[Bug 271991] Crash on some network packets with fresh stable
- In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 271991] Crash on some network packets with fresh stable"
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Date: Mon, 19 Jun 2023 04:25:23 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271991
--- Comment #9 from Ivan Rozhuk <rozhuk.im@gmail.com> ---
This is full list from tcpdump:
[155] Fatal trap 12: page fault while in kernel mode
[155] cpuid = 1; apic id = 01
[155] fault virtual address = 0x2dd
[155] fault code = supervisor read data, page not present
[155] instruction pointer = 0x20:0xffffffff807246d3
[155] stack pointer = 0x28:0xfffffe015c814250
[155] frame pointer = 0x28:0xfffffe015c8142c0
[155] code segment = base 0x0, limit 0xfffff, type 0x1b
[155] = DPL 0, pres 1, long 1, def32 0, gran 1
[155] processor eflags = interrupt enabled, resume, IOPL = 0
[155] current process = 54569 (nginx)
[155] trap number = 12
[155] panic: page fault
[155] cpuid = 1
[155] time = 1687145826
[155] KDB: stack backtrace:
[155] #0 0xffffffff80665e1b at kdb_backtrace+0x6b
[155] #1 0xffffffff8061bff2 at vpanic+0x152
[155] #2 0xffffffff8061be93 at panic+0x43
[155] #3 0xffffffff8093b2a7 at trap_fatal+0x387
[155] #4 0xffffffff8093b2ff at trap_pfault+0x4f
[155] #5 0xffffffff809121ce at calltrap+0x8
[155] #6 0xffffffff8071fdba at bpf_mtap+0x10a
[155] #7 0xffffffff807511d4 at iflib_txq_drain+0x3c4
[155] #8 0xffffffff80756303 at drain_ring_lockless+0x63
[155] #9 0xffffffff807561ea at ifmp_ring_enqueue+0x29a
[155] #10 0xffffffff80754409 at iflib_if_transmit+0x239
[155] #11 0xffffffff80737b0b at ether_output_frame+0x9b
[155] #12 0xffffffff8073797d at ether_output+0x6ed
[155] #13 0xffffffff80785106 at ip_output_send+0xe6
[155] #14 0xffffffff80784e33 at ip_output+0xff3
[155] #15 0xffffffff811ac339 at rack_output+0x3ee9
[155] #16 0xffffffff807aeb3f at tcp_usr_send+0x2af
[155] #17 0xffffffff80619902 at vn_sendfile+0x1222
[155] Uptime: 2m35s
[155] Dumping 660 out of 8171
MB:..3%..13%..22%..32%..42%..51%..61%..71%..83%..93%
__curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
55 __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct
pcpu,
(kgdb) #0 __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
#1 doadump (textdump=<optimized out>)
at ../../../sys/kern/kern_shutdown.c:396
#2 0xffffffff8061bbe8 in kern_reboot (howto=260)
at ../../../sys/kern/kern_shutdown.c:484
#3 0xffffffff8061c05f in vpanic (fmt=<optimized out>,
ap=ap@entry=0xfffffe015c8140a0) at ../../../sys/kern/kern_shutdown.c:923
#4 0xffffffff8061be93 in panic (fmt=<unavailable>)
at ../../../sys/kern/kern_shutdown.c:847
#5 0xffffffff8093b2a7 in trap_fatal (frame=0xfffffe015c814190, eva=733)
at ../../../sys/amd64/amd64/trap.c:942
#6 0xffffffff8093b2ff in trap_pfault (frame=0xfffffe015c814190,
usermode=false, signo=<optimized out>, ucode=<optimized out>)
at ../../../sys/amd64/amd64/trap.c:761
#7 <signal handler called>
#8 0xffffffff807246d3 in bpf_filter (pc=0xfffff80070d49448,
p=p@entry=0xfffff800159d5500 "", wirelen=wirelen@entry=1514,
buflen=buflen@entry=0) at ../../../sys/net/bpf_filter.c:261
#9 0xffffffff8071fdba in bpf_mtap (bp=0xfffff800049c3a00,
