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(ffff8000ffff8c98) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188 exit1(ffff80002a6df7e8,0,0,3) at exit1+0x3d6 sys/kern/kern_exit.c:218 single_thread_check_locked(ffff80002a6df7e8,0,0) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2039 userret(ffff80002a6df7e8) at userret+0x6f single_thread_check sys/kern/kern_sig.c:2058 [inline] userret(ffff80002a6df7e8) at userret+0x6f sys/kern/kern_sig.c:1974 intr_user_exit() at intr_user_exit+0x3c end of kernel end trace frame: 0x7de5582b4180, 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(ffff8000ffff8c98) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188 exit1(ffff80002a6df7e8,0,0,3) at exit1+0x3d6 sys/kern/kern_exit.c:218 single_thread_check_locked(ffff80002a6df7e8,0,0) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2039 userret(ffff80002a6df7e8) at userret+0x6f single_thread_check sys/kern/kern_sig.c:2058 [inline] userret(ffff80002a6df7e8) at userret+0x6f sys/kern/kern_sig.c:1974 intr_user_exit() at intr_user_exit+0x3c end of kernel end trace frame: 0x7de5582b4180, count: -8 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800031b7dbf0 rbx 0xffff8000ffff8c98 rdx 0 rcx 0 rax 0xffff80002a6df7e8 r8 0 r9 0x8080808080808080 r10 0xd634b4d4253be176 r11 0xe274a93c89329926 r12 0 r13 0x2 r14 0 r15 0x1 rip 0xffffffff811a086c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800031b7dbe0 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb> show proc PROC (syz-executor.5) tid=461291 pid=44072 tcnt=1 stat=onproc flags process=1008 proc=82000 runpri=32, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a602d60 forw=0xffffffffffffffff, list=0xffff80002a6022c0,0xffff80002a6de010 process=0xffff8000ffff8c98 user=0xffff800031b78000, vmspace=0xfffffd807514e2f0 estcpu=34, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 11945 196637 5426 0 2 0 syz-executor.6 32982 408999 69424 0 2 0x480 syz-executor.4 32982 200592 69424 0 3 0x4000080 pipewr syz-executor.4 32982 242875 69424 0 3 0x4000080 fsleep syz-executor.4 7529 377888 72215 0 2 0x482 syz-executor.5 37898 275473 72215 0 2 0x2 syz-executor.7 16257 482474 0 0 3 0x14200 acct acct 5426 281298 72215 0 2 0x482 syz-executor.6 68497 79174 72215 0 2 0x2 syz-executor.3 19031 473954 0 0 3 0x14280 nfsidl nfsio 27145 512184 0 0 3 0x14280 nfsidl nfsio 38969 43838 0 0 3 0x14280 nfsidl nfsio 66133 287728 0 0 3 0x14280 nfsidl nfsio 48861 231600 0 0 3 0x14280 nfsidl nfsio 94066 44310 0 0 3 0x14280 nfsidl nfsio 9249 311413 0 0 3 0x14280 nfsidl nfsio 13183 474464 0 0 3 0x14280 nfsidl nfsio 28861 207012 0 0 3 0x14280 nfsidl nfsio 49688 273129 0 0 3 0x14280 nfsidl nfsio 41988 460061 0 0 3 0x14280 nfsidl nfsio 55964 416812 0 0 3 0x14280 nfsidl nfsio 95691 