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(ffffffff830afb12) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83067464,ffffffff83039b62,bc,ffffffff82fecb7c) at __assert+0x29 unveil_destroy(ffff80002a579148) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80002a514a48,b,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80002a514a48,ffff8000376fb6a0,ffff8000376fb5f0) at sys_exit+0x1a syscall(ffff8000376fb6a0) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78190f9cc670, 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(ffffffff830afb12) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83067464,ffffffff83039b62,bc,ffffffff82fecb7c) at __assert+0x29 unveil_destroy(ffff80002a579148) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80002a514a48,b,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80002a514a48,ffff8000376fb6a0,ffff8000376fb5f0) at sys_exit+0x1a syscall(ffff8000376fb6a0) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78190f9cc670, count: -8 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000376fb3f0 rbx 0xffff80002a579148 rdx 0 rcx 0 rax 0xffff80002a514a48 r8 0 r9 0x8080808080808080 r10 0xaca52bd670c59c5c r11 0x2a15bd9157931e28 r12 0 r13 0x2 r14 0 r15 0x1 rip 0xffffffff81598255 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000376fb3e0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=373569 pid=68049 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a514a48 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a514538,0xffff80002a5151f0 process=0xffff80002a579148 user=0xffff8000376f6000, vmspace=0xfffffd806c1a1ad0 estcpu=34, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 70837 497834 46620 0 3 0 futex syz-executor 70837 344994 46620 0 3 0x4000000 futex syz-executor 18535 487981 3886 0 3 0 futex syz-executor 18535 260535 3886 0 3 0x4000080 fsleep syz-executor 18535 262935 3886 0 2 0x4000000 syz-executor 32931 282882 43741 0 2 0 syz-executor 32931 236841 43741 0 2 0x4000000 syz-executor 32931 380868 43741 0 3 0x4000080 fsleep syz-executor 32931 110921 43741 0 3 0x4000080 fsleep syz-executor 93510 436306 87320 0 3 0x3000 suspend syz-executor 93510 49320 87320 0 3 0x4081000 futex syz-executor 93510 188680 87320 0 3 0x4081000 futex syz-executor 3886 424837 18615 0 2 0x482 syz-executor 33625 407174 18615 0 2 0x2 syz-executor 87320 70679 18615 0 2 0x482 syz-executor 37484 398730 18615 0 2 0x482 syz-executor 46620 34912 18615 0 2 0x482 syz-executor 6096 444693 18615 0 3 0x82 piperd syz-executor 98812 469400 18615 0 3 0x82 piperd syz-executor 43741 290983 18615 0 2 0x482 syz-executor 68637 433901 0 0 3 0x14200 acct acct 94815 266878 1 0 3 0x100083 ttyin getty 43629 495371 0 0 3 0x14280 nfsidl nfsio 64432 474104 0 0 3 0x14280 nfsidl nfsio 43033 512505 0 0 3 0x14280 nfsidl nfsio 93645 202817 0 0 3 0x14280 nfsidl nfsio 99176 215067 0 0 3 0x14280 nfsidl nfsio 8811 430414 0 0 3 0x14280 nfsidl nfsio 2652 92699 0 0 3 0x14280 nfsidl nfsio 18614 466869 0 0 3 0x14280 nfsidl nfsio 10717 106934 0 0 3 0x14280 nfsidl nfsio 63757 454229 0 0 3 0x14280 nfsidl nfsio 64003 224259 0 0 3 0x14280 nfsidl nfsio 71982 193130 0 0 3 0x14280 nfsidl nfsio 55566 354934 0 0 3 0x14280 nfsidl nfsio 47019 20537 0 0 3 0x14280 nfsidl nfsio 90210 193295 0 0 3 0x14280 nfsidl nfsio 44515 228735 0 0 3 0x14280 nfsidl nfsio 43174 52296 0 0 3 0x14280 nfsidl nfsio 49400 35575 0 0 3 0x14280 nfsidl nfsio 65104 524280 0 0 3 0x14280 nfsidl nfsio 67181 17625 0 0 3 0x14280 nfsidl nfsio 37550 230832 0 0 3 0x14200 bored sosplice 18615 429996 92683 0 2 0x2 syz-executor 92683 512889 