m=0xfffff800159d5500) at ../../../sys/net/bpf.c:2348
#10 0xffffffff807511d4 in iflib_txq_drain (r=0xfffffe01305b3000, cidx=123,
pidx=<optimized out>) at ../../../sys/net/iflib.c:3989
#11 0xffffffff80756303 in drain_ring_lockless (r=<optimized out>, os=...,
prev=0, budget=32) at ../../../sys/net/mp_ring.c:187
#12 0xffffffff807561ea in ifmp_ring_enqueue (r=0xfffffe01305b3000,
items=<optimized out>, items@entry=0xfffffe015c814538, n=n@entry=1,
budget=budget@entry=32, abdicate=abdicate@entry=0)
at ../../../sys/net/mp_ring.c:470
#13 0xffffffff80754409 in iflib_if_transmit (ifp=<optimized out>,
m=0xfffff800159d5500) at ../../../sys/net/iflib.c:4327
#14 0xffffffff80737b0b in ether_output_frame (ifp=0xfffff80004ec2000, m=0x50,
m@entry=0xfffff800159d5500) at ../../../sys/net/if_ethersubr.c:514
#15 0xffffffff8073797d in ether_output (ifp=<optimized out>,
m=0xfffff800159d5500, dst=<optimized out>, ro=<optimized out>)
at ../../../sys/net/if_ethersubr.c:441
#16 0xffffffff80785106 in ip_output_send (inp=inp@entry=0xfffff801242bad90,
ifp=0x14, m=0x50, gw=0xfffffe38, gw@entry=0xfffff801242baf40, ro=0x0,
ro@entry=0xfffff801242baf20, stamp_tag=<optimized out>)
at ../../../sys/netinet/ip_output.c:277
#17 0xffffffff80784e33 in ip_output (m=<optimized out>,
m@entry=0xfffff800159d5500, opt=opt@entry=0x0, ro=<optimized out>,
ro@entry=0xfffff801242baf20, flags=0, imo=imo@entry=0x0,
inp=0xfffff801242bad90) at ../../../sys/netinet/ip_output.c:799
#18 0xffffffff811ac339 in rack_output (tp=0xfffffe015c6e60e0)
at ../../../../../../../../../../sys/netinet/tcp_stacks/rack.c:18270
#19 0xffffffff807aeb3f in tcp_usr_send (so=0xfffff800156ddb10, flags=0,
m=<optimized out>, nam=0x0, control=<optimized out>,
td=0xfffffe015c5c0e40) at ../../../sys/netinet/tcp_usrreq.c:1178
#20 0xffffffff80619902 in vn_sendfile (fp=<optimized out>, sockfd=9,
hdr_uio=0x0, trl_uio=0x0, offset=<optimized out>, nbytes=4194304,
sent=0xfffffe015c814dd0, flags=1, td=0xfffffe015c5c0e40)
at ../../../sys/kern/kern_sendfile.c:1188
#21 0xffffffff8061a766 in fo_sendfile (fp=0x14, sockfd=80,
hdr_uio=0xfffffe38, trl_uio=0x0, offset=0, nbytes=18446741880533238416,
sent=0xfffffe015c814dd0, flags=733, td=0xfffffe015c5c0e40)
at ../../../sys/sys/file.h:416
#22 sendfile (uap=0xfffffe015c5c1228, td=<optimized out>,
compat=<optimized out>) at ../../../sys/kern/kern_sendfile.c:1326
#23 sys_sendfile (td=0xfffffe015c5c0e40, uap=0xfffffe015c5c1228)
at ../../../sys/kern/kern_sendfile.c:1354
#24 0xffffffff8093bb50 in syscallenter (td=0xfffffe015c5c0e40)
at ../../../sys/amd64/amd64/../../kern/subr_syscall.c:190
#25 amd64_syscall (td=0xfffffe015c5c0e40, traced=0)
at ../../../sys/amd64/amd64/trap.c:1183
#26 <signal handler called>
#27 0x000000080081e2ba in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffffffdaf8
(kgdb)
This is full list from:
ng_bpf_enable="YES"
ng_bpf_profiles="lan0"
ng_bpf_lan0_in="ip and tcp and tcp port 80 and tcp[1024] != 0"
ng_bpf_lan0_out="ip and tcp and tcp port 80 and tcp[1024] != 0"
My original config was:
ng_bpf_enable="YES"
ng_bpf_profiles="vlan886"
ng_bpf_vlan886_in="ip and tcp and ip[6] & 64 = 0 and ip[8]>128 and
tcp[tcpflags] == tcp-rst"
it filters only incoming from internet packets from intel i211 adapter.
