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(ffffffff83401a9c) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833b289a,ffffffff8337e115,bc,ffffffff83327483) at __assert+0x29 unveil_destroy(ffff8000ffff4d08) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80003c981c58,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80003c981c58,ffff80003391fa10,ffff80003391f960) at sys_exit+0x1a syscall(ffff80003391fa10) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74323ebe21d0, 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(ffffffff83401a9c) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833b289a,ffffffff8337e115,bc,ffffffff83327483) at __assert+0x29 unveil_destroy(ffff8000ffff4d08) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80003c981c58,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80003c981c58,ffff80003391fa10,ffff80003391f960) at sys_exit+0x1a syscall(ffff80003391fa10) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74323ebe21d0, count: -8 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80003391f760 rbx 0xffff8000ffff4d08 rdx 0 rcx 0 rax 0xffff80003c981c58 r8 0 r9 0x8080808080808080 r10 0xadb2995eedee26a7 r11 0xeeb73813115d833e r12 0 r13 0x2 r14 0 r15 0x1 rip 0xffffffff827a7515 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003391f750 ss 0 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=505213 pid=23328 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=84, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c981c58 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c980f88,0xffff80002a7bd9c8 process=0xffff8000ffff4d08 user=0xffff80003391a000, vmspace=0xfffffd806c0bb2e0 estcpu=34, cpticks=13, pctcpu=0.9, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 23522 196402 16171 0 2 0 syz-executor 23522 261623 16171 0 3 0x4000080 fsleep syz-executor 19998 361657 28173 0 2 0 syz-executor 19998 116913 28173 0 3 0x4000080 fsleep syz-executor 19998 14638 28173 0 3 0x4000080 fsleep syz-executor 90582 518987 618 0 2 0 syz-executor 90582 294635 618 0 2 0x4000000 syz-executor 90582 310664 618 0 3 0x4000000 inode syz-executor 94511 350629 61292 0 2 0 syz-executor 94511 448245 61292 0 3 0x4000080 fsleep syz-executor 94511 252861 61292 0 3 0x4000080 fsleep syz-executor 50573 101359 68348 0 2 0x10 syz-executor 50573 138125 68348 0 3 0x4000090 fsleep syz-executor 16127 433810 34314 0 3 0 vmmaplk syz-executor 16127 165890 34314 0 3 0x4000080 kqpoll syz-executor 16127 132303 34314 0 2 0x4000000 syz-executor 16127 492260 34314 0 2 0x4000000 syz-executor 27469 494471 92973 60928 2 0x10 syz-executor 27469 504122 92973 60928 3 0x4000090 fsleep syz-executor 27469 112993 92973 60928 3 0x4000090 fsleep syz-executor 27469 334655 92973 60928 3 0x4000090 fsleep syz-executor 618 19701 69336 0 3 0x82 nanoslp syz-executor 23556 65838 0 0 3 0x14200 bored sosplice 68348 385581 69336 0 2 0x482 syz-executor 34314 432170 69336 0 2 0x482 syz-executor 18372 420831 69336 0 3 0x82 nanoslp syz-executor 61292 126481 69336 0 2 0x482 syz-executor 28173 372865 69336 0 2 0x482 syz-executor 92973 31333 69336 0 3 0x82 nanoslp syz-executor 16171 114321 69336 0 3 0x82 nanoslp syz-executor 69336 120940 87863 0 3 0x82 kqread syz-executor 87863 245316 1126 0 3 0x10008a sigsusp ksh 1126 111509 16220 0 3 0x98 kqread