panic: kernel diagnostic assertion "ps->ps_uvncount == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_unveil.c", line 188 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff825a9d3c) at panic+0x177 sys/kern/subr_prf.c:198 __assert(ffffffff82623463,ffffffff82627923,bc,ffffffff825c4496) at __assert+0x25 sys/kern/subr_prf.c:157 unveil_destroy(ffff8000ffff25c8) at unveil_destroy+0x1a4 sys/kern/kern_unveil.c:188 exit1(ffff80002e6d6000,0,0,1) at exit1+0x3d5 sys/kern/kern_exit.c:219 sys_exit(ffff80002e6d6000,ffff800027c006a0,ffff800027c006f0) at sys_exit+0x16 sys/kern/kern_exit.c:89 syscall(ffff800027c00770) at syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff800027c00770) at syscall+0x438 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffffb7d0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: kernel diagnostic assertion "ps->ps_uvncount == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_unveil.c", line 188 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff825a9d3c) at panic+0x177 sys/kern/subr_prf.c:198 __assert(ffffffff82623463,ffffffff82627923,bc,ffffffff825c4496) at __assert+0x25 sys/kern/subr_prf.c:157 unveil_destroy(ffff8000ffff25c8) at unveil_destroy+0x1a4 sys/kern/kern_unveil.c:188 exit1(ffff80002e6d6000,0,0,1) at exit1+0x3d5 sys/kern/kern_exit.c:219 sys_exit(ffff80002e6d6000,ffff800027c006a0,ffff800027c006f0) at sys_exit+0x16 sys/kern/kern_exit.c:89 syscall(ffff800027c00770) at syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff800027c00770) at syscall+0x438 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffffb7d0, count: -8 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800027c004b0 rbx 0xffffffff82952b8f cpu_info_full_primary+0x2b8f rdx 0 rcx 0 rax 0xffff80002e6d6000 r8 0x101010101010101 r9 0x8080808080808080 r10 0xea3ca00f939dece1 r11 0xc4fffde950d9a900 r12 0xffffffff82952990 cpu_info_full_primary+0x2990 r13 0 r14 0 r15 0x1 rip 0xffffffff8157f0e8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800027c004a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.4) pid=345886 stat=onproc flags process=1008 proc=2000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80002e6d67e0,0xffff800021324fd0 process=0xffff8000ffff25c8 user=0xffff800027bfb000, vmspace=0xfffffd807640c178 estcpu=36, cpticks=13, pctcpu=0.4 user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 34036 53842 68062 0 2 0x480 syz-executor.7 34036 325038 68062 0 3 0x4000080 netcon syz-executor.7 34036 352830 68062 0 3 0x4000080 fsleep syz-executor.7 74019 56082 10701 0 3 0x80 nanoslp syz-executor.3 74019 272791 10701 0 3 0x4000080 netcon syz-executor.3 74019 17643 10701 0 3 0x4000080 fsleep syz-executor.3 10620 439723 60483 0 3 0x80 nanoslp syz-executor.5 10620 454243 60483 0 3 0x4000080 netcon syz-executor.5 10620 269002 60483 0 3 0x4000080 fsleep syz-executor.5 10620 110854 60483 0 3 0x4000080 fsleep syz-executor.5 41576 138087 53070 0 3 0x82 nanoslp syz-executor.6 89378 424268 53070 0 3 0x82 nanoslp syz-executor.4 34945 388027 53070 0 3 0x82 piperd