[235] Fatal trap 12: page fault while in kernel mode
[235] cpuid = 0; apic id = 00
[235] fault virtual address = 0x2dd
[235] fault code = supervisor read data, page not present
[235] instruction pointer = 0x20:0xffffffff818f7e93
[235] stack pointer = 0x28:0xfffffe015b3e13e0
[235] frame pointer = 0x28:0xfffffe015b3e1450
[235] code segment = base 0x0, limit 0xfffff, type 0x1b
[235] = DPL 0, pres 1, long 1, def32 0, gran 1
[235] processor eflags = interrupt enabled, resume, IOPL = 0
[235] current process = 66911 (nginx)
[235] trap number = 12
[235] panic: page fault
[235] cpuid = 0
[235] time = 1687147722
[235] KDB: stack backtrace:
[235] #0 0xffffffff80665e1b at kdb_backtrace+0x6b
[235] #1 0xffffffff8061bff2 at vpanic+0x152
[235] #2 0xffffffff8061be93 at panic+0x43
[235] #3 0xffffffff8093b2a7 at trap_fatal+0x387
[235] #4 0xffffffff8093b2ff at trap_pfault+0x4f
[235] #5 0xffffffff809121ce at calltrap+0x8
[235] #6 0xffffffff818f756a at ng_bpf_rcvdata+0xda
[235] #7 0xffffffff818ee777 at ng_apply_item+0x207
[235] #8 0xffffffff818ee25c at ng_snd_item+0x1cc
[235] #9 0xffffffff818e8bdd at ng_ether_output+0x5d
[235] #10 0xffffffff80737957 at ether_output+0x6c7
[235] #11 0xffffffff80785106 at ip_output_send+0xe6
[235] #12 0xffffffff80784e33 at ip_output+0xff3
[235] #13 0xffffffff811af339 at rack_output+0x3ee9
[235] #14 0xffffffff807aeb3f at tcp_usr_send+0x2af
[235] #15 0xffffffff80619902 at vn_sendfile+0x1222
[235] #16 0xffffffff8061a766 at sys_sendfile+0xe6
[235] #17 0xffffffff8093bb50 at amd64_syscall+0xd0
[235] Uptime: 3m55s
[235] Dumping 646 out of 8171
MB:..3%..13%..23%..33%..43%..52%..62%..72%..82%..92%
__curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
55 __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct
pcpu,
(kgdb) #0 __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
#1 doadump (textdump=<optimized out>)
at ../../../sys/kern/kern_shutdown.c:396
#2 0xffffffff8061bbe8 in kern_reboot (howto=260)
at ../../../sys/kern/kern_shutdown.c:484
#3 0xffffffff8061c05f in vpanic (fmt=<optimized out>,
ap=ap@entry=0xfffffe015b3e1230) at ../../../sys/kern/kern_shutdown.c:923
#4 0xffffffff8061be93 in panic (fmt=<unavailable>)
at ../../../sys/kern/kern_shutdown.c:847
#5 0xffffffff8093b2a7 in trap_fatal (frame=0xfffffe015b3e1320, eva=733)
at ../../../sys/amd64/amd64/trap.c:942
#6 0xffffffff8093b2ff in trap_pfault (frame=0xfffffe015b3e1320,
usermode=false, signo=<optimized out>, ucode=<optimized out>)
at ../../../sys/amd64/amd64/trap.c:761
#7 <signal handler called>
#8 0xffffffff818f7e93 in bpf_filter (pc=0xfffff80004e3c1bc,
p=0xfffff800a9815500 "", wirelen=1514, buflen=0)
at ../../../../../../../../../../sys/net/bpf_filter.c:261
#9 0xffffffff818f756a in ng_bpf_rcvdata (hook=<optimized out>,
item=0xfffff800a9239980)
at ../../../../../../../../../../sys/netgraph/ng_bpf.c:475
#10 0xffffffff818ee777 in ng_apply_item (node=node@entry=0xfffff80004e3c200,
