UBSan: Undefined Behavior in nanosleep1

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syzbot

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Mar 11, 2022, 11:33:30 PM3/11/22

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Hello,

syzbot found the following issue on:

HEAD commit: eda29d51e6aa fix reversed test
git tree: netbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=11cba0ee700000
kernel config: https://syzkaller.appspot.com/x/.config?x=1420f906d33d9f1f
dashboard link: https://syzkaller.appspot.com/bug?extid=3bdd260582424a611946
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+3bdd26...@syzkaller.appspotmail.com

[ 61.7507116] panic: UBSan: Undefined Behavior in /syzkaller/managers/ci2-netbsd-kubsan/kernel/sys/kern/kern_time.c:439:4, signed integer overflow: 9223372036854775807 - -2 cannot be represented in type 'long int'

[ 61.7607009] cpu1: Begin traceback...
[ 61.8006892] vpanic() at netbsd:vpanic+0x2d0 sys/kern/subr_prf.c:290
[ 61.9006865] Report() at netbsd:Report+0x3b sys/../common/lib/libc/misc/ubsan.c:1352
[ 61.9806831] HandleOverflow() at netbsd:HandleOverflow+0x1d0 sys/../common/lib/libc/misc/ubsan.c:375
[ 62.0506844] nanosleep1() at netbsd:nanosleep1+0x926 sys/kern/kern_time.c:439
[ 62.1306833] sys_clock_nanosleep() at netbsd:sys_clock_nanosleep+0xcd sys/kern/kern_time.c:386
[ 62.2006827] sys___syscall() at netbsd:sys___syscall+0x1cf sy_call sys/sys/syscallvar.h:66 [inline]
[ 62.2006827] sys___syscall() at netbsd:sys___syscall+0x1cf sys/kern/sys_syscall.c:77
[ 62.2706844] syscall() at netbsd:syscall+0x2da sy_call sys/sys/syscallvar.h:65 [inline]
[ 62.2706844] syscall() at netbsd:syscall+0x2da sy_invoke sys/sys/syscallvar.h:94 [inline]
[ 62.2706844] syscall() at netbsd:syscall+0x2da sys/arch/x86/x86/syscall.c:138
[ 62.2906846] --- syscall (number 198) ---
[ 62.3106874] netbsd:syscall+0x2da:
[ 62.3206836] cpu1: End traceback...
[ 62.3206836] fatal breakpoint trap in supervisor mode
[ 62.3206836] trap type 1 code 0 rip 0xffffffff80221a95 cs 0x8 rflags 0x246 cr2 0x71e30c2983e0 ilevel 0 rsp 0xffff9a80d13037e0
[ 62.3406836] curlwp 0xffffc8d63aa62b40 pid 1471.2372 lowest kstack 0xffff9a80d12ff2c0
Stopped in pid 1471.2372 (syz-executor.3) at netbsd:breakpoint+0x5: leave
?
breakpoint() at netbsd:breakpoint+0x5
db_panic() at netbsd:db_panic+0xec sys/ddb/db_panic.c:69
vpanic() at netbsd:vpanic+0x2d0 sys/kern/subr_prf.c:290
Report() at netbsd:Report+0x3b sys/../common/lib/libc/misc/ubsan.c:1352
HandleOverflow() at netbsd:HandleOverflow+0x1d0 sys/../common/lib/libc/misc/ubsan.c:375
nanosleep1() at netbsd:nanosleep1+0x926 sys/kern/kern_time.c:439
sys_clock_nanosleep() at netbsd:sys_clock_nanosleep+0xcd sys/kern/kern_time.c:386
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+0x2da sy_call sys/sys/syscallvar.h:65 [inline]
syscall() at netbsd:syscall+0x2da sy_invoke sys/sys/syscallvar.h:94 [inline]
syscall() at netbsd:syscall+0x2da sys/arch/x86/x86/syscall.c:138
--- syscall (number 198) ---
netbsd:syscall+0x2da:
Panic string: UBSan: Undefined Behavior in /syzkaller/managers/ci2-netbsd-kubsan/kernel/sys/kern/kern_time.c:439:4, signed integer overflow: 9223372036854775807 - -2 cannot be represented in type 'long int'