syz-executor.2 83177 493318 53070 0 2 0x2 syz-executor.1 10701 299417 53070 0 3 0x82 nanoslp syz-executor.3 60483 12447 53070 0 3 0x82 nanoslp syz-executor.5 68062 2293 53070 0 3 0x82 nanoslp syz-executor.7 66586 502922 1 0 3 0x100083 ttyopn getty 18183 18074 53070 0 3 0x82 piperd syz-executor.0 7908 318831 0 0 3 0x14200 acct acct 70317 190162 0 0 3 0x14280 nfsidl nfsio 78318 167174 0 0 3 0x14280 nfsidl nfsio 73117 94620 0 0 3 0x14280 nfsidl nfsio 10850 366966 0 0 3 0x14280 nfsidl nfsio 17515 230367 0 0 3 0x14280 nfsidl nfsio 3932 508572 0 0 3 0x14280 nfsidl nfsio 89679 169657 0 0 3 0x14280 nfsidl nfsio 81365 293729 0 0 3 0x14280 nfsidl nfsio 73342 435938 0 0 3 0x14280 nfsidl nfsio 7098 401995 0 0 3 0x14280 nfsidl nfsio 6394 264016 0 0 3 0x14280 nfsidl nfsio 39197 320840 0 0 3 0x14280 nfsidl nfsio 61778 454290 0 0 3 0x14280 nfsidl nfsio 82420 480015 0 0 3 0x14280 nfsidl nfsio 93333 502247 0 0 3 0x14280 nfsidl nfsio 76357 95772 0 0 3 0x14280 nfsidl nfsio 46777 98899 0 0 3 0x14280 nfsidl nfsio 49801 37045 0 0 3 0x14280 nfsidl nfsio 20615 490816 0 0 3 0x14280 nfsidl nfsio 22704 77567 0 0 3 0x14280 nfsidl nfsio 72225 108244 0 0 3 0x14200 bored sosplice 53070 480075 40818 0 3 0x82 thrsleep syz-fuzzer 53070 138438 40818 0 2 0x4000482 syz-fuzzer 53070 190888 40818 0 3 0x4000082 thrsleep syz-fuzzer 53070 284562 40818 0 3 0x4000082 thrsleep syz-fuzzer 53070 134511 40818 0 3 0x4000082 wait syz-fuzzer 53070 213122 40818 0 3 0x4000082 thrsleep syz-fuzzer 53070 290447 40818 0 3 0x4000082 kqread syz-fuzzer 53070 13768 40818 0 3 0x4000082 wait syz-fuzzer 53070 98340 40818 0 3 0x4000082 thrsleep syz-fuzzer 53070 288316 40818 0 3 0x4000082 wait syz-fuzzer 53070 238606 40818 0 3 0x4000082 wait syz-fuzzer 53070 321851 40818 0 3 0x4000082 wait syz-fuzzer 53070 78416 40818 0 3 0x4000082 wait syz-fuzzer 53070 55070 40818 0 3 0x4000082 wait syz-fuzzer 53070 67312 40818 0 3 0x4000082 thrsleep syz-fuzzer 53070 470664 40818 0 3 0x4000082 wait syz-fuzzer 40818 369521 91647 0 3 0x10008a sigsusp ksh 91647 491915 66034 0 3 0x9a kqread sshd 66034 396920 1 0 3 0x88 kqread sshd 1127 392353 56750 74 3 0x1100092 bpf pflogd 56750 413878 1 0 3 0x80 netio pflogd 57336 253882 49704 73 3 0x1100090 kqread syslogd 49704 271544 1 0 3 0x100082 netio syslogd 13726 112679 1 0 3 0x100080 kqread resolvd 15100 183778 0 0 3 0x14200 bored smr 96591 336744 0 0 2 0x14200 zerothread 77696 513630 0 0 3 0x14200 aiodoned aiodoned 51155 151043 0 0 3 0x14200 syncer update 83624 31886 0 0 3 0x14200 cleaner cleaner 53772 277337 0 0 2 0x14200 reaper 71837 229440 0 0 3 0x14200 pgdaemon pagedaemon 53266 17719 0 0 3 0x14200 bored viomb 91209 131505 0 0 3 0x40014200 acpi0 acpi0 24579 444857 0 0 7 0x40014200 idle1 48734 210787 0 0 3 0x14200 bored softnet 60228 244641 0 0 3 0x14200 bored softnet 8577 421068 0 0 3 0x14200 bored softnet 80053 7700 0 0 3 0x14200 bored softnet 6056 442715 0 0 3 0x14200 bored systqmp 48607 59177 0 0 3 0x14200 bored systq 87472 497376 0 0 3 0x40014200 bored softclock 42403 501392 0 0 3 0x40014200 idle0 1 137444 