UBSan: Undefined Behavior in VFS_ROOT

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syzbot

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Sep 25, 2020, 7:30:19 AM9/25/20

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Hello,

syzbot found the following issue on:

HEAD commit: 80425266 Add a function to copy AC-Name and Service-Name
git tree: netbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=14fa79c3900000
kernel config: https://syzkaller.appspot.com/x/.config?x=1420f906d33d9f1f
dashboard link: https://syzkaller.appspot.com/bug?extid=fa2be6b3f3dcb1cb4ee0
compiler: g++ (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=168f46c5900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fa2be6...@syzkaller.appspotmail.com

[ 104.2191129] panic: UBSan: Undefined Behavior in /syzkaller/managers/netbsd-kubsan/kernel/sys/kern/vfs_subr.c:1382:9, member access within null pointer of type 'struct mount'

[ 104.2530455] cpu0: Begin traceback...
[ 104.2990912] vpanic() at netbsd:vpanic+0x2cd sys/kern/subr_prf.c:290
[ 104.4190856] isAlreadyReported() at netbsd:isAlreadyReported
[ 104.5390811] HandleTypeMismatch.part.0() at netbsd:HandleTypeMismatch.part.0+0x14d
[ 104.6590823] HandleTypeMismatch() at netbsd:HandleTypeMismatch+0x61 sys/../common/lib/libc/misc/ubsan.c:417
[ 104.7790839] VFS_ROOT() at netbsd:VFS_ROOT+0x125 sys/kern/vfs_subr.c:1382
[ 104.8990814] mount_domount() at netbsd:mount_domount+0x55a mount_checkdirs sys/kern/vfs_mount.c:656 [inline]
[ 104.8990814] mount_domount() at netbsd:mount_domount+0x55a sys/kern/vfs_mount.c:816
[ 105.0090830] do_sys_mount() at netbsd:do_sys_mount+0x56c sys/kern/vfs_syscalls.c:552
[ 105.1290813] sys___mount50() at netbsd:sys___mount50+0x5d sys/kern/vfs_syscalls.c:473
[ 105.2490833] sys___syscall() at netbsd:sys___syscall+0x1cf sy_call sys/sys/syscallvar.h:66 [inline]
[ 105.2490833] sys___syscall() at netbsd:sys___syscall+0x1cf sys/kern/sys_syscall.c:77
[ 105.3690811] syscall() at netbsd:syscall+0x2d5 sy_call sys/sys/syscallvar.h:65 [inline]
[ 105.3690811] syscall() at netbsd:syscall+0x2d5 sy_invoke sys/sys/syscallvar.h:94 [inline]
[ 105.3690811] syscall() at netbsd:syscall+0x2d5 sys/arch/x86/x86/syscall.c:138
[ 105.4001120] --- syscall (number 198) ---
[ 105.4290818] netbsd:syscall+0x2d5:
[ 105.4439272] cpu0: End traceback...
[ 105.4523723] fatal breakpoint trap in supervisor mode
[ 105.4624015] trap type 1 code 0 rip 0xffffffff80221a85 cs 0x8 rflags 0x246 cr2 0x63d059 ilevel 0 rsp 0xffff9800bf41b750
[ 105.4840417] curlwp 0xffff9556795f3a00 pid 1723.1860 lowest kstack 0xffff9800bf4172c0
Stopped in pid 1723.1860 (syz-executor.5) at netbsd:breakpoint+0x5: leave
?
breakpoint() at netbsd:breakpoint+0x5
db_panic() at netbsd:db_panic+0xec sys/ddb/db_panic.c:67
vpanic() at netbsd:vpanic+0x2cd sys/kern/subr_prf.c:290
isAlreadyReported() at netbsd:isAlreadyReported
HandleTypeMismatch.part.0() at netbsd:HandleTypeMismatch.part.0+0x14d
HandleTypeMismatch() at netbsd:HandleTypeMismatch+0x61 sys/../common/lib/libc/misc/ubsan.c:417
VFS_ROOT() at netbsd:VFS_ROOT+0x125 sys/kern/vfs_subr.c:1382
mount_domount() at netbsd:mount_domount+0x55a mount_checkdirs sys/kern/vfs_mount.c:656 [inline]
mount_domount() at netbsd:mount_domount+0x55a sys/kern/vfs_mount.c:816
do_sys_mount() at netbsd:do_sys_mount+0x56c sys/kern/vfs_syscalls.c:552
sys___mount50() at netbsd:sys___mount50+0x5d sys/kern/vfs_syscalls.c:473
sys___syscall() at netbsd:sys___syscall+0x1cf sy_call sys/sys/syscallvar.h:66 [inline]
sys___syscall() at netbsd:sys___syscall+0x1cf sys/kern/sys_syscall.c:77
syscall() at netbsd:syscall+0x2d5 sy_call sys/sys/syscallvar.h:65 [inline]
syscall() at netbsd:syscall+0x2d5 sy_invoke sys/sys/syscallvar.h:94 [inline]
syscall() at netbsd:syscall+0x2d5 sys/arch/x86/x86/syscall.c:138
--- syscall (number 198) ---
netbsd:syscall+0x2d5:
Panic string: UBSan: Undefined Behavior in /syzkaller/managers/netbsd-kubsan/kernel/sys/kern/vfs_subr.c:1382:9, member access within null pointer of type 'struct mount'