27870 0 3 0x10008a sigsusp ksh 27870 230834 55032 0 3 0x98 kqread sshd-session 55032 246212 1 0 3 0x92 kqread sshd-session 27449 372387 89391 73 2 0x1100010 syslogd 89391 92774 1 0 3 0x100082 sbwait syslogd 9787 441724 1 0 3 0x100080 kqread resolvd 58841 175474 23162 77 3 0x100092 kqread dhcpleased 23895 348940 23162 77 3 0x100092 kqread dhcpleased 23162 375125 1 0 3 0x80 kqread dhcpleased 8171 373612 0 0 3 0x14200 bored smr 64663 132473 0 0 2 0x14200 zerothread 81331 238329 0 0 3 0x14200 aiodoned aiodoned 73874 439077 0 0 2 0x14600 update 38737 120614 0 0 3 0x14200 cleaner cleaner 95732 419424 0 0 2 0x14200 reaper 23540 396909 0 0 3 0x14200 pgdaemon pagedaemon 36940 314850 0 0 3 0x14200 bored viomb 13942 361583 0 0 3 0x40014200 acpi0 acpi0 109 436120 0 0 3 0x14200 bored softnet3 82231 122426 0 0 3 0x14200 bored softnet2 90176 265557 0 0 3 0x14200 bored softnet1 11819 245454 0 0 3 0x14200 bored softnet0 95717 437429 0 0 3 0x14200 bored systqmp 29424 164840 0 0 3 0x14200 bored systq 84074 15690 0 0 3 0x40014200 tmoslp softclock 45299 10351 0 0 3 0x40014200 idle0 1 246199 0 0 3 0x82 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 10209 11062K 11400K 166960K 13895 0 pcb 17 18K 20K 166960K 525 0 rtable 198 6K 8K 166960K 4011 0 pf 33 13K 268K 166960K 307 0 ifaddr 41 8K 9K 166960K 538 0 ifgroup 54 2K 2K 166960K 557 0 sysctl 4 1K 1K 166960K 10 0 counters 31 17K 17K 166960K 157 0 ioctlops 0 0K 4K 166960K 473 0 iov 0 0K 16K 166960K 120 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1531 96K 97K 166960K 4880 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 41 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 85 0 dirhash 15 2K 3K 166960K 39 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 15 53K 97K 166960K 3792 0 sigio 0 0K 0K 166960K 103 0 proc 64 75K 124K 166960K 3827 0 subproc 104 6K 7K 166960K 1603 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 642 0 in_multi 90 6K 7K 166960K 1446 0 ether_multi 1 0K 0K 166960K 15 0 mrt 1 0K 0K 166960K 9 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 229 1023K 1023K 166960K 229 0 exec 0 0K 1K 166960K 2637 0 pfkey data 0 0K 0K 166960K 4 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 205 71K 106K 166960K 30013 0 UVM aobj 131 4K 4K 166960K 135 0 pinsyscall 35 70K 100K 166960K 7757 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 95 0 NDP 14 0K 2K 166960K 390 0 temp 75 6816K 6944K 166960K 124322 0 kqueue 13 20K 26K 166960K 329 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 466 0 462 3 2 1 3 0 8 0 rtentry 112 1450 0 1361 5 1 4 4 0 8 0 unpcb 144 1779 0 1764 9 5 4 6 0 8 3 syncache 336 9 0 9 2 1 1 1 0 8 1 tcpqe 32 5 0 5 2 1 1 1 0 8 1 tcpcb 808 779 0 775 14 10 4 11 0 8 3 arp 88 264 0 247 1 0 1 1 0 8 0 ipq 40 16 0 16 1 0 1 1 0 8 1 ipqe 40 112 0 112 1 0 1 1 0 8 1 inpcb 336 3384 0 3338 19 9 10 13 0 8 5 nd6 104 381 0 360 1 0 1 1 0 8 0 pkpcb 40 20 0 20 2 1 1 1 0 8 1 kcovpl 48 123 0 115 1 0 1 1 0 8 0 ppxss 1072 5 0 5 2 1 1 1 0 8 1 pfrule 1344 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 5741 0 5338 33 3 30 31 0 8 4 art_table 32 5743 0 5338 4 0 4 4 0 8 0 art_node 16 1444 0 1365 1 0 1 1 0 8 0 sysvmsgpl 40 20 0 10 1 0 1 1 0 8 0 semapl 112 80 0 70 1 0 1 1 0 8 0 shmpl 112 132 0 4 4 0 4 4 0 8 0 dirhash 1024 35 0 16 3 0 3 3 0 8 0 dino2pl 256 5600 0 3886 108 0 108 108 0 8 0 ffsino 240 5600 0 3886 101 0 101 101 0 8 0 nchpl 144 8687 0 6855 69 0 69 69 0 8 0 uvmvnodes 80 7449 0 0 153 0 153 153 0 8 0 vnodes 216 7449 0 0 414 0 414 414 0 8 0 namei 1024 41418 0 41418 3 1 2 2 0 8 2 kstatmem 264 276 0 252 2 0 2 2 0 8 0 scsiplug 72 5 0 5 