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10229 6570K 6669K 78643K 12629 0 pcb 13 16K 19K 78643K 1640 0 rtable 217 16K 16K 78643K 1586 0 ifaddr 87 19K 20K 78643K 579 0 sysctl 3 1K 1K 78643K 5 0 counters 58 35K 36K 78643K 478 0 ioctlops 0 0K 4K 78643K 2262 0 iov 0 0K 28K 78643K 1925 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1337 84K 84K 78643K 3328 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 3 5K 13K 78643K 106 0 VM map 2 1K 1K 78643K 2 0 sem 9 3K 5K 78643K 20 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 13 45K 85K 78643K 5934 0 sigio 0 0K 0K 78643K 177 0 proc 68 91K 128K 78643K 1585 0 subproc 104 6K 6K 78643K 468 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 504 0 in_multi 88 5K 6K 78643K 564 0 ether_multi 1 0K 0K 78643K 22 0 mrt 1 0K 0K 78643K 18 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 199 890K 890K 78643K 199 0 exec 0 0K 1K 78643K 1275 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 425 530K 531K 78643K 42392 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 196 0 NDP 15 0K 2K 78643K 195 0 temp 147 4698K 70230K 78643K 123371 0 kqueue 6 10K 26K 78643K 717 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 385 0 384 5 4 1 3 0 8 0 rtentry 112 538 0 446 4 1 3 4 0 8 0 unpcb 144 5460 0 5450 61 60 1 6 0 8 0 syncache 296 47 0 47 10 9 1 1 0 8 1 tcpqe 32 76 0 76 6 5 1 1 0 8 1 tcpcb 776 7829 0 7820 107 99 8 18 0 8 6 arp 120 76 0 60 1 0 1 1 0 8 0 inpcb 368 12052 0 12043 119 111 8 22 0 8 6 nd6 48 117 0 96 1 0 1 1 0 8 0 kcovpl 48 36 0 28 1 0 1 1 0 8 0 mppekey 1024 3 0 3 1 1 0 1 0 8 0 ppxss 1256 150 0 150 13 12 1 1 0 8 1 pppxif 1448 28 0 28 10 10 0 1 0 8 0 pfstscr 40 46 0 45 2 1 1 1 0 8 0 pffrag 232 70 0 70 1 1 0 1 0 482 0 pffrnode 88 70 0 70 1 1 0 1 0 8 0 pffrent 40 143 0 143 1 1 0 1 0 8 0 pfosfp 40 1431 0 1007 5 0 5 5 0 8 0 pfosfpen 112 1431 0 716 21 0 21 21 0 8 0 pfanchor 1280 904 18 392 47 4 43 43 0 8 0 pfstitem 24 106 0 102 1 0 1 1 0 8 0 pfstkey 120 196 0 192 2 1 1 2 0 8 0 pfstate 384 150 0 147 5 4 1 4 0 8 0 pfrule 1344 21 0 20 2 1 1 2 0 8 0 rttmr 136 7 0 7 2 2 0 1 0 8 0 art_heap8 4096 12 0 11 10 9 1 3 0 8 0 art_heap4 256 2585 0 2178 43 17 26 29 0 8 0 art_table 32 2597 0 2189 4 0 4 4 0 8 0 art_node 16 537 0 457 1 0 1 1 0 8 0 sysvmsgpl 40 17 0 15 4 3 1 1 0 8 0 semupl 112 5 0 5 1 1 0 1 0 8 0 semapl 112 7 0 0 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 9029 0 7558 93 0 93 93 0 8 0 ffsino 272 9029 0 7558 99 0 99 99 0 8 0 nchpl 144 17229 0 15583 63 0 63 63 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 66277 0 66277 3 1 2 2 0 8 2 percpumem 16 251 0 210 1 0 1 1 0 8 0 vcpupl 2048 126 0 0 16 0 16 16 0 8 0 vmpool 568 150 0 24 10 1 9 9 0 8 0 kstatmem 264 236 0 206 6 3 3 3 0 8 0 scsiplug 72 3 0 3 1 1 0 1 0 8 0 scxspl 216 48212 0 48212 13 12 1 8 0 8 1 plimitpl 152 1192 0 1177 1 0 1 1 0 8 0 sigapl 424 6217 0 6153 9 1 8 8 0 8 0 futexpl 64 65023 0 65019 2 1 1 1 0 8 0 knotepl 120 571 0 0 10 0 10 10 0 8 0 kqueuepl 216 1457 0 1452 22 21 1 6 0 8 0 pipepl 320 1845 0 1817 58 55 3 11 0 8 0 fdescpl 496 6178 0 6155 6 2 4 