assert failed: l->l_lid == pls->pl_lwpid

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syzbot

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May 21, 2020, 7:30:16 PM5/21/20

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Hello,

syzbot found the following crash on:

HEAD commit: f1b13173 Let's not waste time decrypting garbage, shall we?
git tree: netbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=12bcb09a100000
kernel config: https://syzkaller.appspot.com/x/.config?x=19c26c7ba7ac2db1
dashboard link: https://syzkaller.appspot.com/bug?extid=85a5625ba25b274ac905
compiler: clang version 3.8.0-2ubuntu4 (tags/RELEASE_380/final)

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

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+85a562...@syzkaller.appspotmail.com

[ 53.9059001] panic: kernel diagnostic assertion "l->l_lid == pls->pl_lwpid" failed: file "/syzkaller/managers/netbsd-kmsan/kernel/sys/kern/sys_process_lwpstatus.c", line 43
[ 53.9158915] cpu1: Begin traceback...
[ 53.9359343] vpanic() at netbsd:vpanic+0x7c1 sys/kern/subr_prf.c:288
[ 53.9559645] kern_assert() at netbsd:kern_assert+0x214
[ 53.9759940] ptrace_read_lwpstatus() at netbsd:ptrace_read_lwpstatus+0x32c sys/kern/sys_process_lwpstatus.c:43
[ 54.0060455] do_ptrace() at netbsd:do_ptrace+0x7061 ptrace_lwpstatus sys/kern/sys_ptrace_common.c:902 [inline]
[ 54.0060455] do_ptrace() at netbsd:do_ptrace+0x7061 sys/kern/sys_ptrace_common.c:1543
[ 54.0260780] sys_ptrace() at netbsd:sys_ptrace+0x16b sys/kern/sys_ptrace.c:225
[ 54.0561353] sys___syscall() at netbsd:sys___syscall+0x27e sys/kern/sys_syscall.c:77
[ 54.0761571] syscall() at netbsd:syscall+0x35d sy_call sys/sys/syscallvar.h:65 [inline]
[ 54.0761571] syscall() at netbsd:syscall+0x35d sy_invoke sys/sys/syscallvar.h:94 [inline]
[ 54.0761571] syscall() at netbsd:syscall+0x35d sys/arch/x86/x86/syscall.c:138
[ 54.0861748] --- syscall (number 198) ---
[ 54.0961891] netbsd:syscall+0x35d:
[ 54.1062054] cpu1: End traceback...
[ 54.1062054] fatal breakpoint trap in supervisor mode
[ 54.1062054] trap type 1 code 0 rip 0xffffffff802227cd cs 0x8 rflags 0x246 cr2 0x7b8de707a4f0 ilevel 0 rsp 0xffffa000875778d0
[ 54.1262346] curlwp 0xffffa00012c2a980 pid 808.963 lowest kstack 0xffffa000875702c0
Stopped in pid 808.963 (syz-executor.4) at netbsd:breakpoint+0x5: leave
?
breakpoint() at netbsd:breakpoint+0x5
vpanic() at netbsd:vpanic+0x7c1 sys/kern/subr_prf.c:288
kern_assert() at netbsd:kern_assert+0x214
ptrace_read_lwpstatus() at netbsd:ptrace_read_lwpstatus+0x32c sys/kern/sys_process_lwpstatus.c:43
do_ptrace() at netbsd:do_ptrace+0x7061 ptrace_lwpstatus sys/kern/sys_ptrace_common.c:902 [inline]
do_ptrace() at netbsd:do_ptrace+0x7061 sys/kern/sys_ptrace_common.c:1543
sys_ptrace() at netbsd:sys_ptrace+0x16b sys/kern/sys_ptrace.c:225
sys___syscall() at netbsd:sys___syscall+0x27e sys/kern/sys_syscall.c:77
syscall() at netbsd:syscall+0x35d sy_call sys/sys/syscallvar.h:65 [inline]
syscall() at netbsd:syscall+0x35d sy_invoke sys/sys/syscallvar.h:94 [inline]
syscall() at netbsd:syscall+0x35d sys/arch/x86/x86/syscall.c:138
--- syscall (number 198) ---
netbsd:syscall+0x35d:
ds 78c0
es e918
fs 1
gs be70
rdi 8000000000
rsi ffffab0000000000
rbp ffffa000875778d0
rbx 0
rdx ffff818005947cd0
rcx ffffa00012c2a980
rax ffffa00012e0e918
r8 1
r9 0
r10 ffffa00087577780
r11 10
r12 0
r13 104
r14 213d
r15 0
rip ffffffff802227cd breakpoint+0x5
cs 8
rflags 246
rsp ffffa000875778d0
ss 10
netbsd:breakpoint+0x5: leave
PID LID S CPU FLAGS STRUCT LWP * NAME WAIT
1405 933 2 0 0 ffffa00012e6d640 syz-executor.3
1405 1405 2 1 0 ffffa00012cee1c0 syz-executor.3
1376 1376 3 1 80 ffffa00012b3c4c0 syz-executor.5 parked
833 833 4 0 1000000 ffffa00012c2a540 syz-executor.4
976 935 3 1 80 ffffa00012e6d200 syz-executor.1 parked
976 976 2 0 10000000 ffffa00012cb2580 syz-executor.1
419 419 4 1 1000000 ffffa00012a5f480 syz-executor.4
981 978 3 1 80 ffffa00012cee600 syz-executor.0 parked
981 981 2 0 0 ffffa00012b4f500 syz-executor.0
1506 1506 4 1 1000000 ffffa00012cc8a00 syz-executor.5
1215 1215 3 1 80 ffffa00012cc8180 syz-executor.5 parked
1437 1437 4 1 1000000 ffffa00012c2a100 syz-executor.5
1469 1469 3 0 80 ffffa00012b3c080 syz-executor.5 parked
810 1375 3 1 0 ffffa00012cb29c0 syz-executor.5 vfork
