Date: Mon, 2 Jun 1997 19:34:45 +0300 (EEST) From: Petri Helenius <pete@sms.fi> To: Bob Dunaway <bob@rdsw.com> Cc: scsi@FreeBSD.ORG Subject: SCSI crashes with ahc on 2.2-STABLE Message-ID: <199706021634.TAA02668@silver.sms.fi> In-Reply-To: <199706021536.KAA28015@rdsw.com> References: <199706021536.KAA28015@rdsw.com>
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I've been complaining about the recovery code hanging my system when a single TIMEOUT happens for a month or two now. There has been definite improvements since it does not panic any longer but I'm not sure whether it should hang after recovery process. The messages I get are somewhat similar: May 20 11:26:29 silver /kernel: cd0(ahc0:6:0): SCB 0x5 - timed out while idle, L ASTPHASE == 0x1, SCSISIGI == 0x0 May 20 11:26:29 silver /kernel: SEQADDR = 0x6 SCSISEQ = 0x12 SSTAT0 = 0x5 SSTAT1 = 0xa May 20 11:26:29 silver /kernel: cd0(ahc0:6:0): Queueing an Abort SCB May 20 11:26:29 silver /kernel: cd0(ahc0:6:0): Abort Message Sent May 20 11:26:29 silver /kernel: cd0(ahc0:6:0): SCB 5 - Abort Completed. May 20 11:26:29 silver /kernel: cd0(ahc0:6:0): no longer in timeout May 20 11:26:30 silver /kernel: ahc0:A:6: no active SCB for reconnecting target - issuing BUS DEVICE RESET May 20 11:26:30 silver /kernel: SAVED_TCL == 0x60 ARG_1 == 0x5 SEQADDR == 0x114 May 20 11:26:30 silver /kernel: ahc0: Bus Device Reset delivered. 1 SCBs aborted May 20 11:26:30 silver /kernel: ahc0: Bus Device Reset delivered. 0 SCBs aborted ********HANG******** May 20 22:04:55 silver /kernel: cd0(ahc0:6:0): SCB 0x3 - timed out while idle, L ASTPHASE == 0x1, SCSISIGI == 0x0 May 20 22:04:55 silver /kernel: SEQADDR = 0x9 SCSISEQ = 0x12 SSTAT0 = 0x5 SSTAT1 = 0xa May 20 22:04:55 silver /kernel: cd0(ahc0:6:0): Queueing an Abort SCB May 20 22:04:55 silver /kernel: cd0(ahc0:6:0): Abort Message Sent May 20 22:04:55 silver /kernel: cd0(ahc0:6:0): SCB 3 - Abort Completed. May 20 22:04:56 silver /kernel: cd0(ahc0:6:0): no longer in timeout ********HANG******** May 21 08:54:10 silver /kernel: cd0(ahc0:6:0): SCB 0x4 - timed out while idle, L ASTPHASE == 0x1, SCSISIGI == 0x0 May 21 08:54:10 silver /kernel: SEQADDR = 0x6 SCSISEQ = 0x12 SSTAT0 = 0x5 SSTAT1 = 0xa May 21 08:54:10 silver /kernel: cd0(ahc0:6:0): Queueing an Abort SCB May 21 08:54:10 silver /kernel: cd0(ahc0:6:0): Abort Message Sent May 21 08:54:10 silver /kernel: cd0(ahc0:6:0): SCB 4 - Abort Completed. May 21 08:54:10 silver /kernel: cd0(ahc0:6:0): no longer in timeout ********HANG******** May 22 09:18:33 silver /kernel: cd0(ahc0:6:0): SCB 0x5 - timed out while idle, L ASTPHASE == 0x1, SCSISIGI == 0x0 May 22 09:18:33 silver /kernel: SEQADDR = 0x6 SCSISEQ = 0x12 SSTAT0 = 0x5 SSTAT1 = 0xa May 22 09:18:33 silver /kernel: cd0(ahc0:6:0): Queueing an Abort SCB May 22 09:18:33 silver /kernel: cd0(ahc0:6:0): Abort Message Sent May 22 09:18:33 silver /kernel: cd0(ahc0:6:0): SCB 5 - Abort Completed. May 22 09:18:33 silver /kernel: cd0(ahc0:6:0): no longer in timeout ********HANG******** May 16 20:13:10 silver /kernel: cd0(ahc0:6:0): SCB 0x0 - timed out while idle, L ASTPHASE == 0x1, SCSISIGI == 0x0 May 16 20:13:10 silver /kernel: SEQADDR = 0x5 SCSISEQ = 0x12 