protection fault in __asan_load4

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syzbot

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May 18, 2022, 4:21:27 PM5/18/22

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Hello,

syzbot found the following issue on:

HEAD commit: 3cd2f3e723f9 ubsec(4): Nix dead code.
git tree: netbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=149fd945f00000
kernel config: https://syzkaller.appspot.com/x/.config?x=fab579639ba4bf0a
dashboard link: https://syzkaller.appspot.com/bug?extid=57ddb63a3d1d3299ef18
compiler: g++ (Debian 10.2.1-6) 10.2.1 20210110

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+57ddb6...@syzkaller.appspotmail.com

[ 304.7872545] fatal protection fault in supervisor mode
[ 304.7972488] trap type 4 code 0 rip 0xffffffff81b70d2c cs 0x8 rflags 0x10202 cr2 0x1b2eb25000 ilevel 0 rsp 0xffff9381a6cc7780
[ 304.8072522] curlwp 0xffff938013f6a900 pid 6452.7255 lowest kstack 0xffff9381a6cc02c0
kernel: protection fault trap, code=0
Stopped in pid 6452.7255 (syz-executor.5) at netbsd:__asan_load4+0x62: movzbl 0(%rax),%r8d
?
__asan_load4() at netbsd:__asan_load4+0x62 kasan_shadow_1byte_isvalid sys/kern/subr_asan.c:310 [inline]
__asan_load4() at netbsd:__asan_load4+0x62 kasan_shadow_2byte_isvalid sys/kern/subr_asan.c:323 [inline]
__asan_load4() at netbsd:__asan_load4+0x62 kasan_shadow_4byte_isvalid sys/kern/subr_asan.c:343 [inline]
__asan_load4() at netbsd:__asan_load4+0x62 kasan_shadow_check sys/kern/subr_asan.c:417 [inline]
__asan_load4() at netbsd:__asan_load4+0x62 sys/kern/subr_asan.c:1206
ppptioctl() at netbsd:ppptioctl+0x434 ppprcvframe sys/net/ppp_tty.c:506 [inline]
ppptioctl() at netbsd:ppptioctl+0x434 sys/net/ppp_tty.c:442
comioctl() at netbsd:comioctl+0xed sys/dev/ic/com.c:1301
cdev_ioctl() at netbsd:cdev_ioctl+0x1e7 sys/kern/subr_devsw.c:1223
spec_ioctl() at netbsd:spec_ioctl+0x148 sys/miscfs/specfs/spec_vnops.c:1294
VOP_IOCTL() at netbsd:VOP_IOCTL+0x132 sys/kern/vnode_if.c:934
vn_ioctl() at netbsd:vn_ioctl+0x1b9 sys/kern/vfs_vnops.c:865
sys_ioctl() at netbsd:sys_ioctl+0x8f5 sys/kern/sys_generic.c:673
sys___syscall() at netbsd:sys___syscall+0x10e sy_call sys/sys/syscallvar.h:65 [inline]
sys___syscall() at netbsd:sys___syscall+0x10e sys/kern/sys_syscall.c:90
syscall() at netbsd:syscall+0x25a sy_call sys/sys/syscallvar.h:65 [inline]
syscall() at netbsd:syscall+0x25a sy_invoke sys/sys/syscallvar.h:94 [inline]
syscall() at netbsd:syscall+0x25a sys/arch/x86/x86/syscall.c:138
--- syscall (number 198) ---
netbsd:syscall+0x25a:
Panic string: (null)
PID LID S CPU FLAGS STRUCT LWP * NAME WAIT
6452 >7255 7 1 100 ffff938013f6a900 syz-executor.5
6452 6452 2 1 10000000 ffff9380126c9b80 syz-executor.5
5762 >7858 7 0 0 ffff938012c5a340 syz-executor.0
5762 6828 3 0 1c0 ffff938012ca69c0 syz-executor.0 parked
5762 7214 3 0 1c0 ffff938013f6a4c0 syz-executor.0 parked
5762 5762 2 1 10040140 ffff938012c82080 syz-executor.0
5531 7247 3 1 40180 ffff938012cd5200 syz-executor.2 parked
5531 5531 3 1 10040180 ffff9380126c9740 syz-executor.2 nanoslp
1082 1082 3 1 1c0 ffff938013e2b240 syz-executor.4 pipe_rd
943 943 2 1 140 ffff938013dd3a80 syz-executor.5
1222 1222 3 1 1c0 ffff938013dd3200 syz-executor.3 pipe_rd
1075 1075 2 1 140 ffff938013cb5a40 syz-executor.2
422 422 3 1 1c0 ffff938013cb5600 syz-executor.1 pipe_rd
1223 1223 2 1 140 ffff938013374180 syz-executor.0
1194 1130 3 1 1c0 ffff938013dd3640 syz-fuzzer parked
1194 1105 3 1 180 ffff938013cb51c0 syz-fuzzer parked
1194 1224 3 1 180 ffff938013473580 syz-fuzzer parked
1194 1127 3 0 180 ffff938013473140 syz-fuzzer parked
1194 1220 3 1 180 ffff938013c2fa00 syz-fuzzer kqueue
1194 1113 3 0 180 ffff938013c2f5c0 syz-fuzzer parked
1194 1054 3 0 180 ffff9380133b4ac0 syz-fuzzer parked
1194 1151 2 1 140 ffff9380133b4240 syz-fuzzer
1194 1194 3 0 180 ffff938012aa2900 syz-fuzzer parked
1079 1079 3 1 180 ffff938012a63040 sshd select
1069 1069 3 0 180 ffff93801338ea40 getty nanoslp
1001 1001 3 0 180 ffff93801339da80 getty nanoslp
948 948 3 1 180 ffff93801339d640 getty nanoslp
1068 1068 3 1 180 ffff938013450980 getty ttyraw
1067 1067 3 1 180 ffff93801338e600 sshd select
949 949 3 1 180 ffff938012d40340 powerd kqueue
689 689 3 0 180 ffff9380133c7b00 syslogd kqueue
602 602 3 0 180 ffff938012c1a700 dhcpcd poll
547 547 3 0 180 ffff938012c82900 dhcpcd poll
464 464 3 1 180 ffff938012c4db80 dhcpcd poll
589 589 3 1 180 ffff938012c4d300 dhcpcd poll
