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(ffffffff82927e9a) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828de7eb,ffffffff828b1327,bc,ffffffff82864e4f) at __assert+0x29 sys/kern/subr_prf.c:157 unveil_destroy(ffff80002a65fab0) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188 exit1(ffff80002a6e2ac0,0,0,1) at exit1+0x3d6 sys/kern/kern_exit.c:218 sys_exit(ffff80002a6e2ac0,ffff8000341b5e60,ffff8000341b5db0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000341b5e60) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73cd48ee11c0, 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(ffffffff82927e9a) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828de7eb,ffffffff828b1327,bc,ffffffff82864e4f) at __assert+0x29 sys/kern/subr_prf.c:157 unveil_destroy(ffff80002a65fab0) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188 exit1(ffff80002a6e2ac0,0,0,1) at exit1+0x3d6 sys/kern/kern_exit.c:218 sys_exit(ffff80002a6e2ac0,ffff8000341b5e60,ffff8000341b5db0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000341b5e60) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73cd48ee11c0, count: -8 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000341b5bb0 rbx 0xffff80002a65fab0 rdx 0 rcx 0 rax 0xffff80002a6e2ac0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x73c394843bebdea2 r11 0x3bd2d56e938c3779 r12 0 r13 0x2 r14 0 r15 0x1 rip 0xffffffff82337ebc db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff8000341b5ba0 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb> show proc PROC (syz-executor.6) tid=270026 pid=73154 tcnt=1 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a6e2ac0 forw=0xffffffffffffffff, list=0xffff80002a6e22c8,0xffff80002a6e2580 process=0xffff80002a65fab0 user=0xffff8000341b0000, vmspace=0xfffffd806978fb10 estcpu=36, cpticks=64, pctcpu=0.1, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 124 383313 99623 0 2 0 syz-executor.4 9885 466255 52812 0 2 0 syz-executor.2 9885 457855 52812 0 2 0x4000000 syz-executor.2 75607 173975 78744 0 2 0x2 syz-executor.7 61457 325719 78744 0 2 0x2 syz-executor.5 93504 19230 78744 0 2 0x2 syz-executor.0 78880 367697 78744 0 3 0x82 nanoslp syz-executor.6 47803 301990 0 0 3 0x14280 nfsidl nfsio 11019 271073 0 0 3 0x14280 nfsidl nfsio 8356 229832 0 0 3 0x14280 nfsidl nfsio 96870 284405 0 0 3 0x14280 nfsidl nfsio 48805 44352 0 0 3 0x14280 nfsidl nfsio 28776 140080 0 0 3 0x14280 nfsidl nfsio 31188 2739 0 0 3 0x14280 nfsidl nfsio 19605 137543 0 0 3 0x14280 nfsidl nfsio 46052 494753 0 0 3 0x14280 nfsidl nfsio 62686 273116 0 0 3 0x14280 nfsidl nfsio 63210 308388 0 0 3 0x14280 nfsidl nfsio 82523 107474 0 0 3 0x14280 nfsidl nfsio 91588 194580 0 0 3 0x14280 nfsidl nfsio 90821 13081 0 0 3 0x14280 nfsidl nfsio 99346 228106 0 0 3 0x14280 nfsidl nfsio 47110 36437 0 0 3 0x14280 