item=item@entry=0xfffff800a9239980, rw=-456)
at ../../../../../../../../../../sys/netgraph/ng_base.c:2406
#11 0xffffffff818ee25c in ng_snd_item (item=item@entry=0xfffff800a9239980,
flags=flags@entry=0)
at ../../../../../../../../../../sys/netgraph/ng_base.c:2323
#12 0xffffffff818e8bdd in ng_ether_output (ifp=<optimized out>,
mp=0xfffffe015b3e15c8)
at ../../../../../../../../../../sys/netgraph/ng_ether.c:294
#13 0xffffffff80737957 in ether_output (ifp=<optimized out>,
m=0xfffff800a9815500, dst=<optimized out>, ro=<optimized out>)
at ../../../sys/net/if_ethersubr.c:431
#14 0xffffffff80785106 in ip_output_send (inp=inp@entry=0xfffff800a96ffba0,
ifp=0x14, m=0x50, gw=0xfffffe38, gw@entry=0xfffff800a96ffd50, ro=0x0,
ro@entry=0xfffff800a96ffd30, stamp_tag=<optimized out>)
at ../../../sys/netinet/ip_output.c:277
#15 0xffffffff80784e33 in ip_output (m=<optimized out>,
m@entry=0xfffff800a9815500, opt=opt@entry=0x0, ro=<optimized out>,
ro@entry=0xfffff800a96ffd30, flags=0, imo=imo@entry=0x0,
inp=0xfffff800a96ffba0) at ../../../sys/netinet/ip_output.c:799
#16 0xffffffff811af339 in rack_output (tp=0xfffffe015c6fd0e0)
at ../../../../../../../../../../sys/netinet/tcp_stacks/rack.c:18270
#17 0xffffffff807aeb3f in tcp_usr_send (so=0xfffff80004ef2760, flags=0,
m=<optimized out>, nam=0x0, control=<optimized out>,
td=0xfffffe00dec7bac0) at ../../../sys/netinet/tcp_usrreq.c:1178
#18 0xffffffff80619902 in vn_sendfile (fp=<optimized out>, sockfd=11,
hdr_uio=0x0, trl_uio=0x0, offset=<optimized out>, nbytes=4194304,
sent=0xfffffe015b3e1dd0, flags=1, td=0xfffffe00dec7bac0)
at ../../../sys/kern/kern_sendfile.c:1188
#19 0xffffffff8061a766 in fo_sendfile (fp=0x14, sockfd=80,
hdr_uio=0xfffffe38, trl_uio=0x0, offset=0, nbytes=18446741880512058400,
sent=0xfffffe015b3e1dd0, flags=733, td=0xfffffe00dec7bac0)
at ../../../sys/sys/file.h:416
#20 sendfile (uap=0xfffffe00dec7bea8, td=<optimized out>,
compat=<optimized out>) at ../../../sys/kern/kern_sendfile.c:1326
#21 sys_sendfile (td=0xfffffe00dec7bac0, uap=0xfffffe00dec7bea8)
at ../../../sys/kern/kern_sendfile.c:1354
#22 0xffffffff8093bb50 in syscallenter (td=0xfffffe00dec7bac0)
at ../../../sys/amd64/amd64/../../kern/subr_syscall.c:190
#23 amd64_syscall (td=0xfffffe00dec7bac0, traced=0)
at ../../../sys/amd64/amd64/trap.c:1183
#24 <signal handler called>
#25 0x000000080081e2ba in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffffffdaf8
My patch did not fix issue (even in my netgraph case) :(
But stack trace is different now:
[71] Fatal trap 12: page fault while in kernel mode
[71] cpuid = 1; apic id = 01
[71] fault virtual address = 0x2dd
[71] fault code = supervisor read data, page not present
[71] instruction pointer = 0x20:0xffffffff818f7e93
[71] stack pointer = 0x28:0xfffffe00c4f82490
[71] frame pointer = 0x28:0xfffffe00c4f82500
[71] code segment = base 0x0, limit 0xfffff, type 0x1b