289 289 3 0 180 ffff938012d83080 dhcpcd poll
288 288 3 0 180 ffff938012d6c8c0 dhcpcd poll
351 351 3 1 180 ffff938012d6c480 dhcpcd poll
1 1 3 0 180 ffff9380126fd9c0 init wait
0 5630 3 0 40200 ffff938013f05740 ktrace ktrwait
0 6472 3 0 200 ffff9380126c9300 ktrace ktrwait
0 6634 3 0 200 ffff938013444940 ktrace ktrwait
0 5279 3 1 200 ffff93801343a080 ktrace ktrwait
0 6830 3 1 200 ffff938012c8a0c0 ktrace ktrwait
0 5818 3 0 200 ffff938013f05b80 ktrace ktrwait
0 4737 3 1 200 ffff938013f6e100 ktrace ktrwait
0 4599 3 1 200 ffff938012cbaa00 ktrace ktrwait
0 6562 3 0 200 ffff9380129bc2c0 ktrace ktrwait
0 6334 3 0 200 ffff938013f1d340 ktrace ktrwait
0 4493 3 1 200 ffff938012ca6580 ktrace ktrwait
0 5330 3 0 200 ffff938013f6d500 ktrace ktrwait
0 4657 3 1 200 ffff9380133c7280 ktrace ktrwait
0 3622 3 1 200 ffff93801339d200 ktrace ktrwait
0 3311 3 0 200 ffff9380129bc700 ktrace ktrwait
0 4580 3 1 200 ffff938012bd0a40 ktrace ktrwait
0 4146 3 1 200 ffff938012bb35c0 ktrace ktrwait
0 3140 3 0 200 ffff938013360140 ktrace ktrwait
0 3797 3 0 200 ffff9380126cc040 ktrace ktrwait
0 2270 3 0 200 ffff938012c096c0 ktrace ktrwait
0 3430 3 1 200 ffff938012be7a80 ktrace ktrwait
0 1920 3 0 200 ffff938012bd01c0 ktrace ktrwait
0 1679 3 1 200 ffff93801342c040 ktrace ktrwait
0 1616 3 1 200 ffff938012cd5640 ktrace ktrwait
0 2119 3 1 200 ffff938012c76480 ktrace ktrwait
0 2525 3 1 200 ffff938013f70580 ktrace ktrwait
0 971 3 0 200 ffff938012974ac0 physiod physiod
0 194 3 0 200 ffff93801298ab00 pooldrain pooldrain
0 193 3 0 200 ffff93801298a6c0 ioflush syncer
0 192 3 1 200 ffff93801298a280 pgdaemon pgdaemon
0 169 3 1 200 ffff938012974240 usb7 usbevt
0 167 3 1 200 ffff93801292ea80 usb6 usbevt
0 165 3 0 200 ffff93801292e640 usb5 usbevt
0 164 3 0 200 ffff93801292e200 usb4 usbevt
0 31 3 0 200 ffff9380128e0a40 usb3 usbevt
0 63 3 0 200 ffff9380128e0600 usb2 usbevt
0 126 3 0 200 ffff9380128e01c0 usb1 usbevt
0 125 3 1 200 ffff93801286fa00 usb0 usbdly
0 124 3 0 200 ffff93801286f5c0 usbtask-dr usbtsk
0 123 3 0 200 ffff9380120b66c0 usbtask-hc usbtsk
0 122 3 0 200 ffff93801286f180 npfgc0 npfgcw
0 121 3 0 200 ffff9380126fd580 rt_free rt_free
0 120 3 0 200 ffff9380126fd140 unpgc unpgc
0 119 3 0 200 ffff9380126f6980 key_timehandler key_timehandler
0 118 3 1 200 ffff9380126f6540 icmp6_wqinput/1 icmp6_wqinput
0 117 3 0 200 ffff9380126f6100 icmp6_wqinput/0 icmp6_wqinput
0 116 3 1 200 ffff9380126ec940 nd6_timer nd6_timer
0 115 3 1 200 ffff9380126ec500 carp6_wqinput/1 carp6_wqinput
0 114 3 0 200 ffff9380126ec0c0 carp6_wqinput/0 carp6_wqinput
0 113 3 1 200 ffff9380126dd900 carp_wqinput/1 carp_wqinput
0 112 3 0 200 ffff9380126dd4c0 carp_wqinput/0 carp_wqinput
0 111 3 1 200 ffff9380126dd080 icmp_wqinput/1 icmp_wqinput
0 110 3 0 200 ffff9380126cc8c0 icmp_wqinput/0 icmp_wqinput
0 109 3 0 200 ffff9380126cbbc0 rt_timer rt_timer
0 108 3 1 200 ffff9380126cc480 vmem_rehash vmem_rehash
0 99 3 1 200 ffff9380120bbb40 entbutler entropy
0 98 3 0 200 ffff9380120bb700 viomb balloon
0 97 3 1 200 ffff9380120bb2c0 vioif0_txrx/1 vioif0_txrx
0 96 3 0 200 ffff9380120b6b00 vioif0_txrx/0 vioif0_txrx
0 29 3 0 200 ffff9380120b6280 scsibus0 sccomp
0 28 3 0 200 ffff938010cbaac0 pms0 pmsreset
0 27 3 1 200 ffff938010cba680 xcall/1 xcall
0 26 1 1 200 ffff938010cba240 softser/1
0 25 1 1 200 ffff938010cb9a80 softclk/1
0 24 1 1 200 ffff938010cb9640 softbio/1
0 23 1 1 200 ffff938010cb9200 softnet/1
0 22 1 1 201 ffff93800fb55a40 idle/1
0 21 3 0 200 ffff93800fb55600 lnxsyswq lnxsyswq
0 20 3 0 200 ffff93800fb551c0 lnxubdwq lnxubdwq
0 19 3 0 200 ffff93800fb54a00 lnxpwrwq lnxpwrwq
0 18 3 0 200 ffff93800fb545c0 lnxlngwq lnxlngwq
0 17 3 0 200 ffff93800fb54180 lnxhipwq lnxhipwq
0 16 3 0 200 ffff93800fb4b9c0 lnxrcugc lnxrcugc
0 15 3 0 200 ffff93800fb4b580 sysmon smtaskq
0 14 3 0 200 ffff93800fb4b140 pmfsuspend pmfsuspend
0 13 3 0 200 ffff93800fb47980 pmfevent pmfevent
0 12 3 0 200 ffff93800fb47540 sopendfree sopendfr
0 11 3 1 200 ffff93800fb47100 iflnkst iflnkst
0 10 3 0 200 ffff93800fb3c940 nfssilly nfssilly
0 9 3 0 200 ffff93800fb3c500 vdrain vdrain
0 8 3 1 200 ffff93800fb3c0c0 modunload mod_unld
0 7 3 0 200 ffff93800fb33900 xcall/0 xcall
0 6 1 0 200 ffff93800fb334c0 softser/0
0 5 1 0 200 ffff93800fb33080 softclk/0
0 4 1 0 200 ffff93800fb318c0 softbio/0
0 3 1 0 200 ffff93800fb31480 softnet/0
0 2 1 0 201 ffff93800fb31040 idle/0
0 0 3 0 200 ffffffff8333d1c0 swapper uvm
[Locks tracked through LWPs]