391972 0 0 3 0x14280 nfsidl nfsio 7858 380432 0 0 3 0x14280 nfsidl nfsio 41976 277726 0 0 3 0x14280 nfsidl nfsio 21168 319582 0 0 3 0x14280 nfsidl nfsio 31360 260268 0 0 3 0x14280 nfsidl nfsio 50991 145578 0 0 3 0x14280 nfsidl nfsio 98099 98545 0 0 3 0x14280 nfsidl nfsio 6300 196905 0 0 3 0x14280 nfsidl nfsio 4701 191918 72215 0 2 0x2 syz-executor.2 36788 477667 72215 0 2 0x482 syz-executor.0 16118 509947 1 0 3 0x18100083 ttyin getty 23503 334139 72215 0 2 0x2 syz-executor.1 69424 276964 72215 0 2 0x482 syz-executor.4 11399 208761 0 0 3 0x14200 bored sosplice 72215 243605 63328 0 3 0x1a000082 thrsleep syz-fuzzer 72215 224392 63328 0 2 0x1e000482 syz-fuzzer 72215 81424 63328 0 3 0x1e000082 wait syz-fuzzer 72215 37782 63328 0 3 0x1e000082 wait syz-fuzzer 72215 112293 63328 0 3 0x1e000082 thrsleep syz-fuzzer 72215 452557 63328 0 3 0x1e000082 wait syz-fuzzer 72215 458740 63328 0 3 0x1e000082 wait syz-fuzzer 72215 480138 63328 0 3 0x1e000082 thrsleep syz-fuzzer 72215 461572 63328 0 3 0x1e000082 wait syz-fuzzer 72215 45969 63328 0 3 0x1e000082 kqread syz-fuzzer 72215 430206 63328 0 3 0x1e000082 thrsleep syz-fuzzer 72215 286988 63328 0 3 0x1e000082 wait syz-fuzzer 72215 467932 63328 0 3 0x1e000082 wait syz-fuzzer 72215 332739 63328 0 3 0x1e000082 wait syz-fuzzer 63328 522815 97380 0 3 0x810008a sigsusp ksh 97380 398225 26096 0 3 0x1800009a kqread sshd 26096 100905 1 0 3 0x18000088 kqread sshd 84676 58606 61537 73 3 0x19100090 kqread syslogd 61537 70392 1 0 3 0x18100082 netio syslogd 75448 306525 1 0 3 0x18100080 kqread resolvd 26196 393478 73673 77 3 0x18100092 kqread dhcpleased 43119 423623 73673 77 3 0x18100092 kqread dhcpleased 73673 258593 1 0 3 0x18000080 kqread dhcpleased 9655 234437 0 0 3 0x14200 bored smr 3957 73016 0 0 2 0x14200 zerothread 39222 191794 0 0 3 0x14200 aiodoned aiodoned 68637 15394 0 0 3 0x14200 syncer update 85160 221945 0 0 3 0x14200 cleaner cleaner 34821 259339 0 0 2 0x14200 reaper 53715 462308 0 0 3 0x14200 pgdaemon pagedaemon 52811 226388 0 0 3 0x14200 bored viomb 5468 166213 0 0 3 0x40014200 acpi0 acpi0 73386 432827 0 0 3 0x14200 bored softnet3 94636 275589 0 0 3 0x14200 bored softnet2 13782 409330 0 0 3 0x14200 bored softnet1 4086 8648 0 0 3 0x14200 bored softnet0 89903 24736 0 0 3 0x14200 bored systqmp 71810 3851 0 0 3 0x14200 bored systq 25169 195978 0 0 2 0x40014200 softclock 43642 492932 0 0 3 0x40014200 idle0 1 189740 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 10202 6473K 7136K 166960K 23870 0 pcb 15 18K 20K 166960K 632 0 rtable 195 6K 7K 166960K 1548 0 pf 27 8K 9K 166960K 225 0 ifaddr 36 10K 12K 166960K 213 0 ifgroup 44 1K 2K 166960K 326 0 sysctl 1 0K 0K 166960K 1 0 counters 29 17K 17K 166960K 121 0 ioctlops 0 0K 2K 166960K 334 0 iov 0 0K 16K 166960K 566 