810 825 3 0 80 ffffa00012cc85c0 syz-executor.5 wait
810 810 2 1 10000000 ffffa00012a5f8c0 syz-executor.5
808 > 963 7 1 0 ffffa00012c2a980 syz-executor.4
808 808 2 0 10000000 ffffa00012b4f940 syz-executor.4
796 796 2 0 0 ffffa00012b3c900 syz-executor.2
710 710 3 1 80 ffffa00012cb2140 syz-executor.0 parked
700 700 3 1 80 ffffa00012b4f0c0 syz-executor.0 parked
699 699 2 1 40 ffffa00012a5f040 syz-executor.5
698 698 2 1 40 ffffa000129d3bc0 syz-executor.4
1079 1079 2 0 40 ffffa000129d3780 syz-executor.3
696 696 2 1 40 ffffa000129d3340 syz-executor.2
694 694 2 0 40 ffffa0001291bb80 syz-executor.1
693 693 2 1 40 ffffa000113911c0 syz-executor.0
681 683 3 1 80 ffffa0001291b740 syz-fuzzer parked
681 691 3 1 c0 ffffa0001291b300 syz-fuzzer parked
681 865 3 0 80 ffffa00012889b40 syz-fuzzer kqueue
681 692 3 1 c0 ffffa00012889700 syz-fuzzer parked
681 689 3 0 80 ffffa000128892c0 syz-fuzzer parked
681 723 3 1 80 ffffa00011a42b00 syz-fuzzer parked
681 688 3 0 80 ffffa00011a426c0 syz-fuzzer parked
681 686 3 1 c0 ffffa00011a42280 syz-fuzzer parked
681 724 3 1 c0 ffffa00011261180 syz-fuzzer parked
681 684 3 0 80 ffffa000119a7200 syz-fuzzer parked
681 681 3 1 80 ffffa000112329c0 syz-fuzzer parked
678 678 3 1 80 ffffa00011a1e680 sshd select
719 719 3 0 80 ffffa000112615c0 getty nanoslp
1374 1374 3 1 80 ffffa00011232580 getty nanoslp
709 709 3 1 80 ffffa00011232140 getty nanoslp
1373 1373 3 1 c0 ffffa00011111500 getty ttyraw
887 887 3 1 80 ffffa000119a7a80 cron nanoslp
1214 1214 3 0 80 ffffa00011a1eac0 inetd kqueue
584 584 3 0 80 ffffa00011a1e240 sshd select
601 601 3 0 80 ffffa000119a7640 powerd kqueue
459 459 3 1 80 ffffa00011391a40 syslogd kqueue
303 303 3 0 80 ffffa00011391600 dhcpcd kqueue
333 333 3 0 80 ffffa00011261a00 dhcpcd kqueue
1 1 3 1 80 ffffa00010eda080 init wait
0 590 3 0 200 ffffa00011111940 physiod physiod
0 123 3 0 200 ffffa0001111b980 pooldrain pooldrain
0 122 3 0 200 ffffa0001111b540 ioflush syncer
0 121 3 1 200 ffffa0001111b100 pgdaemon pgdaemon
0 118 3 0 200 ffffa000111110c0 usb0 usbevt
0 117 3 1 200 ffffa00010eda900 usbtask-dr usbtsk
0 116 3 0 200 ffffa0000f47fac0 usbtask-hc usbtsk
0 115 3 1 200 ffffa00010eda4c0 npfgc-0 npfgccv
0 114 3 1 200 ffffa00010ecc8c0 rt_free rt_free
0 113 3 1 200 ffffa00010ecc480 unpgc unpgc
0 112 3 0 200 ffffa00010ecc040 key_timehandler key_timehandler
0 111 3 1 200 ffffa00010ec7bc0 icmp6_wqinput/1 icmp6_wqinput
0 110 3 0 200 ffffa00010ec7780 icmp6_wqinput/0 icmp6_wqinput
0 109 3 0 200 ffffa00010ec7340 nd6_timer nd6_timer
0 108 3 1 200 ffffa00010d36b80 carp6_wqinput/1 carp6_wqinput
0 107 3 0 200 ffffa00010d36740 carp6_wqinput/0 carp6_wqinput
0 106 3 1 200 ffffa00010d36300 carp_wqinput/1 carp_wqinput
0 105 3 0 200 ffffa00010d33b00 carp_wqinput/0 carp_wqinput
0 104 3 1 200 ffffa00010d336c0 icmp_wqinput/1 icmp_wqinput
0 103 3 0 200 ffffa00010d342c0 icmp_wqinput/0 icmp_wqinput
0 102 3 0 200 ffffa00010d34b40 rt_timer rt_timer
0 101 3 0 200 ffffa00010d34700 vmem_rehash vmem_rehash
0 100 3 0 200 ffffa00010d33280 entbutler entropy
0 27 3 0 200 ffffa0000f47f680 scsibus0 sccomp
0 26 3 0 200 ffffa0000f47f240 pms0 pmsreset
0 25 3 1 200 ffffa0000f464a80 xcall/1 xcall
0 24 1 1 200 ffffa0000f464640 softser/1
0 23 1 1 200 ffffa0000f464200 softclk/1
0 22 1 1 200 ffffa0000f462a40 softbio/1
0 21 1 1 200 ffffa0000f462600 softnet/1
0 20 1 1 201 ffffa0000f4621c0 idle/1
0 19 3 0 200 ffffa0000e2dda00 lnxpwrwq lnxpwrwq
0 18 3 0 200 ffffa0000e2dd5c0 lnxlngwq lnxlngwq
0 17 3 0 200 ffffa0000e2dd180 lnxsyswq lnxsyswq
0 16 3 0 200 ffffa0000e2d79c0 lnxrcugc lnxrcugc
0 15 3 0 200 ffffa0000e2d7580 sysmon smtaskq
0 14 3 0 200 ffffa0000e2d7140 pmfsuspend pmfsuspend
0 13 3 0 200 ffffa0000e2d4980 pmfevent pmfevent
0 12 3 0 200 ffffa0000e2d4540 sopendfree sopendfr
0 11 3 0 200 ffffa0000e2d4100 iflnkst iflnkst
0 10 3 0 200 ffffa0000e2cb940 nfssilly nfssilly
0 9 3 0 200 ffffa0000e2cb500 vdrain vdrain
0 8 3 1 200 ffffa0000e2cb0c0 modunload mod_unld
0 7 3 0 200 ffffa0000dcc8900 xcall/0 xcall
0 6 1 0 200 ffffa0000dcc84c0 softser/0
0 5 1 0 200 ffffa0000dcc8080 softclk/0
0 4 1 0 200 ffffa0000dcc68c0 softbio/0
0 3 1 0 200 ffffa0000dcc6480 softnet/0
0 2 1 0 201 ffffa0000dcc6040 idle/0
0 > 0 7 0 240 ffffffff859f6900 swapper
[Locks tracked through LWPs]