sshd-session 16220 48853 80882 0 3 0x92 kqread sshd-session 53003 140899 1 0 3 0x100083 ttyin getty 80882 182666 1 0 3 0x88 kqread sshd 55335 456839 62178 73 3 0x1100090 kqread syslogd 62178 68862 1 0 3 0x100082 sbwait syslogd 9434 426817 1 0 3 0x100080 kqread resolvd 59025 445890 43985 77 3 0x100092 kqread dhcpleased 74894 340083 43985 77 3 0x100092 kqread dhcpleased 43985 214872 1 0 3 0x80 kqread dhcpleased 69424 323602 0 0 3 0x14200 bored smr 65289 478743 0 0 2 0x14200 zerothread 29704 426836 0 0 3 0x14200 aiodoned aiodoned 16583 164401 0 0 3 0x14200 syncer update 77984 166818 0 0 3 0x14200 cleaner cleaner 14356 492221 0 0 3 0x14200 reaper reaper 62122 339827 0 0 3 0x14200 pgdaemon pagedaemon 8655 474897 0 0 3 0x14200 bored viomb 96736 2147 0 0 3 0x40014200 acpi0 acpi0 81241 323497 0 0 3 0x14200 bored softnet3 17395 488877 0 0 3 0x14200 bored softnet2 94612 488225 0 0 3 0x14200 bored softnet1 613 383692 0 0 3 0x14200 bored softnet0 73970 201141 0 0 3 0x14200 bored systqmp 47883 377310 0 0 3 0x14200 bored systq 58749 522749 0 0 2 0x40014200 softclock 74528 220514 0 0 3 0x40014200 idle0 1 282589 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 10172 11039K 11240K 166960K 11456 0 pcb 17 13K 14K 166960K 95 0 rtable 195 6K 7K 166960K 709 0 pf 28 12K 20K 166960K 36 0 ifaddr 38 6K 7K 166960K 53 0 ifgroup 46 2K 2K 166960K 59 0 sysctl 1 1K 1K 166960K 1 0 counters 29 17K 17K 166960K 33 0 ioctlops 0 0K 4K 166960K 75 0 iov 0 0K 16K 166960K 16 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1396 88K 88K 166960K 1584 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 6 0K 0K 166960K 7 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 97K 166960K 295 0 sigio 0 0K 0K 166960K 5 0 proc 64 75K 124K 166960K 531 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 9 0 in_multi 89 6K 7K 166960K 124 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 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 442 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 235 72K 81K 166960K 4098 0 UVM aobj 12 2K 2K 166960K 12 0 pinsyscall 39 78K 96K 166960K 1353 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 6 0 NDP 10 0K 1K 166960K 32 0 temp 44 8631K 8699K 166960K 6416 0 kqueue 13 20K 28K 166960K 44 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 86 0 83 2 1 1 2 0 8 0 rtentry 112 258 0 170 3 0 3 3 0 8 0 unpcb 144 107 0 92 1 0 1 1 0 8 0 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 808 36 0 32 1 0 1 1 0 8 0 arp 88 53 0 37 1 0 1 1 0 8 0 inpcb 344 266 0 257 7 5 2 7 0 8 0 nd6 104 27 0 6 1 0 1 1 0 8 0 pkpcb 40 67 0 67 2 1 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1072 1 0 1 1 1 0 1 0 8 0 pppxif 1376 1 0 1 1 1 0 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfrule 1344 3 0 3 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 585 0 219 28 0 28 28 0 8 1 art_table 32 586 0 219 4 0 4 4 0 8 0 art_node 16 224 0 145 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 5 1 0 1 1 0 8 1 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 4 0 0 1 0 1 1 0 8 0 shmpl 112 9 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1791 0 293 94 0 94 94 0 8 0 ffsino 248 1791 0 293 94 0 94 94 0 8 0 nchpl 144 2199 0 519 63 0 63 63 0 8 0 uvmvnodes 80 2073 0 0 43 0 43 43 0 8 0 vnodes 216 2073 0 0 116 0 116 116 0 8 0 namei 1024 7411 0 7409 