PID LID S CPU FLAGS STRUCT LWP * NAME WAIT
1723 >1860 7 0 100000 ffff9556795f3a00 syz-executor.5
1723 1723 3 1 10000000 ffff955679355600 syz-executor.5 lwpwait
1746 >1746 7 1 40 ffff955676300a80 syz-executor.5
1074 1076 2 0 0 ffff955676aaf300 syz-execprog
1074 1101 3 1 80 ffff955676aaf740 syz-execprog parked
1074 1084 3 1 80 ffff955677665040 syz-execprog parked
1074 1081 3 1 80 ffff95567641c540 syz-execprog kqueue
1074 418 3 1 80 ffff9556774ae780 syz-execprog parked
1074 1096 3 0 80 ffff955677665480 syz-execprog parked
1074 1082 3 0 80 ffff9556786e40c0 syz-execprog parked
1074 1075 3 1 c0 ffff955677fd0900 syz-execprog parked
1074 1069 3 0 80 ffff9556760455c0 syz-execprog parked
1074 1071 3 1 c0 ffff955676300640 syz-execprog parked
1074 924 2 0 40 ffff955676793b00 syz-execprog
1074 1074 3 0 80 ffff955676537240 syz-execprog parked
1068 1068 3 1 80 ffff955676aafb80 sshd select
937 937 3 0 80 ffff95567641c100 getty nanoslp
1119 1119 3 0 80 ffff9556786e4940 getty nanoslp
1089 1089 3 1 80 ffff9556786e4500 getty nanoslp
1099 1099 3 1 c0 ffff955676300200 getty ttyraw
951 951 3 0 80 ffff9556776658c0 sshd select
980 980 3 1 80 ffff9556774aebc0 powerd kqueue
869 869 3 0 80 ffff955676537680 syslogd kqueue
597 597 3 1 80 ffff955677fd0080 dhcpcd poll
593 593 3 1 80 ffff9556767936c0 dhcpcd poll
591 591 3 0 80 ffff955676537ac0 dhcpcd poll
427 427 3 1 80 ffff9556774ae340 dhcpcd poll
348 348 3 0 80 ffff9556766c9b40 dhcpcd poll
347 347 3 0 80 ffff955676793280 dhcpcd poll
346 346 3 0 80 ffff9556766c92c0 dhcpcd poll
1 1 3 1 80 ffff95566ded44c0 init wait
0 848 3 0 200 ffff955676045a00 physiod physiod
0 165 3 0 200 ffff9556760d7a40 pooldrain pooldrain
0 164 2 0 240 ffff9556760d7600 ioflush
0 163 3 1 200 ffff9556760d71c0 pgdaemon pgdaemon
0 160 3 0 200 ffff955676045180 usb7 usbevt
0 31 3 1 200 ffff9556730009c0 usb6 usbevt
0 63 3 0 200 ffff955673000580 usb5 usbevt
0 126 3 0 200 ffff955673000140 usb4 usbevt
0 125 3 0 200 ffff95566ff7b980 usb3 usbevt
0 124 3 0 200 ffff95566ff7b540 usb2 usbevt
0 123 3 0 200 ffff95566ff7b100 usb1 usbevt
0 122 3 1 200 ffff95566eefe940 usb0 usbevt
0 121 3 1 200 ffff95566eefe500 usbtask-dr usbtsk
0 120 3 1 200 ffff95566eefe0c0 usbtask-hc usbtsk
0 119 3 1 200 ffff95566ded4900 npfgc0 npfgcw
0 118 3 1 200 ffff95566ded4080 rt_free rt_free
0 117 3 1 200 ffff95566de878c0 unpgc unpgc
0 116 2 0 200 ffff95566de87480 key_timehandler
0 115 3 1 200 ffff95566de87040 icmp6_wqinput/1 icmp6_wqinput
0 114 3 0 200 ffff95566de82bc0 icmp6_wqinput/0 icmp6_wqinput
0 113 2 0 200 ffff95566de82780 nd6_timer
0 112 3 1 200 ffff95566de82340 carp6_wqinput/1 carp6_wqinput
0 111 3 0 200 ffff95566de29b80 carp6_wqinput/0 carp6_wqinput
0 110 3 1 200 ffff95566de29740 carp_wqinput/1 carp_wqinput
0 109 3 0 200 ffff95566de29300 carp_wqinput/0 carp_wqinput
0 108 3 1 200 ffff95566d780b00 icmp_wqinput/1 icmp_wqinput
0 107 3 0 200 ffff95566de002c0 icmp_wqinput/0 icmp_wqinput
0 106 2 0 200 ffff95566b33aac0 rt_timer
0 105 3 0 200 ffff95566de00700 vmem_rehash vmem_rehash
0 104 3 0 200 ffff95566de00b40 entbutler entropy
0 30 3 1 200 ffff95566d7806c0 vioif0_txrx/1 vioif0_txrx
0 29 3 0 200 ffff95566d780280 vioif0_txrx/0 vioif0_txrx
0 27 3 1 200 ffff95566b33a680 scsibus0 sccomp
0 26 3 0 200 ffff95566b33a240 pms0 pmsreset
0 25 3 1 200 ffff95566b27ca80 xcall/1 xcall
0 24 1 1 200 ffff95566b27c640 softser/1
0 23 1 1 200 ffff95566b27c200 softclk/1
0 22 1 1 200 ffff95566b247a40 softbio/1
0 21 1 1 200 ffff95566b247600 softnet/1
0 20 1 1 201 ffff95566b2471c0 idle/1
0 19 3 1 200 ffff95577b18ba00 lnxpwrwq lnxpwrwq
0 18 3 1 200 ffff95577b18b5c0 lnxlngwq lnxlngwq
0 17 3 1 200 ffff95577b18b180 lnxsyswq lnxsyswq
0 16 3 1 200 ffff95577b1a49c0 lnxrcugc lnxrcugc
0 15 3 0 200 ffff95577b1a4580 sysmon smtaskq
0 14 3 1 200 ffff95577b1a4140 pmfsuspend pmfsuspend
0 13 3 0 200 ffff95577b1b5980 pmfevent pmfevent
0 12 3 1 200 ffff95577b1b5540 sopendfree sopendfr
0 11 3 0 200 ffff95577b1b5100 iflnkst iflnkst
0 10 3 1 200 ffff95577c1de940 nfssilly nfssilly
0 9 3 0 200 ffff95577c1de500 vdrain vdrain
0 8 3 1 200 ffff95577c1de0c0 modunload mod_unld
0 7 3 0 200 ffff95577c215900 xcall/0 xcall
0 6 1 0 200 ffff95577c2154c0 softser/0
0 5 1 0 200 ffff95577c215080 softclk/0
0 4 1 0 200 ffff95577c23f8c0 softbio/0
0 3 1 0 200 ffff95577c23f480 softnet/0
0 2 1 0 201 ffff95577c23f040 idle/0
0 0 2 0 240 ffffffff85ed8640 swapper
[Locks tracked through LWPs]