****** LWP 976.976 (syz-executor.1) @ 0xffffa00012cb2580, l_stat=2

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at pmap_ctor)
lock address : 0xffffa00012c31a80 type : sleep/adaptive
initialized : 0xffffffff816ba307
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 1
relevant cpu : 0 last held: 0
relevant lwp : 0xffffa00012cb2580 last held: 000000000000000000
last locked : 0xffffffff816d3d0f unlocked*: 0xffffffff816d8f46
owner field : 0xffffa00012cb2580 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 796.796 (syz-executor.2) @ 0xffffa00012b3c900, l_stat=2

*** Locks held:

* Lock 0 (initialized at amap_ctor)
lock address : 0xffffa00012b3f040 type : sleep/adaptive
initialized : 0xffffffff8444e5d3
shared holds : 0 exclusive: 1
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffffa00012b3c900 last held: 0xffffa00012b3c900
last locked* : 0xffffffff8447e3c6 unlocked : 0xffffffff84452726
owner/count : 0xffffa00012b3c900 flags : 0x0000000000000004
Turnstile: no active turnstile for this lock.

*** Locks wanted:

* Lock 0 (initialized at pmap_ctor)
lock address : 0xffffa000129f0540 type : sleep/adaptive
initialized : 0xffffffff816ba307
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 1
relevant cpu : 0 last held: 0
relevant lwp : 0xffffa00012b3c900 last held: 000000000000000000
last locked : 0xffffffff816d3d0f unlocked*: 0xffffffff816d8f46
owner field : 0xffffa00012b3c900 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.11 (iflnkst) @ 0xffffa0000e2d4100, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff85a5ee00 type : sleep/adaptive
initialized : 0xffffffff84667ee3
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffffa0000e2d4100 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) @ 0xffffa0000dcc8080, l_stat=1

