[Bug 253158] Panic: snapacct_ufs2: bad block - Non-suJ mksnap_ffs(8) crash
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Sat Feb 13 00:38:05 UTC 2021
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253158
--- Comment #18 from Cy Schubert <cy at FreeBSD.org> ---
slippy# kgdb /alt/vm64/root/usr/lib/debug/boot/kernel/kernel.debug vmcore.0
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Reading symbols from /alt/vm64/root/usr/lib/debug/boot/kernel/kernel.debug...
Unread portion of the kernel message buffer:
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0x30
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xffffffff809feb04
stack pointer = 0x28:0xfffffe0097a84580
frame pointer = 0x28:0xfffffe0097a845c0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 1154 (fstyp)
trap number = 12
panic: page fault
cpuid = 0
time = 1613173364
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0097a84230
vpanic() at vpanic+0x181/frame 0xfffffe0097a84280
panic() at panic+0x43/frame 0xfffffe0097a842e0
trap_fatal() at trap_fatal+0x387/frame 0xfffffe0097a84340
trap_pfault() at trap_pfault+0x4f/frame 0xfffffe0097a843a0
trap() at trap+0x27d/frame 0xfffffe0097a844b0
calltrap() at calltrap+0x8/frame 0xfffffe0097a844b0
--- trap 0xc, rip = 0xffffffff809feb04, rsp = 0xfffffe0097a84580, rbp =
0xfffffe0097a845c0 ---
pmap_map_io_transient() at pmap_map_io_transient+0x44/frame 0xfffffe0097a845c0
pmap_copy_pages() at pmap_copy_pages+0xa7/frame 0xfffffe0097a84650
vn_io_fault_pgmove() at vn_io_fault_pgmove+0x99/frame 0xfffffe0097a84680
ffs_read() at ffs_read+0x2e7/frame 0xfffffe0097a84710
VOP_READ_APV() at VOP_READ_APV+0x1f/frame 0xfffffe0097a84730
vn_read() at vn_read+0x1ed/frame 0xfffffe0097a847b0
vn_io_fault_doio() at vn_io_fault_doio+0x43/frame 0xfffffe0097a84810
vn_io_fault1() at vn_io_fault1+0x2c4/frame 0xfffffe0097a84960
vn_io_fault() at vn_io_fault+0x1a4/frame 0xfffffe0097a849e0
dofileread() at dofileread+0x81/frame 0xfffffe0097a84a30
kern_preadv() at kern_preadv+0x62/frame 0xfffffe0097a84a70
sys_pread() at sys_pread+0x8a/frame 0xfffffe0097a84ac0
amd64_syscall() at amd64_syscall+0x10c/frame 0xfffffe0097a84bf0
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0097a84bf0
--- syscall (475, FreeBSD ELF64, sys_pread), rip = 0x2c0408fa, rsp =
0x7fffffffe258, rbp = 0x7fffffffe280 ---
Uptime: 2m31s
Dumping 163 out of 480 MB:..10%..20%..30%..40%..49%..59%..69%..79%..89%..98%
__curthread () at /opt/src/git-src/sys/amd64/include/pcpu_aux.h:55
55 __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct
pcpu,
(kgdb) bt
#0 __curthread () at /opt/src/git-src/sys/amd64/include/pcpu_aux.h:55
#1 doadump (textdump=textdump at entry=1) at
/opt/src/git-src/sys/kern/kern_shutdown.c:399
#2 0xffffffff806b7b4b in kern_reboot (howto=260) at