****** LWP 1723.1860 (syz-executor.5) @ 0xffff9556795f3a00, l_stat=7

*** Locks held:

* Lock 0 (initialized at vfs_mountalloc)
lock address : 0xffff955679ca2800 type : sleep/adaptive
initialized : 0xffffffff834f319b
shared holds : 0 exclusive: 1
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffff9556795f3a00 last held: 0xffff9556795f3a00
last locked* : 0xffffffff834f9b19 unlocked : 000000000000000000
owner field : 0xffff9556795f3a00 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 593.593 (dhcpcd) @ 0xffff9556767936c0, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff862d18c0 type : sleep/adaptive
initialized : 0xffffffff83268577
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 1 last held: 0
relevant lwp : 0xffff9556767936c0 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 591.591 (dhcpcd) @ 0xffff955676537ac0, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff862d18c0 type : sleep/adaptive
initialized : 0xffffffff83268577
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffff955676537ac0 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 347.347 (dhcpcd) @ 0xffff955676793280, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff862d18c0 type : sleep/adaptive
initialized : 0xffffffff83268577
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffff955676793280 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 346.346 (dhcpcd) @ 0xffff9556766c92c0, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff862d18c0 type : sleep/adaptive
initialized : 0xffffffff83268577
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffff9556766c92c0 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) @ 0xffff95577b1b5100, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff862d18c0 type : sleep/adaptive
initialized : 0xffffffff83268577
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffff95577b1b5100 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) @ 0xffff95577c215080, l_stat=1

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff862d18c0 type : sleep/adaptive
initialized : 0xffffffff83268577
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffff95577c215080 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]

