panic: kernel diagnostic assertion "ps->ps_uvncount == 0" failed: file "/syzkaller/managers/main/kernel/sys/kern/kern_unveil.c", line 188 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82927b8e) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828e10c6,ffffffff828b33eb,bc,ffffffff82866e64) at __assert+0x29 sys/kern/subr_prf.c:157 unveil_destroy(ffff8000ffff4010) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188 exit1(ffff80002a604ab0,0,0,1) at exit1+0x3d6 sys/kern/kern_exit.c:218 sys_exit(ffff80002a604ab0,ffff80002a665760,ffff80002a6656b0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002a665760) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x740961809ac0, count: 7 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. 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+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82927b8e) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828e10c6,ffffffff828b33eb,bc,ffffffff82866e64) at __assert+0x29 sys/kern/subr_prf.c:157 unveil_destroy(ffff8000ffff4010) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188 exit1(ffff80002a604ab0,0,0,1) at exit1+0x3d6 sys/kern/kern_exit.c:218 sys_exit(ffff80002a604ab0,ffff80002a665760,ffff80002a6656b0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002a665760) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x740961809ac0, count: -8 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002a6654b0 rbx 0xffff8000ffff4010 rdx 0x3fd rcx 0 rax 0x8a r8 0x101010101010101 r9 0x8080808080808080 r10 0xb7a1e81a51ee1739 r11 0xf4e5a14ce68ef04e r12 0 r13 0x2 r14 0 r15 0x1 rip 0xffffffff811a086c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff80002a6654a0 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb> show proc PROC (syz-executor2269761477) tid=330407 pid=66570 tcnt=1 stat=onproc flags process=8001008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a604ab0 forw=0xffffffffffffffff, list=0xffff80002a5d6558,0xffffffff82e14630 process=0xffff8000ffff4010 user=0xffff80002a660000, vmspace=0xfffffd80074a2420 estcpu=36, cpticks=11, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 44207 453899 16710 0 3 0x8000082 nanoslp syz-executor2269761477 16710 375422 36781 0 3 0x810008a sigsusp ksh 36781 362871 57940 0 3 0x1800009a kqread sshd 38654 429732 1 0 3 0x18100083 ttyin getty 57940 312305 1 0 3 0x18000088 kqread sshd 85341 13763 60956 73 3 0x19100090 kqread syslogd 60956 219502 1 0 3 0x18100082 netio syslogd 3841 432820 1 0 3 0x18100080 kqread resolvd 47809 434522 73068 77 3 0x18100092 kqread dhcpleased 34716 320092 73068 77 3 0x18100092 kqread dhcpleased 73068 453173 1 0 3 0x18000080 kqread dhcpleased 92496 406398 0 0 3 0x14200 bored smr 52217 9050 0 0 3 0x14200 pgzero zerothread 48337 184428 0 0 3 0x14200 aiodoned aiodoned 36262 10713 0 0 3 0x14200 syncer update 22195 269322 0 0 3 0x14200 cleaner cleaner 5388 503820 0 0 3 0x14200 reaper reaper 39290 114086 0 0 3 0x14200 pgdaemon pagedaemon 98367 326106 0 0 3 0x14200 bored viomb 53215 320413 0 0 3 0x40014200 acpi0 acpi0 8325 92757 0 0 3 0x14200 bored softnet3 92924 319111 0 0 3 0x14200 bored softnet2 55792 247677 0 0 3 0x14200 bored softnet1 96076 167129 0 0 3 0x14200 bored softnet0 27513 175929 0 0 3 0x14200 bored systqmp 51866 166283 0 0 3 0x14200 bored systq 82378 345396 0 0 3 0x40014200 tmoslp softclock 88594 425982 0 0 3 0x40014200 idle0 1 80524 0 0 3 0x8000082 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 10137 6382K 6413K 166960K 11215 0 pcb 15 10K 10K 166960K 15 0 rtable 58 1K 2K 166960K 112 0 pf 12 6K 6K 166960K 12 0 ifaddr 11 5K 5K 166960K 11 0 ifgroup 17 1K 1K 166960K 17 0 counters 22 16K 16K 166960K 22 0 ioctlops 0 0K 2K 166960K 21 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1259 79K 79K 166960K 1275 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 1 0K 0K 166960K 1 0 proc 59 74K 75K 166960K 1293 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 in_multi 11 0K 0K 166960K 11 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 25 122K 