2 1 1 1 0 8 1 scxspl 216 76926 0 76926 10 7 3 8 1 8 3 plimitpl 152 838 0 822 1 0 1 1 0 8 0 sigapl 424 3866 0 3801 8 0 8 8 0 8 0 futexpl 64 30431 0 30425 1 0 1 1 0 8 0 knotepl 120 98892 0 98842 43 33 10 17 0 8 8 kqueuepl 184 536 0 527 2 1 1 2 0 8 0 pipepl 288 649 0 622 3 0 3 3 0 8 0 fdescpl 432 3824 0 3798 5 1 4 5 0 8 0 filepl 120 21215 0 20978 19 7 12 16 0 8 4 lockfpl 104 1222 0 1220 2 1 1 2 0 8 0 lockfspl 48 377 0 375 1 0 1 1 0 8 0 sessionpl 144 137 0 130 1 0 1 1 0 8 0 pgrppl 48 341 0 326 1 0 1 1 0 8 0 ucredpl 104 3745 0 3734 1 0 1 1 0 8 0 zombiepl 144 4376 0 4374 1 0 1 1 0 8 0 processpl 1096 3866 0 3801 6 0 6 6 0 8 0 procpl 648 7121 0 7046 8 0 8 8 0 8 1 sosppl 168 20 0 20 2 1 1 1 0 8 1 sockpl 504 5759 0 5694 64 47 17 28 0 8 8 mcl64k 65536 42 0 42 2 1 1 1 0 8 1 mcl16k 16384 10 0 10 2 1 1 1 0 8 1 mcl12k 12288 1 0 1 1 1 0 1 0 8 0 mcl9k 9216 2 0 2 1 0 1 1 0 8 1 mcl8k 8192 43 0 43 2 1 1 1 0 8 1 mcl4k 4096 6000 0 5947 17 9 8 17 0 8 0 mcl2k2 2112 1 0 1 1 0 1 1 0 8 1 mcl2k 2048 4494 0 4490 13 8 5 9 0 8 4 mtagpl 96 121 0 121 2 0 2 2 0 8 2 mbufpl 256 37505 0 37162 36 13 23 23 0 8 0 bufpl 280 15549 0 8100 533 0 533 533 0 8 0 anonpl 24 503013 0 499870 95 44 51 78 0 187 12 amapchunkpl 152 98236 0 97784 70 25 45 45 0 158 26 amappl16 200 8022 0 8010 64 55 9 26 0 8 7 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 339 0 330 1 0 1 1 0 8 0 amappl13 176 8 0 8 1 1 0 1 0 8 0 amappl12 168 6231 0 6205 3 1 2 3 0 8 0 amappl11 160 46 0 36 1 0 1 1 0 8 0 amappl10 152 11 0 11 1 1 0 1 0 8 0 amappl9 144 131 0 130 2 1 1 1 0 8 0 amappl8 136 20 0 18 1 0 1 1 0 8 0 amappl7 128 329 0 318 1 0 1 1 0 8 0 amappl6 120 1299 0 1296 1 0 1 1 0 8 0 amappl5 112 588 0 579 1 0 1 1 0 8 0 amappl4 104 636 0 624 1 0 1 1 0 8 0 amappl3 96 18835 0 18737 5 1 4 4 0 8 1 amappl2 88 2247 0 2191 2 0 2 2 0 8 0 amappl1 80 25179 0 24754 13 2 11 13 0 8 0 amappl 88 28671 0 28514 5 0 5 5 0 92 1 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 254 0 254 2 1 1 1 0 8 1 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 8 0 8 2 1 1 1 0 8 1 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 134 0 4 3 0 3 3 0 8 0 uaddrrnd 24 3824 0 3797 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3824 0 3797 1 0 1 1 0 8 0 vmmpekpl 168 29662 0 29595 4 0 4 4 0 8 0 vmmpepl 168 234238 0 232747 108 24 84 95 0 357 12 vmsppl 344 3823 0 3797 4 1 3 4 0 8 0 rwobjpl 24 70245 0 61931 51 0 51 51 0 8 0 pdppl 4096 7654 0 7594 306 240 66 82 0 8 6 pvpl 32 1867844 0 1858911 478 256 222 359 0 265 117 pmappl 216 3823 0 3797 3 1 2 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 734 0 347 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(ffffffff830afb12) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83067464,ffffffff83039b62,bc,ffffffff82fecb7c) at __assert+0x29 unveil_destroy(ffff80002a579148) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80002a514a48,b,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80002a514a48,ffff8000376fb6a0,ffff8000376fb5f0) at sys_exit+0x1a syscall(ffff8000376fb6a0) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78190f9cc670, 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(ffffffff830afb12) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83067464,ffffffff83039b62,bc,ffffffff82fecb7c) at __assert+0x29 unveil_destroy(ffff80002a579148) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80002a514a48,b,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80002a514a48,ffff8000376fb6a0,ffff8000376fb5f0) at sys_exit+0x1a syscall(ffff8000376fb6a0) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78190f9cc670, count: -8