PID LID S CPU FLAGS STRUCT LWP * NAME WAIT
2485 2343 3 1 180 ffffc8d63cb25080 syz-executor.4 nanoslp
2485 2485 2 0 10000140 ffffc8d63aa62700 syz-executor.4
2338 1609 3 1 180 ffffc8d63d321180 syz-executor.1 parked
2338 2501 3 1 180 ffffc8d63cdd7540 syz-executor.1 nanoslp
2338 2338 2 0 10000140 ffffc8d63c64eb80 syz-executor.1
1471 >2372 7 1 100100 ffffc8d63aa62b40 syz-executor.3
1471 1471 2 0 10000040 ffffc8d63b75a940 syz-executor.3
843 843 2 0 140 ffffc8d631d47180 syz-executor.3
1000 1000 3 0 1c0 ffffc8d631d475c0 syz-executor.2 pipe_rd
942 942 2 0 140 ffffc8d63282fb00 syz-executor.4
1129 1129 3 0 1c0 ffffc8d631d47a00 syz-executor.5 pipe_rd
1222 1222 3 0 1c0 ffffc8d63282f6c0 syz-executor.0 pipe_rd
973 973 2 0 140 ffffc8d631c461c0 syz-executor.1
1194 424 3 0 180 ffffc8d6311af500 syz-fuzzer parked
1194 1080 3 1 180 ffffc8d631c46a40 syz-fuzzer parked
1194 1077 2 1 140 ffffc8d63108a200 syz-fuzzer
1194 1191 3 0 180 ffffc8d63282f280 syz-fuzzer parked
1194 1220 3 0 180 ffffc8d6303b0b00 syz-fuzzer parked
1194 1084 3 1 180 ffffc8d6303b0280 syz-fuzzer parked
1194 1054 3 0 180 ffffc8d63000f240 syz-fuzzer parked
1194 1193 2 1 140 ffffc8d63108a640 syz-fuzzer
1194 1194 3 1 180 ffffc8d6322fcac0 syz-fuzzer parked
1111 1111 3 0 180 ffffc8d63108aa80 sshd select
1127 1127 3 0 180 ffffc8d6322fc680 getty nanoslp
941 941 3 1 180 ffffc8d6322fc240 getty nanoslp
1067 1067 3 1 180 ffffc8d63000f680 getty nanoslp
1258 1258 3 1 1c0 ffffc8d62fdea600 getty ttyraw
1093 1093 3 1 180 ffffc8d631c46600 sshd select
946 946 3 1 180 ffffc8d63168f540 powerd kqueue
687 687 3 0 180 ffffc8d6311af940 syslogd kqueue
600 600 3 0 180 ffffc8d6308fc780 dhcpcd poll
602 602 3 0 180 ffffc8d6305d6740 dhcpcd poll
739 739 3 0 180 ffffc8d6311af0c0 dhcpcd poll
588 588 3 1 180 ffffc8d63050d700 dhcpcd poll
289 289 3 0 180 ffffc8d6305d6b80 dhcpcd poll
288 288 3 0 180 ffffc8d63050d2c0 dhcpcd poll
351 351 3 0 180 ffffc8d6305d6300 dhcpcd poll
1 1 3 0 180 ffffc8d627bfe980 init wait
0 967 3 0 200 ffffc8d62fdeaa40 physiod physiod
0 194 3 0 200 ffffc8d62fe9da80 pooldrain pooldrain
0 > 193 7 0 240 ffffc8d62fe9d640 ioflush
0 192 3 1 200 ffffc8d62fe9d200 pgdaemon pgdaemon
0 166 3 1 200 ffffc8d62fdea1c0 usb7 usbevt
0 165 3 1 200 ffffc8d62cdada00 usb6 usbevt
0 164 3 1 200 ffffc8d62cdad5c0 usb5 usbevt
0 163 3 1 200 ffffc8d62cdad180 usb4 usbevt
0 31 3 1 200 ffffc8d627c889c0 usb3 usbevt
0 63 3 1 200 ffffc8d627c88580 usb2 usbevt
0 126 3 1 200 ffffc8d62756ab40 usb1 usbevt
0 125 3 1 200 ffffc8d627bdd300 usb0 usbevt
0 124 3 1 200 ffffc8d627bdd740 usbtask-dr usbtsk
0 123 3 0 200 ffffc8d62753d6c0 usbtask-hc usbtsk
0 122 3 0 200 ffffc8d627c88140 npfgc0 npfgcw
0 121 3 1 200 ffffc8d627bfe540 rt_free rt_free
0 120 3 1 200 ffffc8d627bfe100 unpgc unpgc
0 119 3 0 200 ffffc8d627c59940 key_timehandler key_timehandler
0 118 3 1 200 ffffc8d627c59500 icmp6_wqinput/1 icmp6_wqinput
0 117 3 0 200 ffffc8d627c590c0 icmp6_wqinput/0 icmp6_wqinput
0 116 3 0 200 ffffc8d627c34900 nd6_timer nd6_timer
0 115 3 1 200 ffffc8d627c344c0 carp6_wqinput/1 carp6_wqinput
0 114 3 0 200 ffffc8d627c34080 carp6_wqinput/0 carp6_wqinput
0 113 3 1 200 ffffc8d627c0f8c0 carp_wqinput/1 carp_wqinput
0 112 3 0 200 ffffc8d627c0f480 carp_wqinput/0 carp_wqinput
0 111 3 1 200 ffffc8d627c0f040 icmp_wqinput/1 icmp_wqinput
0 110 3 0 200 ffffc8d627bfabc0 icmp_wqinput/0 icmp_wqinput
0 109 3 0 200 ffffc8d627bfa780 rt_timer rt_timer
0 108 3 0 200 ffffc8d627bfa340 vmem_rehash vmem_rehash
0 107 3 0 200 ffffc8d627bddb80 entbutler entropy
0 98 2 1 240 ffffc8d62756a700 viomb
0 97 3 1 200 ffffc8d62756a2c0 vioif0_txrx/1 vioif0_txrx
0 96 3 0 200 ffffc8d62753db00 vioif0_txrx/0 vioif0_txrx
0 29 3 1 200 ffffc8d62753d280 scsibus0 sccomp
0 28 3 0 200 ffffc8d625fd3ac0 pms0 pmsreset
0 27 3 1 200 ffffc8d625fd3680 xcall/1 xcall
0 26 1 1 200 ffffc8d625fd3240 softser/1
0 25 1 1 200 ffffc8d625f9ea80 softclk/1
0 24 1 1 200 ffffc8d625f9e640 softbio/1
0 23 1 1 200 ffffc8d625f9e200 softnet/1
0 22 1 1 201 ffffc8d754f3ba40 idle/1
0 21 3 1 200 ffffc8d754f3b600 lnxsyswq lnxsyswq
0 20 3 1 200 ffffc8d754f3b1c0 lnxubdwq lnxubdwq
0 19 3 1 200 ffffc8d754f40a00 lnxpwrwq lnxpwrwq
0 18 3 1 200 ffffc8d754f405c0 lnxlngwq lnxlngwq
0 17 3 1 200 ffffc8d754f40180 lnxhipwq lnxhipwq
0 16 3 0 200 ffffc8d754f619c0 lnxrcugc lnxrcugc
0 15 3 0 200 ffffc8d754f61580 sysmon smtaskq
0 14 3 1 200 ffffc8d754f61140 pmfsuspend pmfsuspend
0 13 3 0 200 ffffc8d754f6a980 pmfevent pmfevent
0 12 3 1 200 ffffc8d754f6a540 sopendfree sopendfr
0 11 3 1 200 ffffc8d754f6a100 iflnkst iflnkst
0 10 3 1 200 ffffc8d755f9b940 nfssilly nfssilly
0 9 3 0 200 ffffc8d755f9b500 vdrain vdrain
0 8 3 1 200 ffffc8d755f9b0c0 modunload mod_unld
0 7 3 0 200 ffffc8d755fc6900 xcall/0 xcall
0 6 1 0 200 ffffc8d755fc64c0 softser/0
0 5 1 0 200 ffffc8d755fc6080 softclk/0
0 4 1 0 200 ffffc8d755ff38c0 softbio/0
0 3 1 0 200 ffffc8d755ff3480 softnet/0
0 2 1 0 201 ffffc8d755ff3040 idle/0
0 0 3 0 200 ffffffff8652e380 swapper uvm
[Locks tracked through LWPs]

