witness: userret: returning with the following locks held: exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829f8c18) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 vmx_mprotect_ept+0x42 sys/arch/amd64/amd64/vmm.c:997 #2 vmmioctl+0x1a2 sys/arch/amd64/amd64/vmm.c:513 #3 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 #4 vn_ioctl+0xba sys/kern/vfs_vnops.c:531 #5 sys_ioctl+0x4a2 #6 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] #6 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 #7 Xsyscall+0x128 panic: witness_warn Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *448718 15000 0 0 0x4000000 0K syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff824420f1) at panic+0x177 sys/kern/subr_prf.c:202 witness_warn(2,0,ffffffff824c9251) at witness_warn+0x68f witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_warn(2,0,ffffffff824c9251) at witness_warn+0x68f sys/kern/subr_witness.c:1473 userret(ffff800025f667f0) at userret+0x253 sys/kern/kern_sig.c:1952 syscall(ffff800025f6d020) at syscall+0x4a1 mi_syscall_return sys/sys/syscall_mi.h:129 [inline] syscall(ffff800025f6d020) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:609 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x69fb1b17b90, count: 9 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: witness_warn ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff824420f1) at panic+0x177 sys/kern/subr_prf.c:202 witness_warn(2,0,ffffffff824c9251) at witness_warn+0x68f witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_warn(2,0,ffffffff824c9251) at witness_warn+0x68f sys/kern/subr_witness.c:1473 userret(ffff800025f667f0) at userret+0x253 sys/kern/kern_sig.c:1952 syscall(ffff800025f6d020) at syscall+0x4a1 mi_syscall_return sys/sys/syscall_mi.h:129 [inline] syscall(ffff800025f6d020) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:609 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x69fb1b17b90, count: -6 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800025f6cd80 rbx 0xffffffff8276fbff cpu_info_full_primary+0x2bff rdx 0x8b rcx 0x2 rax 0x14 r8 0xffffffff81e8cde4 kprintf+0x144 r9 0x1 r10 0x7fd11bc4d6e1d487 r11 0x2562289ea329a91e r12 0xffffffff8276fa00 cpu_info_full_primary+0x2a00 r13 0 r14 0 r15 0x1 rip 0xffffffff823b2108 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800025f6cd70 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=448718 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800025f66a90,0xffffffff829f24e0 process=0xffff80002573f690 user=0xffff800025f68000, vmspace=0xfffffd807e8f78b8 estcpu=36, cpticks=5, pctcpu=0.0 user=0, sys=5, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 15000 35370 95188 0 2 0 syz-executor.1 *15000 448718 95188 0 7 0x4000000 syz-executor.1 7845 203078 1 0 3 0x100083 ttyin getty 95188 453407 10543 0 2 0x482 syz-executor.1 75805 16550 10543 0 2 0x2 syz-executor.0 33579 488705 0 0 3 0x14280 nfsidl nfsio 72212 320267 0 0 3 0x14280 nfsidl nfsio 63345 404111 0 0 3 0x14280 nfsidl nfsio 20704 185857 0 0 3 0x14280 nfsidl nfsio 53209 159945 0 0 3 0x14280 nfsidl nfsio 50873 428315 0 0 3 0x14280 nfsidl nfsio 25884 286491 0 0 3 0x14280 nfsidl nfsio 71089 421131 0 0 3 0x14280 nfsidl nfsio 