PAGE FLAG PQ UOBJECT UANON
0xffff980000007180 0045 00000000 0x0 0x0
0xffff980000007200 0045 00000000 0x0 0x0
0xffff980000007280 0045 00000000 0x0 0x0
0xffff980000007300 0045 00000000 0x0 0x0
0xffff980000007380 0045 00000000 0x0 0x0
0xffff980000007400 0045 00000000 0x0 0x0
0xffff980000007480 0045 00000000 0x0 0x0
0xffff980000007500 0045 00000000 0x0 0x0
0xffff980000007580 0041 00000000 0x0 0x0
0xffff980000007600 0041 00000000 0x0 0x0
0xffff980000007680 0041 00000000 0x0 0x0
0xffff980000007700 0041 00000000 0x0 0x0
0xffff980000007780 0045 00000000 0x0 0x0
0xffff980000007800 0045 00000000 0x0 0x0
0xffff980000007880 0045 00000000 0x0 0x0
0xffff980000007900 0041 00000000 0x0 0x0
0xffff980000007980 0041 00000000 0x0 0x0
0xffff980000007a00 0041 00000000 0x0 0x0
0xffff980000007a80 0041 00000000 0x0 0x0
0xffff980000007b00 0041 00000000 0x0 0x0
0xffff980000007b80 0041 00000000 0x0 0x0
0xffff980000007c00 0041 00000000 0x0 0x0
0xffff980000007c80 0041 00000000 0x0 0x0
0xffff980000007d00 0041 00000000 0x0 0x0
0xffff980000007d80 0041 00000000 0x0 0x0
0xffff980000007e00 0041 00000000 0x0 0x0
0xffff980000007e80 0041 00000000 0x0 0x0
0xffff980000007f00 0041 00000000 0x0 0x0
0xffff980000007f80 0041 00000000 0x0 0x0
0xffff980000008000 0041 00000000 0x0 0x0
0xffff980000008080 0041 00000000 0x0 0x0
0xffff980000008100 0041 00000000 0x0 0x0
0xffff980000008180 0041 00000000 0x0 0x0
0xffff980000008200 0041 00000000 0x0 0x0
0xffff980000008280 0041 00000000 0x0 0x0
0xffff980000008300 0041 00000000 0x0 0x0
0xffff980000008380 0041 00000000 0x0 0x0
0xffff980000008400 0041 00000000 0x0 0x0
0xffff980000008480 0041 00000000 0x0 0x0
0xffff980000008500 0041 00000000 0x0 0x0
0xffff980000008580 0041 00000000 0x0 0x0
0xffff980000008600 0041 00000000 0x0 0x0
0xffff980000008680 0045 00000000 0x0 0x0
0xffff980000008700 0041 00000000 0x0 0x0
0xffff980000008780 0041 00000000 0x0 0x0
0xffff980000008800 0041 00000000 0x0 0x0
0xffff980000008880 0041 00000000 0x0 0x0
0xffff980000008900 0041 00000000 0x0 0x0
0xffff980000008980 0041 00000000 0x0 0x0
0xffff980000008a00 0041 00000000 0x0 0x0
0xffff980000008a80 0041 00000000 0x0 0x0
0xffff980000008b00 0045 00000000 0x0 0x0
0xffff980000008b80 0041 00000000 0x0 0x0
0xffff980000008c00 0041 00000000 0x0 0x0
0xffff980000008c80 0041 00000000 0x0 0x0
0xffff980000008d00 0041 00000000 0x0 0x0
0xffff980000008d80 0041 00000000 0x0 0x0
0xffff980000008e00 0041 00000000 0x0 0x0
0xffff980000008e80 0041 00000000 0x0 0x0
0xffff980000008f00 0041 00000000 0x0 0x0
0xffff980000008f80 0045 00000000 0x0 0x0
0xffff980000009000 0041 00000000 0x0 0x0
0xffff980000009080 0041 00000000 0x0 0x0
0xffff980000009100 0041 00000000 0x0 0x0
0xffff980000009180 0041 00000000 0x0 0x0
0xffff980000009200 0041 00000000 0x0 0x0
0xffff980000009280 0041 00000000 0x0 0x0
0xffff980000009300 0041 00000000 0x0 0x0
0xffff980000009380 0041 00000000 0x0 0x0
0xffff980000009400 0041 00000000 0x0 0x0
0xffff980000009480 0041 00000000 0x0 0x0
0xffff980000009500 0041 00000000 0x0 0x0
0xffff980000009580 0041 00000000 0x0 0x0
0xffff980000009600 0041 00000000 0x0 0x0
0xffff980000009680 0041 00000000 0x0 0x0
0xffff980000009700 0041 00000000 0x0 0x0
0xffff980000009780 0041 00000000 0x0 0x0
0xffff980000009800 0041 00000000 0x0 0x0
0xffff980000009880 0041 00000000 0x0 0x0
0xffff980000009900 0041 00000000 0x0 0x0
0xffff980000009980 0041 00000000 0x0 0x0
0xffff980000009a00 0041 00000000 0x0 0x0
0xffff980000009a80 0041 00000000 0x0 0x0
0xffff980000009b00 0041 00000000 0x0 0x0
0xffff980000009b80 0041 00000000 0x0 0x0
0xffff980000009c00 0041 00000000 0x0 0x0
0xffff980000009c80 0041 00000000 0x0 0x0
0xffff980000009d00 0041 00000000 0x0 0x0
0xffff980000009d80 0041 00000000 0x0 0x0
0xffff980000009e00 0041 00000000 0x0 0x0
0xffff980000009e80 0041 00000000 0x0 0x0
0xffff980000009f00 0041 00000000 0x0 0x0
0xffff980000009f80 0041 00000000 0x0 0x0
0xffff98000000a000 0041 00000000 0x0 0x0
0xffff98000000a080 0041 00000000 0x0 0x0
0xffff98000000a100 0045 00000000 0x0 0x0
0xffff98000000a180 0041 00000000 0x0 0x0
0xffff98000000a200 0041 00000000 0x0 0x0
0xffff98000000a280 0041 00000000 0x0 0x0
0xffff98000000a300 0041 00000000 0x0 0x0
0xffff98000000a380 0041 00000000 0x0 0x0
0xffff98000000a400 0041 00000000 0x0 0x0
0xffff98000000a480 0041 00000000 0x0 0x0
0xffff98000000a500 0041 00000000 0x0 0x0
0xffff98000000a580 0041 00000000 0x0 0x0
0xffff98000000a600 0045 00000000 0x0 0x0
0xffff98000000a680 0041 00000000 0x0 0x0
0xffff98000000a700 0041 00000000 0x0 0x0
0xffff98000000a780 0041 00000000 0x0 0x0
0xffff98000000a800 0041 00000000 0x0 0x0
0xffff98000000a880 0041 00000000 0x0 0x0
0xffff98000000a900 0041 00000000 0x0 0x0
0xffff98000000a980 0045 00000000 0x0 0x0
0xffff98000000aa00 0045 00000000 0x0 0x0
0xffff98000000aa80 0041 00000000 0x0 0x0
0xffff98000000ab00 0041 00000000 0x0 0x0
0xffff98000000ab80 0041 00000000 0x0 0x0
0xffff98000000ac00 0041 00000000 0x0 0x0
0xffff98000000ac80 0041 00000000 0x0 0x0
0xffff98000000ad00 0041 00000000 0x0 0x0
0xffff98000000ad80 0045 00000000 0x0 0x0
0xffff98000000ae00 0045 00000000 0x0 0x0
0xffff98000000ae80 0041 00000000 0x0 0x0
0xffff98000000af00 0041 00000000 0x0 0x0