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1526 96K 96K 166960K 5158 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 58 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 778 0 dirhash 12 2K 2K 166960K 33 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 15 53K 69K 166960K 5943 0 sigio 1 0K 0K 166960K 184 0 proc 62 75K 75K 166960K 1405 0 subproc 104 6K 6K 166960K 403 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 1117 0 in_multi 77 5K 7K 166960K 415 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 1342 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 396 167K 172K 166960K 56277 0 UVM aobj 131 8K 8K 166960K 135 0 pinsyscall 22 44K 100K 166960K 1965 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 110 0 NDP 10 0K 2K 166960K 166 0 temp 74 6804K 6932K 166960K 45601 0 kqueue 12 18K 26K 166960K 458 0 SYN cache 2 104K 112K 166960K 3 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 526 0 523 4 2 2 3 0 8 1 rtentry 112 480 0 391 4 0 4 4 0 8 0 unpcb 144 3868 0 3855 6 5 1 6 0 8 0 syncache 336 82 0 82 2 2 0 1 0 8 0 sackhl 24 3 0 3 1 1 0 1 0 8 0 tcpqe 32 79 0 79 2 2 0 1 0 8 0 tcpcb 808 2494 0 2483 17 15 2 14 0 8 0 arp 88 104 0 90 1 0 1 1 0 8 0 ipq 40 7 0 7 1 0 1 1 0 8 1 ipqe 40 170 0 170 1 0 1 1 0 8 1 inpcb 360 5253 0 5239 29 26 3 15 0 8 1 nd6 104 101 0 82 1 0 1 1 0 8 0 pkpcb 40 25 0 25 1 1 0 1 0 8 0 kcovpl 48 31 0 23 1 0 1 1 0 8 0 ppxss 1072 51 0 50 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1700 0 1317 30 3 27 30 0 8 0 art_table 32 1701 0 1317 4 0 4 4 0 8 0 art_node 16 479 0 399 1 0 1 1 0 8 0 sysvmsgpl 40 7 0 5 1 0 1 1 0 8 0 semapl 112 776 0 766 1 0 1 1 0 8 0 shmpl 112 132 0 4 4 0 4 4 0 8 0 dirhash 1024 31 0 14 3 0 3 3 0 8 0 dino2pl 256 9371 0 7836 97 0 97 97 0 8 0 ffsino 240 9371 0 7836 91 0 91 91 0 8 0 nchpl 144 17502 0 15779 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 61554 0 61554 6 5 1 3 0 8 1 vcpupl 2048 47 0 0 6 0 6 6 0 8 0 vmpool 664 53 0 6 4 0 4 4 0 8 0 kstatmem 264 204 0 184 2 0 2 2 0 8 0 scxspl 216 52390 0 52390 11 9 2 8 1 8 2 plimitpl 152 974 0 959 1 0 1 1 0 8 0 sigapl 424 6297 0 6231 8 0 8 8 0 8 0 futexpl 64 56317 0 56316 1 0 1 1 0 8 0 knotepl 120 65665 0 65583 10 4 6 10 0 8 0 kqueuepl 184 853 0 845 4 3 1 4 0 8 0 pipepl 288 1015 0 986 11 8 3 7 0 8 0 fdescpl 432 6179 0 6153 4 0 4 4 0 8 0 filepl 120 36922 0 36685 20 10 10 16 0 8 0 lockfpl 104 2227 0 2224 2 1 1 2 0 8 0 lockfspl 48 627 0 624 1 0 1 1 0 8 0 sessionpl 144 47 0 31 1 0 1 1 0 8 0 pgrppl 48 140 0 124 1 0 1 1 0 8 0 ucredpl 104 5216 0 5206 1 0 1 1 0 8 0 zombiepl 144 6308 0 6306 3 2 1 1 0 8 0 processpl 1072 6297 0 6231 5 0 5 5 0 8 0 procpl 680 14884 0 14801 9 1 8 9 0 8 0 sosppl 168 88 0 88 1 1 0 1 0 8 0 sockpl 488 9739 0 9709 149 140 9 37 0 8 4 mcl64k 65536 335 0 335 3 2 1 1 0 8 1 mcl16k 16384 