122K 166960K 25 0 exec 0 0K 1K 166960K 246 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 99 4K 5K 166960K 4227 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 22 44K 48K 166960K 1197 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 3 0K 0K 166960K 3 0 temp 1 6788K 6852K 166960K 2930 0 kqueue 11 16K 18K 166960K 24 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 21 0 18 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 144 33 0 20 1 0 1 1 0 8 0 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpqe 32 55 0 55 1 1 0 1 0 8 0 tcpcb 808 8 0 5 1 0 1 1 0 8 0 arp 88 2 0 0 1 0 1 1 0 8 0 inpcb 360 26 0 20 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1502 0 40 92 0 92 92 0 8 0 ffsino 240 1502 0 40 86 0 86 86 0 8 0 nchpl 144 1686 0 47 61 0 61 61 0 8 0 uvmvnodes 80 1511 0 0 31 0 31 31 0 8 0 vnodes 216 1511 0 0 84 0 84 84 0 8 0 namei 1024 5748 0 5748 2 1 1 1 0 8 1 kstatmem 264 6 0 0 1 0 1 1 0 8 0 scxspl 216 5411 0 5411 9 1 8 8 1 8 8 plimitpl 152 16 0 10 1 0 1 1 0 8 0 sigapl 424 659 0 629 4 0 4 4 0 8 0 futexpl 64 1238 0 1238 1 0 1 1 0 8 1 knotepl 120 7455 0 7426 2 1 1 2 0 8 0 kqueuepl 184 20 0 13 1 0 1 1 0 8 0 pipepl 288 88 0 85 1 0 1 1 0 8 0 fdescpl 432 643 0 630 2 0 2 2 0 8 0 filepl 120 1136 0 1083 2 0 2 2 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 104 66 0 56 1 0 1 1 0 8 0 zombiepl 144 648 0 647 2 1 1 1 0 8 0 processpl 1072 659 0 629 3 0 3 3 0 8 0 procpl 680 1025 0 995 3 0 3 3 0 8 0 sockpl 488 80 0 58 3 0 3 3 0 8 0 mcl8k 8192 4 0 4 1 1 0 1 0 8 0 mcl4k 4096 10 0 10 1 1 0 1 0 8 0 mcl2k 2048 12505 0 12462 33 26 7 32 0 8 1 mtagpl 96 4 0 4 1 1 0 1 0 8 0 mbufpl 256 21181 0 21134 17 13 4 17 0 8 0 bufpl 280 2486 0 89 172 0 172 172 0 8 0 anonpl 24 169262 0 167424 23 11 12 22 0 188 0 amapchunkpl 152 14548 0 14397 7 1 6 7 0 158 0 amappl16 200 4096 0 4095 4 3 1 4 0 8 0 amappl15 192 10 0 10 1 1 0 1 0 8 0 amappl14 184 103 0 94 1 0 1 1 0 8 0 amappl13 176 7 0 7 1 1 0 1 0 8 0 amappl12 168 1140 0 1127 1 0 1 1 0 8 0 amappl11 160 49 0 39 1 0 1 1 0 8 0 amappl10 152 12 0 12 1 1 0 1 0 8 0 amappl9 144 78 0 78 1 1 0 1 0 8 0 amappl8 136 23 0 21 1 0 1 1 0 8 0 amappl7 128 358 0 355 1 0 1 1 0 8 0 amappl6 120 161 0 150 1 0 1 1 0 8 0 amappl5 112 122 0 110 1 0 1 1 0 8 0 amappl4 104 393 0 368 1 0 1 1 0 8 0 amappl3 96 3912 0 3881 1 0 1 1 0 8 0 amappl2 88 930 0 878 2 0 2 2 0 8 0 amappl1 80 10514 0 10100 11 0 11 11 0 8 0 amappl 88 3927 0 3873 2 0 2 2 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 643 0 629 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 643 0 629 1 0 1 1 0 8 0 vmmpekpl 168 7037 0 7020 1 0 1 1 0 8 0 vmmpepl 168 45505 0 44567 46 3 43 46 0 357 0 vmsppl 352 642 0 629 2 0 2 2 0 8 0 rwobjpl 24 22013 0 19883 14 0 14 14 0 8 0 pdppl 4096 1292 0 1258 48 14 34 40 0 8 0 pvpl 32 278205 0 274075 50 14 36 50 0 265 0 pmappl 216 642 0 629 1 0 1 1 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 299 0 59 9 0 9 9 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82927b8e) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828e10c6,ffffffff828b33eb,bc,ffffffff82866e64) at __assert+0x29 sys/kern/subr_prf.c:157 unveil_destroy(ffff8000ffff4010) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188 exit1(ffff80002a604ab0,0,0,1) at exit1+0x3d6 sys/kern/kern_exit.c:218 sys_exit(ffff80002a604ab0,ffff80002a665760,ffff80002a6656b0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002a665760) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x740961809ac0, count: -8 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82927b8e) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828e10c6,ffffffff828b33eb,bc,ffffffff82866e64) at __assert+0x29 sys/kern/subr_prf.c:157 unveil_destroy(ffff8000ffff4010) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188 exit1(ffff80002a604ab0,0,0,1) at exit1+0x3d6 sys/kern/kern_exit.c:218 sys_exit(ffff80002a604ab0,ffff80002a665760,ffff80002a6656b0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002a665760) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x740961809ac0, count: -8