panic: kernel diagnostic assertion "ps->ps_uvncount == 0" faile d: file "/syzkaller/managers/main/kernel/sys/kern/kern_unveil.c ", line 188 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff830b4120) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83068a43,ffffffff83037d30,bc,ffffffff82fead27) at __assert+0x29 unveil_destroy(ffff80002a464450) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80002a4e2030,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80002a4e2030,ffff80002a50bf20,ffff80002a50be70) at sys_exit+0x1a syscall(ffff80002a50bf20) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d3d2d2537e0, count: 7 https://www.openbsd.org/ddb.html describes the minimum info req uired in bug reports. Insufficient info makes it difficult to find and fix b ugs. ddb> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: kernel diagnostic assertion "ps->ps_uvncount == 0" failed: file "/syzkaller/managers/main/kernel/sys/kern/kern_unveil.c", line 188 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff830b4120) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83068a43,ffffffff83037d30,bc,ffffffff82fead27) at __assert+0x29 unveil_destroy(ffff80002a464450) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80002a4e2030,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80002a4e2030,ffff80002a50bf20,ffff80002a50be70) at sys_exit+0x1a syscall(ffff80002a50bf20) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d3d2d2537e0, count: -8 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002a50bc70 rbx 0xffff80002a464450 rdx 0 rcx 0 rax 0xffff80002a4e2030 r8 0x101010101010101 r9 0x8080808080808080 r10 0x3af95739225f457d r11 0x4c603596285095e1 r12 0 r13 0x2 r14 0 r15 0x1 rip 0xffffffff81cf7a65 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a50bc60 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=455019 pid=10327 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a4e2030 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a4ee038,0xffff80002a4a2538 process=0xffff80002a464450 user=0xffff80002a506000, vmspace=0xfffffd8074c7e818 estcpu=36, cpticks=21, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 17473 300443 69835 0 2 0 syz-executor 17473 101998 69835 0 3 0x4000080 fsleep syz-executor 71596 476895 1320 0 2 0 syz-executor 71596 421952 1320 0 3 0x4000080 sbwait syz-executor 71596 196201 1320 0 2 0x4000000 syz-executor 71596 240684 1320 0 3 0x4000080 fsleep syz-executor 40226 468566 16174 0 3 0x82 piperd syz-executor 9390 483003 0 0 3 0x14200 acct acct 60885 22128 16174 0 3 0x82 piperd syz-executor 80848 224342 16174 0 2 0x2 syz-executor 1320 315794 16174 0 3 0x82 nanoslp syz-executor 42891 48250 16174 0 3 0x82 piperd syz-executor 74203 42132 16174 0 3 0x82 piperd syz-executor 19422 133567 16174 0 3 0x82 nanoslp syz-executor 69835 401551 16174 0 3 0x82 nanoslp syz-executor 82533 380623 1 0 3 0x100083 ttyin getty 69093 453058 0 0 3 0x14280 nfsidl nfsio 51802 441278 0 0 3 0x14280 nfsidl nfsio 77549 478218 0 0 3 0x14280 nfsidl nfsio 32034 353390 0 0 3 0x14280 nfsidl nfsio 89061 281654 0 0 3 0x14280 nfsidl nfsio 90905 472214 0 0 3 0x14280 nfsidl nfsio 95247 450594 0 0 3 0x14280 nfsidl nfsio 63449 106604 0 0 3 0x14280 nfsidl nfsio 87777 278508 0 0 3 0x14280 nfsidl nfsio 2818 122083 0 0 3 0x14280 nfsidl nfsio 32167 334498 0 0 3 0x14280 nfsidl nfsio 92675 6363 0 0 3 0x14280 nfsidl nfsio 45295 366041 0 0 3 0x14280 nfsidl nfsio 17036 471549 0 0 3 0x14280 nfsidl nfsio 21444 41980 0 0 3 0x14280 nfsidl nfsio 56651 382908 0 0 3 0x14280 nfsidl nfsio 68198 148223 0 0 3 0x14280 nfsidl nfsio 37048 453834 0 0 3 0x14280 nfsidl nfsio 9994 387769 0 0 3 0x14280 