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(ffff8000ffff5510) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188 exit1(ffff80002c10f7f8,0,0,1) at exit1+0x3d6 sys/kern/kern_exit.c:218 sys_exit(ffff80002c10f7f8,ffff800037819d10,ffff800037819c60) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800037819d10) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c4e9d7b6590, 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(ffff8000ffff5510) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188 exit1(ffff80002c10f7f8,0,0,1) at exit1+0x3d6 sys/kern/kern_exit.c:218 sys_exit(ffff80002c10f7f8,ffff800037819d10,ffff800037819c60) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800037819d10) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c4e9d7b6590, count: -8 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800037819a60 rbx 0xffff8000ffff5510 rdx 0 rcx 0 rax 0xffff80002c10f7f8 r8 0x101010101010101 r9 0x8080808080808080 r10 0x2b96e9b892b0ca1c r11 0x3f8ba48a5c0a7c81 r12 0 r13 0x2 r14 0 r15 0x1 rip 0xffffffff811a086c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800037819a50 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) tid=357365 pid=37606 tcnt=1 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002c10f7f8 forw=0xffffffffffffffff, list=0xffff80002c10f2a8,0xffff80002a6a6010 process=0xffff8000ffff5510 user=0xffff800037814000, vmspace=0xfffffd806767a870 estcpu=36, cpticks=26, pctcpu=0.5, user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 98465 124350 97780 0 2 0 syz-executor.0 98465 40850 97780 0 3 0x4000080 fsleep syz-executor.0 43564 351429 52259 0 3 0x80 nanoslp syz-executor.3 43564 321080 52259 0 3 0x4000080 fsleep syz-executor.3 43564 259696 52259 0 3 0x4000080 fsleep syz-executor.3 24858 415871 51418 0 2 0x2 syz-executor.7 41607 268668 51418 0 3 0x82 nanoslp syz-executor.1 97780 51121 51418 0 3 0x82 nanoslp syz-executor.0 28950 457436 51418 0 2 0x2 syz-executor.2 15487 241858 51418 0 2 0x2 syz-executor.4 49060 512481 0 0 3 0x14200 acct acct 81133 379135 0 0 3 0x14280 nfsidl nfsio 77432 133289 0 0 3 0x14280 nfsidl nfsio 33036 294929 0 0 3 0x14280 nfsidl nfsio 49866 100873 0 0 3 0x14280 nfsidl nfsio 27987 179562 0 0 3 0x14280 nfsidl nfsio 50445 257142 0 0 3 0x14280 nfsidl nfsio 66512 39967 0 0 3 0x14280 nfsidl nfsio 69847 202822 0 0 3 0x14280 nfsidl nfsio 87194 385575 0 0 3 0x14280 nfsidl nfsio 15797 343575 0 0 3 0x14280 nfsidl nfsio 96962 347171 0 0 3 0x14280 nfsidl nfsio 5293 343267 0 0 3 0x14280 nfsidl nfsio 38624 43184 0 0 3 0x14280 nfsidl nfsio 31897 410452 0 0 3 0x14280 nfsidl nfsio 89655 371911 0 0 3 0x14280 nfsidl nfsio 10694 477757 0 0 3 0x14280 nfsidl nfsio 95058 390849 0 0 3 0x14280 nfsidl nfsio 98513 54842 0 0 3 0x14280 nfsidl nfsio 24998 13950 0 0 3 0x14280 nfsidl nfsio 84027 385081 0 0 3 0x14280 nfsidl nfsio 62011 45701 0 0 3 0x14200 bored sosplice 86306 90871 51418 0 2 0x2 syz-executor.6 86545 34675 51418 0 2 0x2 syz-executor.5 52259 365390 51418 0 3 0x82 nanoslp syz-executor.3 51418 380044 46820 0 3 0x1a000082 wait syz-fuzzer 51418 455063 46820 0 3 0x1e000082 nanoslp syz-fuzzer 51418 240251 46820 0 3 0x1e000082 wait syz-fuzzer 51418 75137 46820 0 3 0x1e000082 thrsleep syz-fuzzer 51418 132174 46820 0 3 0x1e000082 thrsleep syz-fuzzer 51418 228945 46820 0 3 0x1e000082 wait syz-fuzzer 51418 420749 46820 0 3 0x1e000082 kqread syz-fuzzer 51418 204373 46820 0 3 0x1e000082 wait syz-fuzzer 51418 305174 46820 0 3 0x1e000082 wait syz-fuzzer 51418 266710 46820 