[71] = DPL 0, pres 1, long 1, def32 0, gran 1
[71] processor eflags = interrupt enabled, resume, IOPL = 0
[71] current process = 11 (irq40: ahci0:ch0)
[71] trap number = 12
[71] panic: page fault
[71] cpuid = 1
[71] time = 1687148175
[71] KDB: stack backtrace:
[71] #0 0xffffffff80665e1b at kdb_backtrace+0x6b
[71] #1 0xffffffff8061bff2 at vpanic+0x152
[71] #2 0xffffffff8061be93 at panic+0x43
[71] #3 0xffffffff8093b377 at trap_fatal+0x387
[71] #4 0xffffffff8093b3cf at trap_pfault+0x4f
[71] #5 0xffffffff8091229e at calltrap+0x8
[71] #6 0xffffffff818f756a at ng_bpf_rcvdata+0xda
[71] #7 0xffffffff818ee777 at ng_apply_item+0x207
[71] #8 0xffffffff818ee25c at ng_snd_item+0x1cc
[71] #9 0xffffffff818e8bdd at ng_ether_output+0x5d
[71] #10 0xffffffff80737a27 at ether_output+0x6c7
[71] #11 0xffffffff807851d6 at ip_output_send+0xe6
[71] #12 0xffffffff80784f03 at ip_output+0xff3
[71] #13 0xffffffff811af339 at rack_output+0x3ee9
[71] #14 0xffffffff807af255 at tcp_usr_ready+0xf5
[71] #15 0xffffffff8061a3f7 at sendfile_iodone+0x107
[71] #16 0xffffffff808c0be3 at vnode_pager_generic_getpages_done_async+0x43
[71] #17 0xffffffff806cd448 at bufdone+0x48
[71] Uptime: 1m11s
[71] Dumping 642 out of 8171
MB:..3%..13%..23%..33%..43%..53%..63%..73%..83%..93%
__curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
55 __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct
pcpu,
(kgdb) #0 __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
#1 doadump (textdump=<optimized out>)
at ../../../sys/kern/kern_shutdown.c:396
#2 0xffffffff8061bbe8 in kern_reboot (howto=260)
at ../../../sys/kern/kern_shutdown.c:484
#3 0xffffffff8061c05f in vpanic (fmt=<optimized out>,
ap=ap@entry=0xfffffe00c4f822e0) at ../../../sys/kern/kern_shutdown.c:923
#4 0xffffffff8061be93 in panic (fmt=<unavailable>)
at ../../../sys/kern/kern_shutdown.c:847
#5 0xffffffff8093b377 in trap_fatal (frame=0xfffffe00c4f823d0, eva=733)
at ../../../sys/amd64/amd64/trap.c:942
#6 0xffffffff8093b3cf in trap_pfault (frame=0xfffffe00c4f823d0,
usermode=false, signo=<optimized out>, ucode=<optimized out>)
at ../../../sys/amd64/amd64/trap.c:761
#7 <signal handler called>
#8 0xffffffff818f7e93 in bpf_filter (pc=0xfffff80001a399bc,
p=0xfffff800147cc700 "", wirelen=1514, buflen=0)
at ../../../../../../../../../../sys/net/bpf_filter.c:261
#9 0xffffffff818f756a in ng_bpf_rcvdata (hook=<optimized out>,
item=0xfffff80014de8c80)
at ../../../../../../../../../../sys/netgraph/ng_bpf.c:475
#10 0xffffffff818ee777 in ng_apply_item (node=node@entry=0xfffff800019e9800,
item=item@entry=0xfffff80014de8c80, rw=-456)
at ../../../../../../../../../../sys/netgraph/ng_base.c:2406
#11 0xffffffff818ee25c in ng_snd_item (item=item@entry=0xfffff80014de8c80,
flags=flags@entry=0)
at ../../../../../../../../../../sys/netgraph/ng_base.c:2323
#12 0xffffffff818e8bdd in ng_ether_output (ifp=<optimized out>,
mp=0xfffffe00c4f82678)