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff85a5ee00 type : sleep/adaptive
initialized : 0xffffffff84667ee3
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffffa0000dcc8080 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
0xffffa00000017180 0041 00000000 0x0 0x0
0xffffa00000017200 0041 00000000 0x0 0x0
0xffffa00000017280 0041 00000000 0x0 0x0
0xffffa00000017300 0041 00000000 0x0 0x0
0xffffa00000017380 0041 00000000 0x0 0x0
0xffffa00000017400 0041 00000000 0x0 0x0
0xffffa00000017480 0041 00000000 0x0 0x0
0xffffa00000017500 0041 00000000 0x0 0x0
0xffffa00000017580 0041 00000000 0x0 0x0
0xffffa00000017600 0041 00000000 0x0 0x0
0xffffa00000017680 0041 00000000 0x0 0x0
0xffffa00000017700 0041 00000000 0x0 0x0
0xffffa00000017780 0041 00000000 0x0 0x0
0xffffa00000017800 0041 00000000 0x0 0x0
0xffffa00000017880 0041 00000000 0x0 0x0
0xffffa00000017900 0041 00000000 0x0 0x0
0xffffa00000017980 0041 00000000 0x0 0x0
0xffffa00000017a00 0041 00000000 0x0 0x0
0xffffa00000017a80 0041 00000000 0x0 0x0
0xffffa00000017b00 0041 00000000 0x0 0x0
0xffffa00000017b80 0041 00000000 0x0 0x0
0xffffa00000017c00 0041 00000000 0x0 0x0
0xffffa00000017c80 0041 00000000 0x0 0x0
0xffffa00000017d00 0041 00000000 0x0 0x0
0xffffa00000017d80 0041 00000000 0x0 0x0
0xffffa00000017e00 0041 00000000 0x0 0x0
0xffffa00000017e80 0041 00000000 0x0 0x0
0xffffa00000017f00 0041 00000000 0x0 0x0
0xffffa00000017f80 0041 00000000 0x0 0x0
0xffffa00000018000 0041 00000000 0x0 0x0
0xffffa00000018080 0041 00000000 0x0 0x0
0xffffa00000018100 0041 00000000 0x0 0x0
0xffffa00000018180 0041 00000000 0x0 0x0
0xffffa00000018200 0041 00000000 0x0 0x0
0xffffa00000018280 0041 00000000 0x0 0x0
0xffffa00000018300 0041 00000000 0x0 0x0
0xffffa00000018380 0041 00000000 0x0 0x0
0xffffa00000018400 0041 00000000 0x0 0x0
0xffffa00000018480 0041 00000000 0x0 0x0
0xffffa00000018500 0041 00000000 0x0 0x0
0xffffa00000018580 0041 00000000 0x0 0x0
0xffffa00000018600 0041 00000000 0x0 0x0
0xffffa00000018680 0041 00000000 0x0 0x0
0xffffa00000018700 0041 00000000 0x0 0x0
0xffffa00000018780 0041 00000000 0x0 0x0
0xffffa00000018800 0041 00000000 0x0 0x0
0xffffa00000018880 0041 00000000 0x0 0x0
0xffffa00000018900 0041 00000000 0x0 0x0
0xffffa00000018980 0041 00000000 0x0 0x0
0xffffa00000018a00 0041 00000000 0x0 0x0
0xffffa00000018a80 0041 00000000 0x0 0x0
0xffffa00000018b00 0041 00000000 0x0 0x0
0xffffa00000018b80 0041 00000000 0x0 0x0
0xffffa00000018c00 0041 00000000 0x0 0x0
0xffffa00000018c80 0041 00000000 0x0 0x0
0xffffa00000018d00 0041 00000000 0x0 0x0
0xffffa00000018d80 0041 00000000 0x0 0x0
0xffffa00000018e00 0041 00000000 0x0 0x0
0xffffa00000018e80 0041 00000000 0x0 0x0
0xffffa00000018f00 0041 00000000 0x0 0x0
0xffffa00000018f80 0041 00000000 0x0 0x0
0xffffa00000019000 0041 00000000 0x0 0x0
0xffffa00000019080 0041 00000000 0x0 0x0
0xffffa00000019100 0041 00000000 0x0 0x0
0xffffa00000019180 0041 00000000 0x0 0x0
0xffffa00000019200 0041 00000000 0x0 0x0
0xffffa00000019280 0041 00000000 0x0 0x0
0xffffa00000019300 0041 00000000 0x0 0x0
0xffffa00000019380 0041 00000000 0x0 0x0
0xffffa00000019400 0041 00000000 0x0 0x0
0xffffa00000019480 0041 00000000 0x0 0x0
0xffffa00000019500 0041 00000000 0x0 0x0
0xffffa00000019580 0041 00000000 0x0 0x0
0xffffa00000019600 0041 00000000 0x0 0x0
0xffffa00000019680 0041 00000000 0x0 0x0
0xffffa00000019700 0041 00000000 0x0 0x0
0xffffa00000019780 0041 00000000 0x0 0x0
0xffffa00000019800 0041 00000000 0x0 0x0
0xffffa00000019880 0041 00000000 0x0 0x0
0xffffa00000019900 0041 00000000 0x0 0x0
0xffffa00000019980 0041 00000000 0x0 0x0
0xffffa00000019a00 0041 00000000 0x0 0x0
0xffffa00000019a80 0041 00000000 0x0 0x0
0xffffa00000019b00 0041 00000000 0x0 0x0
0xffffa00000019b80 0041 00000000 0x0 0x0
0xffffa00000019c00 0041 00000000 0x0 0x0
0xffffa00000019c80 0041 00000000 0x0 0x0