****** LWP 6452.7255 (syz-executor.5) @ 0xffff938013f6a900, l_stat=7

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff834709c0 type : sleep/adaptive
initialized : 0xffffffff81afdd91
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 1 last held: 0
relevant lwp : 0xffff938013f6a900 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 547.547 (dhcpcd) @ 0xffff938012c82900, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff834709c0 type : sleep/adaptive
initialized : 0xffffffff81afdd91
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffff938012c82900 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 464.464 (dhcpcd) @ 0xffff938012c4db80, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff834709c0 type : sleep/adaptive
initialized : 0xffffffff81afdd91
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 1 last held: 0
relevant lwp : 0xffff938012c4db80 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 288.288 (dhcpcd) @ 0xffff938012d6c8c0, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff834709c0 type : sleep/adaptive
initialized : 0xffffffff81afdd91
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffff938012d6c8c0 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 351.351 (dhcpcd) @ 0xffff938012d6c480, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff834709c0 type : sleep/adaptive
initialized : 0xffffffff81afdd91
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 1 last held: 0
relevant lwp : 0xffff938012d6c480 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.11 (iflnkst) @ 0xffff93800fb47100, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff834709c0 type : sleep/adaptive
initialized : 0xffffffff81afdd91
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 1 last held: 0
relevant lwp : 0xffff93800fb47100 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.5 (softclk/0) @ 0xffff93800fb33080, l_stat=1

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff834709c0 type : sleep/adaptive
initialized : 0xffffffff81afdd91
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffff93800fb33080 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.0 (swapper) @ 0xffffffff8333d1c0, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff834709c0 type : sleep/adaptive
initialized : 0xffffffff81afdd91
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffffffff8333d1c0 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

[Locks tracked through CPUs]

******* Locks held on cpu1:

* Lock 0 (initialized at main)
lock address : 0xffffffff834708c0 type : spin
initialized : 0xffffffff81f541de
shared holds : 0 exclusive: 1
shares wanted: 0 exclusive: 0
relevant cpu : 1 last held: 1
relevant lwp : 0xffff938013f6a900 last held: 0xffff938013f6a900
last locked* : 0xffffffff81b8a7b6 unlocked : 0xffffffff81b89e21
curcpu holds : 2 wanted by: 000000000000000000