6703 346663 0 0 3 0x14280 nfsidl nfsio 26461 295248 0 0 3 0x14280 nfsidl nfsio 75019 180438 0 0 3 0x14280 nfsidl nfsio 38227 466282 0 0 3 0x14280 nfsidl nfsio 92604 260969 0 0 3 0x14280 nfsidl nfsio 67346 255803 0 0 3 0x14280 nfsidl nfsio 81093 490056 0 0 3 0x14280 nfsidl nfsio 38022 21340 0 0 3 0x14280 nfsidl nfsio 26145 521925 0 0 3 0x14280 nfsidl nfsio 81692 505455 0 0 3 0x14280 nfsidl nfsio 88320 497529 0 0 3 0x14280 nfsidl nfsio 8344 208197 0 0 3 0x14280 nfsidl nfsio 3029 43943 0 0 3 0x14200 acct acct 8821 148423 0 0 3 0x14200 bored sosplice 10543 150259 57644 0 3 0x82 thrsleep syz-fuzzer 10543 40278 57644 0 2 0x4000482 syz-fuzzer 10543 331688 57644 0 3 0x4000082 thrsleep syz-fuzzer 10543 190645 57644 0 2 0x4000482 syz-fuzzer 10543 184660 57644 0 3 0x4000082 thrsleep syz-fuzzer 10543 421351 57644 0 2 0x4000482 syz-fuzzer 10543 119092 57644 0 3 0x4000082 thrsleep syz-fuzzer 10543 149852 57644 0 3 0x4000082 thrsleep syz-fuzzer 57644 506255 63505 0 3 0x10008a sigsusp ksh 63505 129343 18001 0 3 0x9a kqread sshd 18001 499618 1 0 3 0x88 kqread sshd 93266 279134 3244 74 3 0x100092 bpf pflogd 3244 416843 1 0 3 0x80 netio pflogd 45051 141011 73140 73 2 0x100090 syslogd 73140 104518 1 0 3 0x100082 netio syslogd 33599 418031 1 0 3 0x100080 kqread resolvd 8306 81851 0 0 3 0x14200 bored smr 8491 412737 0 0 2 0x14200 zerothread 1527 499321 0 0 3 0x14200 aiodoned aiodoned 94557 247710 0 0 3 0x14200 syncer update 44065 314794 0 0 3 0x14200 cleaner cleaner 68371 185136 0 0 3 0x14200 reaper reaper 32961 218150 0 0 3 0x14200 pgdaemon pagedaemon 7822 151625 0 0 3 0x14200 bored viomb 19763 497489 0 0 3 0x40014200 acpi0 acpi0 53043 353545 0 0 7 0x40014200 idle1 7451 371136 0 0 3 0x14200 bored softnet 10642 241488 0 0 3 0x14200 bored systqmp 27198 187968 0 0 3 0x14200 bored systq 56483 104560 0 0 3 0x40014200 bored softclock 81921 482978 0 0 3 0x40014200 idle0 1 201681 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 15000 (syz-executor.1) thread 0xffff800025f667f0 (448718) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829f8c18) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 vmx_mprotect_ept+0x42 sys/arch/amd64/amd64/vmm.c:997 #2 vmmioctl+0x1a2 sys/arch/amd64/amd64/vmm.c:513 #3 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 #4 vn_ioctl+0xba sys/kern/vfs_vnops.c:531 #5 sys_ioctl+0x4a2 #6 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] #6 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 #7 Xsyscall+0x128 Process 75805 (syz-executor.0) thread 0xffff80002125ed28 (16550) exclusive rrwlock inode r = 0 (0xfffffd806771a5f0) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 rw_enter+0x3e2 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1347 #6 ffs_inode_alloc+0x1c3 sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #8 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404 #9 domkdirat+0x121 sys/kern/vfs_syscalls.c:3065 #10 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] #10 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80738074e8) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 rw_enter+0x3e2 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xdd sys/kern/vfs_lookup.c:413 #6 namei+0x55a