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+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(ffffffff833ff54a) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833b1752,ffffffff8337adec,bc,ffffffff83323f6a) at __assert+0x29 unveil_destroy(ffff80002a7c6f90) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80002a832030,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80002a832030,ffff80003ca43570,ffff80003ca434c0) at sys_exit+0x1a syscall(ffff80003ca43570) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x743a5da02100, 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+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff833ff54a) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833b1752,ffffffff8337adec,bc,ffffffff83323f6a) at __assert+0x29 unveil_destroy(ffff80002a7c6f90) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80002a832030,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80002a832030,ffff80003ca43570,ffff80003ca434c0) at sys_exit+0x1a syscall(ffff80003ca43570) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x743a5da02100, count: -8 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80003ca432c0 rbx 0xffff80002a7c6f90 rdx 0 rcx 0 rax 0xffff80002a832030 r8 0 r9 0x8080808080808080 r10 0xfa112708046a1186 r11 0xaabb392382163c01 r12 0 r13 0x2 r14 0 r15 0x1 rip 0xffffffff81725795 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003ca432b0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=460180 pid=21370 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a832030 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a7e0530,0xffffffff839299c0 process=0xffff80002a7c6f90 user=0xffff80003ca3e000, vmspace=0xfffffd806c0ae448 estcpu=36, cpticks=44, pctcpu=0.1, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 27508 395693 82369 0 3 0x82 piperd syz-executor 5865 384232 0 0 3 0x14280 nfsidl nfsio 98154 15811 0 0 3 0x14280 nfsidl nfsio 12343 430732 0 0 3 0x14280 nfsidl nfsio 95652 193448 0 0 3 0x14280 nfsidl nfsio 46400 296546 0 0 3 0x14280 nfsidl nfsio 21263 325537 0 0 3 0x14280 nfsidl nfsio 51117 485565 0 0 3 0x14280 nfsidl nfsio 6059 173230 0 0 3 0x14280 nfsidl nfsio 91149 28750 0 0 3 0x14280 nfsidl nfsio 48259 213687 0 0 3 0x14280 nfsidl nfsio 78832 91097 0 0 3 0x14280 nfsidl nfsio 7901 150073 0 0 3 0x14280 nfsidl nfsio 55653 345784 0 0 3 0x14280 nfsidl nfsio 97814 327826 0 0 3 0x14280 nfsidl nfsio 56345 97840 0 0 3 0x14280 nfsidl nfsio 19858 300710 0 0 3 0x14280 nfsidl nfsio 84619 164074 0 0 3 0x14280 nfsidl nfsio 60232 309552 0 0 3 0x14280 nfsidl nfsio 76442 77522 0 0 3 0x14280 nfsidl nfsio 81004 39955 0 0 3 0x14280 nfsidl nfsio 15877 372281 82369 0 3 0x82 piperd syz-executor 26062 491448 0 0 3 0x14200 bored sosplice 26902 310735 82369 0 3 0x82 piperd syz-executor 4990 351222 82369 0 3 0x82 piperd syz-executor 65863 188534 82369 0 3 0x82 piperd syz-executor 8442 53989 82369 0 3 0x82 piperd syz-executor 8436 108558 82369 0 2 0x482 syz-executor 82369 497916 769 0 3 0x82 nanoslp syz-executor 769 132000 55472 0 3 0x10008a sigsusp ksh 55472 451210 79332 0 3 0x98 kqread sshd-session 79332 409588 46036 0 3 0x92 kqread sshd-session 81455 168161 1 0 3 0x100083 ttyin getty 46036 164460 1 0 3 0x88 kqread sshd 31669 165685 14407 73 3 0x1100090 kqread syslogd 14407 122354 1 0 3 0x100082 sbwait syslogd 93796 71554 1 0 3 0x100080 kqread resolvd 11857 498574 