nfsidl nfsio 67589 366090 0 0 3 0x14280 nfsidl nfsio 27963 407394 0 0 3 0x14280 nfsidl nfsio 30734 158195 0 0 3 0x14280 nfsidl nfsio 27270 151100 0 0 3 0x14280 nfsidl nfsio 52812 149535 78744 0 3 0x82 nanoslp syz-executor.2 76135 344039 1 0 3 0x18100083 ttyin getty 56693 269305 78744 0 2 0x2 syz-executor.3 44291 386494 78744 0 2 0x2 syz-executor.1 99623 6196 78744 0 3 0x82 nanoslp syz-executor.4 91287 386864 0 0 3 0x14200 bored sosplice 78744 129222 37680 0 3 0x1a000082 wait syz-fuzzer 78744 406630 37680 0 3 0x1e000082 thrsleep syz-fuzzer 78744 504870 37680 0 3 0x1e000082 wait syz-fuzzer 78744 344048 37680 0 3 0x1e000082 thrsleep syz-fuzzer 78744 195932 37680 0 3 0x1e000082 wait syz-fuzzer 78744 88123 37680 0 3 0x1e000082 thrsleep syz-fuzzer 78744 166190 37680 0 3 0x1e000082 wait syz-fuzzer 78744 111499 37680 0 3 0x1e000082 wait syz-fuzzer 78744 56970 37680 0 3 0x1e000082 wait syz-fuzzer 78744 33838 37680 0 3 0x1e000082 thrsleep syz-fuzzer 78744 454363 37680 0 3 0x1e000082 wait syz-fuzzer 78744 494535 37680 0 3 0x1e000082 wait syz-fuzzer 78744 492097 37680 0 3 0x1e000082 kqread syz-fuzzer 78744 434345 37680 0 3 0x1e000082 thrsleep syz-fuzzer 37680 436408 33294 0 3 0x810008a sigsusp ksh 33294 289928 40372 0 3 0x1800009a kqread sshd 40372 329177 1 0 3 0x18000088 kqread sshd 3017 189230 23348 73 3 0x19100090 kqread syslogd 23348 72910 1 0 3 0x18100082 netio syslogd 83769 482856 1 0 3 0x18100080 kqread resolvd 1835 257466 59891 77 3 0x18100092 kqread dhcpleased 68496 445750 59891 77 3 0x18100092 kqread dhcpleased 59891 368927 1 0 3 0x18000080 kqread dhcpleased 48417 518075 0 0 3 0x14200 bored smr 48694 309357 0 0 2 0x14200 zerothread 59792 397180 0 0 3 0x14200 aiodoned aiodoned 936 349019 0 0 3 0x14200 syncer update 49665 261531 0 0 3 0x14200 cleaner cleaner 69167 147901 0 0 3 0x14200 reaper reaper 47013 289215 0 0 3 0x14200 pgdaemon pagedaemon 97790 357222 0 0 3 0x14200 bored viomb 29625 253679 0 0 3 0x40014200 acpi0 acpi0 62825 420494 0 0 3 0x14200 bored softnet3 52844 144255 0 0 3 0x14200 bored softnet2 26999 361297 0 0 3 0x14200 bored softnet1 47421 489431 0 0 3 0x14200 bored softnet0 41958 396794 0 0 3 0x14200 bored systqmp 470 474838 0 0 3 0x14200 bored systq 11959 507771 0 0 2 0x40014200 softclock 78938 113819 0 0 3 0x40014200 idle0 1 430433 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 10209 6430K 7061K 166960K 28641 0 pcb 15 18K 20K 166960K 759 0 rtable 210 6K 7K 166960K 2105 0 pf 31 9K 9K 166960K 356 0 ifaddr 41 12K 12K 166960K 303 0 ifgroup 54 2K 2K 166960K 601 0 sysctl 3 0K 0K 166960K 5 0 counters 31 17K 17K 166960K 157 0 ioctlops 0 0K 2K 166960K 698 0 iov 0 0K 32K 166960K 1014 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1454 91K 92K 166960K 7050 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 76 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 