sys/kern/vfs_lookup.c:245 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3050 #8 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10137 6455K 7434K 78643K 34667 0 pcb 13 8K 8K 78643K 1200 0 rtable 63 12K 14K 78643K 2606 0 ifaddr 48 14K 17K 78643K 900 0 sysctl 3 1K 1K 78643K 3 0 counters 44 34K 34K 78643K 334 0 ioctlops 0 0K 4K 78643K 2743 0 iov 0 0K 16K 78643K 688 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1247 78K 79K 78643K 8541 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 75 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 1318 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 5 13K 25K 78643K 10041 0 sigio 0 0K 0K 78643K 62 0 proc 64 63K 111K 78643K 1673 0 subproc 66 4K 4K 78643K 1027 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1069 0 in_multi 9 0K 2K 78643K 1622 0 ether_multi 1 0K 0K 78643K 162 0 mrt 1 0K 0K 78643K 73 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 115 519K 519K 78643K 115 0 exec 0 0K 2K 78643K 1799 0 pfkey data 0 0K 1K 78643K 14 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 7 26K 26K 78643K 7 0 UVM amap 401 825K 830K 78643K 120665 0 UVM aobj 131 8K 8K 78643K 150 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 1K 78643K 1039 0 NDP 8 0K 0K 78643K 327 0 temp 90 4198K 8294K 78643K 131413 0 kqueue 8 14K 42K 78643K 703 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 120 651 0 650 1 0 1 1 0 8 0 rtentry 112 927 0 914 4 3 1 2 0 8 0 unpcb 128 3535 0 3527 5 4 1 3 0 8 0 syncache 296 74 0 74 22 22 0 1 0 8 0 tcpqe 32 108 102 108 3 3 0 1 0 8 0 tcpcb 736 3072 0 3046 22 19 3 4 0 8 0 arp 120 99 0 97 1 0 1 1 0 8 0 inpcb 304 10517 0 10500 15 12 3 3 0 8 1 rttmr 72 20 0 20 11 11 0 1 0 8 0 nd6 48 250 0 250 1 1 0 1 0 8 0 pkpcb 40 74 0 74 22 22 0 1 0 8 0 kcovpl 48 31 0 29 1 0 1 1 0 8 0 ppxss 1248 36 0 36 20 19 1 1 0 8 1 pffrag 232 56 0 55 10 9 1 1 0 482 0 pffrnode 88 56 0 55 10 9 1 1 0 8 0 pffrent 40 771 0 770 12 11 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfrktable 1344 11 0 9 1 0 1 1 0 8 0 pftag 88 2 0 2 1 1 0 1 0 8 0 pfstitem 24 51 0 46 1 0 1 1 0 8 0 pfstkey 112 51 0 46 1 0 1 1 0 8 0 pfstate 320 51 0 46 2 1 1 2 0 8 0 pfrule 1360 32 0 26 2 1 1 2 0 8 0 art_heap8 4096 8 0 6 7 5 2 3 0 8 0 art_heap4 256 4875 0 4856 54 52 2 18 0 8 0 art_table 32 4883 0 4862 4 3 1 3 0 8 0 art_node 16 917 0 909 1 0 1 1 0 8 0 sysvmsgpl 40 34 0 20 1 0 1 1 0 8 0 semupl 112 5 0 5 2 2 0 1 0 8 0 semapl 112 1313 0 1303 1 0 1 1 0 8 0 shmpl 112 147 0 19 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 14020 0 12596 90 0 90 90 0 8 0 ffsino 272 14020 0 12596 96 0 96 96 0 8 0 nchpl 144 27120 0 26656 61 41 20 61 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 87955 0 87954 15 14 1 1 0 8 0 percpumem 16 179 0 145 1 0 1 1 0 8 0 vcpupl 2048 86 0 0 11 0 11 11 0 8 0 vmpool 560 98 0 12 8 1 7 7 0 8 0 pfiaddrpl 120 3 0 2 1 0 1 1 0 8 0 scsiplug 72 10 0 10 7 6 1 1 0 8 1 scxspl 216 83033 0 83033 29 28 1 6 0 8 1 plimitpl 152 624 0 616 1 0 1 1 0 8 0 sigapl 424 10281 0 10230 14 7 7 7 0 8 0 futexpl 64 173984 0 173984 14 13 1 1 0 8 1 knotepl 112 178 0 0 3 0 3 3 0 8 0 kqueuepl 216 2420 0 2405 18 16 2 2 0 8 1 pipepl 336 1385 0 1375 10 8 2 2 0 8 1 fdescpl 496 10204 0 10189 3 0 3 3 0 8 0 filepl 152 58337 0 58207 