at ../../../../../../../../../../sys/netgraph/ng_ether.c:294
#13 0xffffffff80737a27 in ether_output (ifp=<optimized out>,
m=0xfffff800147cc700, dst=<optimized out>, ro=<optimized out>)
at ../../../sys/net/if_ethersubr.c:431
#14 0xffffffff807851d6 in ip_output_send (inp=inp@entry=0xfffff80084ad7ba0,
ifp=0x14, m=0x50, gw=0xfffffe38, gw@entry=0xfffff80084ad7d50, ro=0x0,
ro@entry=0xfffff80084ad7d30, stamp_tag=<optimized out>)
at ../../../sys/netinet/ip_output.c:277
#15 0xffffffff80784f03 in ip_output (m=<optimized out>,
m@entry=0xfffff800147cc700, opt=opt@entry=0x0, ro=<optimized out>,
ro@entry=0xfffff80084ad7d30, flags=0, imo=imo@entry=0x0,
inp=0xfffff80084ad7ba0) at ../../../sys/netinet/ip_output.c:799
#16 0xffffffff811af339 in rack_output (tp=0xfffffe015c738950)
at ../../../../../../../../../../sys/netinet/tcp_stacks/rack.c:18270
#17 0xffffffff807af255 in tcp_usr_ready (so=<optimized out>,
m=0xfffff800147d2700, count=512) at ../../../sys/netinet/tcp_usrreq.c:1302
#18 0xffffffff8061a3f7 in sendfile_iodone (arg=0xfffffe015c741000,
pa=0xfffffe013057e638, count=<optimized out>, error=<optimized out>)
at ../../../sys/kern/kern_sendfile.c:399
#19 0xffffffff808c0be3 in vnode_pager_generic_getpages_done_async (
bp=0xfffffe013057e500) at ../../../sys/vm/vnode_pager.c:1121
#20 0xffffffff806cd448 in bufdone (bp=0xfffffe013057e500)
at ../../../sys/kern/vfs_bio.c:4547
#21 0xffffffff8057b18e in g_io_deliver (bp=0xfffff800019a9178, error=0)
at ../../../sys/geom/geom_io.c:687
#22 0xffffffff8057b18e in g_io_deliver (bp=0xfffff80004dd82f0, error=0)
at ../../../sys/geom/geom_io.c:687
#23 0xffffffff8057b18e in g_io_deliver (bp=bp@entry=0xfffff80004dda000,
error=0) at ../../../sys/geom/geom_io.c:687
#24 0xffffffff80578419 in g_disk_done (bp=0xfffff80004e41000)
at ../../../sys/geom/geom_disk.c:259
#25 0xffffffff802d4c00 in xpt_done_process (
ccb_h=ccb_h@entry=0xfffff80084166000) at ../../../sys/cam/cam_xpt.c:5435
#26 0xffffffff802d4827 in xpt_done_direct (done_ccb=0xfffff80084166000)
at ../../../sys/cam/cam_xpt.c:4616
#27 0xffffffff80416545 in ahci_ch_intr_direct (arg=0xfffffe00c51c1000)
at ../../../sys/dev/ahci/ahci.c:1355
#28 0xffffffff80414db3 in ahci_intr_one (data=<optimized out>)
at ../../../sys/dev/ahci/ahci.c:556
#29 0xffffffff805e6e31 in intr_event_execute_handlers (ie=0xfffff800018d3c00,
p=<optimized out>) at ../../../sys/kern/kern_intr.c:1169
#30 ithread_execute_handlers (ie=0xfffff800018d3c00, p=<optimized out>)
at ../../../sys/kern/kern_intr.c:1182
#31 ithread_loop (arg=0xfffff80001c69000)
at ../../../sys/kern/kern_intr.c:1270
#32 0xffffffff805e3b96 in fork_exit (
callout=0xffffffff805e6bf0 <ithread_loop>, arg=0xfffff80001c69000,
frame=0xfffffe00c4f82f40) at ../../../sys/kern/kern_fork.c:1094
#33 <signal handler called>
#34 0xfffffe00c4d82fd0 in ?? ()
Backtrace stopped: Cannot access memory at address 0x0
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