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(ffff80002a52e6a8) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80002a48ccc0,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80002a48ccc0,ffff800037667df0,ffff800037667d40) at sys_exit+0x1a syscall(ffff800037667df0) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76607e1c9b00, 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(ffff80002a52e6a8) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80002a48ccc0,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80002a48ccc0,ffff800037667df0,ffff800037667d40) at sys_exit+0x1a syscall(ffff800037667df0) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76607e1c9b00, count: -8 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800037667b40 rbx 0xffff80002a52e6a8 rdx 0 rcx 0 rax 0xffff80002a48ccc0 r8 0 r9 0x8080808080808080 r10 0x48fb7ca24078a30c r11 0xae0b416f140ba251 r12 0 r13 0x2 r14 0 r15 0x1 rip 0xffffffff81cf7a65 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800037667b30 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=509910 pid=49068 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=85, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a48ccc0 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000376171d8,0xffff800037617c08 process=0xffff80002a52e6a8 user=0xffff800037662000, vmspace=0xfffffd80691e3c30 estcpu=35, cpticks=5, pctcpu=0.1, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 86132 162290 48153 0 2 0x1006 sh 46855 456822 63670 0 2 0 syz-executor 46855 460088 63670 0 2 0x4000000 syz-executor 46855 51470 63670 0 3 0x4000080 fsleep syz-executor 43005 53042 47991 0 2 0 syz-executor 43005 390071 47991 0 3 0x4000000 futex syz-executor 75418 58380 5258 0 2 0 syz-executor 75418 119303 5258 0 2 0x4000000 syz-executor 31307 286621 66098 0 2 0 syz-executor 31307 449135 66098 0 3 0x4000000 futex syz-executor 31307 127426 66098 0 3 0x4000080 fsleep syz-executor 27068 505096 81755 0 2 0x2 syz-executor 95576 16344 81755 0 2 0x482 syz-executor 48153 492960 81755 0 3 0x82 wait syz-executor 31627 60527 81755 0 2 0x482 syz-executor 63670 338822 81755 0 2 0x482 syz-executor 5258 368268 81755 0 2 0x482 syz-executor 47991 110753 81755 0 2 0x482 syz-executor 66098 54604 81755 0 2 0x482 syz-executor 77062 95 0 0 3 0x14200 acct acct 48267 98986 0 0 3 0x14280 nfsidl nfsio 46157 190558 0 0 3 0x14280 nfsidl nfsio 44123 413820 0 0 3 0x14280 nfsidl nfsio 45684 466767 0 0 3 0x14280 nfsidl nfsio 5190 253553 0 0 3 0x14280 nfsidl nfsio 72317 474784 0 0 3 0x14280 nfsidl nfsio 85525 100380 0 0 3 0x14280 nfsidl nfsio 611 468450 0 0 3 0x14280 nfsidl nfsio 92664 384948 0 0 3 0x14280 nfsidl nfsio 25872 405612 0 0 3 0x14280 nfsidl nfsio 65184 91588 0 0 3 0x14280 nfsidl nfsio 27993 457425 0 0 3 0x14280 nfsidl nfsio 12133 139103 0 0 3 0x14280 nfsidl nfsio 72049 23282 0 0 3 0x14280 nfsidl nfsio 566 252216 0 0 3 0x14280 nfsidl nfsio 8433 334149 0 0 3 0x14280 nfsidl nfsio 87616 481238 0 0 3 0x14280 nfsidl nfsio 52630 221686 0 0 3 0x14280 nfsidl nfsio 29845 384919 0 0 3 0x14280 nfsidl nfsio 85870 450376 0 0 3 0x14280 nfsidl nfsio 25927 309179 0 0 3 0x14200 bored sosplice 81755 155580 77407 0 3 0x82 kqread syz-executor 77407 449677 41090 0 3 0x10008a sigsusp ksh 41090 486346 74190 0 3 0x98 kqread sshd-session 74190 361808 3017 0 3 0x92 kqread sshd-session 88528 381826 1 0 3 0x100083 ttyin getty 3017 59763 1 0 3 0x88 kqread