1548 0 dirhash 12 2K 3K 166960K 72 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 16 57K 73K 166960K 9815 0 sigio 0 0K 0K 166960K 786 0 proc 62 75K 83K 166960K 2168 0 subproc 104 6K 6K 166960K 585 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 821 0 in_multi 87 6K 7K 166960K 596 0 ether_multi 1 0K 0K 166960K 12 0 mrt 4 0K 0K 166960K 16 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 259 1155K 1155K 166960K 259 0 exec 0 0K 1K 166960K 2407 0 pfkey data 0 0K 0K 166960K 9 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 413 386K 391K 166960K 92253 0 UVM aobj 131 4K 4K 166960K 134 0 pinsyscall 22 44K 100K 166960K 2457 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 404 0 NDP 12 0K 2K 166960K 231 0 temp 74 6804K 7440K 166960K 63449 0 kqueue 12 18K 26K 166960K 718 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 120 819 0 816 5 4 1 5 0 8 0 rtentry 112 614 0 519 4 1 3 4 0 8 0 unpcb 144 6443 0 6430 11 5 6 6 0 8 5 syncache 336 99 0 99 3 2 1 1 0 8 1 sackhl 24 4 0 4 1 1 0 1 0 8 0 tcpqe 32 127 843 127 1 1 0 1 0 8 0 tcpcb 808 2928 0 2852 26 12 14 17 0 8 6 arp 88 104 0 90 1 0 1 1 0 8 0 ipq 40 15 0 15 1 0 1 1 0 8 1 ipqe 40 56 0 56 1 0 1 1 0 8 1 inpcb 360 8303 0 8227 52 38 14 18 0 8 6 nd6 104 139 0 118 1 0 1 1 0 8 0 pkpcb 40 87 0 87 2 1 1 1 0 8 1 kcovpl 48 45 0 37 1 0 1 1 0 8 0 ppxss 1072 15 0 15 2 2 0 1 0 8 0 art_heap8 4096 4 0 3 3 2 1 3 0 8 0 art_heap4 256 2286 0 1870 40 13 27 30 0 8 0 art_table 32 2290 0 1873 4 0 4 4 0 8 0 art_node 16 570 0 484 1 0 1 1 0 8 0 sysvmsgpl 40 41 0 1 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 1546 0 1536 1 0 1 1 0 8 0 shmpl 112 131 0 3 4 0 4 4 0 8 0 dirhash 1024 57 0 40 3 0 3 3 0 8 0 dino2pl 256 14512 0 12960 98 0 98 98 0 8 0 ffsino 240 14512 0 12960 92 0 92 92 0 8 0 nchpl 144 27688 0 25962 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 95167 0 95166 6 4 2 3 0 8 1 vcpupl 2048 111 0 0 14 0 14 14 0 8 0 vmpool 664 143 0 32 10 0 10 10 0 8 0 kstatmem 264 276 0 252 2 0 2 2 0 8 0 scxspl 216 81608 0 81608 11 10 1 8 1 8 1 plimitpl 152 1380 0 1365 1 0 1 1 0 8 0 sigapl 424 10381 0 10316 8 0 8 8 0 8 0 futexpl 64 90284 0 90284 2 1 1 1 0 8 1 knotepl 120 91103 0 91021 11 7 4 11 0 8 0 kqueuepl 184 2145 0 2137 11 8 3 9 0 8 2 pipepl 288 2408 0 2380 11 8 3 11 0 8 0 fdescpl 432 10022 0 9995 4 0 4 4 0 8 0 filepl 120 59861 0 59627 26 14 12 18 0 8 4 lockfpl 104 2803 0 2801 3 1 2 2 0 8 1 lockfspl 48 1013 0 1011 1 0 1 1 0 8 0 sessionpl 144 65 0 49 1 0 1 1 0 8 0 pgrppl 48 325 0 309 1 0 1 1 0 8 0 ucredpl 104 9076 0 9059 1 0 1 1 0 8 0 zombiepl 144 10976 0 10975 2 1 1 1 0 8 0 processpl 1072 10381 0 10316 5 0 5 5 0 8 0 procpl 680 25078 0 24999 11 2 9 9 0 8 0 sosppl 168 112 0 94 2 1 1 1 0 8 0 sockpl 488 15727 0 15635 235 214 21 37 0 8 8 mcl64k 65536 396 0 396 3 2 1 1 0 8 1 mcl16k 16384 227 0 