0xffff98000000af80 0041 00000000 0x0 0x0
0xffff98000000b000 0041 00000000 0x0 0x0
0xffff98000000b080 0041 00000000 0x0 0x0
0xffff98000000b100 0041 00000000 0x0 0x0
0xffff98000000b180 0045 00000000 0x0 0x0
0xffff98000000b200 0045 00000000 0x0 0x0
0xffff98000000b280 0045 00000000 0x0 0x0
0xffff98000000b300 0041 00000000 0x0 0x0
0xffff98000000b380 0041 00000000 0x0 0x0
0xffff98000000b400 0041 00000000 0x0 0x0
0xffff98000000b480 0041 00000000 0x0 0x0
0xffff98000000b500 0045 00000000 0x0 0x0
0xffff98000000b580 0045 00000000 0x0 0x0
0xffff98000000b600 0045 00000000 0x0 0x0
0xffff98000000b680 0045 00000000 0x0 0x0
0xffff98000000b700 0041 00000000 0x0 0x0
0xffff98000000b780 0041 00000000 0x0 0x0
0xffff98000000b800 0045 00000000 0x0 0x0
0xffff98000000b880 0041 00000000 0x0 0x0
0xffff98000000b900 0045 00000000 0x0 0x0
0xffff98000000b980 0045 00000000 0x0 0x0
0xffff98000000ba00 0041 00000000 0x0 0x0
0xffff98000000ba80 0045 00000000 0x0 0x0
0xffff98000000bb00 0045 00000000 0x0 0x0
0xffff98000000bb80 0041 00000000 0x0 0x0
0xffff98000000bc00 0045 00000000 0x0 0x0
0xffff98000000bc80 0045 00000000 0x0 0x0
0xffff98000000bd00 0045 00000000 0x0 0x0
0xffff98000000bd80 0041 00000000 0x0 0x0
0xffff98000000be00 0041 00000000 0x0 0x0
0xffff98000000be80 0045 00000000 0x0 0x0
0xffff98000000bf00 0045 00000000 0x0 0x0
0xffff98000000bf80 0045 00000000 0x0 0x0
0xffff98000000c000 0045 00000000 0x0 0x0
0xffff98000000c080 0045 00000000 0x0 0x0
0xffff98000000c100 0045 00000000 0x0 0x0
0xffff98000000c180 0041 00000000 0x0 0x0
0xffff98000000c200 0041 00000000 0x0 0x0
0xffff98000000c280 0041 00000000 0x0 0x0
0xffff98000000c300 0045 00000000 0x0 0x0
0xffff98000000c380 0045 00000000 0x0 0x0
0xffff98000000c400 0045 00000000 0x0 0x0
0xffff98000000c480 0045 00000000 0x0 0x0
0xffff98000000c500 0045 00000000 0x0 0x0
0xffff98000000c580 0041 00000000 0x0 0x0
0xffff98000000c600 0041 00000000 0x0 0x0
0xffff98000000c680 0041 00000000 0x0 0x0
0xffff98000000c700 0045 00000000 0x0 0x0
0xffff98000000c780 0045 00000000 0x0 0x0
0xffff98000000c800 0045 00000000 0x0 0x0
0xffff98000000c880 0045 00000000 0x0 0x0
0xffff98000000c900 0041 00000000 0x0 0x0
0xffff98000000c980 0041 00000000 0x0 0x0
0xffff98000000ca00 0041 00000000 0x0 0x0
0xffff98000000ca80 0041 00000000 0x0 0x0
0xffff98000000cb00 0041 00000000 0x0 0x0
0xffff98000000cb80 0045 00000000 0x0 0x0
0xffff98000000cc00 0041 00000000 0x0 0x0
0xffff98000000cc80 0045 00000000 0x0 0x0
0xffff98000000cd00 0041 00000000 0x0 0x0
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0xffff98000001ba00 0001 00000000 0x0 0x0
0xffff98000001ba80 0001 00000000 0x0 0x0
0xffff98000001bb00 0001 00000000 0x0 0x0
0xffff98000001bb80 0001 00000000 0x0 0x0
0xffff98000001bc00 0001 00000000 0x0 0x0
0xffff98000001bc80 0001 00000000 0x0 0x0
0xffff98000001bd00 0001 00000000 0x0 0x0
0xffff98000001bd80 0001 00000000 0x0 0x0
0xffff98000001be00 0001 00000000 0x0 0x0
0xffff98000001be80 0001 00000000 0x0 0x0
0xffff98000001bf00 0001 00000000 0x0 0x0
0xffff98000001bf80 0001 00000000 0x0 0x0
0xffff98000001c000 0001 00000000 0x0 0x0
0xffff98000001c080 0001 00000000 0x0 0x0
0xffff98000001c100 0001 00000000 0x0 0x0
0xffff98000001c180 0001 00000000 0x0 0x0
0xffff98000001c200 0001 00000000 0x0 0x0
0xffff98000001c280 0001 00000000 0x0 0x0
0xffff98000001c300 0001 00000000 0x0 0x0
0xffff98000001c380 0001 00000000 0x0 0x0
0xffff98000001c400 0001 00000000 0x0 0x0
0xffff98000001c480 0001 00000000 0x0 0x0
0xffff98000001c500 0001 00000000 0x0 0x0
0xffff98000001c580 0001 00000000 0x0 0x0
0xffff98000001c600 0001 00000000 0x0 0x0
0xffff98000001c680 0001 00000000 0x0 0x0
0xffff98000001c700 0001 00000000 0x0 0x0
0xffff98000001c780 0001 00000000 0x0 0x0
0xffff98000001c800 0001 00000000 0x0 0x0
0xffff98000001c880 0001 00000000 0x0 0x0
0xffff98000001c900 0001 00000000 0x0 0x0
0xffff98000001c980 0001 00000000 0x0 0x0
0xffff98000001ca00 0001 00000000 0x0 0x0
0xffff98000001ca80 0001 00000000 0x0 0x0
0xffff98000001cb00 0001 00000000 0x0 0x0
0xffff98000001cb80 0001 00000000 0x0 0x0
0xffff98000001cc00 0001 00000000 0x0 0x0
0xffff98000001cc80 0001 00000000 0x0 0x0
0xffff98000001cd00 0001 00000000 0x0 0x0
0xffff98000001cd80 0001 00000000 0x0 0x0
0xffff98000001ce00 0001 00000000 0x0 0x0
0xffff98000001ce80 0001 00000000 0x0 0x0
0xffff98000001cf00 0001 00000000 0x0 0x0
0xffff98000001cf80 0001 00000000 0x0 0x0
0xffff98000001d000 0001 00000000 0x0 0x0
0xffff98000001d080 0001 00000000 0x0 0x0
0xffff98000001d100 0001 00000000 0x0 0x0
0xffff98000001d180 0001 00000000 0x0 0x0
0xffff98000001d200 0001 00000000 0x0 0x0
0xffff98000001d280 0001 00000000 0x0 0x0
0xffff98000001d300 0001 00000000 0x0 0x0
0xffff98000001d380 0001 00000000 0x0 0x0
0xffff98000001d400 0001 00000000 0x0 0x0
0xffff98000001d480 0001 00000000 0x0 0x0
0xffff98000001d500 0001 00000000 0x0 0x0
0xffff98000001d580 0001 00000000 0x0 0x0
0xffff98000001d600 0001 00000000 0x0 0x0
0xffff98000001d680 0001 00000000 0x0 0x0
0xffff98000001d700 0001 00000000 0x0 0x0
0xffff98000001d780 0001 00000000 0x0 0x0
0xffff98000001d800 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 can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