sshd 53529 222403 58569 73 2 0x1100010 syslogd 58569 360511 1 0 3 0x100082 sbwait syslogd 79184 335559 1 0 3 0x100080 kqread resolvd 23444 99037 90926 77 3 0x100092 kqread dhcpleased 81889 124708 90926 77 3 0x100092 kqread dhcpleased 90926 245519 1 0 3 0x80 kqread dhcpleased 8621 390376 0 0 3 0x14200 bored smr 56762 97705 0 0 2 0x14200 zerothread 99128 35687 0 0 3 0x14200 aiodoned aiodoned 89417 324769 0 0 3 0x14200 syncer update 88212 405277 0 0 3 0x14200 cleaner cleaner 82687 211727 0 0 2 0x14200 reaper 17552 382497 0 0 3 0x14200 pgdaemon pagedaemon 5195 242874 0 0 3 0x14200 bored viomb 92282 473491 0 0 3 0x40014200 acpi0 acpi0 1016 73732 0 0 3 0x14200 bored softnet3 2765 204006 0 0 3 0x14200 bored softnet2 66651 185058 0 0 3 0x14200 bored softnet1 19716 373985 0 0 3 0x14200 bored softnet0 38830 510119 0 0 3 0x14200 bored systqmp 88356 204373 0 0 3 0x14200 bored systq 47900 66429 0 0 2 0x40014200 softclock 18062 329201 0 0 3 0x40014200 idle0 1 462467 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 10182 11063K 11570K 166960K 12377 0 pcb 17 15K 16K 166960K 338 0 rtable 211 6K 8K 166960K 2010 0 pf 34 13K 21K 166960K 193 0 ifaddr 40 7K 8K 166960K 266 0 ifgroup 54 2K 2K 166960K 290 0 sysctl 3 1K 1K 166960K 7 0 counters 31 17K 17K 166960K 93 0 ioctlops 0 0K 4K 166960K 183 0 iov 0 0K 16K 166960K 189 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1508 95K 95K 166960K 2899 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 21 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 34 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 16 57K 97K 166960K 1807 0 sigio 0 0K 0K 166960K 15 0 proc 64 75K 124K 166960K 1970 0 subproc 104 6K 7K 166960K 754 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 183 0 in_multi 86 6K 7K 166960K 677 0 ether_multi 1 0K 0K 166960K 2 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 85 387K 387K 166960K 85 0 exec 1 0K 1K 166960K 1160 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 215 72K 90K 166960K 15699 0 UVM aobj 131 4K 4K 166960K 135 0 pinsyscall 38 76K 96K 166960K 4153 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 53 0 NDP 12 0K 2K 166960K 192 0 temp 78 6816K 6888K 166960K 43790 0 kqueue 13 20K 30K 166960K 210 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 120 205 0 201 1 0 1 1 0 8 0 rtentry 112 687 0 592 4 0 4 4 0 8 1 unpcb 144 1464 0 1449 9 5 4 6 0 8 3 syncache 336 12 0 12 2 1 1 1 0 8 1 tcpqe 32 4 0 4 2 1 1 1 0 8 1 tcpcb 808 463 0 459 9 1 8 8 0 8 7 arp 88 122 0 105 1 0 1 1 0 8 0 ipq 40 10 0 7 1 0 1 1 0 8 0 ipqe 40 100 0 97 1 0 1 1 0 8 0 inpcb 336 1883 0 1873 13 6 7 7 0 8 5 nd6 104 181 0 158 1 0 1 1 0 8 0 pkpcb 40 5 0 5 2 1 1 1 0 8 1 kcovpl 48 58 0 50 1 0 1 1 0 8 0 ppxss 1072 11 0 11 2 1 1 1 0 8 1 pfstscr 40 3 0 3 1 0 1 1 0 8 1 pfrktable 1344 1 0 1 1 0 1 1 0 8 1 pfanchor 1288 6 0 3 1 0 1 1 0 8 0 pftag 88 1 0 1 1 1 0 1 0 8 0 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 128 6 0 4 1 0 1 1 0 8 0 pfstate 344 3 0 2 1 0 1 1 0 8 0 pfrule 1344 8 0 7 1 0 1 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 2784 0 2390 36 8 28 31 0 8 3 art_table 32 2787 0 2390 4 0 4 4 0 8 0 art_node 16 683 0 598 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 1 1 0 1 1 0 8 0 semapl 112 31 0 21 1 0 1 1 0 8 0 shmpl 112 132 0 4 4 0 4 4 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 3447 0 1861 100 0 100 100 0 8 0 ffsino 240 3447 0 1861 94 0 94 94 0 8 0 nchpl 144 5078 0 