23 16 7 9 0 8 1 lockfpl 104 2258 0 2257 1 0 1 1 0 8 0 lockfspl 48 766 0 765 1 0 1 1 0 8 0 sessionpl 144 53 0 43 1 0 1 1 0 8 0 pgrppl 48 83 0 73 1 0 1 1 0 8 0 ucredpl 96 6956 0 6945 1 0 1 1 0 8 0 zombiepl 144 10230 0 10230 4 3 1 1 0 8 1 processpl 1072 10281 0 10230 5 1 4 4 0 8 0 procpl 672 22869 0 22810 9 3 6 6 0 8 0 srpgc 96 12 0 12 5 5 0 1 0 8 0 sosppl 168 90 0 90 25 25 0 1 0 8 0 sockpl 480 14845 0 14819 45 39 6 11 0 8 2 mcl64k 65536 20 0 0 3 0 3 3 0 8 0 mcl16k 16384 8 0 0 1 0 1 1 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 24 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 1 2 3 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 459 0 0 38 2 36 36 0 8 0 mtagpl 96 597 0 0 9 0 9 9 0 8 0 mbufpl 256 1521 0 0 76 2 74 74 0 8 0 bufpl 280 23468 0 17139 453 0 453 453 0 8 0 anonpl 24 2735254 0 2717352 275 160 115 129 0 186 6 amapchunkpl 152 303091 0 302423 270 231 39 41 0 158 13 amappl16 200 23879 0 23259 168 134 34 46 0 8 1 amappl15 192 528 0 522 1 0 1 1 0 8 0 amappl14 184 1344 0 1342 1 0 1 1 0 8 0 amappl13 176 1732 0 1730 1 0 1 1 0 8 0 amappl12 168 3774 0 3773 1 0 1 1 0 8 0 amappl11 160 1093 0 1082 1 0 1 1 0 8 0 amappl10 152 871 0 867 1 0 1 1 0 8 0 amappl9 144 558 0 558 2 2 0 1 0 8 0 amappl8 136 1559 0 1480 4 1 3 3 0 8 0 amappl7 128 715 0 708 1 0 1 1 0 8 0 amappl6 120 485 0 472 1 0 1 1 0 8 0 amappl5 112 7590 0 7570 1 0 1 1 0 8 0 amappl4 104 3345 0 3315 1 0 1 1 0 8 0 amappl3 96 5204 0 5188 1 0 1 1 0 8 0 amappl2 88 13844 0 13794 6 4 2 2 0 8 0 amappl1 80 169148 0 168751 15 5 10 13 0 8 0 amappl 88 119560 0 119344 6 0 6 6 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 64 149 0 19 3 0 3 3 0 8 0 uaddrrnd 24 10302 0 10201 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 10302 0 10201 1 0 1 1 0 8 0 vmmpekpl 168 52896 0 52843 3 0 3 3 0 8 0 vmmpepl 168 910035 0 908070 520 425 95 119 0 357 0 vmsppl 368 10301 0 10201 11 1 10 10 0 8 0 rwobjpl 56 204055 0 202643 57 36 21 25 0 8 0 pdppl 4096 20612 0 20488 188 61 127 127 0 8 3 pvpl 32 4728034 0 4707729 456 268 188 205 0 265 18 pmappl 224 10301 0 10201 6 0 6 6 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 636 0 168 14 0 14 14 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:440 panic(ffffffff824420f1) at panic+0x177 sys/kern/subr_prf.c:202 witness_warn(2,0,ffffffff824c9251) at witness_warn+0x68f witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_warn(2,0,ffffffff824c9251) at witness_warn+0x68f sys/kern/subr_witness.c:1473 userret(ffff800025f667f0) at userret+0x253 sys/kern/kern_sig.c:1952 syscall(ffff800025f6d020) at syscall+0x4a1 mi_syscall_return sys/sys/syscall_mi.h:129 [inline] syscall(ffff800025f6d020) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:609 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x69fb1b17b90, count: -6 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020d38ff0) 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+0x2eb sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020d38ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800020d38ff0) 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+0x2eb sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020d38ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: -5