****** LWP 602.602 (dhcpcd) @ 0xffffc8d6305d6740, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff869bc980 type : sleep/adaptive
initialized : 0xffffffff836cbbe7
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffffc8d6305d6740 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 739.739 (dhcpcd) @ 0xffffc8d6311af0c0, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff869bc980 type : sleep/adaptive
initialized : 0xffffffff836cbbe7
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffffc8d6311af0c0 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) @ 0xffffc8d63050d2c0, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff869bc980 type : sleep/adaptive
initialized : 0xffffffff836cbbe7
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffffc8d63050d2c0 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) @ 0xffffc8d6305d6300, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff869bc980 type : sleep/adaptive
initialized : 0xffffffff836cbbe7
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffffc8d6305d6300 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) @ 0xffffc8d754f6a100, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff869bc980 type : sleep/adaptive
initialized : 0xffffffff836cbbe7
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 1 last held: 0
relevant lwp : 0xffffc8d754f6a100 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) @ 0xffffc8d755fc6080, l_stat=1

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff869bc980 type : sleep/adaptive
initialized : 0xffffffff836cbbe7
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffffc8d755fc6080 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) @ 0xffffffff8652e380, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff869bc980 type : sleep/adaptive
initialized : 0xffffffff836cbbe7
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffffffff8652e380 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
0xffff9a8000007180 0045 00000000 0x0 0x0
0xffff9a8000007200 0045 00000000 0x0 0x0
0xffff9a8000007280 0045 00000000 0x0 0x0
0xffff9a8000007300 0045 00000000 0x0 0x0
0xffff9a8000007380 0045 00000000 0x0 0x0
0xffff9a8000007400 0045 00000000 0x0 0x0
0xffff9a8000007480 0045 00000000 0x0 0x0
0xffff9a8000007500 0045 00000000 0x0 0x0
0xffff9a8000007580 0045 00000000 0x0 0x0
0xffff9a8000007600 0045 00000000 0x0 0x0
0xffff9a8000007680 0041 00000000 0x0 0x0
0xffff9a8000007700 0041 00000000 0x0 0x0
0xffff9a8000007780 0041 00000000 0x0 0x0
0xffff9a8000007800 0041 00000000 0x0 0x0
0xffff9a8000007880 0041 00000000 0x0 0x0
0xffff9a8000007900 0045 00000000 0x0 0x0
0xffff9a8000007980 0041 00000000 0x0 0x0
0xffff9a8000007a00 0041 00000000 0x0 0x0
0xffff9a8000007a80 0041 00000000 0x0 0x0
0xffff9a8000007b00 0041 00000000 0x0 0x0
0xffff9a8000007b80 0041 00000000 0x0 0x0
0xffff9a8000007c00 0041 00000000 0x0 0x0
0xffff9a8000007c80 0041 00000000 0x0 0x0
0xffff9a8000007d00 0041 00000000 0x0 0x0
0xffff9a8000007d80 0041 00000000 0x0 0x0
0xffff9a8000007e00 0041 00000000 0x0 0x0
0xffff9a8000007e80 0041 00000000 0x0 0x0
0xffff9a8000007f00 0041 00000000 0x0 0x0
0xffff9a8000007f80 0041 00000000 0x0 0x0
0xffff9a8000008000 0041 00000000 0x0 0x0
0xffff9a8000008080 0041 00000000 0x0 0x0
0xffff9a8000008100 0041 00000000 0x0 0x0
0xffff9a8000008180 0041 00000000 0x0 0x0
0xffff9a8000008200 0041 00000000 0x0 0x0
0xffff9a8000008280 0041 00000000 0x0 0x0
0xffff9a8000008300 0041 00000000 0x0 0x0
0xffff9a8000008380 0041 00000000 0x0 0x0
0xffff9a8000008400 0041 00000000 0x0 0x0
