[Bug 226174] umass access results in kernel panic

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226174

--- Comment #2 from Rupert Stitzinger <stitzinger_rupert at web.de> ---
1. Installed the patch for scsi_da from below link (D14456)
--> Same behaviour

2. messages when crashing (hope no typo):
-----------------------
#
// plug in usb stick
umass1 on uhub0
.
umass1: SCSI over bulk-only; quirks=0x4000
umass1:2:1: Attached to scbus2
da1 at umass-sim1 bus 1 scbus 2 target 0 lun 0
da1: <  1100> Removable Direct Access SPC-2 SCSI device
.
da1: 40.000MB/s transfers
.
da1: quirks=0x2<NO_6_BYTE>
#
# mount_msdosfs /dev/da1 /mnt/dos       
panic: bq_remove: Remove buffer 0xfffffe0000e3ec40 from wrong queue
cpuid=1
time=1520878478
KBD: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00004a07a0
vpanic() at vpanic+0x18d/frame 0xfffffe00004a0800
vpanic() at vpanic/frame 0xfffffe00004a0800
bq_remove() at bq_remove+0x151/frame 0xfffffe00004a08a0
buf_recycle() at buf_recycle+0x1a6/frame 0xfffffe00004a0910
bufspace_demon() at bufspace_demon+0x9a/frame 0xfffffe00004a0970
fork_exit() at fork_exit+0x84/frame 0xfffffe00004a09b0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00004a09b0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KBD: enter: panic
[thread pid 22 tid 1000072 ]
Stopped at    kbd_enter+0x3b: movq   $0,kdb_why
db>
------------------------------

// Added some debug printfs at various functions at head and at end for
entering and leaving (only at the end of function) some functions
// Before panic: ENTER dastart, LEAVE dastart, ENTER dadone, ENTER dastart,
LEAVE dastart panic:
-----------------------------

Might be of interest: Machine has microcode patches (for Meltdown / Spectre) in
BIOS.

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