5 0 8 0 filepl 152 50589 0 50356 92 77 15 24 0 8 3 lockfpl 104 2961 0 2959 5 3 2 2 0 8 1 lockfspl 48 628 0 626 1 0 1 1 0 8 0 sessionpl 144 53 0 37 1 0 1 1 0 8 0 pgrppl 48 75 0 59 1 0 1 1 0 8 0 ucredpl 104 6669 0 6660 1 0 1 1 0 8 0 zombiepl 144 7038 0 7036 3 2 1 1 0 8 0 processpl 1072 6217 0 6153 5 0 5 5 0 8 0 procpl 672 16796 0 16709 19 10 9 10 0 8 0 srpgc 96 32 0 32 11 11 0 1 0 8 0 sosppl 168 67 0 67 10 9 1 1 0 8 1 sockpl 488 17897 0 17877 339 328 11 40 0 8 8 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 7 0 0 1 0 1 1 0 8 0 mcl9k 9216 5 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 515 0 0 64 3 61 64 0 8 0 mtagpl 96 18 0 0 1 0 1 1 0 8 0 mbufpl 256 1043 0 0 54 0 54 54 0 8 0 bufpl 288 12881 0 6549 453 0 453 453 0 8 0 anonpl 24 1271441 0 1254687 161 42 119 133 0 186 0 amapchunkpl 152 118670 0 117896 57 23 34 41 0 158 0 amappl16 200 12111 0 11557 100 68 32 45 0 8 0 amappl15 192 23 0 22 1 0 1 1 0 8 0 amappl14 184 230 0 220 2 0 2 2 0 8 0 amappl13 176 10 0 10 2 2 0 1 0 8 0 amappl12 168 760 0 757 1 0 1 1 0 8 0 amappl11 160 60 0 51 1 0 1 1 0 8 0 amappl10 152 88 0 76 1 0 1 1 0 8 0 amappl9 144 986 0 985 3 2 1 1 0 8 0 amappl8 136 402 0 302 4 0 4 4 0 8 0 amappl7 128 230 0 204 2 0 2 2 0 8 0 amappl6 120 333 0 317 3 2 1 3 0 8 0 amappl5 112 296 0 290 1 0 1 1 0 8 0 amappl4 104 796 0 764 2 1 1 2 0 8 0 amappl3 96 17890 0 17842 2 0 2 2 0 8 0 amappl2 88 6941 0 6878 3 1 2 3 0 8 0 amappl1 80 143491 0 142843 24 8 16 23 0 8 0 amappl 88 41372 0 41144 8 2 6 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 6328 0 6178 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6328 0 6178 1 0 1 1 0 8 0 vmmpekpl 168 51916 0 51836 4 0 4 4 0 8 0 vmmpepl 168 578751 0 575994 296 154 142 162 0 357 3 vmsppl 368 6327 0 6178 15 1 14 14 0 8 0 rwobjpl 56 158621 0 150886 122 11 111 114 0 8 0 pdppl 4096 12663 0 12482 424 235 189 190 0 8 8 pvpl 32 2473295 0 2451294 353 154 199 275 0 265 0 pmappl 248 6327 0 6178 11 1 10 10 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1421 0 392 30 0 30 30 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff825a9d3c) at panic+0x177 sys/kern/subr_prf.c:198 __assert(ffffffff82623463,ffffffff82627923,bc,ffffffff825c4496) at __assert+0x25 sys/kern/subr_prf.c:157 unveil_destroy(ffff8000ffff25c8) at unveil_destroy+0x1a4 sys/kern/kern_unveil.c:188 exit1(ffff80002e6d6000,0,0,1) at exit1+0x3d5 sys/kern/kern_exit.c:219 sys_exit(ffff80002e6d6000,ffff800027c006a0,ffff800027c006f0) at sys_exit+0x16 sys/kern/kern_exit.c:89 syscall(ffff800027c00770) at syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff800027c00770) at syscall+0x438 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffffb7d0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020dd8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020dd8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:175 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800020dd8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020dd8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:175 end trace frame: 0x0, count: -5