PAGE FLAG PQ UOBJECT UANON
0xffff938000017180 0041 00000000 0x0 0x0
0xffff938000017200 0041 00000000 0x0 0x0
0xffff938000017280 0041 00000000 0x0 0x0
0xffff938000017300 0041 00000000 0x0 0x0
0xffff938000017380 0041 00000000 0x0 0x0
0xffff938000017400 0041 00000000 0x0 0x0
0xffff938000017480 0041 00000000 0x0 0x0
0xffff938000017500 0041 00000000 0x0 0x0
0xffff938000017580 0041 00000000 0x0 0x0
0xffff938000017600 0041 00000000 0x0 0x0
0xffff938000017680 0041 00000000 0x0 0x0
0xffff938000017700 0041 00000000 0x0 0x0
0xffff938000017780 0041 00000000 0x0 0x0
0xffff938000017800 0041 00000000 0x0 0x0
0xffff938000017880 0041 00000000 0x0 0x0
0xffff938000017900 0041 00000000 0x0 0x0
0xffff938000017980 0041 00000000 0x0 0x0
0xffff938000017a00 0041 00000000 0x0 0x0
0xffff938000017a80 0041 00000000 0x0 0x0
0xffff938000017b00 0041 00000000 0x0 0x0
0xffff938000017b80 0041 00000000 0x0 0x0
0xffff938000017c00 0041 00000000 0x0 0x0
0xffff938000017c80 0041 00000000 0x0 0x0
0xffff938000017d00 0041 00000000 0x0 0x0
0xffff938000017d80 0041 00000000 0x0 0x0
0xffff938000017e00 0041 00000000 0x0 0x0
0xffff938000017e80 0041 00000000 0x0 0x0
0xffff938000017f00 0041 00000000 0x0 0x0
0xffff938000017f80 0041 00000000 0x0 0x0
0xffff938000018000 0041 00000000 0x0 0x0
0xffff938000018080 0041 00000000 0x0 0x0
0xffff938000018100 0041 00000000 0x0 0x0
0xffff938000018180 0041 00000000 0x0 0x0
0xffff938000018200 0041 00000000 0x0 0x0
0xffff938000018280 0041 00000000 0x0 0x0
0xffff938000018300 0041 00000000 0x0 0x0
0xffff938000018380 0041 00000000 0x0 0x0
0xffff938000018400 0041 00000000 0x0 0x0
0xffff938000018480 0041 00000000 0x0 0x0
0xffff938000018500 0041 00000000 0x0 0x0
0xffff938000018580 0041 00000000 0x0 0x0
0xffff938000018600 0041 00000000 0x0 0x0
0xffff938000018680 0041 00000000 0x0 0x0
0xffff938000018700 0041 00000000 0x0 0x0
0xffff938000018780 0041 00000000 0x0 0x0
0xffff938000018800 0041 00000000 0x0 0x0
0xffff938000018880 0041 00000000 0x0 0x0
0xffff938000018900 0041 00000000 0x0 0x0
0xffff938000018980 0041 00000000 0x0 0x0
0xffff938000018a00 0041 00000000 0x0 0x0
0xffff938000018a80 0041 00000000 0x0 0x0
0xffff938000018b00 0041 00000000 0x0 0x0
0xffff938000018b80 0041 00000000 0x0 0x0
0xffff938000018c00 0041 00000000 0x0 0x0
0xffff938000018c80 0041 00000000 0x0 0x0
0xffff938000018d00 0041 00000000 0x0 0x0
0xffff938000018d80 0041 00000000 0x0 0x0
0xffff938000018e00 0041 00000000 0x0 0x0
0xffff938000018e80 0041 00000000 0x0 0x0
0xffff938000018f00 0041 00000000 0x0 0x0
0xffff938000018f80 0041 00000000 0x0 0x0
0xffff938000019000 0041 00000000 0x0 0x0
0xffff938000019080 0041 00000000 0x0 0x0
0xffff938000019100 0041 00000000 0x0 0x0
0xffff938000019180 0041 00000000 0x0 0x0
0xffff938000019200 0041 00000000 0x0 0x0
0xffff938000019280 0041 00000000 0x0 0x0
0xffff938000019300 0041 00000000 0x0 0x0
0xffff938000019380 0041 00000000 0x0 0x0
0xffff938000019400 0041 00000000 0x0 0x0
0xffff938000019480 0041 00000000 0x0 0x0
0xffff938000019500 0041 00000000 0x0 0x0
0xffff938000019580 0041 00000000 0x0 0x0
0xffff938000019600 0041 00000000 0x0 0x0
0xffff938000019680 0041 00000000 0x0 0x0
0xffff938000019700 0041 00000000 0x0 0x0
0xffff938000019780 0041 00000000 0x0 0x0
0xffff938000019800 0041 00000000 0x0 0x0
0xffff938000019880 0041 00000000 0x0 0x0
0xffff938000019900 0041 00000000 0x0 0x0
0xffff938000019980 0041 00000000 0x0 0x0
0xffff938000019a00 0041 00000000 0x0 0x0
0xffff938000019a80 0041 00000000 0x0 0x0
0xffff938000019b00 0041 00000000 0x0 0x0
0xffff938000019b80 0041 00000000 0x0 0x0
0xffff938000019c00 0041 00000000 0x0 0x0
0xffff938000019c80 0041 00000000 0x0 0x0
0xffff938000019d00 0041 00000000 0x0 0x0
0xffff938000019d80 0041 00000000 0x0 0x0
0xffff938000019e00 0041 00000000 0x0 0x0
0xffff938000019e80 0041 00000000 0x0 0x0
0xffff938000019f00 0041 00000000 0x0 0x0
0xffff938000019f80 0041 00000000 0x0 0x0
0xffff93800001a000 0041 00000000 0x0 0x0
0xffff93800001a080 0041 00000000 0x0 0x0
0xffff93800001a100 0041 00000000 0x0 0x0
0xffff93800001a180 0041 00000000 0x0 0x0
0xffff93800001a200 0041 00000000 0x0 0x0
0xffff93800001a280 0041 00000000 0x0 0x0
0xffff93800001a300 0041 00000000 0x0 0x0
0xffff93800001a380 0041 00000000 0x0 0x0
0xffff93800001a400 0041 00000000 0x0 0x0
0xffff93800001a480 0041 00000000 0x0 0x0
0xffff93800001a500 0041 00000000 0x0 0x0
0xffff93800001a580 0041 00000000 0x0 0x0
0xffff93800001a600 0041 00000000 0x0 0x0
0xffff93800001a680 0041 00000000 0x0 0x0
0xffff93800001a700 0041 00000000 0x0 0x0
0xffff93800001a780 0041 00000000 0x0 0x0
0xffff93800001a800 0041 00000000 0x0 0x0
0xffff93800001a880 0041 00000000 0x0 0x0
0xffff93800001a900 0041 00000000 0x0 0x0
0xffff93800001a980 0041 00000000 0x0 0x0
0xffff93800001aa00 0041 00000000 0x0 0x0
0xffff93800001aa80 0041 00000000 0x0 0x0
0xffff93800001ab00 0041 00000000 0x0 0x0
0xffff93800001ab80 0041 00000000 0x0 0x0
0xffff93800001ac00 0041 00000000 0x0 0x0