164 0 164 3 2 1 1 0 8 1 mcl12k 12288 273 0 273 3 2 1 1 0 8 1 mcl9k 9216 122 0 122 2 1 1 1 0 8 1 mcl8k 8192 442 0 442 3 2 1 1 0 8 1 mcl4k 4096 680 0 680 4 3 1 2 0 8 1 mcl2k2 2112 41 0 41 1 1 0 1 0 8 0 mcl2k 2048 84830 0 84776 42 33 9 38 0 8 0 mtagpl 96 1146 0 964 14 6 8 14 0 8 0 mbufpl 256 182418 0 182147 78 45 33 51 0 8 0 bufpl 280 15396 0 9059 454 0 454 454 0 8 0 anonpl 24 692466 0 679119 109 16 93 109 0 188 0 amapchunkpl 152 199254 0 198459 53 15 38 49 0 158 2 amappl16 200 15517 0 15060 47 21 26 36 0 8 0 amappl15 192 52 0 51 1 0 1 1 0 8 0 amappl14 184 219 0 209 2 1 1 2 0 8 0 amappl13 176 27 0 27 2 2 0 1 0 8 0 amappl12 168 7156 0 7131 2 0 2 2 0 8 0 amappl11 160 48 0 37 1 0 1 1 0 8 0 amappl10 152 60 0 51 1 0 1 1 0 8 0 amappl9 144 191 0 190 1 0 1 1 0 8 0 amappl8 136 334 0 254 3 0 3 3 0 8 0 amappl7 128 87 0 71 1 0 1 1 0 8 0 amappl6 120 658 0 635 2 0 2 2 0 8 0 amappl5 112 398 0 386 1 0 1 1 0 8 0 amappl4 104 765 0 733 2 0 2 2 0 8 0 amappl3 96 35489 0 35417 3 0 3 3 0 8 0 amappl2 88 6902 0 6833 4 1 3 4 0 8 0 amappl1 80 31584 0 31092 22 9 13 22 0 8 0 amappl 88 55342 0 55110 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 72 134 0 4 3 0 3 3 0 8 0 uaddrrnd 24 6232 0 6158 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6232 0 6158 1 0 1 1 0 8 0 vmmpekpl 168 45855 0 45785 4 0 4 4 0 8 0 vmmpepl 168 387552 0 385344 179 66 113 141 0 357 0 vmsppl 352 6231 0 6158 7 0 7 7 0 8 0 rwobjpl 24 99940 0 92399 48 1 47 47 0 8 0 pdppl 4096 12470 0 12363 366 256 110 113 0 8 3 pvpl 32 1811130 0 1792424 402 233 169 360 0 265 0 pmappl 216 6231 0 6158 5 0 5 5 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 775 0 379 13 0 13 13 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(ffff8000ffff8c98) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188 exit1(ffff80002a6df7e8,0,0,3) at exit1+0x3d6 sys/kern/kern_exit.c:218 single_thread_check_locked(ffff80002a6df7e8,0,0) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2039 userret(ffff80002a6df7e8) at userret+0x6f single_thread_check sys/kern/kern_sig.c:2058 [inline] userret(ffff80002a6df7e8) at userret+0x6f sys/kern/kern_sig.c:1974 intr_user_exit() at intr_user_exit+0x3c end of kernel end trace frame: 0x7de5582b4180, 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(ffff8000ffff8c98) at unveil_destroy+0x174 sys/kern/kern_unveil.c:188 exit1(ffff80002a6df7e8,0,0,3) at exit1+0x3d6 sys/kern/kern_exit.c:218 single_thread_check_locked(ffff80002a6df7e8,0,0) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2039 userret(ffff80002a6df7e8) at userret+0x6f single_thread_check sys/kern/kern_sig.c:2058 [inline] userret(ffff80002a6df7e8) at userret+0x6f sys/kern/kern_sig.c:1974 intr_user_exit() at intr_user_exit+0x3c end of kernel end trace frame: 0x7de5582b4180, count: -8