0xffff9a8000008480 0041 00000000 0x0 0x0
0xffff9a8000008500 0041 00000000 0x0 0x0
0xffff9a8000008580 0041 00000000 0x0 0x0
0xffff9a8000008600 0041 00000000 0x0 0x0
0xffff9a8000008680 0041 00000000 0x0 0x0
0xffff9a8000008700 0041 00000000 0x0 0x0
0xffff9a8000008780 0041 00000000 0x0 0x0
0xffff9a8000008800 0041 00000000 0x0 0x0
0xffff9a8000008880 0041 00000000 0x0 0x0
0xffff9a8000008900 0041 00000000 0x0 0x0
0xffff9a8000008980 0041 00000000 0x0 0x0
0xffff9a8000008a00 0041 00000000 0x0 0x0
0xffff9a8000008a80 0041 00000000 0x0 0x0
0xffff9a8000008b00 0041 00000000 0x0 0x0
0xffff9a8000008b80 0045 00000000 0x0 0x0
0xffff9a8000008c00 0045 00000000 0x0 0x0
0xffff9a8000008c80 0041 00000000 0x0 0x0
0xffff9a8000008d00 0041 00000000 0x0 0x0
0xffff9a8000008d80 0041 00000000 0x0 0x0
0xffff9a8000008e00 0041 00000000 0x0 0x0
0xffff9a8000008e80 0041 00000000 0x0 0x0
0xffff9a8000008f00 0041 00000000 0x0 0x0
0xffff9a8000008f80 0041 00000000 0x0 0x0
0xffff9a8000009000 0041 00000000 0x0 0x0
0xffff9a8000009080 0045 00000000 0x0 0x0
0xffff9a8000009100 0041 00000000 0x0 0x0
0xffff9a8000009180 0041 00000000 0x0 0x0
0xffff9a8000009200 0041 00000000 0x0 0x0
0xffff9a8000009280 0041 00000000 0x0 0x0
0xffff9a8000009300 0041 00000000 0x0 0x0
0xffff9a8000009380 0041 00000000 0x0 0x0
0xffff9a8000009400 0041 00000000 0x0 0x0
0xffff9a8000009480 0041 00000000 0x0 0x0
0xffff9a8000009500 0041 00000000 0x0 0x0
0xffff9a8000009580 0041 00000000 0x0 0x0
0xffff9a8000009600 0041 00000000 0x0 0x0
0xffff9a8000009680 0041 00000000 0x0 0x0
0xffff9a8000009700 0041 00000000 0x0 0x0
0xffff9a8000009780 0041 00000000 0x0 0x0
0xffff9a8000009800 0041 00000000 0x0 0x0
0xffff9a8000009880 0041 00000000 0x0 0x0
0xffff9a8000009900 0041 00000000 0x0 0x0
0xffff9a8000009980 0041 00000000 0x0 0x0
0xffff9a8000009a00 0041 00000000 0x0 0x0
0xffff9a8000009a80 0041 00000000 0x0 0x0
0xffff9a8000009b00 0041 00000000 0x0 0x0
0xffff9a8000009b80 0041 00000000 0x0 0x0
0xffff9a8000009c00 0041 00000000 0x0 0x0
0xffff9a8000009c80 0041 00000000 0x0 0x0
0xffff9a8000009d00 0041 00000000 0x0 0x0
0xffff9a8000009d80 0041 00000000 0x0 0x0
0xffff9a8000009e00 0041 00000000 0x0 0x0
0xffff9a8000009e80 0041 00000000 0x0 0x0
0xffff9a8000009f00 0041 00000000 0x0 0x0
0xffff9a8000009f80 0041 00000000 0x0 0x0
0xffff9a800000a000 0041 00000000 0x0 0x0
0xffff9a800000a080 0041 00000000 0x0 0x0
0xffff9a800000a100 0041 00000000 0x0 0x0
0xffff9a800000a180 0041 00000000 0x0 0x0
0xffff9a800000a200 0041 00000000 0x0 0x0
0xffff9a800000a280 0045 00000000 0x0 0x0
0xffff9a800000a300 0041 00000000 0x0 0x0
0xffff9a800000a380 0041 00000000 0x0 0x0
0xffff9a800000a400 0041 00000000 0x0 0x0
0xffff9a800000a480 0041 00000000 0x0 0x0
0xffff9a800000a500 0041 00000000 0x0 0x0
0xffff9a800000a580 0041 00000000 0x0 0x0
0xffff9a800000a600 0045 00000000 0x0 0x0
0xffff9a800000a680 0041 00000000 0x0 0x0
0xffff9a800000a700 0041 00000000 0x0 0x0
0xffff9a800000a780 0041 00000000 0x0 0x0
0xffff9a800000a800 0041 00000000 0x0 0x0
0xffff9a800000a880 0041 00000000 0x0 0x0
0xffff9a800000a900 0041 00000000 0x0 0x0
0xffff9a800000a980 0041 00000000 0x0 0x0
0xffff9a800000aa00 0041 00000000 0x0 0x0
0xffff9a800000aa80 0041 00000000 0x0 0x0
0xffff9a800000ab00 0041 00000000 0x0 0x0
0xffff9a800000ab80 0041 00000000 0x0 0x0
0xffff9a800000ac00 0041 00000000 0x0 0x0
0xffff9a800000ac80 0041 00000000 0x0 0x0
0xffff9a800000ad00 0041 00000000 0x0 0x0
0xffff9a800000ad80 0041 00000000 0x0 0x0
0xffff9a800000ae00 0041 00000000 0x0 0x0
0xffff9a800000ae80 0045 00000000 0x0 0x0