0xffff93800001ac80 0041 00000000 0x0 0x0
0xffff93800001ad00 0041 00000000 0x0 0x0
0xffff93800001ad80 0041 00000000 0x0 0x0
0xffff93800001ae00 0041 00000000 0x0 0x0
0xffff93800001ae80 0041 00000000 0x0 0x0
0xffff93800001af00 0041 00000000 0x0 0x0
0xffff93800001af80 0041 00000000 0x0 0x0
0xffff93800001b000 0041 00000000 0x0 0x0
0xffff93800001b080 0041 00000000 0x0 0x0
0xffff93800001b100 0041 00000000 0x0 0x0
0xffff93800001b180 0041 00000000 0x0 0x0
0xffff93800001b200 0041 00000000 0x0 0x0
0xffff93800001b280 0041 00000000 0x0 0x0
0xffff93800001b300 0041 00000000 0x0 0x0
0xffff93800001b380 0041 00000000 0x0 0x0
0xffff93800001b400 0041 00000000 0x0 0x0
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0xffff938000029400 0001 00000000 0x0 0x0
0xffff938000029480 0001 00000000 0x0 0x0
0xffff938000029500 0001 00000000 0x0 0x0
0xffff938000029580 0001 00000000 0x0 0x0
0xffff938000029600 0001 00000000 0x0 0x0
0xffff938000029680 0001 00000000 0x0 0x0
0xffff938000029700 0001 00000000 0x0 0x0
0xffff938000029780 0001 00000000 0x0 0x0
0xffff938000029800 0001 00000000 0x0 0x0
0xffff938000029880 0001 00000000 0x0 0x0
0xffff938000029900 0001 00000000 0x0 0x0
0xffff938000029980 0001 00000000 0x0 0x0
0xffff938000029a00 0001 00000000 0x0 0x0
0xffff938000029a80 0001 00000000 0x0 0x0
0xffff938000029b00 0001 00000000 0x0 0x0
0xffff938000029b80 0001 00000000 0x0 0x0
0xffff938000029c00 0001 00000000 0x0 0x0
0xffff938000029c80 0001 00000000 0x0 0x0
0xffff938000029d00 0001 00000000 0x0 0x0
0xffff938000029d80 0001 00000000 0x0 0x0
0xffff938000029e00 0001 00000000 0x0 0x0
0xffff938000029e80 0001 00000000 0x0 0x0
0xffff938000029f00 0001 00000000 0x0 0x0
0xffff938000029f80 0001 00000000 0x0 0x0
0xffff93800002a000 0001 00000000 0x0 0x0
0xffff93800002a080 0001 00000000 0x0 0x0
0xffff93800002a100 0001 00000000 0x0 0x0
0xffff93800002a180 0001 00000000 0x0 0x0
0xffff93800002a200 0001 00000000 0x0 0x0
0xffff93800002a280 0001 00000000 0x0 0x0
0xffff93800002a300 0001 00000000 0x0 0x0
0xffff93800002a380 0001 00000000 0x0 0x0
0xffff93800002a400 0001 00000000 0x0 0x0
0xffff93800002a480 0001 00000000 0x0 0x0
0xffff93800002a500 0001 00000000 0x0 0x0
0xffff93800002a580 0001 00000000 0x0 0x0
0xffff93800002a600 0001 00000000 0x0 0x0
0xffff93800002a680 0001 00000000 0x0 0x0
0xffff93800002a700 0001 00000000 0x0 0x0
0xffff93800002a780 0001 00000000 0x0 0x0
0xffff93800002a800 0001 00000000 0x0 0x0
0xffff93800002a880 0001 00000000 0x0 0x0
0xffff93800002a900 0001 00000000 0x0 0x0
0xffff93800002a980 0001 00000000 0x0 0x0
0xffff93800002aa00 0001 00000000 0x0 0x0
0xffff93800002aa80 0001 00000000 0x0 0x0
0xffff93800002ab00 0001 00000000 0x0 0x0
0xffff93800002ab80 0001 00000000 0x0 0x0
0xffff93800002ac00 0001 00000000 0x0 0x0
0xffff93800002ac80 0001 00000000 0x0 0x0
0xffff93800002ad00 0001 00000000 0x0 0x0
0xffff93800002ad80 0001 00000000 0x0 0x0
0xffff93800002ae00 0001 00000000 0x0 0x0
0xffff93800002ae80 0001 00000000 0x0 0x0
0xffff93800002af00 0001 00000000 0x0 0x0
0xffff93800002af80 0001 00000000 0x0 0x0
0xffff93800002b000 0001 00000000 0x0 0x0
0xffff93800002b080 0001 00000000 0x0 0x0
0xffff93800002b100 0001 00000000 0x0 0x0
0xffff93800002b180 0001 00000000 0x0 0x0
0xffff93800002b200 0001 00000000 0x0 0x0
0xffff93800002b280 0001 00000000 0x0 0x0
0xffff93800002b300 0001 00000000 0x0 0x0
0xffff93800002b380 0001 00000000 0x0 0x0
0xffff93800002b400 0001 00000000 0x0 0x0
0xffff93800002b480 0001 00000000 0x0 0x0
0xffff93800002b500 0001 00000000 0x0 0x0
0xffff93800002b580 0001 00000000 0x0 0x0
0xffff93800002b600 0001 00000000 0x0 0x0
0xffff93800002b680 0001 00000000 0x0 0x0
0xffff93800002b700 0001 00000000 0x0 0x0
0xffff93800002b780 0001 00000000 0x0 0x0
0xffff93800002b800 0001 00000000 0x0 0x0
0xffff93800002b880 0001 00000000 0x0 0x0
0xffff93800002b900 0001 00000000 0x0 0x0
0xffff93800002b980 0001 00000000 0x0 0x0
0xffff93800002ba00 0001 00000000 0x0 0x0
0xffff93800002ba80 0001 00000000 0x0 0x0
0xffff93800002bb00 0001 00000000 0x0 0x0
0xffff93800002bb80 0001 00000000 0x0 0x0
0xffff93800002bc00 0001 00000000 0x0 0x0
0xffff93800002bc80 0001 00000000 0x0 0x0
0xffff93800002bd00 0001 00000000 0x0 0x0
0xffff93800002bd80 0001 00000000 0x0 0x0
0xffff93800002be00 0001 00000000 0x0 0x0
0xffff93800002be80 0001 00000000 0x0 0x0
0xffff93800002bf00 0001 00000000 0x0 0x0
0xffff93800002bf80 0001 00000000 0x0 0x0
0xffff93800002c000 0001 00000000 0x0 0x0
0xffff93800002c080 0001 00000000 0x0 0x0
0xffff93800002c100 0001 00000000 0x0 0x0
0xffff93800002c180 0001 00000000 0x0 0x0
0xffff93800002c200 0001 00000000 0x0 0x0
0xffff93800002c280 0001 00000000 0x0 0x0
0xffff93800002c300 0001 00000000 0x0 0x0
0xffff93800002c380 0001 00000000 0x0 0x0
0xffff93800002c400 0001 00000000 0x0 0x0
0xffff93800002c480 0001 00000000 0x0 0x0
0xffff93800002c500 0001 00000000 0x0 0x0
0xffff93800002c580 0001 00000000 0x0 0x0
0xffff93800002c600 0001 00000000

