kernel BUG in drivers/scsi/53c700.c:1129

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Hi James,

I just tried Debian kernel 4.6.1-1 on my historic 715/64 machine, and it
ran into this  BUG() in the LASI scsi driver:

 scsi 0:0:6:0: no saved request for untagged cmd

Any idea?

Helge
 
[    0.000000] Linux version 4.6.0-1-parisc (debian-kernel@xxxxxxxxxxxxxxxx) (gcc version 5.4.0 20160603 (Debian 5.4.0-3) ) #1 Debian 4.6.1-1 (2016-06-06)
...
[    0.000000] Determining PDC firmware type: Snake.
[    0.000000] model 000060a0 00000481 00000000 00000000 773c7d2c 00000000 00000004 00000072 00000072
[    0.000000] vers  0000000c
[    0.000000] model 9000/715
[    0.000000] Total Memory: 160 MB
...
[   43.180000] SCSI subsystem initialized
[   45.076000] 53c700: Version 2.8 By James.Bottomley@xxxxxxxxxxxxxxxxxxxxx
[   45.156000] scsi0: 53c710 rev 2 
[   46.204000] scsi host0: LASI SCSI 53c700
[   58.268000] scsi 0:0:6:0: no saved request for untagged cmd
[   58.336000] ------------[ cut here ]------------
[   58.392000] kernel BUG at /build/linux-XAODSw/linux-4.6.1/drivers/scsi/53c700.c:1129!
[   58.484000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.6.0-1-parisc #1 Debian 4.6.1-1
[   58.580000] task: 1083cdd8 ti: 107b1000 task.ti: 107b1000
[   58.644000] 
[   58.660000]      YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
[   58.716000] PSW: 00000000000001001111111100001110 Not tainted
[   58.788000] r00-03  0004ff0e 0084e388 00a8ea8c 107ba400
[   58.848000] r04-07  00000000 00000000 15b88cc0 00000006
[   58.912000] r08-11  198ca400 000000ff 00000020 00000000
[   58.976000] r12-15  000000ff 00001003 10801020 00000001
[   59.036000] r16-19  107b1240 00000002 000000ff 00000001
[   59.100000] r20-23  00000001 0000000e 0084f388 00000000
[   59.164000] r24-27  107ba500 0083b540 1021a7a4 107b5020
[   59.224000] r28-31  00000000 00000040 107ba480 104d52bc
[   59.288000] sr00-03  00000000 00000000 00000000 0000000d
[   59.352000] sr04-07  00000000 00000000 00000000 00000000
[   59.416000] 
[   59.432000] IASQ: 00000000 00000000 IAOQ: 00a8ea8c 00a8ea90
[   59.500000]  IIR: 03ffe01f    ISR: 0000000d  IOR: 00a8ea90
[   59.564000]  CPU:        0   CR30: 107b1000 CR31: f00effff
[   59.632000]  ORIG_R28: 10855e80
[   59.668000]  IAOQ[0]: process_script_interrupt+0x13ec/0x16a4 [53c700]
[   59.748000]  IAOQ[1]: process_script_interrupt+0x13f0/0x16a4 [53c700]
[   59.824000]  RP(r2): process_script_interrupt+0x13ec/0x16a4 [53c700]
[   59.900000] Backtrace:
[   59.928000]  [<00a8ea8c>] process_script_interrupt+0x13ec/0x16a4 [53c700]
[   60.012000] 
[   60.028000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.6.0-1-parisc #1 Debian 4.6.1-1
[   60.120000] Backtrace:
[   60.148000]  [<1015bffc>] show_stack+0x3c/0x50
[   60.204000]  [<10425d40>] dump_stack+0x28/0x38
[   60.256000]  [<1015c180>] die_if_kernel+0x134/0x20c
[   60.316000]  [<1015cd34>] handle_interruption+0x804/0x828
[   60.380000] 
[   60.400000] Kernel panic - not syncing: Fatal exception in interrupt
[   60.400000] ---[ end Kernel panic - not syncing: Fatal exception in interrupt
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