0xffff9a800000af00 0045 00000000 0x0 0x0
0xffff9a800000af80 0041 00000000 0x0 0x0
0xffff9a800000b000 0041 00000000 0x0 0x0
0xffff9a800000b080 0041 00000000 0x0 0x0
0xffff9a800000b100 0041 00000000 0x0 0x0
0xffff9a800000b180 0045 00000000 0x0 0x0
0xffff9a800000b200 0045 00000000 0x0 0x0
0xffff9a800000b280 0045 00000000 0x0 0x0
0xffff9a800000b300 0045 00000000 0x0 0x0
0xffff9a800000b380 0045 00000000 0x0 0x0
0xffff9a800000b400 0041 00000000 0x0 0x0
0xffff9a800000b480 0041 00000000 0x0 0x0
0xffff9a800000b500 0045 00000000 0x0 0x0
0xffff9a800000b580 0045 00000000 0x0 0x0
0xffff9a800000b600 0045 00000000 0x0 0x0
0xffff9a800000b680 0045 00000000 0x0 0x0
0xffff9a800000b700 0045 00000000 0x0 0x0
0xffff9a800000b780 0045 00000000 0x0 0x0
0xffff9a800000b800 0041 00000000 0x0 0x0
0xffff9a800000b880 0041 00000000 0x0 0x0
0xffff9a800000b900 0045 00000000 0x0 0x0
0xffff9a800000b980 0045 00000000 0x0 0x0
0xffff9a800000ba00 0045 00000000 0x0 0x0
0xffff9a800000ba80 0045 00000000 0x0 0x0
0xffff9a800000bb00 0045 00000000 0x0 0x0
0xffff9a800000bb80 0045 00000000 0x0 0x0
0xffff9a800000bc00 0045 00000000 0x0 0x0
0xffff9a800000bc80 0041 00000000 0x0 0x0
0xffff9a800000bd00 0045 00000000 0x0 0x0
0xffff9a800000bd80 0045 00000000 0x0 0x0
0xffff9a800000be00 0045 00000000 0x0 0x0
0xffff9a800000be80 0045 00000000 0x0 0x0
0xffff9a800000bf00 0045 00000000 0x0 0x0
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0xffff9a8000019300 0001 00000000 0x0 0x0
0xffff9a8000019380 0001 00000000 0x0 0x0
0xffff9a8000019400 0001 00000000 0x0 0x0
0xffff9a8000019480 0001 00000000 0x0 0x0
0xffff9a8000019500 0001 00000000 0x0 0x0
0xffff9a8000019580 0001 00000000 0x0 0x0
0xffff9a8000019600 0001 00000000 0x0 0x0
0xffff9a8000019680 0001 00000000 0x0 0x0
0xffff9a8000019700 0001 00000000 0x0 0x0
0xffff9a8000019780 0001 00000000 0x0 0x0
0xffff9a8000019800 0001 00000000 0x0 0x0
0xffff9a8000019880 0001 00000000 0x0 0x0
0xffff9a8000019900 0001 00000000 0x0 0x0
0xffff9a8000019980 0001 00000000 0x0 0x0
0xffff9a8000019a00 0001 00000000 0x0 0x0
0xffff9a8000019a80 0001 00000000 0x0 0x0
0xffff9a8000019b00 0001 00000000 0x0 0x0
0xffff9a8000019b80 0001 00000000 0x0 0x0
0xffff9a8000019c00 0001 00000000 0x0 0x0
0xffff9a8000019c80 0001 00000000 0x0 0x0
0xffff9a8000019d00 0001 00000000 0x0 0x0
0xffff9a8000019d80 0001 00000000 0x0 0x0
0xffff9a8000019e00 0001 00000000 0x0 0x0
0xffff9a8000019e80 0001 00000000 0x0 0x0
0xffff9a8000019f00 0001 00000000 0x0 0x0
0xffff9a8000019f80 0001 00000000 0x0 0x0
0xffff9a800001a000 0001 00000000 0x0 0x0
0xffff9a800001a080 0001 00000000 0x0 0x0
0xffff9a800001a100 0001 00000000 0x0 0x0
0xffff9a800001a180 0001 00000000 0x0 0x0
0xffff9a800001a200 0001 00000000 0x0 0x0
0xffff9a800001a280 0001 00000000 0x0 0x0
0xffff9a800001a300 0001 00000000 0x0 0x0
0xffff9a800001a380 0001 00000000 0x0 0x0
0xffff9a800001a400 0001 00000000 0x0 0x0
0xffff9a800001a480 0001 00000000 0x0 0x0
0xffff9a800001a500 0001 00000000 0x0 0x0
0xffff9a800001a580 0001 00000000 0x0 0x0
0xffff9a800001a600 0001 00000000 0x0 0x0
0xffff9a800001a680 0001 00000000 0x0 0x0
0xffff9a800001a700 0001 00000000 0x0 0x0
0xffff9a800001a780 0001 00000000 0x0 0x0
0xffff9a800001a800 0001 00000000 0x0 0x0
0xffff9a800001a880 0001 00000000 0x0 0x0
0xffff9a800001a900 0041 00000000 0x0 0x0
0xffff9a800001a980 0041 00000000 0x0 0x0
0xffff9a800001aa00 0041 00000000 0x0 0x0
0xffff9a800001aa80 0041 00000000 0x0 0x0
0xffff9a800001ab00 0041 00000000 0x0 0x0
0xffff9a800001ab80 0041 00000000 0x0 0x0
0xffff9a800001ac00 0041 00000000 0x0 0x0