---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

syzbot

unread,

May 18, 2022, 4:35:24 PM5/18/22

to syzkaller-...@googlegroups.com

syzbot has found a reproducer for the following issue on:

HEAD commit: 3cd2f3e723f9 ubsec(4): Nix dead code.
git tree: netbsd

console output: https://syzkaller.appspot.com/x/log.txt?x=130555d9f00000

kernel config: https://syzkaller.appspot.com/x/.config?x=fab579639ba4bf0a
dashboard link: https://syzkaller.appspot.com/bug?extid=57ddb63a3d1d3299ef18
compiler: g++ (Debian 10.2.1-6) 10.2.1 20210110

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=108feb2df00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15b0f7b1f00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+57ddb6...@syzkaller.appspotmail.com

login: [ 43.8672365] fatal protection fault in supervisor mode
[ 43.8772344] trap type 4 code 0 rip 0xffffffff81b70d2c cs 0x8 rflags 0x10202 cr2 0x7b4c7403eb90 ilevel 0 rsp 0xffffd7819d8b7780
[ 43.8772344] curlwp 0xffffd780134779c0 pid 1075.1075 lowest kstack 0xffffd7819d8b02c0

kernel: protection fault trap, code=0

Stopped in pid 1075.1075 (syz-executor2530) at netbsd:__asan_load4+0x62: movzbl 0(%rax),%r8d

?
__asan_load4() at netbsd:__asan_load4+0x62 kasan_shadow_1byte_isvalid sys/kern/subr_asan.c:310 [inline]
__asan_load4() at netbsd:__asan_load4+0x62 kasan_shadow_2byte_isvalid sys/kern/subr_asan.c:323 [inline]
__asan_load4() at netbsd:__asan_load4+0x62 kasan_shadow_4byte_isvalid sys/kern/subr_asan.c:343 [inline]
__asan_load4() at netbsd:__asan_load4+0x62 kasan_shadow_check sys/kern/subr_asan.c:417 [inline]
__asan_load4() at netbsd:__asan_load4+0x62 sys/kern/subr_asan.c:1206
ppptioctl() at netbsd:ppptioctl+0x434 ppprcvframe sys/net/ppp_tty.c:506 [inline]
ppptioctl() at netbsd:ppptioctl+0x434 sys/net/ppp_tty.c:442
comioctl() at netbsd:comioctl+0xed sys/dev/ic/com.c:1301
cdev_ioctl() at netbsd:cdev_ioctl+0x1e7 sys/kern/subr_devsw.c:1223
spec_ioctl() at netbsd:spec_ioctl+0x148 sys/miscfs/specfs/spec_vnops.c:1294
VOP_IOCTL() at netbsd:VOP_IOCTL+0x132 sys/kern/vnode_if.c:934
vn_ioctl() at netbsd:vn_ioctl+0x1b9 sys/kern/vfs_vnops.c:865
sys_ioctl() at netbsd:sys_ioctl+0x8f5 sys/kern/sys_generic.c:673

sys_syscall() at netbsd:sys_syscall+0x10e sy_call sys/sys/syscallvar.h:65 [inline]
sys_syscall() at netbsd:sys_syscall+0x10e sys/kern/sys_syscall.c:90

syscall() at netbsd:syscall+0x25a sy_call sys/sys/syscallvar.h:65 [inline]
syscall() at netbsd:syscall+0x25a sy_invoke sys/sys/syscallvar.h:94 [inline]
syscall() at netbsd:syscall+0x25a sys/arch/x86/x86/syscall.c:138