syzbot

unread,

Nov 17, 2020, 5:37:23 AM11/17/20

to syzkaller-...@googlegroups.com

syzbot has found a reproducer for the following issue on:

HEAD commit: e9cd26b7 Add new spin mutex to avoid race between ixgbe_ms..
git tree: netbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=114d08f2500000

kernel config: https://syzkaller.appspot.com/x/.config?x=1420f906d33d9f1f
dashboard link: https://syzkaller.appspot.com/bug?extid=fa2be6b3f3dcb1cb4ee0
compiler: g++ (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=117c4b81500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1245a486500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fa2be6...@syzkaller.appspotmail.com

[ 39.6134467] panic: UBSan: Undefined Behavior in /syzkaller/managers/netbsd-kubsan/kernel/sys/kern/vfs_subr.c:1382:9, member access within null pointer of type 'struct mount'

[ 39.6134467] cpu0: Begin traceback...
[ 39.6334323] vpanic() at netbsd:vpanic+0x2cd sys/kern/subr_prf.c:290
[ 39.6934331] isAlreadyReported() at netbsd:isAlreadyReported
[ 39.7534327] HandleTypeMismatch.part.0() at netbsd:HandleTypeMismatch.part.0+0x14d
[ 39.8134313] HandleTypeMismatch() at netbsd:HandleTypeMismatch+0x61 sys/../common/lib/libc/misc/ubsan.c:417
[ 39.8734339] VFS_ROOT() at netbsd:VFS_ROOT+0x126 sys/kern/vfs_subr.c:1382
[ 39.9334318] mount_domount() at netbsd:mount_domount+0x58d mount_checkdirs sys/kern/vfs_mount.c:656 [inline]
[ 39.9334318] mount_domount() at netbsd:mount_domount+0x58d sys/kern/vfs_mount.c:816
[ 39.9834318] do_sys_mount() at netbsd:do_sys_mount+0x56c sys/kern/vfs_syscalls.c:552
[ 40.0434327] sys___mount50() at netbsd:sys___mount50+0x5d sys/kern/vfs_syscalls.c:473
[ 40.1034316] sys_syscall() at netbsd:sys_syscall+0x1cf sy_call sys/sys/syscallvar.h:66 [inline]
[ 40.1034316] sys_syscall() at netbsd:sys_syscall+0x1cf sys/kern/sys_syscall.c:77
[ 40.1634342] syscall() at netbsd:syscall+0x2d5 sy_call sys/sys/syscallvar.h:65 [inline]
[ 40.1634342] syscall() at netbsd:syscall+0x2d5 sy_invoke sys/sys/syscallvar.h:94 [inline]
[ 40.1634342] syscall() at netbsd:syscall+0x2d5 sys/arch/x86/x86/syscall.c:138
[ 40.1734356] --- syscall (number 0) ---
[ 40.1934345] netbsd:syscall+0x2d5:
[ 40.1934345] cpu0: End traceback...
[ 40.2051025] fatal breakpoint trap in supervisor mode
[ 40.2051025] trap type 1 code 0 rip 0xffffffff80221a85 cs 0x8 rflags 0x246 cr2 0x74e89023ed30 ilevel 0 rsp 0xffffa080c82f4750
[ 40.2212320] curlwp 0xffff9bd5fc8dba00 pid 328.328 lowest kstack 0xffffa080c82f02c0
Stopped in pid 328.328 (syz-executor4675) at netbsd:breakpoint+0x5: leave