0xffff9a800001ac80 0041 00000000 0x0 0x0
0xffff9a800001ad00 0041 00000000 0x0 0x0
0xffff9a800001ad80 0041 00000000 0x0 0x0
0xffff9a800001ae00 0041 00000000 0x0 0x0
0xffff9a800001ae80 0041 00000000 0x0 0x0
0xffff9a800001af00 0041 00000000 0x0 0x0
0xffff9a800001af80 0041 00000000 0x0 0x0
0xffff9a800001b000 0041 00000000 0x0 0x0
0xffff9a800001b080 0041 00000000 0x0 0x0
0xffff9a800001b100 0041 00000000 0x0 0x0
0xffff9a800001b180 0041 00000000 0x0 0x0
0xffff9a800001b200 0041 00000000 0x0 0x0
0xffff9a800001b280 0041 00000000 0x0 0x0
0xffff9a800001b300 0041 00000000 0x0 0x0
0xffff9a800001b380 0041 00000000 0x0 0x0
0xffff9a800001b400 0041 00000000 0x0 0x0
0xffff9a800001b480 0041 00000000 0x0 0x0
0xffff9a800001b500 0041 00000000 0x0 0x0
0xffff9a800001b580 0041 00000000 0x0 0x0
0xffff9a800001b600 0041 00000000 0x0 0x0
0xffff9a800001b680 0045 00000000 0x0 0x0
0xffff9a800001b700 0045 00000000 0x0 0x0
0xffff9a800001b780 0041 00000000 0x0 0x0
0xffff9a800001b800 0045 00000000 0x0 0x0
0xffff9a800001b880 0041 00000000 0x0 0x0
0xffff9a800001b900 0045 00000000 0x0 0x0
0xffff9a800001b980 0041 00000000 0x0 0x0
0xffff9a800001ba00 0045 00000000 0x0 0x0
0xffff9a800001ba80 0045 00000000 0x0 0x0
0xffff9a800001bb00 0045 00000000 0x0 0x0
0xffff9a800001bb80 0045 00000000 0x0 0x0
0xffff9a800001bc00 0045 00000000 0x0 0x0
0xffff9a800001bc80 0041 00000000 0x0 0x0
0xffff9a800001bd00 0045 00000000 0x0 0x0
0xffff9a800001bd80 0041 00000000 0x0 0x0
0xffff9a800001be00 0045 00000000 0x0 0x0
0xffff9a800001be80 0045 00000000 0x0 0x0
0xffff9a800001bf00 0045 00000000 0x0 0x0
0xffff9a800001bf80 0045 00000000 0x0 0x0
0xffff9a800001c000 0045 00000000 0x0 0x0
0xffff9a800001c080 0041 00000000 0x0 0x0
0xffff9a800001c100 0001 00000000 0x0 0x0
0xffff9a800001c180 0001 00000000 0x0 0x0
0xffff9a800001c200 0001 00000000 0x0 0x0
0xffff9a800001c280 0001 00000000 0x0 0x0
0xffff9a800001c300 0001 00000000 0x0 0x0
0xffff9a800001c380 0001 00000000 0x0 0x0
0xffff9a800001c400 0001 00000000 0x0 0x0
0xffff9a800001c480 0001 00000000 0x0 0x0
0xffff9a800001c500 0001 00000000 0x0 0x0
0xffff9a800001c580 0001 00000000 0x0 0x0
0xffff9a800001c600 0001 00000000 0x0 0x0
0xffff9a800001c680 0001 00000000 0x0 0x0
0xffff9a800001c700 0001 00000000 0x0 0x0
0xffff9a800001c780 0001 00000000 0x0 0x0
0xffff9a800001c800 0001 00000000 0x0 0x0
0xffff9a800001c880 0001 00000000 0x0 0x0
0xffff9a800001c900 0001 00000000 0x0 0x0
0xffff9a800001c980 0001 00000000 0x0 0x0
0xffff9a800001ca00 0001 00000000 0x0 0x0
0xffff9a800001ca80 0001 00000000 0x0 0x0
0xffff9a800001cb00 0001 00000000 0x0 0x0
0xffff9a800001cb80 0001 00000000 0x0 0x0
0xffff9a800001cc00 0001 00000000 0x0 0x0
0xffff9a800001cc80 0001 00000000 0x0 0x0
0xffff9a800001cd00 0001 00000000 0x0 0x0
0xffff9a800001cd80 0001 00000000 0x0 0x0
0xffff9a800001ce00 0001 00000000 0x0 0x0
0xffff9a800001ce80 0001 00000000 0x0 0x0
0xffff9a800001cf00 0001 00000000 0x0 0x0
0xffff9a800001cf80 0001 00000000 0x0 0x0
0xffff9a800001d000 0001 00000000 0x0 0x0
0xffff9a800001d080 0001 00000000 0x0 0x0
0xffff9a800001d100 0001 00000000 0x0 0x0
0xffff9a800001d180 0001 00000000 0x0 0x0
0xffff9a800001d200 0001 00000000 0x0 0x0
0xffff9a800001d280 0001 00000000 0x0 0x0
0xffff9a800001d300 0001 00000000 0x0 0x0
0xffff9a800001d380 0001 00000000 0x0 0x0
0xffff9a800001d400 0001 00000000 0x0 0x0
0xffff9a800001d480 0001 00000000 0x0 0x0
0xffff9a800001d500 0001 00000000 0x0 0x0
0xffff9a800001d580 0001 00000000 0x0 0x0
0xffff9a800001d600 0001 00000000 0x0 0x0
0xffff9a800001d680 0001 00000000 0x0 0x0
0xff