SSTAT0 = 0x5 SSTAT1 = 0xa May 16 20:13:10 silver /kernel: cd0(ahc0:6:0): Queueing an Abort SCB May 16 20:13:10 silver /kernel: cd0(ahc0:6:0): Abort Message Sent May 16 20:13:10 silver /kernel: cd0(ahc0:6:0): SCB 0 - Abort Completed. May 16 20:13:10 silver /kernel: cd0(ahc0:6:0): no longer in timeout ********HANG******** Bob Dunaway writes: > Here is an example of SCSI AHC 2842 system crash after disk errors. > I am running 2.2-STABLE as of 04:00 CST May 5. I added a Quantum 2gb > Capello disk drive as target 2 several days ago. After putting about > 400 meg of data on the drive, I ran a dump to a DAT tape. I got > 11 read errors and then the system crashed. Both AWRE and ARRE are > enabled on the drive. I then tried a tar to /dev/null to determine > the files with errors. I had several system crashes after read errors. > Shown below, is the error log from 1 test run. There were 2 bad files. > The first showed unrecovered errors and the second only showed the abort > messages. After I removed all of the files with bad sectors, I reran > the dump to tape and had no problems. Following the error messages > are the verbose boot messages and then the kernel configuration file. > > Thanks, > Bob Dunaway > bob@rdsw.com > > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * > > May 29 13:28:25 rds1 /kernel: sd2(ahc0:2:0): MEDIUM ERROR info:2c297d asc:11,0 Unrecovered read error > May 29 13:28:26 rds1 /kernel: , retries:4 > May 29 13:28:28 rds1 /kernel: sd2(ahc0:2:0): MEDIUM ERROR info:2c297d asc:11,0 Unrecovered read error > May 29 13:28:28 rds1 /kernel: , retries:3 > May 29 13:28:31 rds1 /kernel: sd2(ahc0:2:0): MEDIUM ERROR info:2c297d asc:11,0 Unrecovered read error > May 29 13:28:31 rds1 /kernel: , retries:2 > May 29 13:28:33 rds1 /kernel: sd2(ahc0:2:0): MEDIUM ERROR info:2c297d asc:11,0 Unrecovered read error > May 29 13:28:33 rds1 /kernel: , retries:1 > May 29 13:28:36 rds1 /kernel: sd2(ahc0:2:0): MEDIUM ERROR info:2c297d asc:11,0 Unrecovered read error > May 29 13:28:36 rds1 /kernel: , FAILURE > May 29 13:36:31 rds1 /kernel: sd2(ahc0:2:0): SCB 0x0 - timed out while idle, LASTPHASE == 0x1, SCSISIGI == 0x0 > May 29 13:36:31 rds1 /kernel: SEQADDR = 0x4 SCSISEQ = 0x12 SSTAT0 = 0x0 SSTAT1 = 0xa > May 29 13:36:31 rds1 /kernel: sd2(ahc0:2:0): Queueing an Abort SCB > May 29 13:36:31 rds1 /kernel: sd2(ahc0:2:0): Abort Message Sent > May 29 13:36:31 rds1 /kernel: sd2(ahc0:2:0): SCB 0 - Abort Completed. > May 29 13:36:31 rds1 /kernel: sd2(ahc0:2:0): no longer in timeout > > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * > > May 29 11:46:28 rds1 /kernel: Copyright (c) 1992-1997 FreeBSD Inc. > May 29 11:46:28 rds1 /kernel: Copyright (c) 1982, 1986, 1989, 1991, 1993 > May 29 11:46:28 rds1 /kernel: The Regents of the University of California. All rights reserved. > May 29 11:46:28 rds1 /kernel: > May 29 11:46:28 rds1 /kernel: FreeBSD 2.2-STABLE #0: Thu May 22 14:37:21 CDT 1997 > May 29 11:46:28 rds1 /kernel: root@rds1.rdsw.com:/usr/src-r2_2.2/sys/compile/HTI > May 29 11:46:28 rds1 /kernel: Calibrating clock(s) ... i8254 clock: 1193461 Hz > May 29 11:46:28 rds1 /kernel: CLK_USE_I8254_CALIBRATION not specified - using default