?
breakpoint() at netbsd:breakpoint+0x5
db_panic() at netbsd:db_panic+0xec sys/ddb/db_panic.c:67
vpanic() at netbsd:vpanic+0x2cd sys/kern/subr_prf.c:290
isAlreadyReported() at netbsd:isAlreadyReported
HandleTypeMismatch.part.0() at netbsd:HandleTypeMismatch.part.0+0x14d
HandleTypeMismatch() at netbsd:HandleTypeMismatch+0x61 sys/../common/lib/libc/misc/ubsan.c:417

VFS_ROOT() at netbsd:VFS_ROOT+0x126 sys/kern/vfs_subr.c:1382
mount_domount() at netbsd:mount_domount+0x58d mount_checkdirs sys/kern/vfs_mount.c:656 [inline]
mount_domount() at netbsd:mount_domount+0x58d sys/kern/vfs_mount.c:816

do_sys_mount() at netbsd:do_sys_mount+0x56c sys/kern/vfs_syscalls.c:552
sys___mount50() at netbsd:sys___mount50+0x5d sys/kern/vfs_syscalls.c:473

sys_syscall() at netbsd:sys_syscall+0x1cf sy_call sys/sys/syscallvar.h:66 [inline]
sys_syscall() at netbsd:sys_syscall+0x1cf sys/kern/sys_syscall.c:77

syscall() at netbsd:syscall+0x2d5 sy_call sys/sys/syscallvar.h:65 [inline]
syscall() at netbsd:syscall+0x2d5 sy_invoke sys/sys/syscallvar.h:94 [inline]
syscall() at netbsd:syscall+0x2d5 sys/arch/x86/x86/syscall.c:138

--- syscall (number 0) ---

netbsd:syscall+0x2d5:
Panic string: UBSan: Undefined Behavior in /syzkaller/managers/netbsd-kubsan/kernel/sys/kern/vfs_subr.c:1382:9, member access within null pointer of type 'struct mount'

