[Bug 213155] possible kernel regression when running 11.x-RELEASE on KVM on AMD Opterons

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213155

--- Comment #27 from mainl...@apeiron.net ---
FreeBSD 11.1 also boots fine with this patch.

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Problem reports for freebsd-bugs@FreeBSD.org that need special attention

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To view an individual PR, use:
  https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=(Bug Id).

The following is a listing of current problems submitted by FreeBSD users,
which need special attention. These represent problem reports covering
all versions including experimental development code and obsolete releases.

Status  |Bug Id | Description
+---+---
In Progress |183618 | [panic] Dell PowerEdge R620 -- PERC H710 Mini (mf 
In Progress |196973 | sh(1) broken UTF-8 input  
In Progress |207109 | makefs includes a timestamp that prevents reprodu 
In Progress |212562 | stucking kyua test (/usr/tests/lib/libutil) on 10 
In Progress |218593 | [patch] binmiscctl should use modfind instead of  
In Progress |221854 | makefs: Reject UFS labels that are too long to fi 
New |197876 | [devfs] an error in devfs leads to data loss and  
New |198797 | [PATCH] Added an option to install BSDstats to bs 
New |202290 | /usr/bin/vi conversion error on valid character   
New |202362 | ntp: restore refclocks selection (10.2-RELEASE re 
New |202740 | vi/ex string substitution problem when there is m 
New |204097 | witness_initialize() does not perform bound check 
New |204115 | freebsd-update: Add support for better user messa 
New |204545 | Adding quirk entry for some (Acer C720P Chromeboo 
New |205598 | [patch] sbin/md5.c param -c, convert to lowercase 
New |207940 | [patch] sys/boot/efi/boot1 select boot partition  
New |209213 | UEFI Loader shows only black screen with Nvidia G 
New |210245 | [PATCH] Update etc/ntp.conf to eliminate failure  
New |210804 | installerconfig - using ZFS create in custom scri 
New |212561 | stucking kyua test (/usr/tests/sys/acl/01) with e 
New |214705 | Kernel panic trying to playback encrypted DVD, "F 
New |221906 | sys/cddl: Allow to modify the ZFS deadman sysctls 
New |221973 | cam iosched: BIO_ZONE commands probably shouldn't 
New |221974 | cam iosched: The iops limiter should enforce limi 
New |224436 | vt: CONS_CLRHIST (vidcontrol -C) not implemented  
Open| 71667 | [patch] cleanup of the usr.sbin/bootparamd code   
Open|155873 | calendar(1) recurring date not working
Open|157718 | input data trigers a core dump from calendar(1) [ 
Open|194925 | [pf] [ifconfig] interface group keywords do not w 
Open|204121 | numa(4) is broken: "vm_page_alloc: missing page"  
Open|206528 | Emulex LPe 16002 FC HBA Not Recognized by oce(4)  
Open|206585 | hpt_set_info possible buffer overflow 
Open|206754 | Out of bounds negative array index in iicrdwr 
Open|207248 | [patch] daemon(8): Add option to redirect stdout  
Open|212418 | kernel panic in _taskqgroup_adjust - uninitialize 
Open|217505 | [asmc] [patch] Add Support for Macbook Pro 8,1
Open|220246 | syslogd does not send RFC3164-conformant messages 
Open|221305 | Mouse cursor loss when moving cursor while loadin 
Open|221350 | Unable to boot/install on HPE Proliant MicroServe 
Open|222632 | connect(2) not available in capability mode   
In Progress |191348 | [mps] LSI2308 with WD3000FYYZ drives disappears a 
Open|206754 | Out of bounds negative array index in iicrdwr 

42 problems total for which you should take action.
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[Bug 226510] panic: Re-refing for reason 5, cnt = 1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226510

Andriy Gapon  changed:

   What|Removed |Added

 CC||i...@freebsd.org

--- Comment #3 from Andriy Gapon  ---
I don't know the design behind da_periph_acquire, but I suspect that there
could be a collision between the periodic damediapoll() call and, say,
AC_SCSI_AEN notification coming from the device.

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[Bug 226510] panic: Re-refing for reason 5, cnt = 1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226510

--- Comment #2 from Roman Bogorodskiy  ---
(In reply to Andriy Gapon from comment #1)

I've updated the title.