0xffffa00000019d00 0041 00000000 0x0 0x0
0xffffa00000019d80 0041 00000000 0x0 0x0
0xffffa00000019e00 0041 00000000 0x0 0x0
0xffffa00000019e80 0041 00000000 0x0 0x0
0xffffa00000019f00 0041 00000000 0x0 0x0
0xffffa00000019f80 0041 00000000 0x0 0x0
0xffffa0000001a000 0041 00000000 0x0 0x0
0xffffa0000001a080 0041 00000000 0x0 0x0
0xffffa0000001a100 0041 00000000 0x0 0x0
0xffffa0000001a180 0041 00000000 0x0 0x0
0xffffa0000001a200 0041 00000000 0x0 0x0
0xffffa0000001a280 0041 00000000 0x0 0x0
0xffffa0000001a300 0041 00000000 0x0 0x0
0xffffa0000001a380 0041 00000000 0x0 0x0
0xffffa0000001a400 0041 00000000 0x0 0x0
0xffffa0000001a480 0041 00000000 0x0 0x0
0xffffa0000001a500 0041 00000000 0x0 0x0
0xffffa0000001a580 0041 00000000 0x0 0x0
0xffffa0000001a600 0041 00000000 0x0 0x0
0xffffa0000001a680 0041 00000000 0x0 0x0
0xffffa0000001a700 0041 00000000 0x0 0x0
0xffffa0000001a780 0041 00000000 0x0 0x0
0xffffa0000001a800 0041 00000000 0x0 0x0
0xffffa0000001a880 0041 00000000 0x0 0x0
0xffffa0000001a900 0041 00000000 0x0 0x0
0xffffa0000001a980 0041 00000000 0x0 0x0
0xffffa0000001aa00 0041 00000000 0x0 0x0
0xffffa0000001aa80 0041 00000000 0x0 0x0
0xffffa0000001ab00 0041 00000000 0x0 0x0
0xffffa0000001ab80 0041 00000000 0x0 0x0
0xffffa0000001ac00 0041 00000000 0x0 0x0
0xffffa0000001ac80 0041 00000000 0x0 0x0
0xffffa0000001ad00 0041 00000000 0x0 0x0
0xffffa0000001ad80 0041 00000000 0x0 0x0
0xffffa0000001ae00 0041 00000000 0x0 0x0
0xffffa0000001ae80 0041 00000000 0x0 0x0
0xffffa0000001af00 0041 00000000 0x0 0x0
0xffffa0000001af80 0041 00000000 0x0 0x0
0xffffa0000001b000 0041 00000000 0x0 0x0
0xffffa0000001b080 0041 00000000 0x0 0x0
0xffffa0000001b100 0041 00000000 0x0 0x0
0xffffa0000001b180 0041 00000000 0x0 0x0
0xffffa0000001b200 0041 00000000 0x0 0x0
0xffffa0000001b280 0041 00000000 0x0 0x0
0xffffa0000001b300 0041 00000000 0x0 0x0
0xffffa0000001b380 0041 00000000 0x0 0x0
0xffffa0000001b400 0041 00000000 0x0 0x0
0xffffa0000001b480 0041 00000000 0x0 0x0
0xffffa0000001b500 0041 00000000 0x0 0x0
0xffffa0000001b580 0041 00000000 0x0 0x0
0xffffa0000001b600 0041 00000000 0x0 0x0
0xffffa0000001b680 0041 00000000 0x0 0x0
0xffffa0000001b700 0041 00000000 0x0 0x0
0xffffa0000001b780 0041 00000000 0x0 0x0
0xffffa0000001b800 0041 00000000 0x0 0x0
0xffffa0000001b880 0041 00000000 0x0 0x0
0xffffa0000001b900 0041 00000000 0x0 0x0
0xffffa0000001b980 0041 00000000 0x0 0x0
0xffffa0000001ba00 0041 00000000 0x0 0x0
0xffffa0000001ba80 0041 00000000 0x0 0x0
0xffffa0000001bb00 0041 00000000 0x0 0x0
0xffffa0000001bb80 0041 00000000 0x0 0x0
0xffffa0000001bc00 0041 00000000 0x0 0x0
0xffffa0000001bc80 0041 00000000 0x0 0x0
0xffffa0000001bd00 0041 00000000 0x0 0x0
0xffffa0000001bd80 0041 00000000 0x0 0x0
0xffffa0000001be00 0041 00000000 0x0 0x0
0xffffa0000001be80 0041 00000000 0x0 0x0
0xffffa0000001bf00 0041 00000000 0x0 0x0
0xffffa0000001bf80 0041 00000000 0x0 0x0
0xffffa0000001c000 0041 00000000 0x0 0x0
0xffffa0000001c080 0041 00000000 0x0 0x0
0xffffa0000001c100 0041 00000000 0x0 0x0
0xffffa0000001c180 0041 00000000 0x0 0x0
0xffffa0000001c200 0041 00000000 0x0 0x0
0xffffa0000001c280 0041 00000000 0x0 0x0
0xffffa0000001c300 0041 00000000 0x0 0x0
0xffffa0000001c380 0041 00000000 0x0 0x0
0xffffa0000001c400 0041 00000000 0x0 0x0
0xffffa0000001c480 0041 00000000 0x0 0x0
0xffffa0000001c500 0041 00000000 0x0 0x0
0xffffa0000001c580 0041 00000000 0x0 0x0
0xffffa0000001c600 0041 00000000 0x0 0x0
0xffffa0000001c680 0041 00000000 0x0 0x0
0xffffa0000001c700 0041 00000000 0x0 0x0
0xffffa0000001c780 0041 00000000 0x0 0x0
0xffffa0000001c800 0041 00000000 0x0 0x0
0xffffa0000001c880 0041 00000000 0x0 0x0
0xffffa0000001c900 0041 00000000 0x0 0x0
0xffffa0000001c980 0041 00000000 0x0 0x0
0xffffa0000001ca00 0041 00000000 0x0 0x0
0xffffa0000001ca80 0041 00000000 0x0 0x0
0xffffa0000001cb00 0041 00000000 0x0 0x0
0xffffa0000001cb80 0041 00000000 0x0 0x0