--- syscall (number 0) ---

netbsd:syscall+0x25a:
Panic string: (null)
PID LID S CPU FLAGS STRUCT LWP * NAME WAIT

1255 1255 2 0 0 ffffd78013cf0640 syz-executor2530
1105 1105 2 0 0 ffffd78013cf0200 syz-executor2530
1130 1130 2 0 0 ffffd78013cd5a40 syz-executor2530
1086 1086 2 0 0 ffffd78013cd5600 syz-executor2530
1222 1222 2 0 0 ffffd78013cd51c0 syz-executor2530
1223 1223 3 1 180 ffffd780133cab00 syz-executor2530 nanoslp
972 972 3 0 180 ffffd780133ca6c0 syz-executor2530 nanoslp
422 > 422 7 0 0 ffffd780133ca280 syz-executor2530
1075 >1075 7 1 0 ffffd780134779c0 syz-executor2530
1224 1224 2 1 140 ffffd78013477580 syz-executor2530
1082 1082 3 0 180 ffffd780126c9b80 syz-executor2530 nanoslp
1221 1221 3 1 180 ffffd780126c9300 syz-executor2530 nanoslp
1220 1220 3 0 180 ffffd78012b480c0 syz-executor2530 nanoslp
1054 1054 3 1 40180 ffffd78012b48500 sshd select
1076 1076 3 0 180 ffffd78013c325c0 getty nanoslp
1069 1069 3 1 180 ffffd780133b8ac0 getty nanoslp
1001 1001 3 1 180 ffffd780133b8240 getty nanoslp
1107 1107 3 0 1c0 ffffd78013340100 getty ttyraw
1067 1067 3 1 180 ffffd78013393a40 sshd select
949 949 3 0 180 ffffd78012d45340 powerd kqueue
688 688 3 1 180 ffffd7801340f700 syslogd kqueue
547 547 3 1 180 ffffd78012c1d700 dhcpcd poll
464 464 3 0 180 ffffd78012c82900 dhcpcd poll
616 616 3 1 180 ffffd78012c4fb80 dhcpcd poll
589 589 3 1 180 ffffd78012c4f300 dhcpcd poll
289 289 3 0 180 ffffd78012d84080 dhcpcd poll
288 288 3 0 180 ffffd78012d6e8c0 dhcpcd poll
351 351 3 0 180 ffffd78012d6e480 dhcpcd poll
1 1 3 0 180 ffffd780126fc9c0 init wait
0 971 3 0 200 ffffd78012974ac0 physiod physiod
0 194 3 0 200 ffffd7801298ab00 pooldrain pooldrain
0 193 3 0 200 ffffd7801298a6c0 ioflush syncer
0 192 3 1 200 ffffd7801298a280 pgdaemon pgdaemon
0 169 3 1 200 ffffd78012974240 usb7 usbevt
0 167 3 1 200 ffffd7801292ea80 usb6 usbevt
0 165 3 1 200 ffffd7801292e640 usb5 usbevt
0 164 3 1 200 ffffd7801292e200 usb4 usbevt
0 31 3 1 200 ffffd780128e0a40 usb3 usbevt
0 63 3 1 200 ffffd780128e0600 usb2 usbevt
0 126 3 1 200 ffffd780128e01c0 usb1 usbevt
0 125 3 0 200 ffffd78012869a00 usb0 usbevt
0 124 3 1 200 ffffd780128695c0 usbtask-dr usbtsk
0 123 3 1 200 ffffd780120b66c0 usbtask-hc usbtsk
0 122 3 0 200 ffffd78012869180 npfgc0 npfgcw
0 121 3 1 200 ffffd780126fc580 rt_free rt_free
0 120 3 1 200 ffffd780126fc140 unpgc unpgc
0 119 3 0 200 ffffd780126f6980 key_timehandler key_timehandler
0 118 3 1 200 ffffd780126f6540 icmp6_wqinput/1 icmp6_wqinput
0 117 3 0 200 ffffd780126f6100 icmp6_wqinput/0 icmp6_wqinput
0 116 3 0 200 ffffd780126ec940 nd6_timer nd6_timer
0 115 3 1 200 ffffd780126ec500 carp6_wqinput/1 carp6_wqinput
0 114 3 0 200 ffffd780126ec0c0 carp6_wqinput/0 carp6_wqinput
0 113 3 1 200 ffffd780126dd900 carp_wqinput/1 carp_wqinput
0 112 3 0 200 ffffd780126dd4c0 carp_wqinput/0 carp_wqinput
0 111 3 1 200 ffffd780126dd080 icmp_wqinput/1 icmp_wqinput
0 110 3 0 200 ffffd780126cc8c0 icmp_wqinput/0 icmp_wqinput
0 109 3 0 200 ffffd780126cbbc0 rt_timer rt_timer
0 108 3 0 200 ffffd780126cc480 vmem_rehash vmem_rehash
0 99 3 0 200 ffffd780120bbb40 entbutler entropy
0 98 3 1 200 ffffd780120bb700 viomb balloon
0 97 3 1 200 ffffd780120bb2c0 vioif0_txrx/1 vioif0_txrx
0 96 3 0 200 ffffd780120b6b00 vioif0_txrx/0 vioif0_txrx
0 29 3 0 200 ffffd780120b6280 scsibus0 sccomp
0 28 3 0 200 ffffd78010cbaac0 pms0 pmsreset
0 27 3 1 200 ffffd78010cba680 xcall/1 xcall
0 26 1 1 200 ffffd78010cba240 softser/1
0 25 1 1 200 ffffd78010cb9a80 softclk/1
0 24 1 1 200 ffffd78010cb9640 softbio/1
0 23 1 1 200 ffffd78010cb9200 softnet/1
0 22 1 1 201 ffffd7800fb55a40 idle/1
0 21 3 0 200 ffffd7800fb55600 lnxsyswq lnxsyswq
0 20 3 0 200 ffffd7800fb551c0 lnxubdwq lnxubdwq
0 19 3 0 200 ffffd7800fb54a00 lnxpwrwq lnxpwrwq
0 18 3 0 200 ffffd7800fb545c0 lnxlngwq lnxlngwq
0 17 3 0 200 ffffd7800fb54180 lnxhipwq lnxhipwq
0 16 3 0 200 ffffd7800fb4b9c0 lnxrcugc lnxrcugc
0 15 3 0 200 ffffd7800fb4b580 sysmon smtaskq
0 14 3 0 200 ffffd7800fb4b140 pmfsuspend pmfsuspend
0 13 3 0 200 ffffd7800fb47980 pmfevent pmfevent
0 12 3 0 200 ffffd7800fb47540 sopendfree sopendfr
0 11 3 1 200 ffffd7800fb47100 iflnkst iflnkst
0 10 3 0 200 ffffd7800fb3c940 nfssilly nfssilly
0 9 3 0 200 ffffd7800fb3c500 vdrain vdrain
0 8 3 1 200 ffffd7800fb3c0c0 modunload mod_unld
0 7 3 0 200 ffffd7800fb33900 xcall/0 xcall
0 6 1 0 200 ffffd7800fb334c0 softser/0
0 5 1 0 200 ffffd7800fb33080 softclk/0
0 4 1 0 200 ffffd7800fb318c0 softbio/0
0 3 1 0 200 ffffd7800fb31480 softnet/0
0 2 1 0 201 ffffd7800fb31040 idle/0
0 0 3 1 200 ffffffff8333d1c0 swapper uvm
[Locks tracked through LWPs]