Unread portion of the kernel message buffer:
panic: Re-refing for reason 5, cnt = 1
cpuid = 0
time = 1520754073
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfe005b975820
vpanic() at vpanic+0x18d/frame 0xfe005b975880
panic() at panic+0x43/frame 0xfe005b9758e0
damediapoll() at damediapoll+0xa7/frame 0xfe005b975900
softclock_call_cc() at softclock_call_cc+0x150/frame 0xfe005b9759b0
softclock() at softclock+0x7c/frame 0xfe005b9759e0
intr_event_execute_handlers() at intr_event_execute_handlers+0x99/frame
0xfe005b975a20
ithread_loop() at ithread_loop+0xb7/frame 0xfe005b975a70
fork_exit() at fork_exit+0x84/frame 0xfe005b975ab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfe005b975ab0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic

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[Bug 226510] panic: Re-refing for reason 5, cnt = 1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226510

Roman Bogorodskiy  changed:

   What|Removed |Added

Summary|Panic in|panic: Re-refing for reason
   |da_periph_acquire() |5, cnt = 1

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[Bug 226510] Panic in da_periph_acquire()

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226510

--- Comment #1 from Andriy Gapon  ---
What's the panic message?
Would make sense to put it into the bug title.

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[Bug 226510] Panic in da_periph_acquire()

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226510

Bug ID: 226510
   Summary: Panic in da_periph_acquire()
   Product: Base System
   Version: CURRENT
  Hardware: amd64
OS: Any
Status: New
  Severity: Affects Only Me
  Priority: ---
 Component: kern
  Assignee: freebsd-bugs@FreeBSD.org
  Reporter: no...@freebsd.org

>From time to time on my desktop system running fairly fresh current I get a
panic with the following trace:

(kgdb) bt
#0  __curthread () at ./machine/pcpu.h:230
#1  doadump (textdump=0) at /usr/src/sys/kern/kern_shutdown.c:347
#2  0x8040a96b in db_dump (dummy=, dummy2=,
dummy3=, dummy4=) at
/usr/src/sys/ddb/db_command.c:574
#3  0x8040a739 in db_command (last_cmdp=,
cmd_table=, dopager=) at
/usr/src/sys/ddb/db_command.c:481
#4  0x8040a4b4 in db_command_loop () at
/usr/src/sys/ddb/db_command.c:534
#5  0x8040d6df in db_trap (type=, code=)
at /usr/src/sys/ddb/db_main.c:250
#6  0x80b18ff3 in kdb_trap (type=3, code=-61456, tf=) at
/usr/src/sys/kern/subr_kdb.c:697
#7  0x80f8b868 in trap (frame=0xfe005b975750) at
/usr/src/sys/amd64/amd64/trap.c:547
#8  
#9  kdb_enter (why=0x811f9f80 "panic", msg=) at
/usr/src/sys/kern/subr_kdb.c:479
#10 0x80ad3dca in vpanic (fmt=, ap=0xfe005b9758c0)
at /usr/src/sys/kern/kern_shutdown.c:801
#11 0x80ad3e53 in panic (fmt=0x81be33f8 
"\266;\034\201\377\377\377\377") at /usr/src/sys/kern/kern_shutdown.c:739
#12 0x80369c57 in da_periph_acquire (periph=,
token=DA_REF_TUR) at /usr/src/sys/cam/scsi/scsi_da.c:1574
#13 damediapoll (arg=0xf80004bf2300) at
/usr/src/sys/cam/scsi/scsi_da.c:5668
#14 0x80aebd00 in softclock_call_cc (c=0xfe0069c15a68,
cc=0x81df2ac0 , direct=) at
/usr/src/sys/kern/kern_timeout.c:731
#15 0x80aec0cc in softclock (arg=0x81df2ac0 ) at
/usr/src/sys/kern/kern_timeout.c:869
#16 0x80a96cc9 in intr_event_execute_handlers (p=,
ie=0xf80003826200) at /usr/src/sys/kern/kern_intr.c:1338
#17 0x80a973b7 in ithread_execute_handlers (ie=,
p=) at /usr/src/sys/kern/kern_intr.c:1351
#18 ithread_loop (arg=0xf8000382f120) at /usr/src/sys/kern/kern_intr.c:1432
#19 0x80a94104 in fork_exit (callout=0x80a97300 ,
arg=0xf8000382f120, frame=0xfe005b975ac0) at
/usr/src/sys/kern/kern_fork.c:1039
#20 
(kgdb)


Sources version:

Last Changed Rev: 330676
Last Changed Date: 2018-03-09 04:50:40 +0400 (Fri, 09 Mar 2018)

The only da(4) device I had when it paniced was:
da0 at umass-sim0 bus 0 scbus4 target 0 lun 0   
da0:  Removable Direct Access SCSI device  
da0: Serial Number 058F0OB1 
da0: 40.000MB/s transfers   
da0: Attempt to query device size failed: NOT READY, Medium not present 
da0: quirks=0x2  

This is a flash card reader, and usually it stays connected, but without flash
cards attached to it. In other words, I didn't do anything with it to trigger a
panic.

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