PID LID S CPU FLAGS STRUCT LWP * NAME WAIT

1081 1081 2 0 0 ffff9bd5fc8db5c0 syz-executor4675
328 > 328 7 0 0 ffff9bd5fc8dba00 syz-executor4675
327 327 2 0 0 ffff9bd5fd6f0200 syz-executor4675
985 985 2 0 0 ffff9bd5fccb6a40 syz-executor4675
420 420 2 0 140 ffff9bd5fc857540 syz-executor4675
858 858 2 0 140 ffff9bd5fc857980 syz-executor4675
1098 1098 2 1 140 ffff9bd5fa9ebac0 syz-executor4675
1074 1074 2 0 140 ffff9bd5fac010c0 syz-executor4675
1072 1072 2 1 140 ffff9bd5fa9eb680 syz-executor4675
1119 >1119 7 1 140 ffff9bd5fa60c600 syz-executor4675
846 846 3 0 40180 ffff9bd5fa9eb240 syz-executor4675 nanoslp
1071 1071 3 1 180 ffff9bd5fa67fa80 sshd select
1090 1090 3 1 180 ffff9bd5fc8db180 getty nanoslp
952 952 3 1 180 ffff9bd5fab5e9c0 getty nanoslp
1101 1101 3 1 180 ffff9bd5fccb6600 getty nanoslp
1097 1097 3 1 1c0 ffff9bd5fccb61c0 getty ttyraw
948 948 3 0 180 ffff9bd5fab5e580 sshd select
982 982 3 1 180 ffff9bd5fab5e140 powerd kqueue
871 871 3 0 180 ffff9bd5facc06c0 syslogd kqueue
599 599 3 1 180 ffff9bd5fbb1b780 dhcpcd poll
595 595 3 0 180 ffff9bd5fad6e2c0 dhcpcd poll
593 593 3 1 180 ffff9bd5facc0280 dhcpcd poll
428 428 3 0 180 ffff9bd5fac92b80 dhcpcd poll
350 350 3 0 180 ffff9bd5fac92300 dhcpcd poll
349 349 3 1 180 ffff9bd5fad6eb40 dhcpcd poll
348 348 3 1 180 ffff9bd5f23922c0 dhcpcd poll
1 1 3 0 180 ffff9bd5f2458100 init wait
0 866 3 0 200 ffff9bd5fa60ca40 physiod physiod
0 192 2 0 240 ffff9bd5fa67f640 ioflush
0 166 3 0 200 ffff9bd5f2392700 pooldrain pooldrain
0 165 3 1 200 ffff9bd5fa67f200 pgdaemon pgdaemon
0 162 3 1 200 ffff9bd5fa60c1c0 usb7 usbevt
0 161 3 1 200 ffff9bd5f7577a00 usb6 usbevt
0 31 3 1 200 ffff9bd5f75775c0 usb5 usbevt
0 63 3 1 200 ffff9bd5f7577180 usb4 usbevt
0 126 3 1 200 ffff9bd5f45029c0 usb3 usbevt
0 125 3 1 200 ffff9bd5f4502580 usb2 usbevt
0 124 3 1 200 ffff9bd5f4502140 usb1 usbevt
0 123 3 1 200 ffff9bd5f2458980 usb0 usbevt
0 122 3 1 200 ffff9bd5f2392b40 usbtask-dr usbtsk
0 121 3 0 200 ffff9bd5ef8b3ac0 usbtask-hc usbtsk
0 120 3 0 200 ffff9bd5f2458540 npfgc0 npfgcw
0 119 3 1 200 ffff9bd5f245b940 rt_free rt_free
0 118 3 1 200 ffff9bd5f245b500 unpgc unpgc
0 117 3 0 200 ffff9bd5f245b0c0 key_timehandler key_timehandler
0 116 3 1 200 ffff9bd5f242e900 icmp6_wqinput/1 icmp6_wqinput
0 115 3 0 200 ffff9bd5f242e4c0 icmp6_wqinput/0 icmp6_wqinput
0 114 2 0 200 ffff9bd5f242e080 nd6_timer
0 113 3 1 200 ffff9bd5f24218c0 carp6_wqinput/1 carp6_wqinput
0 112 3 0 200 ffff9bd5f2421480 carp6_wqinput/0 carp6_wqinput
0 111 3 1 200 ffff9bd5f2421040 carp_wqinput/1 carp_wqinput
0 110 3 0 200 ffff9bd5f23fcbc0 carp_wqinput/0 carp_wqinput
0 109 3 1 200 ffff9bd5f23fc780 icmp_wqinput/1 icmp_wqinput
0 108 3 0 200 ffff9bd5f23fc340 icmp_wqinput/0 icmp_wqinput
0 107 3 0 200 ffff9bd5f2397b80 rt_timer rt_timer
0 106 3 1 200 ffff9bd5f2397740 vmem_rehash vmem_rehash
0 105 3 0 200 ffff9bd5f2397300 entbutler entropy
0 96 3 1 200 ffff9bd5f1d23b00 viomb balloon
0 30 3 1 200 ffff9bd5f1d236c0 vioif0_txrx/1 vioif0_txrx
0 29 2 0 200 ffff9bd5f1d23280 vioif0_txrx/0
0 27 3 0 200 ffff9bd5ef8b3680 scsibus0 sccomp
0 26 3 0 200 ffff9bd5ef8b3240 pms0 pmsreset
0 25 3 1 200 ffff9bd5ef804a80 xcall/1 xcall
0 24 1 1 200 ffff9bd5ef804640 softser/1
0 23 1 1 200 ffff9bd5ef804200 softclk/1
0 22 1 1 200 ffff9bd5ef7dfa40 softbio/1
0 21 1 1 200 ffff9bd5ef7df600 softnet/1
0 20 1 1 201 ffff9bd5ef7df1c0 idle/1
0 19 3 0 200 ffff9bd71e749a00 lnxpwrwq lnxpwrwq
0 18 3 0 200 ffff9bd71e7495c0 lnxlngwq lnxlngwq
0 17 3 0 200 ffff9bd71e749180 lnxsyswq lnxsyswq
0 16 3 0 200 ffff9bd71e7649c0 lnxrcugc lnxrcugc
0 15 3 0 200 ffff9bd71e764580 sysmon smtaskq
0 14 3 0 200 ffff9bd71e764140 pmfsuspend pmfsuspend
0 13 3 0 200 ffff9bd71e773980 pmfevent pmfevent
0 12 3 0 200 ffff9bd71e773540 sopendfree sopendfr
0 11 3 0 200 ffff9bd71e773100 iflnkst iflnkst
0 10 3 0 200 ffff9bd71f79e940 nfssilly nfssilly
0 9 3 0 200 ffff9bd71f79e500 vdrain vdrain
0 8 3 0 200 ffff9bd71f79e0c0 modunload mod_unld
0 7 3 0 200 ffff9bd71f7d3900 xcall/0 xcall
0 6 1 0 200 ffff9bd71f7d34c0 softser/0
0 5 1 0 200 ffff9bd71f7d3080 softclk/0
0 4 1 0 200 ffff9bd71f7fd8c0 softbio/0
0 3 1 0 200 ffff9bd71f7fd480 softnet/0
0 2 1 0 201 ffff9bd71f7fd040 idle/0
0 0 2 0 240 ffffffff85edbf80 swapper
[Locks tracked through LWPs]

****** LWP 1081.1081 (syz-executor4675) @ 0xffff9bd5fc8db5c0, l_stat=2

*** Locks held:

* Lock 0 (initialized at pmap_ctor)
lock address : 0xffff9bd5fab83580 type : sleep/adaptive
initialized : 0xffffffff80f505be

shared holds : 0 exclusive: 1
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0

relevant lwp : 0xffff9bd5fc8db5c0 last held: 0xffff9bd5fc8db5c0
last locked* : 0xffffffff80f52c6a unlocked : 0xffffffff80f502f6
owner field : 0xffff9bd5fc8db5c0 wait/spin: 0/0

Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 328.328 (syz-executor4675) @ 0xffff9bd5fc8dba00, l_stat=7

*** Locks held:

* Lock 0 (initialized at vfs_mountalloc)

lock address : 0xffff9bd5fd802d80 type : sleep/adaptive
initialized : 0xffffffff834e1dab

shared holds : 0 exclusive: 1
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0

relevant lwp : 0xffff9bd5fc8dba00 last held: 0xffff9bd5fc8dba00
last locked* : 0xffffffff834e8729 unlocked : 000000000000000000
owner field : 0xffff9bd5fc8dba00 wait/spin: 0/0

Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 595.595 (dhcpcd) @ 0xffff9bd5fad6e2c0, l_stat=3