****** LWP 1105.1105 (syz-executor2530) @ 0xffffd78013cf0200, l_stat=2

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at uvmspace_alloc)
lock address : 0xffffd78013ce8210 type : sleep/adaptive
initialized : 0xffffffff81a64ad7

shared holds : 0 exclusive: 0

shares wanted: 1 exclusive: 0

relevant cpu : 0 last held: 0

relevant lwp : 0xffffd78013cf0200 last held: 000000000000000000

last locked : 000000000000000000 unlocked*: 000000000000000000

owner/count : 0x0000000000000020 flags : 000000000000000000

Turnstile: no active turnstile for this lock.

****** LWP 1130.1130 (syz-executor2530) @ 0xffffd78013cd5a40, l_stat=2

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at uvm_obj_init)
lock address : 0xffffd78012953a40 type : sleep/adaptive
initialized : 0xffffffff81a7059a
shared holds : 1 exclusive: 0
shares wanted: 1 exclusive: 0

relevant cpu : 0 last held: 0

relevant lwp : 0xffffd78013cd5a40 last held: 0xffffd78013cd51c0
last locked : 0xffffffff81a4fa42 unlocked*: 0xffffffff81a4c7ca
owner/count : 0x0000000000000020 flags : 000000000000000000

Turnstile: no active turnstile for this lock.

****** LWP 1086.1086 (syz-executor2530) @ 0xffffd78013cd5600, l_stat=2

*** Locks held:

* Lock 0 (initialized at pmap_ctor)
lock address : 0xffffd78013cd1380 type : sleep/adaptive
initialized : 0xffffffff80944139

shared holds : 0 exclusive: 1
shares wanted: 0 exclusive: 0

relevant cpu : 0 last held: 0

relevant lwp : 0xffffd78013cd5600 last held: 0xffffd78013cd5600
last locked* : 0xffffffff80945f6c unlocked : 0xffffffff80944001
owner field : 0xffffd78013cd5600 wait/spin: 0/0

Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 1222.1222 (syz-executor2530) @ 0xffffd78013cd51c0, l_stat=2

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at pmap_ctor)
lock address : 0xffffd78013cd1180 type : sleep/adaptive
initialized : 0xffffffff80944139

shared holds : 0 exclusive: 0

shares wanted: 0 exclusive: 1

relevant cpu : 0 last held: 0

relevant lwp : 0xffffd78013cd51c0 last held: 000000000000000000

last locked : 000000000000000000 unlocked*: 000000000000000000

owner field : 0xffffd78013cd51c0 wait/spin: 0/0

Turnstile: no active turnstile for this lock.

****** LWP 1075.1075 (syz-executor2530) @ 0xffffd780134779c0, l_stat=7

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff834709c0 type : sleep/adaptive
initialized : 0xffffffff81afdd91
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 1 last held: 0

relevant lwp : 0xffffd780134779c0 last held: 000000000000000000