x18 Card was paused ACCUM = 0x8, SINDEX = 0x20, DINDEX = 0xc0, ARG_2 = 0x2 HCNT = 0x0 SCBPTR = 0x0 [...] The above is repeated over and over again. A 'bt' command in the debugger gives the following: (kgdb) bt #0 0xc01822ce in dumpsys () #1 0xc0182098 in boot () #2 0xc01824e5 in panic () #3 0xc0152c8f in ahc_search_qinfifo () #4 0xc0155690 in ahc_recover_commands () #5 0xc01573cf in ahc_recovery_thread () This has only happened once so far so I haven't filed a PR in case it's not reproducible. Since I have the kernel dump I can give more information if needed if someone would be willing to tell me what to type into the debugger's CLI. Don't have much experience in this since I haven't had many panics under FreeBSD. :> (Is there a document describing this? A kind of "what happens if the system panics" FAQ/HOWTO.) I'll try reproducing it tomorrow (Saturday). P.S. Please CC me as I'm not currently subscribed to freebsd-stable@.
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