2 1 1 2 0 8 0 kstatmem 264 26 0 6 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 7270 0 7270 10 7 3 8 1 8 3 plimitpl 152 273 0 256 1 0 1 1 0 8 0 sigapl 424 574 0 527 7 0 7 7 0 8 0 futexpl 64 2380 0 2371 1 0 1 1 0 8 0 knotepl 120 8838 0 8791 17 7 10 17 0 8 8 kqueuepl 184 60 0 50 1 0 1 1 0 8 0 pipepl 296 120 0 93 3 0 3 3 0 8 0 fdescpl 440 557 0 528 5 0 5 5 0 8 0 filepl 120 2830 0 2617 15 5 10 15 0 8 2 lockfpl 104 46 0 44 1 0 1 1 0 8 0 lockfspl 48 19 0 17 1 0 1 1 0 8 0 sessionpl 144 22 0 14 1 0 1 1 0 8 0 pgrppl 48 37 0 21 1 0 1 1 0 8 0 ucredpl 104 272 0 258 1 0 1 1 0 8 0 zombiepl 144 609 0 608 1 0 1 1 0 8 0 processpl 1104 574 0 527 4 0 4 4 0 8 0 procpl 656 843 0 782 6 0 6 6 0 8 0 sosppl 168 2 0 2 1 0 1 1 0 8 1 sockpl 528 530 0 502 11 7 4 11 0 8 2 mcl8k 8192 10 0 10 2 1 1 1 0 8 1 mcl4k 4096 2589 0 2539 15 7 8 14 0 8 1 mcl2k 2048 538 0 538 7 6 1 6 0 8 1 mtagpl 96 9 0 6 1 0 1 1 0 8 0 mbufpl 256 9707 0 9517 216 195 21 216 0 8 1 bufpl 280 2601 0 128 177 0 177 177 0 8 0 anonpl 24 101257 0 98031 42 9 33 33 0 187 9 amapchunkpl 152 12723 0 12175 28 2 26 26 0 158 4 amappl16 200 1461 0 1430 4 1 3 4 0 8 0 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 104 0 94 1 0 1 1 0 8 0 amappl13 176 28 0 28 1 1 0 1 0 8 0 amappl12 168 1185 0 1155 3 1 2 3 0 8 0 amappl11 160 45 0 34 1 0 1 1 0 8 0 amappl10 152 7 0 6 1 0 1 1 0 8 0 amappl9 144 251 0 251 1 1 0 1 0 8 0 amappl8 136 23 0 22 1 0 1 1 0 8 0 amappl7 128 118 0 108 1 0 1 1 0 8 0 amappl6 120 211 0 208 1 0 1 1 0 8 0 amappl5 112 111 0 105 1 0 1 1 0 8 0 amappl4 104 285 0 268 1 0 1 1 0 8 0 amappl3 96 2184 0 2058 4 0 4 4 0 8 0 amappl2 88 636 0 582 2 0 2 2 0 8 0 amappl1 80 7935 0 7417 13 1 12 13 0 8 0 amappl 88 3735 0 3548 5 0 5 5 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 128 254 0 254 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 11 0 0 1 0 1 1 0 8 0 uaddrrnd 24 557 0 527 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 557 0 527 1 0 1 1 0 8 0 vmmpekpl 168 5971 0 5928 3 0 3 3 0 8 0 vmmpepl 168 39591 0 37778 81 1 80 80 0 357 1 vmsppl 360 556 0 527 4 1 3 4 0 8 0 rwobjpl 32 15422 0 12461 24 0 24 24 0 8 0 pdppl 4096 1121 0 1054 103 36 67 83 0 8 0 pvpl 32 254201 0 245582 121 14 107 107 0 265 27 pmappl 216 556 0 527 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 476 0 249 13 0 13 13 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(ffffffff83401a9c) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833b289a,ffffffff8337e115,bc,ffffffff83327483) at __assert+0x29 unveil_destroy(ffff8000ffff4d08) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80003c981c58,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80003c981c58,ffff80003391fa10,ffff80003391f960) at sys_exit+0x1a syscall(ffff80003391fa10) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74323ebe21d0, 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(ffffffff83401a9c) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833b289a,ffffffff8337e115,bc,ffffffff83327483) at __assert+0x29 unveil_destroy(ffff8000ffff4d08) at unveil_destroy+0x1dd sys/kern/kern_unveil.c:188 exit1(ffff80003c981c58,0,0,1) at exit1+0x60f sys/kern/kern_exit.c:233 sys_exit(ffff80003c981c58,ffff80003391fa10,ffff80003391f960) at sys_exit+0x1a syscall(ffff80003391fa10) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74323ebe21d0, count: -8