nfsidl nfsio 64707 209778 0 0 3 0x14280 nfsidl nfsio 66379 370845 0 0 3 0x14200 bored sosplice 16174 285842 46902 0 2 0x3 syz-executor 46902 364223 48908 0 3 0x10008a sigsusp ksh 48908 201094 75623 0 3 0x98 kqread sshd-session 75623 53648 1 0 3 0x92 kqread sshd-session 31503 495732 85834 73 2 0x1100010 syslogd 85834 309348 1 0 3 0x100082 sbwait syslogd 62801 33677 1 0 3 0x100080 kqread resolvd 65901 274213 26114 77 3 0x100092 kqread dhcpleased 13215 75788 26114 77 3 0x100092 kqread dhcpleased 26114 113408 1 0 3 0x80 kqread dhcpleased 1389 445374 0 0 3 0x14200 bored smr 31791 360758 0 0 2 0x14200 zerothread 5384 209951 0 0 3 0x14200 aiodoned aiodoned 21634 447758 0 0 3 0x14200 syncer update 51064 96395 0 0 3 0x14200 cleaner cleaner 9408 293945 0 0 2 0x14200 reaper 39838 284320 0 0 3 0x14200 pgdaemon pagedaemon 55557 196291 0 0 3 0x14200 bored viomb 7885 183811 0 0 3 0x40014200 acpi0 acpi0 33663 377131 0 0 3 0x14200 bored softnet3 65752 340769 0 0 3 0x14200 bored softnet2 92272 393321 0 0 3 0x14200 bored softnet1 1700 519858 0 0 3 0x14200 bored softnet0 56120 421551 0 0 3 0x14200 bored systqmp 69784 314621 0 0 3 0x14200 bored systq 28903 5748 0 0 3 0x40014200 tmoslp softclock 20940 45159 0 0 3 0x40014200 idle0 1 56178 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10202 11058K 11635K 166960K 12320 0 pcb 17 15K 16K 166960K 192 0 rtable 248 8K 8K 166960K 2681 0 pf 32 13K 17K 166960K 218 0 ifaddr 42 8K 8K 166960K 348 0 ifgroup 50 2K 2K 166960K 374 0 sysctl 4 1K 1K 166960K 4 0 counters 30 17K 17K 166960K 112 0 ioctlops 0 0K 4K 166960K 205 0 iov 0 0K 32K 166960K 62 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1398 88K 88K 166960K 2949 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 9K 166960K 11 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 36 0 dirhash 15 2K 3K 166960K 33 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 12 41K 97K 166960K 2006 0 sigio 0 0K 0K 166960K 21 0 proc 65 75K 124K 166960K 2556 0 subproc 104 6K 6K 166960K 1042 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 119 0 in_multi 99 7K 7K 166960K 913 0 ether_multi 1 0K 0K 166960K 3 0 mrt 0 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 1420 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 184 71K 90K 166960K 15581 0 UVM aobj 19 2K 2K 166960K 22 0 pinsyscall 32 64K 100K 166960K 4905 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 46 0 NDP 11 0K 2K 166960K 253 0 temp 64 6813K 6998K 166960K 90623 0 kqueue 12 18K 32K 166960K 149 0 SYN cache 2 2352K 2360K 166960K 3 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 244 0 241 1 0 1 1 0 8 0 rtentry 112 964 0 850 4 0 4 4 0 8 0 unpcb 144 715 0 698 6 2 4 4 0 8 3 syncache 336 8 0 8 2 1 1 1 0 8 1 tcpqe 32 7 0 7 1 0 1 1 0 8 1 tcpcb 808 251 0 249 4 0 4 4 0 8 3 arp 88 170 0 152 1 0 1 1 0 8 0 ipq 40 8 0 7 1 0 1 1 0 8 0 ipqe 40 56 0 55 1 0 1 1 0 8 0 inpcb 336 1351 0 1345 19 12 7 13 0 8 6 nd6 104 245 0 221 1 0 1 1 0 8 0 pkpcb 40 4 0 4 2 1 1 1 0 8 1 kcovpl 48 80 0 72 1 0 1 1 0 8 0 ppxss 1072 6 0 6 2 1 1 1 0 8 1 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pfrktable 1344 1 0 0 1 0 1 1 0 8 0 pfanchor 1288 3 0 3 1 0 1 1 0 8 1 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 128 6 0 4 2 1 1 1 0 8 0 pfstate 344 3 0 2 2 1 1 1 0 8 0 pfrule 1344 9 0 8 1 0 1 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 3661 0 3206 29 0 29 29 0 8 0 art_table 32 3663 0 3206 4 0 4 4 0 8 0 art_node 16 928 0 826 1 0 1 1 0 8 0 sysvmsgpl 40 22 0 11 1 0 1 1 0 8 0 semapl 112 33 0 23 1 0 1 1 0 8 0 shmpl 112 19 0 3 1 0 1 1 0 8 0 dirhash 1024 32 0 13 3 0 3 3 0 8 0 dino2pl 256 3187 0 1548 103 0 103 103 0 8 0 ffsino 240 3187 