/opt/src/git-src/sys/kern/kern_shutdown.c:486
#3 0xffffffff806b7fd0 in vpanic (fmt=<optimized out>, ap=<optimized out>)
at /opt/src/git-src/sys/kern/kern_shutdown.c:919
#4 0xffffffff806b7dd3 in panic (fmt=<unavailable>) at
/opt/src/git-src/sys/kern/kern_shutdown.c:843
#5 0xffffffff80a0f6d7 in trap_fatal (frame=0xfffffe0097a844c0, eva=48)
at /opt/src/git-src/sys/amd64/amd64/trap.c:915
#6 0xffffffff80a0f72f in trap_pfault (frame=frame at entry=0xfffffe0097a844c0,
usermode=false,
signo=<optimized out>, signo at entry=0x0, ucode=<optimized out>,
ucode at entry=0x0)
at /opt/src/git-src/sys/amd64/amd64/trap.c:732
#7 0xffffffff80a0ed8d in trap (frame=0xfffffe0097a844c0)
at /opt/src/git-src/sys/amd64/amd64/trap.c:398
#8 <signal handler called>
#9 0xffffffff809feb04 in pmap_map_io_transient
(page=page at entry=0xfffffe0097a845d0,
vaddr=vaddr at entry=0xfffffe0097a84610, count=count at entry=2,
can_fault=can_fault at entry=0)
at /opt/src/git-src/sys/amd64/amd64/pmap.c:9979
#10 0xffffffff809fea17 in pmap_copy_pages (ma=0xfffffe0001312f00, a_offset=0,
mb=0xfffffe0097a7ca60, b_offset=0, xfersize=xfersize at entry=32768)
at /opt/src/git-src/sys/amd64/amd64/pmap.c:7825
#11 0xffffffff807b4109 in vn_io_fault_pgmove (ma=0x0, offset=<optimized out>,
offset at entry=0,
xfersize=xfersize at entry=32768, uio=uio at entry=0xfffffe0097a848b0)
at /opt/src/git-src/sys/kern/vfs_vnops.c:1513
#12 0xffffffff80937497 in ffs_read (ap=<optimized out>)
at /opt/src/git-src/sys/ufs/ffs/ffs_vnops.c:789
#13 0xffffffff80a5264f in VOP_READ_APV (vop=0xffffffff80ce8588 <ffs_vnodeops2>,
a=a at entry=0xfffffe0097a84760) at vnode_if.c:1050
#14 0xffffffff807b7c8d in VOP_READ (vp=0xfffff800065f65b8,
uio=0xfffffe0097a848b0, ioflag=0,
cred=<optimized out>) at ./vnode_if.h:542
#15 vn_read (fp=0xfffff8000004d000, uio=0xfffffe0097a848b0,
active_cred=0xfffff80007a66b00,
flags=<optimized out>, td=<optimized out>) at
/opt/src/git-src/sys/kern/vfs_vnops.c:1027
#16 0xffffffff807b79f3 in vn_io_fault_doio (args=args at entry=0xfffffe0097a84970,
uio=uio at entry=0xfffffe0097a848b0, td=0xfffffe009781b100)
at /opt/src/git-src/sys/kern/vfs_vnops.c:1174
#17 0xffffffff807b3a54 in vn_io_fault1 (vp=<optimized out>,
uio=uio at entry=0xfffffe0097a84a80,
args=args at entry=0xfffffe0097a84970, td=td at entry=0xfffffe009781b100)
at /opt/src/git-src/sys/kern/vfs_vnops.c:1342
#18 0xffffffff807b0fc4 in vn_io_fault (fp=<optimized out>,
uio=0xfffffe0097a84a80,
active_cred=<optimized out>, flags=<optimized out>, td=<optimized out>)
at /opt/src/git-src/sys/kern/vfs_vnops.c:1414
#19 0xffffffff807281f1 in fo_read (fp=0xfffff8000004d000,
uio=0xfffffe0097a84a80, active_cred=0x2,
flags=-1750577984, td=0xfffffe009781b100) at
/opt/src/git-src/sys/sys/file.h:330
#20 dofileread (td=td at entry=0xfffffe009781b100, fd=fd at entry=3,