85377 77 3 0x100092 kqread dhcpleased 62028 142883 85377 77 3 0x100092 kqread dhcpleased 85377 28719 1 0 3 0x80 kqread dhcpleased 13623 370700 0 0 3 0x14200 bored smr 78597 313546 0 0 2 0x14200 zerothread 13070 450957 0 0 3 0x14200 aiodoned aiodoned 27546 175612 0 0 3 0x14200 syncer update 33546 154141 0 0 3 0x14200 cleaner cleaner 50933 154618 0 0 2 0x14200 reaper 26227 12973 0 0 3 0x14200 pgdaemon pagedaemon 90535 106981 0 0 3 0x14200 bored viomb 57346 352303 0 0 3 0x40014200 acpi0 acpi0 33354 127545 0 0 3 0x14200 bored softnet3 65409 35896 0 0 3 0x14200 bored softnet2 38766 294357 0 0 3 0x14200 bored softnet1 55714 280300 0 0 3 0x14200 bored softnet0 64619 366992 0 0 3 0x14200 bored systqmp 68093 358125 0 0 3 0x14200 bored systq 19860 447514 0 0 2 0x40014200 softclock 95971 91026 0 0 3 0x40014200 idle0 1 205892 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 10204 11055K 11443K 166960K 13346 0 pcb 17 15K 16K 166960K 323 0 rtable 178 7K 9K 166960K 1315 0 pf 30 12K 14K 166960K 189 0 ifaddr 35 6K 8K 166960K 196 0 ifgroup 50 2K 2K 166960K 276 0 sysctl 4 1K 1K 166960K 6 0 counters 30 17K 18K 166960K 109 0 ioctlops 0 0K 4K 166960K 227 0 iov 0 0K 20K 166960K 145 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1463 92K 92K 166960K 2657 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 2K 9K 166960K 26 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 59 0 dirhash 12 2K 3K 166960K 33 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 9 29K 89K 166960K 1694 0 sigio 0 0K 0K 166960K 42 0 proc 64 75K 91K 166960K 1200 0 subproc 63 3K 4K 166960K 261 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 332 0 in_multi 69 5K 7K 166960K 398 0 ether_multi 1 0K 0K 166960K 6 0 mrt 1 0K 0K 166960K 3 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 1036 0 fusefs mount 1 32K 32K 166960K 1 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 167 63K 89K 166960K 15672 0 UVM aobj 33 2K 4K 166960K 39 0 pinsyscall 31 62K 92K 166960K 3267 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 92 0 NDP 11 0K 2K 166960K 138 0 temp 80 8636K 8804K 166960K 62275 0 kqueue 13 20K 30K 166960K 246 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 120 275 0 272 3 2 1 3 0 8 0 rtentry 112 405 0 330 4 0 4 4 0 8 0 unpcb 144 1665 0 1650 9 8 1 6 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 808 360 0 355 5 4 1 4 0 8 0 arp 88 70 0 56 1 0 1 1 0 8 0 ipq 40 2 0 2 1 1 0 1 0 8 0 ipqe 40 6 0 6 1 1 0 1 0 8 0 inpcb 344 1945 0 1936 21 19 2 16 0 8 1 nd6 104 93 0 76 1 0 1 1 0 8 0 pkpcb 40 11 0 11 2 2 0 1 0 8 0 kcovpl 48 29 0 22 1 0 1 1 0 8 0 ppxss 1072 41 0 41 2 2 0 1 0 8 0 pppxif 1376 9 0 9 2 2 0 1 0 8 0 pfrule 1344 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 3 0 1 3 1 2 3 0 8 0 art_heap4 256 1653 0 1358 30 8 22 29 0 8 0 art_table 32 1656 0 1359 4 0 4 4 0 8 0 art_node 16 398 0 337 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 10 1 0 1 1 0 8 0 semapl 112 55 0 45 1 0 1 1 0 8 0 shmpl 112 36 0 6 1 0 1 1 0 8 0 dirhash 1024 31 0 14 3 0 3 3 0 8 0 dino2pl 256 4002 0 2471 97 0 97 97 0 8 0 ffsino 248 4002 0 2471 97 0 97 97 0 8 0 nchpl 144 5997 0 4267 65 0 65 65 0 8 0 rtmask 32 2 0 2 1 1 0 1 0 8 0 uvmvnodes 80 4870 0 0 100 0 100 100 0 8 0 vnodes 216 4870 0 0 271 0 271 271 0 8 0 namei 1024 23239 0 23239 3 2 1 2 0 8 1 kstatmem 264 154 0 132 4 2 2 3 0 8 0 scsiplug 72 7 0 7 1 1 0 1 0 8 0 scxspl 216 18796 0 18796 