0 1548 97 0 97 97 0 8 0 nchpl 144 4543 0 2772 67 0 67 67 0 8 0 uvmvnodes 80 4559 0 0 94 0 94 94 0 8 0 vnodes 216 4559 0 0 254 0 254 254 0 8 0 namei 1024 21707 0 21705 3 1 2 2 0 8 1 kstatmem 264 186 0 164 2 0 2 2 0 8 0 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 35826 0 35826 8 7 1 8 1 8 1 plimitpl 152 275 0 259 1 0 1 1 0 8 0 sigapl 424 2166 0 2104 9 1 8 8 0 8 0 futexpl 64 12718 0 12716 1 0 1 1 0 8 0 knotepl 120 29682 0 29637 17 8 9 10 0 8 7 kqueuepl 184 297 0 289 1 0 1 1 0 8 0 pipepl 288 454 0 427 7 0 7 7 0 8 4 fdescpl 432 2126 0 2103 5 1 4 5 0 8 0 filepl 120 9682 0 9445 17 5 12 13 0 8 4 lockfpl 104 230 0 228 1 0 1 1 0 8 0 lockfspl 48 98 0 96 1 0 1 1 0 8 0 sessionpl 144 96 0 89 1 0 1 1 0 8 0 pgrppl 48 186 0 171 1 0 1 1 0 8 0 ucredpl 104 1342 0 1331 1 0 1 1 0 8 0 zombiepl 144 2352 0 2351 2 1 1 1 0 8 0 processpl 1096 2166 0 2104 6 0 6 6 0 8 1 procpl 648 3430 0 3363 8 1 7 7 0 8 0 sosppl 168 4 0 4 2 1 1 1 0 8 1 sockpl 504 2327 0 2301 35 23 12 26 0 8 8 mcl64k 65536 20 0 20 2 1 1 1 0 8 1 mcl16k 16384 3 0 3 1 0 1 1 0 8 1 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl9k 9216 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 28 0 28 2 1 1 1 0 8 1 mcl4k 4096 3852 0 3798 16 8 8 15 0 8 0 mcl2k 2048 2266 0 2262 4 2 2 3 0 8 1 mtagpl 96 28 0 27 1 0 1 1 0 8 0 mbufpl 256 20362 0 20162 79 64 15 74 0 8 1 bufpl 280 9679 0 2128 540 0 540 540 0 8 0 anonpl 24 281368 0 278567 126 31 95 95 0 187 66 amapchunkpl 152 49659 0 49281 63 15 48 48 0 158 30 amappl16 200 3137 0 3122 6 4 2 6 0 8 0 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 278 0 269 1 0 1 1 0 8 0 amappl13 176 7 0 7 1 1 0 1 0 8 0 amappl12 168 3884 0 3860 3 1 2 3 0 8 0 amappl11 160 44 0 34 1 0 1 1 0 8 0 amappl10 152 8 0 8 1 1 0 1 0 8 0 amappl9 144 161 0 161 1 1 0 1 0 8 0 amappl8 136 18 0 17 1 0 1 1 0 8 0 amappl7 128 270 0 261 1 0 1 1 0 8 0 amappl6 120 880 0 878 1 0 1 1 0 8 0 amappl5 112 414 0 406 1 0 1 1 0 8 0 amappl4 104 499 0 488 1 0 1 1 0 8 0 amappl3 96 9241 0 9158 4 1 3 4 0 8 0 amappl2 88 1671 0 1614 2 0 2 2 0 8 0 amappl1 80 17580 0 17158 14 3 11 14 0 8 0 amappl 88 14622 0 14487 6 1 5 5 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 21 0 3 1 0 1 1 0 8 0 uaddrrnd 24 2126 0 2102 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2126 0 2102 1 0 1 1 0 8 0 vmmpekpl 168 17473 0 17410 4 0 4 4 0 8 0 vmmpepl 168 132054 0 130675 83 10 73 80 0 357 6 vmsppl 344 2125 0 2102 4 1 3 4 0 8 0 rwobjpl 24 41311 0 36028 32 0 32 32 0 8 0 pdppl 4096 4258 0 4204 196 136 60 82 0 8 6 pvpl 32 973557 0 965370 427 145 282 282 0 265 183 pmappl 216 2125 0 2102 3 1 2 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 607 0 251 12 0 12 12 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff830b4120) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83068a43,ffffffff83037d30,bc,ffffffff82fead27) at __assert+0x29 unveil_destroy(ffff80002a464450) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80002a4e2030,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80002a4e2030,ffff80002a50bf20,ffff80002a50be70) at sys_exit+0x1a syscall(ffff80002a50bf20) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d3d2d2537e0, count: -8 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff830b4120) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83068a43,ffffffff83037d30,bc,ffffffff82fead27) at __assert+0x29 unveil_destroy(ffff80002a464450) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80002a4e2030,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80002a4e2030,ffff80002a50bf20,ffff80002a50be70) at sys_exit+0x1a syscall(ffff80002a50bf20) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d3d2d2537e0, count: -8