fp=0xfffff8000004d000,
auio=auio at entry=0xfffffe0097a84a80, offset=<optimized out>,
offset at entry=20676608,
flags=<optimized out>, flags at entry=1) at
/opt/src/git-src/sys/kern/sys_generic.c:369
#21 0xffffffff80727fc2 in kern_preadv (td=0xfffffe009781b100, fd=3,
auio=auio at entry=0xfffffe0097a84a80, offset=20676608)
at /opt/src/git-src/sys/kern/sys_generic.c:335
#22 0xffffffff80727eca in kern_pread (td=<optimized out>, fd=-1750579696,
buf=<optimized out>,
nbyte=18446741877230685376, offset=0) at
/opt/src/git-src/sys/kern/sys_generic.c:244
#23 sys_pread (td=0xfffffe0097a845d0, uap=<optimized out>)
at /opt/src/git-src/sys/kern/sys_generic.c:226
#24 0xffffffff80a0ffdc in syscallenter (td=0xfffffe009781b100)
at /opt/src/git-src/sys/amd64/amd64/../../kern/subr_syscall.c:189
#25 amd64_syscall (td=0xfffffe009781b100, traced=0) at
/opt/src/git-src/sys/amd64/amd64/trap.c:1156
#26 <signal handler called>
#27 0x000000002c0408fa in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffffffe258
(kgdb)
(kgdb) p page[i]
value has been optimized out
(kgdb) p i
$16 = <optimized out>
(kgdb) p count
$17 = 2
(kgdb) p page[0]
$18 = (vm_page_t) 0xfffffe00005807e8
(kgdb) p page[1]
$19 = (vm_page_t) 0x0
(kgdb)
(kgdb) up
#10 0xffffffff809fea17 in pmap_copy_pages (ma=0xfffffe0001312f00, a_offset=0,
mb=0xfffffe0097a7ca60, b_offset=0, xfersize=xfersize at entry=32768)
at /opt/src/git-src/sys/amd64/amd64/pmap.c:7825
7825 mapped = pmap_map_io_transient(pages, vaddr, 2, FALSE);
(kgdb) p pages
$20 = {0xfffffe00005807e8, 0x0}
(kgdb) p vaddr
$21 = {18446735277843750912, 18446735277723444664}
(kgdb)
(kgdb) up
#10 0xffffffff809fea17 in pmap_copy_pages (ma=0xfffffe0001312f00, a_offset=0,
mb=0xfffffe0097a7ca60, b_offset=0, xfersize=xfersize at entry=32768)
at /opt/src/git-src/sys/amd64/amd64/pmap.c:7825
7825 mapped = pmap_map_io_transient(pages, vaddr, 2, FALSE);
(kgdb) p pages
$20 = {0xfffffe00005807e8, 0x0}
(kgdb) p vaddr
$21 = {18446735277843750912, 18446735277723444664}
(kgdb)
(kgdb) l
7820 pages[0] = ma[a_offset >> PAGE_SHIFT];
7821 b_pg_offset = b_offset & PAGE_MASK;
7822 pages[1] = mb[b_offset >> PAGE_SHIFT];
7823 cnt = min(xfersize, PAGE_SIZE - a_pg_offset);
7824 cnt = min(cnt, PAGE_SIZE - b_pg_offset);
7825 mapped = pmap_map_io_transient(pages, vaddr, 2, FALSE);
7826 a_cp = (char *)vaddr[0] + a_pg_offset;
7827 b_cp = (char *)vaddr[1] + b_pg_offset;
7828 bcopy(a_cp, b_cp, cnt);
7829 if (__predict_false(mapped))
(kgdb) p pages[0]
$22 = (vm_page_t) 0xfffffe00005807e8
(kgdb) p pages[1]
$23 = (vm_page_t) 0x0
(kgdb) p b_offset
$24 = 0
(kgdb) p a_offset
$25 = 0
(kgdb) p ma[0]
$26 = (vm_page_t) 0xfffffe00005807e8
(kgdb) p mb[0]
$27 = (vm_page_t) 0x0
(kgdb)
Break time is over.
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