0 3 0x1e000082 wait syz-fuzzer 51418 311054 46820 0 3 0x1e000082 thrsleep syz-fuzzer 51418 399069 46820 0 3 0x1e000082 wait syz-fuzzer 51418 332850 46820 0 3 0x1e000082 thrsleep syz-fuzzer 51418 47652 46820 0 3 0x1e000082 wait syz-fuzzer 46820 330177 34272 0 3 0x810008a sigsusp ksh 34272 474263 40880 0 3 0x1800009a kqread sshd 60465 371981 1 0 3 0x18100083 ttyopn getty 40880 105827 1 0 3 0x18000088 kqread sshd 66448 491017 48844 73 3 0x19100090 kqread syslogd 48844 370198 1 0 3 0x18100082 netio syslogd 13920 327726 1 0 3 0x18100080 kqread resolvd 5484 107083 55734 77 3 0x18100092 kqread dhcpleased 28289 104557 55734 77 3 0x18100092 kqread dhcpleased 55734 329025 1 0 3 0x18000080 kqread dhcpleased 60392 219477 0 0 3 0x14200 bored smr 37496 217719 0 0 2 0x14200 zerothread 33177 220033 0 0 3 0x14200 aiodoned aiodoned 7365 4292 0 0 3 0x14200 syncer update 66860 307456 0 0 3 0x14200 cleaner cleaner 33 310175 0 0 2 0x14200 reaper 6251 77677 0 0 3 0x14200 pgdaemon pagedaemon 75763 439907 0 0 3 0x14200 bored viomb 70885 46516 0 0 3 0x40014200 acpi0 acpi0 57185 460519 0 0 3 0x14200 bored softnet3 25279 235367 0 0 3 0x14200 bored softnet2 32181 486192 0 0 3 0x14200 bored softnet1 95147 418782 0 0 3 0x14200 bored softnet0 76016 407607 0 0 3 0x14200 bored systqmp 73536 141049 0 0 3 0x14200 bored systq 7637 441512 0 0 3 0x40014200 tmoslp softclock 30336 492106 0 0 3 0x40014200 idle0 1 82249 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 10172 6408K 7118K 166960K 17668 0 pcb 15 14K 15K 166960K 225 0 rtable 163 9K 12K 166960K 862 0 pf 30 9K 9K 166960K 133 0 ifaddr 32 9K 11K 166960K 134 0 ifgroup 51 2K 2K 166960K 198 0 sysctl 3 0K 0K 166960K 3 0 counters 30 17K 17K 166960K 78 0 ioctlops 0 0K 2K 166960K 266 0 iov 0 0K 18K 166960K 387 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1594 100K 100K 166960K 3906 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 36 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 908 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 14 49K 73K 166960K 3930 0 sigio 0 0K 0K 166960K 116 0 proc 62 75K 75K 166960K 907 0 subproc 104 6K 6K 166960K 234 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 225 0 in_multi 61 4K 7K 166960K 247 0 ether_multi 1 0K 0K 166960K 4 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 906 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 338 136K 138K 166960K 40329 0 UVM aobj 131 4K 4K 166960K 140 0 pinsyscall 22 44K 100K 166960K 1519 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 83 0 NDP 11 0K 2K 166960K 98 0 temp 74 6804K 7440K 166960K 40148 0 kqueue 12 18K 31K 166960K 353 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 120 493 0 490 5 2 3 3 0 8 2 rtentry 112 260 0 190 4 0 4 4 0 8 1 unpcb 144 2437 0 2424 9 5 4 6 0 8 3 syncache 336 45 0 45 2 1 1 1 0 8 1 sackhl 24 3 0 3 1 1 0 1 0 8 0 tcpqe 32 210 0 210 2 1 1 1 0 8 1 tcpcb 808 1381 0 1376 23 14 9 14 0 8 8 arp 88 45 0 35 1 0 1 1 0 8 0 ipq 40 7 0 7 2 1 1 1 0 8 1 ipqe 40 20 0 20 2 1 1 1 0 8 1 inpcb 360 2593 0 2585 22 13 9 13 0 8 8 nd6 104 59 0 46 1 0 1 1 0 8 0 pkpcb 40 8 0 8 1 0 1 1 0 8 1 kcovpl 48 18 0 10 1 0 1 1 0 8 0 ppxss 1072 27 0 27 2 1 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1052 0 745 36 8 28 29 0 8 8 art_table 32 1053 0 745 4 0 4 4 0 8 0 art_node 16 259 0 195 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 1 0 1 0 8 0 semapl 112 906 0 896 1 0 1 1 0 8 0 shmpl 112 137 0 9 4 0 4 4 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 6720 0 5184 97 0 97 