---
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,

Mar 11, 2022, 11:55:21 PM3/11/22

to syzkaller-...@googlegroups.com

syzbot has found a reproducer for the following issue on:

HEAD commit: eda29d51e6aa fix reversed test
git tree: netbsd

console output: https://syzkaller.appspot.com/x/log.txt?x=12a2a93d700000

kernel config: https://syzkaller.appspot.com/x/.config?x=1420f906d33d9f1f
dashboard link: https://syzkaller.appspot.com/bug?extid=3bdd260582424a611946
compiler: g++ (Debian 10.2.1-6) 10.2.1 20210110

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14fc1b55700000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1136da61700000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3bdd26...@syzkaller.appspotmail.com

login: [ 62.2076628] panic: UBSan: Undefined Behavior in /syzkaller/managers/ci2-netbsd-kubsan/kernel/sys/kern/kern_time.c:439:4, signed integer overflow: 9223372036854775807 - -1 cannot be represented in type 'long int'

[ 62.2272741] cpu0: Begin traceback...
[ 62.2376444] vpanic() at netbsd:vpanic+0x2d0 sys/kern/subr_prf.c:290
[ 62.2676426] Report() at netbsd:Report+0x3b sys/../common/lib/libc/misc/ubsan.c:1352
[ 62.2976429] HandleOverflow() at netbsd:HandleOverflow+0x1d0 sys/../common/lib/libc/misc/ubsan.c:375
[ 62.3176423] nanosleep1() at netbsd:nanosleep1+0x926 sys/kern/kern_time.c:439
[ 62.3376420] sys_clock_nanosleep() at netbsd:sys_clock_nanosleep+0xcd sys/kern/kern_time.c:386
[ 62.3676429] sys_syscall() at netbsd:sys_syscall+0x1cf sy_call sys/sys/syscallvar.h:66 [inline]
[ 62.3676429] sys_syscall() at netbsd:sys_syscall+0x1cf sys/kern/sys_syscall.c:77
[ 62.3876431] syscall() at netbsd:syscall+0x2da sy_call sys/sys/syscallvar.h:65 [inline]
[ 62.3876431] syscall() at netbsd:syscall+0x2da sy_invoke sys/sys/syscallvar.h:94 [inline]
[ 62.3876431] syscall() at netbsd:syscall+0x2da sys/arch/x86/x86/syscall.c:138
[ 62.3977639] --- syscall (number 0) ---
[ 62.4076419] netbsd:syscall+0x2da:
[ 62.4076419] cpu0: End traceback...
[ 62.4187910] fatal breakpoint trap in supervisor mode
[ 62.4187910] trap type 1 code 0 rip 0xffffffff80221a95 cs 0x8 rflags 0x246 cr2 0x6fc5bb3eb969 ilevel 0 rsp 0xffff8080c83cd7e0
[ 62.4348986] curlwp 0xfffffb3d174d01c0 pid 1221.1107 lowest kstack 0xffff8080c83c92c0
Stopped in pid 1221.1107 (syz-executor2945) at netbsd:breakpoint+0x5: leave

?
breakpoint() at netbsd:breakpoint+0x5
db_panic() at netbsd:db_panic+0xec sys/ddb/db_panic.c:69
vpanic() at netbsd:vpanic+0x2d0 sys/kern/subr_prf.c:290
Report() at netbsd:Report+0x3b sys/../common/lib/libc/misc/ubsan.c:1352
HandleOverflow() at netbsd:HandleOverflow+0x1d0 sys/../common/lib/libc/misc/ubsan.c:375
nanosleep1() at netbsd:nanosleep1+0x926 sys/kern/kern_time.c:439
sys_clock_nanosleep() at netbsd:sys_clock_nanosleep+0xcd sys/kern/kern_time.c:386

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+0x2da sy_call sys/sys/syscallvar.h:65 [inline]
syscall() at netbsd:syscall+0x2da sy_invoke sys/sys/syscallvar.h:94 [inline]
syscall() at netbsd:syscall+0x2da sys/arch/x86/x86/syscall.c:138

--- syscall (number 0) ---
netbsd:syscall+0x2da:
Panic string: UBSan: Undefined Behavior in /syzkaller/managers/ci2-netbsd-kubsan/kernel/sys/kern/kern_time.c:439:4, signed integer overflow: 9223372036854775807 - -1 cannot be represented in type 'long int'