9 8 1 8 1 8 1 plimitpl 152 325 0 310 1 0 1 1 0 8 0 sigapl 424 1953 0 1894 8 0 8 8 0 8 0 futexpl 64 21070 0 21070 1 0 1 1 0 8 1 knotepl 120 426330 0 426283 26 17 9 16 0 8 3 kqueuepl 184 438 0 429 5 4 1 3 0 8 0 pipepl 296 495 0 468 8 5 3 8 0 8 0 fdescpl 440 1914 0 1893 5 1 4 5 0 8 0 filepl 120 13075 0 12885 19 11 8 16 0 8 0 lockfpl 104 671 0 669 2 1 1 2 0 8 0 lockfspl 48 245 0 243 1 0 1 1 0 8 0 sessionpl 144 43 0 35 1 0 1 1 0 8 0 pgrppl 48 130 0 115 1 0 1 1 0 8 0 ucredpl 104 2318 0 2307 1 0 1 1 0 8 0 zombiepl 144 1910 0 1909 4 3 1 1 0 8 0 processpl 1104 1953 0 1894 5 0 5 5 0 8 0 procpl 656 3849 0 3789 8 1 7 8 0 8 0 sosppl 168 9 0 9 2 2 0 1 0 8 0 sockpl 528 3925 0 3899 28 25 3 22 0 8 0 mcl64k 65536 158 0 158 3 2 1 1 0 8 1 mcl16k 16384 1 0 1 1 1 0 1 0 8 0 mcl8k 8192 26 0 26 2 2 0 1 0 8 0 mcl4k 4096 4169 0 4116 13 6 7 12 0 8 0 mcl2k 2048 1960 0 1959 5 4 1 3 0 8 0 mtagpl 96 110 0 23 3 0 3 3 0 8 0 mbufpl 256 23212 0 22984 87 68 19 77 0 8 0 bufpl 280 4915 0 147 341 0 341 341 0 8 0 anonpl 24 258549 0 249145 97 11 86 97 0 187 0 amapchunkpl 152 51152 0 50738 44 20 24 38 0 158 1 amappl16 200 5324 0 4989 49 19 30 32 0 8 0 amappl15 192 11 0 11 1 1 0 1 0 8 0 amappl14 184 159 0 149 1 0 1 1 0 8 0 amappl13 176 9 0 7 1 0 1 1 0 8 0 amappl12 168 2923 0 2900 2 0 2 2 0 8 0 amappl11 160 44 0 34 1 0 1 1 0 8 0 amappl10 152 6 0 5 1 0 1 1 0 8 0 amappl9 144 273 0 273 1 1 0 1 0 8 0 amappl8 136 22 0 20 1 0 1 1 0 8 0 amappl7 128 143 0 132 1 0 1 1 0 8 0 amappl6 120 389 0 385 1 0 1 1 0 8 0 amappl5 112 194 0 187 1 0 1 1 0 8 0 amappl4 104 350 0 334 1 0 1 1 0 8 0 amappl3 96 10166 0 10094 4 0 4 4 0 8 0 amappl2 88 940 0 882 2 0 2 2 0 8 0 amappl1 80 13697 0 13195 13 1 12 13 0 8 0 amappl 88 15075 0 14954 5 0 5 5 0 92 0 dma8192 8192 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 7 0 7 1 1 0 1 0 8 0 dma128 128 256 0 256 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 38 0 6 1 0 1 1 0 8 0 uaddrrnd 24 1914 0 1892 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1914 0 1892 1 0 1 1 0 8 0 vmmpekpl 168 16143 0 16098 3 0 3 3 0 8 0 vmmpepl 168 128447 0 126722 120 22 98 116 0 357 0 vmsppl 360 1913 0 1892 4 1 3 4 0 8 0 rwobjpl 32 37297 0 31284 51 1 50 51 0 8 0 pdppl 4096 3835 0 3784 133 64 69 79 0 8 18 pvpl 32 789437 0 775613 196 50 146 176 0 265 1 pmappl 216 1913 0 1892 2 0 2 2 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 390 0 166 9 0 9 9 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(ffffffff833ff54a) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833b1752,ffffffff8337adec,bc,ffffffff83323f6a) at __assert+0x29 unveil_destroy(ffff80002a7c6f90) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80002a832030,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80002a832030,ffff80003ca43570,ffff80003ca434c0) at sys_exit+0x1a syscall(ffff80003ca43570) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x743a5da02100, 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(ffffffff833ff54a) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833b1752,ffffffff8337adec,bc,ffffffff83323f6a) at __assert+0x29 unveil_destroy(ffff80002a7c6f90) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80002a832030,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80002a832030,ffff80003ca43570,ffff80003ca434c0) at sys_exit+0x1a syscall(ffff80003ca43570) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x743a5da02100, count: -8