frequency > May 29 11:46:28 rds1 /kernel: CPU: i486 DX2 (486-class CPU) > May 29 11:46:28 rds1 /kernel: Origin = "GenuineIntel" Id = 0x435 Stepping=5 > May 29 11:46:28 rds1 /kernel: Features=0x3<FPU,VME> > May 29 11:46:28 rds1 /kernel: real memory = 16777216 (16384K bytes) > May 29 11:46:29 rds1 /kernel: avail memory = 14671872 (14328K bytes) > May 29 11:46:29 rds1 /kernel: ahc0: <Adaptec 284X SCSI host adapter> at 0x1c00-0x1cff irq 11 on eisa0 slot 1 > May 29 11:46:29 rds1 /kernel: ahc0: Using Edge Triggered Interrupts > May 29 11:46:29 rds1 /kernel: ahc0: aic7770 >= Rev E, Single Channel, SCSI Id=7, 4 SCBs > May 29 11:46:29 rds1 /kernel: ahc0: Resetting Channel A > May 29 11:46:29 rds1 /kernel: ahc0: Downloading Sequencer Program...ahc0: 369 instructions downloaded > May 29 11:46:29 rds1 /kernel: Done > May 29 11:46:29 rds1 /kernel: ahc0: Probing channel A > May 29 11:46:29 rds1 /kernel: Choosing drivers for scbus configured at 0 > May 29 11:46:29 rds1 /kernel: ahc0 waiting for scsi devices to settle > May 29 11:46:29 rds1 /kernel: ahc0: target 0 synchronous at 10.0MHz, offset = 0xf > May 29 11:46:29 rds1 /kernel: (ahc0:0:0): "MICROP 2217-15MZ1001905 HQ30" type 0 fixed SCSI 2 > May 29 11:46:29 rds1 /kernel: sd0(ahc0:0:0): Direct-Access 1685MB (3450902 512 byte sectors) > May 29 11:46:29 rds1 /kernel: sd0(ahc0:0:0): with 2372 cyls, 15 heads, and an average 96 sectors/track > May 29 11:46:29 rds1 /kernel: ahc0: target 1 synchronous at 10.0MHz, offset = 0xf > May 29 11:46:29 rds1 /kernel: (ahc0:1:0): "QUANTUM EMPIRE_1080S 1220" type 0 fixed SCSI 2 > May 29 11:46:29 rds1 /kernel: sd1(ahc0:1:0): Direct-Access 1029MB (2109376 512 byte sectors) > May 29 11:46:29 rds1 /kernel: sd1(ahc0:1:0): with 2874 cyls, 8 heads, and an average 91 sectors/track > May 29 11:46:30 rds1 /kernel: ahc0: target 2 synchronous at 10.0MHz, offset = 0xf > May 29 11:46:30 rds1 /kernel: (ahc0:2:0): "QUANTUM VP32210 81H8" type 0 fixed SCSI 2 > May 29 11:46:30 rds1 /kernel: sd2(ahc0:2:0): Direct-Access 2103MB (4308352 512 byte sectors) > May 29 11:46:30 rds1 /kernel: sd2(ahc0:2:0): with 4243 cyls, 8 heads, and an average 126 sectors/track > May 29 11:46:30 rds1 /kernel: ahc0: target 5 synchronous at 5.0MHz, offset = 0xf > May 29 11:46:30 rds1 /kernel: (ahc0:5:0): "ARCHIVE Python 00367-XXX 5.23" type 1 removable SCSI 2 > May 29 11:46:30 rds1 /kernel: st is configured at 0 > May 29 11:46:30 rds1 /kernel: st0(ahc0:5:0): Sequential-Access density code 0x13, drive empty > May 29 11:46:30 rds1 /kernel: ahc0: target 6 synchronous at 4.0MHz, offset = 0xf > May 29 11:46:30 rds1 /kernel: (ahc0:6:0): "TOSHIBA CD-ROM XM-3401TA 1094" type 5 removable SCSI 2 > May 29 11:46:30 rds1 /kernel: cd0(ahc0:6:0): CD-ROM can't get the size > May 29 11:46:30 rds1 /kernel: pcibus_setup(1): mode 1 addr port (0x0cf8) is 0xffffffff > May 29 11:46:30 rds1 /kernel: pcibus_setup(2): mode 2 enable port (0x0cf8) is 0xff > May 29 11:46:30 rds1 /kernel: Probing for devices on the ISA bus: > May 29 11:46:30 rds1 /kernel: sc0: the current keyboard controller command byte 0045 > May 29 11:46:30 rds1 /kernel: kbdio: RESET_KBD return code:00fa > May 29 11:46:30 rds1 /kernel: kbdio: RESET_KBD