0xffffa0000001cc00 0041 00000000 0x0 0x0
0xffffa0000001cc80 0041 00000000 0x0 0x0
0xffffa0000001cd00 0041 00000000 0x0 0x0
0xffffa0000001cd80 0041 00000000 0x0 0x0
0xffffa0000001ce00 0041 00000000 0x0 0x0
0xffffa0000001ce80 0041 00000000 0x0 0x0
0xffffa0000001cf00 0041 00000000 0x0 0x0
0xffffa0000001cf80 0041 00000000 0x0 0x0
0xffffa0000001d000 0041 00000000 0x0 0x0
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0xffffa0000002b680 0001 00000000 0x0 0x0
0xffffa0000002b700 0001 00000000 0x0 0x0
0xffffa0000002b780 0001 00000000 0x0 0x0
0xffffa0000002b800 0001 00000000 0x0 0x0
0xffffa0000002b880 0001 00000000 0x0 0x0
0xffffa0000002b900 0001 00000000 0x0 0x0
0xffffa0000002b980 0001 00000000 0x0 0x0
0xffffa0000002ba00 0001 00000000 0x0 0x0
0xffffa0000002ba80 0001 00000000 0x0 0x0
0xffffa0000002bb00 0001 00000000 0x0 0x0
0xffffa0000002bb80 0001 00000000 0x0 0x0
0xffffa0000002bc00 0001 00000000 0x0 0x0
0xffffa0000002bc80 0001 00000000 0x0 0x0
0xffffa0000002bd00 0001 00000000 0x0 0x0
0xffffa0000002bd80 0001 00000000 0x0 0x0
0xffffa0000002be00 0001 00000000 0x0 0x0
0xffffa0000002be80 0001 00000000 0x0 0x0
0xffffa0000002bf00 0001 00000000 0x0 0x0
0xffffa0000002bf80 0001 00000000 0x0 0x0
0xffffa0000002c000 0001 00000000 0x0 0x0
0xffffa0000002c080 0001 00000000 0x0 0x0
0xffffa0000002c100 0001 00000000 0x0 0x0
0xffffa0000002c180 0001 00000000 0x0 0x0
0xffffa0000002c200 0001 00000000 0x0 0x0
0xffffa0000002c280 0001 00000000 0x0 0x0
0xffffa0000002c300 0001 00000000 0x0 0x0
0xffffa0000002c380 0001 00000000 0x0 0x0
0xffffa0000002c400 0001 00000000 0x0 0x0
0xffffa0000002c480 0001 00000000 0x0 0x0
0xffffa0000002c500 0001 00000000 0x0 0x0
0xffffa0000002c580 0001 00000000 0x0 0x0
0xffffa0000002c600 0001 00000000 0x0 0x0
0xffffa0000002c680 0001 00000000 0x0 0x0
0xffffa0000002c700 0001 00000000 0x0 0x0
0xffffa0000002c780 0001 00000000 0x0 0x0
0xffffa0000002c800 0001 00000000 0x0 0x0
0xffffa0000002c880 0001 00000000 0x0 0x0
0xffffa0000002c900 0001 00000000 0x0 0x0
0xffffa0000002c980 0001 00000000 0x0 0x0
0xffffa0000002ca00 0001 00000000 0x0 0x0
0xffffa0000002ca80 0001 00000000 0x0 0x0
0xffffa0000002cb00 0001 00000000 0x0 0x0
0xffffa0000002cb80 0001 00000000 0x0 0x0
0xffffa0000002cc00 0001 00000000 0x0 0x0
0xffffa0000002cc80 0001 00000000 0x0 0x0
0xffffa0000002cd00 0001 00000000 0x0 0x0
0xffffa0000002cd80 0001 00000000 0x0 0x0
0xffffa0000002ce00 0001 00000000 0x0 0x0
0xffffa0000002ce80 0001 00000000 0x0 0x0
0xffffa0000002cf00 0001 00000000 0x0 0x0
0xffffa0000002cf80 0001 00000000 0x0 0x0
0xffffa0000002d000 0001 00000000 0x0 0x0
0xffffa0000002d080 0001 00000000 0x0 0x0
0xffffa0000002d100 0001 00000000 0x0 0x0
0xffffa0000002d180 0001 00000000 0x0 0x0
0xffffa0000002d200 0001 00000000 0x0 0x0
0xffffa0000002d280 0001 00000000 0x0 0x0
0xffffa0000002d300 0001 00000000 0x0 0x0
0xffffa0000002d380 0001 00000000 0x0 0x0
0xffffa0000002d400 0001 00000000 0x0 0x0
0xffffa0000002d480 0001 00000000 0x0 0x0
0xffffa0000002d500 0001 00000000 0x0 0x0
0xffffa0000002d580 0001 00000000 0x0 0x0
0xffffa0000002d600 0001 00000000 0x0 0x0
0xffffa0000002d680 0001 00000000 0x0 0x0
0xffffa0000002d700 0001 00000000 0x0 0x0
0xffffa0000002d780 0001 00000000 0x0 0x0
0xffffa0000002d800 0001 00000000 0x0 0x0
0xffffa0000002d880 0001 00000000 0x0 0x0
0xffffa0000002d900 0001 00000000 0x0 0x0
0xffffa0000002d980 0001 00000000 0x0 0x0
0xffffa0000002da00 0001 00000000 0x0 0x0
0xffffa0000002da80 0001 00000000 0x0 0x0
0xffffa0000002db00 0001 00000000 0x0 0x0
0xffffa0000002db80 0001 00000000 0x0 0x0
0xffffa0000002dc00 0001 00000000 0x0 0x0
0xffffa0000002dc80 0001 00000000 0x0 0x0
0xffffa0000002dd00 0001 00000000 0x0 0x0
0xffffa0000002dd80 0001 00000000 0x0 0x0
0xffffa0000002de00 0001 00000000 0x0 0x0
0xffffa0000002de80 0001 00000000 0x0 0x0
0xffffa0000002df00 0001 00000000 0x0 0x0
0xffffa0000002df80 0001 00000000