227 3 2 1 1 0 8 1 mcl12k 12288 429 0 429 3 2 1 1 0 8 1 mcl9k 9216 182 0 182 3 2 1 1 0 8 1 mcl8k 8192 719 0 719 2 1 1 1 0 8 1 mcl4k 4096 1024 0 1024 6 5 1 4 0 8 1 mcl2k2 2112 57 0 57 3 2 1 1 0 8 1 mcl2k 2048 91120 0 91051 59 48 11 49 0 8 1 mtagpl 96 1469 0 1348 12 8 4 12 0 8 0 mbufpl 256 226365 0 225929 136 92 44 75 0 8 0 bufpl 280 21294 0 14951 454 0 454 454 0 8 0 anonpl 24 992607 0 979234 112 17 95 112 0 188 0 amapchunkpl 152 307228 0 306464 53 16 37 50 0 158 1 amappl16 200 19004 0 18564 47 20 27 36 0 8 2 amappl15 192 69 0 66 1 0 1 1 0 8 0 amappl14 184 270 0 257 2 1 1 2 0 8 0 amappl13 176 22 0 22 2 2 0 1 0 8 0 amappl12 168 11195 0 11170 2 0 2 2 0 8 0 amappl11 160 52 0 42 1 0 1 1 0 8 0 amappl10 152 94 0 86 1 0 1 1 0 8 0 amappl9 144 259 0 259 2 1 1 1 0 8 1 amappl8 136 438 0 356 3 0 3 3 0 8 0 amappl7 128 81 0 67 1 0 1 1 0 8 0 amappl6 120 863 0 840 2 1 1 2 0 8 0 amappl5 112 478 0 465 1 0 1 1 0 8 0 amappl4 104 955 0 918 3 1 2 2 0 8 0 amappl3 96 57550 0 57478 3 0 3 3 0 8 0 amappl2 88 10906 0 10835 4 1 3 4 0 8 0 amappl1 80 46139 0 45644 23 12 11 22 0 8 0 amappl 88 91082 0 90857 7 0 7 7 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 72 133 0 3 3 0 3 3 0 8 0 uaddrrnd 24 10165 0 10026 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 10165 0 10026 1 0 1 1 0 8 0 vmmpekpl 168 74920 0 74835 4 0 4 4 0 8 0 vmmpepl 168 609707 0 607420 172 40 132 136 0 357 11 vmsppl 352 10164 0 10026 13 0 13 13 0 8 0 rwobjpl 24 146850 0 139320 48 1 47 48 0 8 0 pdppl 4096 20336 0 20163 610 435 175 177 0 8 2 pvpl 32 2732011 0 2713309 430 258 172 389 0 265 0 pmappl 216 10164 0 10026 8 0 8 8 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1129 0 630 16 0 16 16 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(ffffffff82927e9a) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828de7eb,ffffffff828b1327,bc,ffffffff82864e4f) at __assert+0x29 sys/kern/subr_prf.c:157 unveil_destroy(ffff80002a65fab0) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188 exit1(ffff80002a6e2ac0,0,0,1) at exit1+0x3d6 sys/kern/kern_exit.c:218 sys_exit(ffff80002a6e2ac0,ffff8000341b5e60,ffff8000341b5db0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000341b5e60) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73cd48ee11c0, 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(ffffffff82927e9a) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828de7eb,ffffffff828b1327,bc,ffffffff82864e4f) at __assert+0x29 sys/kern/subr_prf.c:157 unveil_destroy(ffff80002a65fab0) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188 exit1(ffff80002a6e2ac0,0,0,1) at exit1+0x3d6 sys/kern/kern_exit.c:218 sys_exit(ffff80002a6e2ac0,ffff8000341b5e60,ffff8000341b5db0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff8000341b5e60) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73cd48ee11c0, count: -8