Date: Sat, 16 Dec 2017 10:47:50 -0800 From: Mark Millard <markmi@dsl-only.net> To: FreeBSD Hackers <freebsd-hackers@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org> Subject: faq/troubleshoot.html#indefinite-wait-buffer has the direction of transfer wrong (head -r326888 /usr/src/) Message-ID: <BD1E6290-23E1-4231-8E0A-AC0FEA3F32C2@dsl-only.net>
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I got a "swap_pager: indefinite wait buffer" notice and looked it up. (This was on a rpi2 booted (kernel and world) from a USB SSD, swap partition in use instead of a swap file. It was building devel/cmake via poudriere-devel .) https://www.freebsd.org/doc/faq/troubleshoot.html#indefinite-wait-buffer reads like it is for page-out to disk: QUOTE 5.9. What does the error swap_pager: indefinite wait buffer: mean? This means that a process is trying to page memory to disk, and the page = attempt has hung trying to access the disk for more than 20 seconds. It = might be caused by bad blocks on the disk drive, disk wiring, cables, or = any other disk I/O-related hardware. If the drive itself is bad, disk = errors will appear in /var/log/messages and in the output of dmesg. = Otherwise, check the cables and connections. ENDQUOTE But the code containing the message is for "swread": (head -r326888) # grep -r "indefinite wait buffer" /usr/src/sys/ | more /usr/src/sys/vm/swap_pager.c:"swap_pager: indefinite wait buffer: = bufobj: %p, blkno: %jd, size: %ld\n", Looking there. . . static int swap_pager_getpages(vm_object_t object, vm_page_t *m, int count, int = *rbehind, int *rahead) { . . . VM_OBJECT_WLOCK(object); while ((m[0]->oflags & VPO_SWAPINPROG) !=3D 0) { m[0]->oflags |=3D VPO_SWAPSLEEP; VM_CNT_INC(v_intrans); if (VM_OBJECT_SLEEP(object, &object->paging_in_progress, = PSWP, "swread", hz * 20)) { printf( "swap_pager: indefinite wait buffer: bufobj: %p, blkno: %jd, size: = %ld\n", bp->b_bufobj, (intmax_t)bp->b_blkno, = bp->b_bcount); } } . . . =3D=3D=3D Mark Millard markmi at dsl-only.net
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