PID LID S CPU FLAGS STRUCT LWP * NAME WAIT

1221 1191 5 1 100000 fffffb3d166cc5c0 syz-executor2945
1221 >1107 7 0 100100 fffffb3d174d01c0 syz-executor2945
1221 1221 2 0 10000000 fffffb3d14427680 syz-executor2945
1086 1086 2 0 140 fffffb3d166cc180 syz-executor2945
1115 1115 3 0 180 fffffb3d146506c0 sshd select
845 845 3 0 180 fffffb3d1546c100 getty nanoslp
1071 1071 3 1 180 fffffb3d14c71300 getty nanoslp
1252 1252 3 0 180 fffffb3d1553f500 getty nanoslp
1253 1253 3 0 1c0 fffffb3d14427240 getty ttyraw
1065 1065 3 1 180 fffffb3d155799c0 sshd select
942 942 3 0 180 fffffb3d14bd5bc0 powerd kqueue
688 688 3 0 180 fffffb3d14427ac0 syslogd kqueue
739 739 3 0 180 fffffb3d15908040 dhcpcd poll
546 546 3 0 180 fffffb3d1497b700 dhcpcd poll
600 600 3 1 180 fffffb3d15908480 dhcpcd poll
615 615 3 1 180 fffffb3d14c71740 dhcpcd poll
289 289 3 0 180 fffffb3d14bd5780 dhcpcd poll
288 288 3 1 180 fffffb3d14c71b80 dhcpcd poll
351 351 3 0 180 fffffb3d14bd5340 dhcpcd poll
1 1 3 0 180 fffffb3d0bffe980 init wait
0 968 3 0 200 fffffb3d141f2a40 physiod physiod
0 194 3 0 200 fffffb3d1429da80 pooldrain pooldrain
0 193 3 0 200 fffffb3d1429d640 ioflush syncer
0 192 3 1 200 fffffb3d1429d200 pgdaemon pgdaemon
0 166 3 1 200 fffffb3d141f21c0 usb7 usbevt
0 165 3 1 200 fffffb3d111ada00 usb6 usbevt
0 164 3 1 200 fffffb3d111ad5c0 usb5 usbevt
0 163 3 0 200 fffffb3d111ad180 usb4 usbevt
0 31 3 0 200 fffffb3d0c0889c0 usb3 usbevt
0 63 3 0 200 fffffb3d0c088580 usb2 usbevt
0 126 3 0 200 fffffb3d0b96ab40 usb1 usbevt
0 125 3 0 200 fffffb3d0bfdd300 usb0 usbevt
0 124 3 1 200 fffffb3d0bfdd740 usbtask-dr usbtsk
0 123 3 0 200 fffffb3d0b93d6c0 usbtask-hc usbtsk
0 122 3 0 200 fffffb3d0c088140 npfgc0 npfgcw
0 121 3 1 200 fffffb3d0bffe540 rt_free rt_free
0 120 3 1 200 fffffb3d0bffe100 unpgc unpgc
0 119 2 0 200 fffffb3d0c059940 key_timehandler
0 118 3 1 200 fffffb3d0c059500 icmp6_wqinput/1 icmp6_wqinput
0 117 3 0 200 fffffb3d0c0590c0 icmp6_wqinput/0 icmp6_wqinput
0 116 3 0 200 fffffb3d0c034900 nd6_timer nd6_timer
0 115 3 1 200 fffffb3d0c0344c0 carp6_wqinput/1 carp6_wqinput
0 114 3 0 200 fffffb3d0c034080 carp6_wqinput/0 carp6_wqinput
0 113 3 1 200 fffffb3d0c00f8c0 carp_wqinput/1 carp_wqinput
0 112 3 0 200 fffffb3d0c00f480 carp_wqinput/0 carp_wqinput
0 111 3 1 200 fffffb3d0c00f040 icmp_wqinput/1 icmp_wqinput
0 110 3 0 200 fffffb3d0bffabc0 icmp_wqinput/0 icmp_wqinput
0 109 2 0 200 fffffb3d0bffa780 rt_timer
0 108 3 0 200 fffffb3d0bffa340 vmem_rehash vmem_rehash
0 107 3 0 200 fffffb3d0bfddb80 entbutler entropy
0 98 3 0 200 fffffb3d0b96a700 viomb balloon
0 97 3 1 200 fffffb3d0b96a2c0 vioif0_txrx/1 vioif0_txrx
0 96 3 0 200 fffffb3d0b93db00 vioif0_txrx/0 vioif0_txrx
0 29 3 1 200 fffffb3d0b93d280 scsibus0 sccomp
0 28 3 0 200 fffffb3d0a3d3ac0 pms0 pmsreset
0 27 3 1 200 fffffb3d0a3d3680 xcall/1 xcall
0 26 1 1 200 fffffb3d0a3d3240 softser/1
0 25 1 1 200 fffffb3d0a39ea80 softclk/1
0 24 1 1 200 fffffb3d0a39e640 softbio/1
0 23 1 1 200 fffffb3d0a39e200 softnet/1
0 > 22 1 1 201 fffffb3e3933ba40 idle/1
0 21 3 1 200 fffffb3e3933b600 lnxsyswq lnxsyswq
0 20 3 1 200 fffffb3e3933b1c0 lnxubdwq lnxubdwq
0 19 3 1 200 fffffb3e39340a00 lnxpwrwq lnxpwrwq
0 18 3 1 200 fffffb3e393405c0 lnxlngwq lnxlngwq
0 17 3 1 200 fffffb3e39340180 lnxhipwq lnxhipwq
0 16 3 1 200 fffffb3e393619c0 lnxrcugc lnxrcugc
0 15 3 0 200 fffffb3e39361580 sysmon smtaskq
0 14 3 1 200 fffffb3e39361140 pmfsuspend pmfsuspend
0 13 3 0 200 fffffb3e3936a980 pmfevent pmfevent
0 12 3 1 200 fffffb3e3936a540 sopendfree sopendfr
0 11 3 1 200 fffffb3e3936a100 iflnkst iflnkst
0 10 3 1 200 fffffb3e3a39b940 nfssilly nfssilly
0 9 3 0 200 fffffb3e3a39b500 vdrain vdrain
0 8 3 1 200 fffffb3e3a39b0c0 modunload mod_unld
0 7 3 0 200 fffffb3e3a3c6900 xcall/0 xcall
0 6 1 0 200 fffffb3e3a3c64c0 softser/0
0 5 1 0 200 fffffb3e3a3c6080 softclk/0
0 4 1 0 200 fffffb3e3a3f38c0 softbio/0
0 3 1 0 200 fffffb3e3a3f3480 softnet/0
0 2 1 0 201 fffffb3e3a3f3040 idle/0
0 0 2 0 240 ffffffff8652e380 swapper
[Locks tracked through LWPs]

****** LWP 546.546 (dhcpcd) @ 0xfffffb3d1497b700, l_stat=3

relevant lwp : 0xfffffb3d1497b700 last held: 000000000000000000