---
This bug 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 bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

syzbot

unread,

Jul 17, 2020, 4:11:19 AM7/17/20

to syzkaller-...@googlegroups.com

syzbot has found a reproducer for the following issue on:

HEAD commit: dfadf4a0 Add driver for Cavium Interrupt Bus.
git tree: netbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=1311c5c7100000
kernel config: https://syzkaller.appspot.com/x/.config?x=1420f906d33d9f1f
dashboard link: https://syzkaller.appspot.com/bug?extid=85a5625ba25b274ac905
compiler: g++ (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11d23280900000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17ffdb9f100000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+85a562...@syzkaller.appspotmail.com

[ 121.8403401] panic: kernel diagnostic assertion "l->l_lid == pls->pl_lwpid" failed: file "/syzkaller/managers/netbsd-kubsan/kernel/sys/kern/sys_process_lwpstatus.c", line 43
[ 121.8602794] cpu1: Begin traceback...
[ 121.9202854] vpanic() at netbsd:vpanic+0x2d3 sys/kern/subr_prf.c:290
[ 122.0902868] db_print_address.cold.0() at netbsd:db_print_address.cold.0
[ 122.2702894] ptrace_read_lwpstatus() at netbsd:ptrace_read_lwpstatus+0x2e3 sys/kern/sys_process_lwpstatus.c:43
[ 122.4502841] ptrace_lwpstatus.part.4() at netbsd:ptrace_lwpstatus.part.4+0xbc
[ 122.6202844] do_ptrace() at netbsd:do_ptrace+0x175b ptrace_lwpstatus sys/kern/sys_ptrace_common.c:851 [inline]
[ 122.6202844] do_ptrace() at netbsd:do_ptrace+0x175b sys/kern/sys_ptrace_common.c:1548
[ 122.7902872] sys_ptrace() at netbsd:sys_ptrace+0x4f sys/kern/sys_ptrace.c:227
[ 122.9502864] sys_syscall() at netbsd:sys_syscall+0x1cf sy_call sys/sys/syscallvar.h:66 [inline]
[ 122.9502864] sys_syscall() at netbsd:sys_syscall+0x1cf sys/kern/sys_syscall.c:77
[ 123.1202876] syscall() at netbsd:syscall+0x2d5 sy_call sys/sys/syscallvar.h:65 [inline]
[ 123.1202876] syscall() at netbsd:syscall+0x2d5 sy_invoke sys/sys/syscallvar.h:94 [inline]
[ 123.1202876] syscall() at netbsd:syscall+0x2d5 sys/arch/x86/x86/syscall.c:138
[ 123.1602852] --- syscall (number 0) ---
[ 123.2102864] netbsd:syscall+0x2d5:
[ 123.2202761] cpu1: End traceback...
[ 123.2302810] fatal breakpoint trap in supervisor mode
[ 123.2402762] trap type 1 code 0 rip 0xffffffff80221a85 cs 0x8 rflags 0x246 cr2 0x20000000 ilevel 0 rsp 0xffffb300bf2e3b60
[ 123.2602800] curlwp 0xffffde8c4f053500 pid 1082.1082 lowest kstack 0xffffb300bf2df2c0
Stopped in pid 1082.1082 (syz-executor3279) 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+0x2d3 sys/kern/subr_prf.c:290
db_print_address.cold.0() at netbsd:db_print_address.cold.0
ptrace_read_lwpstatus() at netbsd:ptrace_read_lwpstatus+0x2e3 sys/kern/sys_process_lwpstatus.c:43
ptrace_lwpstatus.part.4() at netbsd:ptrace_lwpstatus.part.4+0xbc
do_ptrace() at netbsd:do_ptrace+0x175b ptrace_lwpstatus sys/kern/sys_ptrace_common.c:851 [inline]
do_ptrace() at netbsd:do_ptrace+0x175b sys/kern/sys_ptrace_common.c:1548
sys_ptrace() at netbsd:sys_ptrace+0x4f sys/kern/sys_ptrace.c:227
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: kernel diagnostic assertion "l->l_lid == pls->pl_lwpid" failed: file "/syzkaller/managers/netbsd-kubsan/kernel/sys/kern/sys_process_lwpstatus.c", line 43