97 0 8 0 ffsino 240 6720 0 5184 91 0 91 91 0 8 0 nchpl 144 12287 0 10569 66 0 66 66 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 41018 0 41016 4 2 2 3 0 8 1 vcpupl 2048 41 0 0 6 0 6 6 0 8 0 vmpool 664 45 0 4 4 0 4 4 0 8 0 kstatmem 264 118 0 96 2 0 2 2 0 8 0 scxspl 216 37990 0 37990 9 7 2 8 1 8 2 plimitpl 152 381 0 366 1 0 1 1 0 8 0 sigapl 424 4229 0 4165 8 0 8 8 0 8 0 futexpl 64 36549 0 36546 1 0 1 1 0 8 0 knotepl 120 35701 0 35619 10 0 10 10 0 8 6 kqueuepl 184 740 0 732 9 3 6 6 0 8 5 pipepl 288 629 0 601 9 4 5 7 0 8 2 fdescpl 432 4191 0 4166 4 0 4 4 0 8 0 filepl 120 23708 0 23474 17 3 14 14 0 8 5 lockfpl 104 1096 0 1094 2 1 1 2 0 8 0 lockfspl 48 340 0 338 1 0 1 1 0 8 0 sessionpl 144 33 0 17 1 0 1 1 0 8 0 pgrppl 48 123 0 107 1 0 1 1 0 8 0 ucredpl 104 3533 0 3523 1 0 1 1 0 8 0 zombiepl 144 5754 0 5753 2 1 1 1 0 8 0 processpl 1072 4229 0 4165 5 0 5 5 0 8 0 procpl 680 10816 0 10735 10 1 9 9 0 8 1 sosppl 168 40 0 40 1 0 1 1 0 8 1 sockpl 488 5531 0 5507 69 58 11 23 0 8 8 mcl64k 65536 163 0 163 2 1 1 1 0 8 1 mcl16k 16384 86 0 86 2 1 1 1 0 8 1 mcl12k 12288 176 0 176 2 1 1 1 0 8 1 mcl9k 9216 82 0 82 2 1 1 1 0 8 1 mcl8k 8192 262 0 262 2 1 1 1 0 8 1 mcl4k 4096 636 0 636 5 4 1 4 0 8 1 mcl2k2 2112 28 0 28 2 1 1 1 0 8 1 mcl2k 2048 81762 0 81719 33 20 13 31 0 8 7 mtagpl 96 765 0 645 9 0 9 9 0 8 5 mbufpl 256 158912 0 158704 48 30 18 34 0 8 3 bufpl 280 10483 0 4147 453 0 453 453 0 8 0 anonpl 24 560447 0 546711 119 6 113 113 0 188 20 amapchunkpl 152 128323 0 127544 41 2 39 39 0 158 2 amappl16 200 12656 0 12228 42 9 33 36 0 8 8 amappl15 192 40 0 39 1 0 1 1 0 8 0 amappl14 184 189 0 178 2 1 1 2 0 8 0 amappl13 176 20 0 20 2 1 1 1 0 8 1 amappl12 168 4965 0 4939 2 0 2 2 0 8 0 amappl11 160 52 0 41 1 0 1 1 0 8 0 amappl10 152 123 0 110 1 0 1 1 0 8 0 amappl9 144 210 0 209 1 0 1 1 0 8 0 amappl8 136 286 0 217 3 0 3 3 0 8 0 amappl7 128 66 0 54 1 0 1 1 0 8 0 amappl6 120 489 0 469 2 0 2 2 0 8 0 amappl5 112 289 0 276 1 0 1 1 0 8 0 amappl4 104 667 0 631 2 0 2 2 0 8 0 amappl3 96 25447 0 25381 3 0 3 3 0 8 0 amappl2 88 4777 0 4707 4 1 3 4 0 8 0 amappl1 80 23427 0 22943 22 11 11 22 0 8 0 amappl 88 39605 0 39399 6 0 6 6 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 72 139 0 9 3 0 3 3 0 8 0 uaddrrnd 24 4236 0 4169 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4236 0 4169 1 0 1 1 0 8 0 vmmpekpl 168 34676 0 34606 4 0 4 4 0 8 0 vmmpepl 168 275538 0 273393 179 49 130 153 0 357 21 vmsppl 352 4235 0 4169 7 0 7 7 0 8 0 rwobjpl 24 77404 0 69930 47 0 47 47 0 8 0 pdppl 4096 8478 0 8379 352 247 105 107 0 8 6 pvpl 32 1399769 0 1380674 422 223 199 389 0 265 29 pmappl 216 4235 0 4169 4 0 4 4 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 729 0 336 12 0 12 12 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(ffff8000ffff5510) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188 exit1(ffff80002c10f7f8,0,0,1) at exit1+0x3d6 sys/kern/kern_exit.c:218 sys_exit(ffff80002c10f7f8,ffff800037819d10,ffff800037819c60) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800037819d10) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c4e9d7b6590, 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(ffff8000ffff5510) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188 exit1(ffff80002c10f7f8,0,0,1) at exit1+0x3d6 sys/kern/kern_exit.c:218 sys_exit(ffff80002c10f7f8,ffff800037819d10,ffff800037819c60) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800037819d10) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c4e9d7b6590, count: -8