status:00aa > May 29 11:46:30 rds1 /kernel: sc0 at 0x60-0x6f irq 1 on motherboard > May 29 11:46:30 rds1 /kernel: sc0: BIOS video mode:3 > May 29 11:46:31 rds1 /kernel: sc0: VGA registers upon power-up > May 29 11:46:31 rds1 /kernel: 50 18 10 00 10 00 03 00 02 67 5f 4f 50 82 55 81 > May 29 11:46:31 rds1 /kernel: bf 1f 00 4f 0e 0f 00 00 ff ff 9c 8e 8f 28 1f 96 > May 29 11:46:31 rds1 /kernel: b9 a3 ff 00 01 02 03 04 05 14 07 38 39 3a 3b 3c > May 29 11:46:31 rds1 /kernel: 3d 3e 3f 0c 00 0f 08 00 00 00 00 00 10 0e 00 ff > May 29 11:46:31 rds1 /kernel: sc0: video mode:24 > May 29 11:46:31 rds1 /kernel: sc0: VGA color <16 virtual consoles, flags=0x0> > May 29 11:46:31 rds1 /kernel: sio0 at 0x3f8-0x3ff irq 4 on isa > May 29 11:46:31 rds1 /kernel: sio0: type 16450 > May 29 11:46:31 rds1 /kernel: sio1 not found at 0x2f8 > May 29 11:46:31 rds1 /kernel: sio2: disabled, not probed. > May 29 11:46:31 rds1 /kernel: sio3: disabled, not probed. > May 29 11:46:31 rds1 /kernel: lpt0 at 0x378-0x37f irq 7 on isa > May 29 11:46:31 rds1 /kernel: lpt0: Interrupt-driven port > May 29 11:46:31 rds1 /kernel: lp0: TCP/IP capable interface > May 29 11:46:31 rds1 /kernel: lpt1 not found at 0xffffffff > May 29 11:46:31 rds1 /kernel: mse0: wrong signature ff > May 29 11:46:31 rds1 /kernel: mse0 not found at 0x23c > May 29 11:46:32 rds1 /kernel: psm0: disabled, not probed. > May 29 11:46:32 rds1 /kernel: fdc0 at 0x3f0-0x3f7 irq 6 drq 2 on isa > May 29 11:46:32 rds1 /kernel: fdc0: NEC 72065B > May 29 11:46:32 rds1 /kernel: fd0: 1.44MB 3.5in > May 29 11:46:32 rds1 /kernel: wdc0 not found at 0x1f0 > May 29 11:46:32 rds1 /kernel: wdc1 not found at 0x170 > May 29 11:46:32 rds1 /kernel: 1 3C5x9 board(s) on ISA found at 0x300 > May 29 11:46:32 rds1 /kernel: ep0 at 0x300-0x30f irq 10 on isa > May 29 11:46:32 rds1 /kernel: ep0: aui/utp/bnc[*UTP*] address 00:20:af:52:37:4c > May 29 11:46:32 rds1 /kernel: npx0 on motherboard > May 29 11:46:32 rds1 /kernel: npx0: INT 16 interface > May 29 11:46:32 rds1 /kernel: apm0: disabled, not probed. > May 29 11:46:32 rds1 /kernel: imasks: bio c0000840, tty c0030492, net c0030492 > May 29 11:46:32 rds1 /kernel: BIOS Geometries: > May 29 11:46:32 rds1 /kernel: 0:03fe3f20 0..1022=1023 cylinders, 0..63=64 heads, 1..32=32 sectors > May 29 11:46:32 rds1 /kernel: 1:03fe3f20 0..1022=1023 cylinders, 0..63=64 heads, 1..32=32 sectors > May 29 11:46:32 rds1 /kernel: 0 accounted for > May 29 11:46:32 rds1 /kernel: Device configuration finished. > May 29 11:46:33 rds1 /kernel: Considering FFS root f/s. > May 29 11:46:33 rds1 /kernel: changing root device to sd0a > May 29 11:46:33 rds1 /kernel: configure() finished. > May 29 11:46:33 rds1 /kernel: sd0s1: type 0x6, start 32, end = 204799, size 204768 : OK > May 29 11:46:33 rds1 /kernel: sd0s2: type 0xa5, start 204800, end = 3450879, size 3246080 : OK > May 29 11:46:33 rds1 /kernel: WARNING: / was not properly dismounted. > May 29 11:46:33 rds1 /kernel: sd1s1: type 0xa5, start 0, end = 2109375, size 2109376 : OK > May 29 11:46:33 rds1 /kernel: sd2s1: type 0xa5, start 63, end = 4305419, size 4305357 : OK > May 29 11:46:33 rds1 /kernel: sd1s1: type 0xa5, start 0, end = 2109375, size 2109376 : OK > May 29 11:46:33 rds1 /kernel: sd2s1: type 0xa5, start 63, end = 4305419, size 4305357 : OK > May 29 11:46:36 rds1 lpd[106]: restarted > > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * > > # > # GENERIC -- Generic machine with WD/AHx/NCR/BTx family disks > # > # For more information read the handbook part System Administration -> > # Configuring the FreeBSD Kernel -> The Configuration File. > # The handbook is available in /usr/share/doc/handbook or online as > # latest version from the FreeBSD World Wide Web server > # <URL:http://www.FreeBSD.ORG/>; > # > # An exhaustive list of options and more detailed explanations of the > # device lines is present in the ./LINT configuration file. If you are > # in doubt as to the purpose or necessity of a line, check first in LINT. > # > # $Id: GENERIC,v 1.77.2.2 1997/02/03 22:53:24 gibbs Exp $ > > machine "i386" > #cpu "I386_CPU" > cpu "I486_CPU" > cpu "I586_CPU" > cpu "I686_CPU" > ident RDS > maxusers 30 > > options MATH_EMULATE #Support for x87 emulation > options INET #InterNETworking > options FFS #Berkeley Fast Filesystem > options NFS #Network Filesystem > options MSDOSFS #MSDOS Filesystem > options "CD9660" #ISO 9660 Filesystem > options PROCFS #Process filesystem > options "COMPAT_43" #Compatible with BSD 4.3 [KEEP THIS!] > options SCSI_DELAY=15 #Be pessimistic about Joe SCSI device > options BOUNCE_BUFFERS #include support for DMA bounce buffers > options UCONSOLE #Allow users to grab the console > options FAILSAFE #Be conservative > options USERCONFIG #boot -c editor > options VISUAL_USERCONFIG #visual boot -c editor > options CHILD_MAX=512 > options OPEN_MAN=512 > > options SYSVSHM > options SYSVSEM > options SYSVMSG > > config kernel root on wd0 > > controller isa0 > controller eisa0 > controller pci0 > > controller fdc0 at isa? port "IO_FD1" bio irq 6 drq 2 vector fdintr > disk fd0 at fdc0 drive 0 > disk fd1 at fdc0 drive 1 > tape ft0 at fdc0 drive 2 > > controller wdc0 at isa? port "IO_WD1" bio irq 14 vector wdintr > disk wd0 at wdc0 drive 0 > disk wd1 at wdc0 drive 1 > > controller wdc1 at isa? port "IO_WD2" bio irq 15 vector wdintr > disk wd2 at wdc1 drive 0 > disk wd3 at wdc1 drive 1 > > #options ATAPI #Enable ATAPI support for IDE bus > #options ATAPI_STATIC #Don't do it as an LKM > #device wcd0 #IDE CD-ROM > > # A single entry for any of these controllers (ncr, ahb, ahc, amd) is > # sufficient for any number of installed devices. > #controller ncr0 > #controller amd0 > #controller ahb0 > controller ahc0 > #controller bt0 at isa? port "IO_BT0" bio irq ? vector bt_isa_intr > #controller uha0 at isa? port "IO_UHA0" bio irq ? drq 5 vector uhaintr > #controller aha0 at isa? port "IO_AHA0" bio irq ? drq 5 vector ahaintr > #controller aic0 at isa? port 0x340 bio irq 11 vector aicintr > #controller nca0 at isa? port 0x1f88 bio irq 10 vector ncaintr > #controller nca1 at isa? port 0x350 bio irq 5 vector ncaintr > #controller sea0 at isa? bio irq 5 iomem 0xc8000 iosiz 0x2000 vector seaintr > > controller scbus0 at ahc0 > tape st0 at scbus0 target 5 > tape st1 at scbus0 target 4 > > controller scbus0 > > device sd0 > > device od0 #See LINT for possible `od' options. > > device st0 > > device cd0 #Only need one of these, the code dynamically grows > > #device wt0 at isa? port 0x300 bio irq 5 drq 1 vector wtintr > #device mcd0 at isa? port 0x300 bio irq 10 vector mcdintr > > #controller matcd0 at isa? port 0x230 bio > > #device scd0 at isa? port 0x230 bio > > # syscons is the default console driver, resembling an SCO console > device sc0 at isa? port "IO_KBD" tty irq 1 vector scintr > # Enable this and PCVT_FREEBSD for pcvt vt220 compatible console driver > #device vt0 at isa? port "IO_KBD" tty irq 1 vector pcrint > #options PCVT_FREEBSD=210 # pcvt running on FreeBSD >= 2.0.5 > #options XSERVER # include code for XFree86 > #options FAT_CURSOR # start with block cursor > # If you have a ThinkPAD, uncomment this along with the rest of the PCVT lines > #options PCVT_SCANSET=2 # IBM keyboards are non-std > > # Mandatory, don't remove > device npx0 at isa? port "IO_NPX" irq 13 vector npxintr > > # > # Laptop support (see LINT for more options) > # > device apm0 at isa? disable # Advanced Power Management > options APM_BROKEN_STATCLOCK # Workaround some buggy APM BIOS > # PCCARD (PCMCIA) support > #controller crd0 > #device pcic0 at crd? > #device pcic1 at crd? > > device sio0 at isa? port "IO_COM1" tty irq 4 vector siointr > device sio1 at isa? port "IO_COM2" tty irq 3 vector siointr > device sio2 at isa? disable port "IO_COM3" tty irq 5 vector siointr > device sio3 at isa? disable port "IO_COM4" tty irq 9 vector siointr > > device lpt0 at isa? port? tty irq 7 vector lptintr > device lpt1 at isa? port? tty > device mse0 at isa? port 0x23c tty irq 5 vector mseintr > > device psm0 at isa? disable port "IO_KBD" conflicts tty irq 12 vector psmintr > > # Order is important here due to intrusive probes, do *not* alphabetize > # this list of network interfaces until the probes have been fixed. > # Right now it appears that the ie0 must be probed before ep0. See > # revision 1.20 of this file. > #device de0 > #device fxp0 > #device vx0 > > #device ed0 at isa? port 0x280 net irq 5 iomem 0xd8000 vector edintr > #device ed1 at isa? port 0x300 net irq 5 iomem 0xd8000 vector edintr > #device ie0 at isa? port 0x360 net irq 7 iomem 0xd0000 vector ieintr > device ep0 at isa? port 0x300 net irq 10 vector epintr > #device fe0 at isa? port 0x300 net irq ? vector feintr > #device ix0 at isa? port 0x300 net irq 10 iomem 0xd0000 iosiz 32768 vector ixintr > #device le0 at isa? port 0x300 net irq 5 iomem 0xd0000 vector le_intr > #device lnc0 at isa? port 0x280 net irq 10 drq 0 vector lncintr > #device ze0 at isa? port 0x300 net irq 5 iomem 0xd8000 vector zeintr > #device zp0 at isa? port 0x300 net irq 10 iomem 0xd8000 vector zpintr > > pseudo-device loop > pseudo-device ether > pseudo-device log > pseudo-device sl 1 > # ijppp uses tun instead of ppp device > #pseudo-device ppp 1 > pseudo-device tun 1 > pseudo-device pty 64 > pseudo-device gzip # Exec gzipped a.out's > > # KTRACE enables the system-call tracing facility ktrace(2). > # This adds 4 KB bloat to your kernel, and slightly increases > # the costs of each syscall. > options KTRACE #kernel tracing >
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