3344 65 0 65 65 0 8 0 uvmvnodes 80 4672 0 0 96 0 96 96 0 8 0 vnodes 216 4672 0 0 260 0 260 260 0 8 0 namei 1024 21548 0 21547 4 2 2 2 0 8 1 kstatmem 264 148 0 124 2 0 2 2 0 8 0 scsiplug 72 3 0 3 2 1 1 1 0 8 1 scxspl 216 36892 0 36892 10 7 3 8 1 8 3 plimitpl 152 356 0 338 1 0 1 1 0 8 0 sigapl 424 2017 0 1950 8 0 8 8 0 8 0 futexpl 64 14940 0 14937 1 0 1 1 0 8 0 knotepl 120 42321 0 42274 19 10 9 10 0 8 7 kqueuepl 184 268 0 259 1 0 1 1 0 8 0 pipepl 288 455 0 427 7 4 3 7 0 8 0 fdescpl 432 1978 0 1950 5 1 4 5 0 8 0 filepl 120 11022 0 10777 16 4 12 13 0 8 3 lockfpl 104 305 0 302 1 0 1 1 0 8 0 lockfspl 48 134 0 131 1 0 1 1 0 8 0 sessionpl 144 78 0 70 1 0 1 1 0 8 0 pgrppl 48 144 0 128 1 0 1 1 0 8 0 ucredpl 104 1766 0 1753 1 0 1 1 0 8 0 zombiepl 144 2465 0 2463 1 0 1 1 0 8 0 processpl 1096 2017 0 1950 7 1 6 6 0 8 1 procpl 648 3735 0 3661 9 1 8 8 0 8 1 sosppl 168 5 0 5 1 0 1 1 0 8 1 sockpl 504 3583 0 3554 59 47 12 22 0 8 7 mcl64k 65536 20 0 20 2 1 1 1 0 8 1 mcl16k 16384 2 0 2 1 1 0 1 0 8 0 mcl12k 12288 4 0 4 1 0 1 1 0 8 1 mcl9k 9216 2 0 2 2 1 1 1 0 8 1 mcl8k 8192 20 0 20 2 1 1 1 0 8 1 mcl4k 4096 4136 0 4087 14 6 8 13 0 8 1 mcl2k 2048 2061 0 2059 3 0 3 3 0 8 2 mtagpl 96 32 0 32 1 0 1 1 0 8 1 mbufpl 256 19550 0 19400 31 13 18 23 0 8 6 bufpl 280 7869 0 1622 447 0 447 447 0 8 0 anonpl 24 306674 0 303454 78 28 50 50 0 187 24 amapchunkpl 152 50790 0 50339 37 5 32 32 0 158 12 amappl16 200 5530 0 5515 29 21 8 15 0 8 7 amappl15 192 35 0 35 1 1 0 1 0 8 0 amappl14 184 220 0 210 1 0 1 1 0 8 0 amappl13 176 9 0 9 1 1 0 1 0 8 0 amappl12 168 3385 0 3357 3 1 2 3 0 8 0 amappl11 160 50 0 40 1 0 1 1 0 8 0 amappl10 152 33 0 33 1 1 0 1 0 8 0 amappl9 144 128 0 128 1 1 0 1 0 8 0 amappl8 136 16 0 15 1 0 1 1 0 8 0 amappl7 128 201 0 191 1 0 1 1 0 8 0 amappl6 120 669 0 666 1 0 1 1 0 8 0 amappl5 112 334 0 325 1 0 1 1 0 8 0 amappl4 104 458 0 442 1 0 1 1 0 8 0 amappl3 96 9890 0 9790 5 1 4 4 0 8 1 amappl2 88 1421 0 1360 2 0 2 2 0 8 0 amappl1 80 17010 0 16490 13 0 13 13 0 8 0 amappl 88 14877 0 14716 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 0 8 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 128 256 0 256 2 1 1 1 0 8 1 dma64 64 7 0 7 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 72 134 0 4 3 0 3 3 0 8 0 uaddrrnd 24 1978 0 1949 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1978 0 1949 1 0 1 1 0 8 0 vmmpekpl 168 17924 0 17869 3 0 3 3 0 8 0 vmmpepl 168 128233 0 126552 94 5 89 89 0 357 11 vmsppl 344 1977 0 1949 4 1 3 4 0 8 0 rwobjpl 24 42862 0 37228 35 0 35 35 0 8 0 pdppl 4096 3962 0 3898 182 114 68 82 0 8 4 pvpl 32 940983 0 931229 350 127 223 223 0 265 137 pmappl 216 1977 0 1949 3 1 2 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 569 0 208 11 0 11 11 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(ffff80002a52e6a8) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80002a48ccc0,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80002a48ccc0,ffff800037667df0,ffff800037667d40) at sys_exit+0x1a syscall(ffff800037667df0) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76607e1c9b00, 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(ffff80002a52e6a8) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80002a48ccc0,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80002a48ccc0,ffff800037667df0,ffff800037667d40) at sys_exit+0x1a syscall(ffff800037667df0) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76607e1c9b00, count: -8