PID LID S CPU FLAGS STRUCT LWP * NAME WAIT

1124 1124 2 0 0 ffffde8c4fb4d1c0 syz-executor3279
1151 1151 4 1 1000000 ffffde8c4ed1f900 syz-executor3279
1118 1118 2 0 0 ffffde8c4f4c7a00 syz-executor3279
1082 >1082 7 1 0 ffffde8c4f053500 syz-executor3279
1077 1077 2 1 0 ffffde8c4f4c75c0 syz-executor3279
419 419 2 0 0 ffffde8c4edd6100 syz-executor3279
1083 1083 2 0 40 ffffde8c4edd6980 syz-executor3279
1084 1084 3 0 0 ffffde8c4f4c7180 syz-executor3279 tstile
1097 1097 2 0 40 ffffde8c4d85ab80 syz-executor3279
1078 1078 2 0 40 ffffde8c4d1b3240 syz-executor3279
1070 1070 2 0 40 ffffde8c4ed1f4c0 syz-executor3279
1111 1111 2 0 40 ffffde8c4cea3640 syz-executor3279
1092 1092 3 0 80 ffffde8c4f8889c0 syz-executor3279 nanoslp
1103 1103 3 1 80 ffffde8c4f888580 sshd select
1091 1091 3 1 80 ffffde8c4cc3e5c0 getty nanoslp
1099 1099 3 1 80 ffffde8c4cea3200 getty nanoslp
1101 1101 3 1 80 ffffde8c4f888140 getty nanoslp
1109 1109 3 0 c0 ffffde8c4f0530c0 getty ttyraw
948 948 3 1 80 ffffde8c4edd6540 sshd select
1121 1121 3 0 80 ffffde8c4f053940 powerd kqueue
554 554 3 0 80 ffffde8c4d364b00 syslogd kqueue
434 434 3 0 80 ffffde8c4d1b3ac0 dhcpcd poll
593 593 3 0 80 ffffde8c4d1b3680 dhcpcd poll
592 592 3 0 80 ffffde8c4e096780 dhcpcd poll
610 610 3 0 80 ffffde8c4d3646c0 dhcpcd poll
349 349 3 1 80 ffffde8c4d3d7b40 dhcpcd poll
348 348 3 0 80 ffffde8c4d364280 dhcpcd poll
347 347 3 0 80 ffffde8c4d3d7700 dhcpcd poll
1 1 3 1 80 ffffde8c44a8d900 init wait
0 816 3 0 200 ffffde8c4cc3ea00 physiod physiod
0 166 3 0 200 ffffde8c4cccfa40 pooldrain pooldrain
0 165 3 0 240 ffffde8c4cccf600 ioflush tstile
0 164 3 1 200 ffffde8c4cccf1c0 pgdaemon pgdaemon
0 161 3 0 200 ffffde8c4cc3e180 usb7 usbevt
0 31 3 0 200 ffffde8c49bd19c0 usb6 usbevt
0 63 3 0 200 ffffde8c49bd1580 usb5 usbevt
0 126 3 1 200 ffffde8c49bd1140 usb4 usbevt
0 125 3 0 200 ffffde8c46b84980 usb3 usbevt
0 124 3 0 200 ffffde8c46b84540 usb2 usbevt
0 123 3 0 200 ffffde8c46b84100 usb1 usbevt
0 122 2 0 240 ffffde8c44ac7940 usb0
0 121 3 1 200 ffffde8c44ac7500 usbtask-dr usbtsk
0 120 3 1 200 ffffde8c41f32ac0 usbtask-hc usbtsk
0 119 2 0 240 ffffde8c44ac70c0 npfgc0
0 118 3 1 200 ffffde8c44a8d4c0 rt_free rt_free
0 117 3 1 200 ffffde8c44a8d080 unpgc unpgc
0 116 3 0 200 ffffde8c44a988c0 key_timehandler key_timehandler
0 115 3 1 200 ffffde8c44a98480 icmp6_wqinput/1 icmp6_wqinput
0 114 3 0 200 ffffde8c44a98040 icmp6_wqinput/0 icmp6_wqinput
0 113 3 0 200 ffffde8c44a43bc0 nd6_timer nd6_timer
0 112 3 1 200 ffffde8c44a43780 carp6_wqinput/1 carp6_wqinput
0 111 3 0 200 ffffde8c44a43340 carp6_wqinput/0 carp6_wqinput
0 110 3 1 200 ffffde8c44a01700 carp_wqinput/1 carp_wqinput
0 109 3 0 200 ffffde8c44390b00 carp_wqinput/0 carp_wqinput
0 108 3 1 200 ffffde8c44a0eb80 icmp_wqinput/1 icmp_wqinput
0 107 3 0 200 ffffde8c44a0e740 icmp_wqinput/0 icmp_wqinput
0 106 3 0 200 ffffde8c44a012c0 rt_timer rt_timer
0 105 3 1 200 ffffde8c44a01b40 vmem_rehash vmem_rehash
0 104 3 1 200 ffffde8c44a0e300 entbutler entropy
0 30 3 1 200 ffffde8c443906c0 vioif0_txrx/1 vioif0_txrx
0 29 3 0 200 ffffde8c44390280 vioif0_txrx/0 vioif0_txrx
0 27 3 0 200 ffffde8c41f32680 scsibus0 sccomp
0 26 3 0 200 ffffde8c41f32240 pms0 pmsreset
0 25 3 1 200 ffffde8c41e7ca80 xcall/1 xcall
0 24 1 1 200 ffffde8c41e7c640 softser/1
0 23 1 1 200 ffffde8c41e7c200 softclk/1
0 22 1 1 200 ffffde8c41e4fa40 softbio/1
0 21 1 1 200 ffffde8c41e4f600 softnet/1
0 20 1 1 201 ffffde8c41e4f1c0 idle/1
0 19 3 0 200 ffffde8d51d91a00 lnxpwrwq lnxpwrwq
0 18 3 0 200 ffffde8d51d915c0 lnxlngwq lnxlngwq
0 17 3 0 200 ffffde8d51d91180 lnxsyswq lnxsyswq
0 16 3 0 200 ffffde8d51d9c9c0 lnxrcugc lnxrcugc
0 15 3 0 200 ffffde8d51d9c580 sysmon smtaskq
0 14 3 0 200 ffffde8d51d9c140 pmfsuspend pmfsuspend
0 13 3 0 200 ffffde8d51dbb980 pmfevent pmfevent
0 12 3 0 200 ffffde8d51dbb540 sopendfree sopendfr
0 11 3 1 200 ffffde8d51dbb100 iflnkst iflnkst
0 10 3 0 200 ffffde8d52dda940 nfssilly nfssilly
0 9 3 0 200 ffffde8d52dda500 vdrain vdrain
0 8 3 0 200 ffffde8d52dda0c0 modunload mod_unld
0 7 3 0 200 ffffde8d52e13900 xcall/0 xcall
0 6 1 0 200 ffffde8d52e134c0 softser/0
0 5 1 0 200 ffffde8d52e13080 softclk/0
0 4 1 0 200 ffffde8d52e3d8c0 softbio/0
0 3 1 0 200 ffffde8d52e3d480 softnet/0
0 2 1 0 201 ffffde8d52e3d040 idle/0
0 > 0 7 0 240 ffffffff85eef600 swapper
[Locks tracked through LWPs]

****** LWP 1118.1118 (syz-executor3279) @ 0xffffde8c4f4c7a00, l_stat=2

*** Locks held:

* Lock 0 (initialized at pmap_ctor)
lock address : 0xffffde8c4d22bf80 type : sleep/adaptive
initialized : 0xffffffff80f835b3

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

relevant lwp : 0xffffde8c4f4c7a00 last held: 0xffffde8c4f4c7a00
last locked* : 0xffffffff80f85c67 unlocked : 0xffffffff80f832f4
owner field : 0xffffde8c4f4c7a00 wait/spin: 0/0

Turnstile: no active turnstile for this lock.

*** Locks wanted:

* Lock 0 (initialized at pmap_ctor)

lock address : 0xffffde8c4d22bf88 type : sleep/adaptive
initialized : 0xffffffff80f835e2

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

relevant lwp : 0xffffde8c4f4c7a00 last held: 000000000000000000
last locked : 0xffffffff80f7081b unlocked*: 0xffffffff80f70c8a
owner/count : 000000000000000000 flags : 000000000000000000

Turnstile: no active turnstile for this lock.

****** LWP 1084.1084 (syz-executor3279) @ 0xffffde8c4f4c7180, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at uvm_obj_init)
lock address : 0xffffde8c4c2527c0 type : sleep/adaptive
initialized : 0xffffffff8313177e
shared holds : 1 exclusive: 0
shares wanted: 1 exclusive: 0
relevant cpu : 0 last held: 65535
relevant lwp : 0xffffde8c4f4c7180 last held: 000000000000000000
last locked : 0xffffffff830f892b unlocked*: 0xffffffff830f4d39
owner/count : 0x0000000000000040 flags : 000000000000000000

Turnstile: no active turnstile for this lock.

****** LWP 593.593 (dhcpcd) @ 0xffffde8c4d1b3680, l_stat=3