panic: rw_enter: vcpulock locking against myself Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *239124 43544 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8246be6e) at panic+0x161 sys/kern/subr_prf.c:202 rw_enter(ffff800024916a60,1) at rw_enter+0x36f sys/kern/kern_rwlock.c:174 vm_run(ffff8000216e1480) at vm_run+0x20f sys/arch/amd64/amd64/vmm.c:4232 VOP_IOCTL(fffffd806ec3dc90,c0205602,ffff8000216e1480,1,fffffd807f7d8900,ffff8000216687e0) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:295 vn_ioctl(fffffd806980f6a8,c0205602,ffff8000216e1480,ffff8000216687e0) at vn_ioctl+0xb5 sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000216687e0,ffff8000216e1598,ffff8000216e15f0) at sys_ioctl+0x49e syscall(ffff8000216e1660) at syscall+0x571 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5f3645c90a0, count: 6 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: rw_enter: vcpulock locking against myself ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8246be6e) at panic+0x161 sys/kern/subr_prf.c:202 rw_enter(ffff800024916a60,1) at rw_enter+0x36f sys/kern/kern_rwlock.c:174 vm_run(ffff8000216e1480) at vm_run+0x20f sys/arch/amd64/amd64/vmm.c:4232 VOP_IOCTL(fffffd806ec3dc90,c0205602,ffff8000216e1480,1,fffffd807f7d8900,ffff8000216687e0) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:295 vn_ioctl(fffffd806980f6a8,c0205602,ffff8000216e1480,ffff8000216687e0) at vn_ioctl+0xb5 sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000216687e0,ffff8000216e1598,ffff8000216e15f0) at sys_ioctl+0x49e syscall(ffff8000216e1660) at syscall+0x571 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5f3645c90a0, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000216e1120 rbx 0x4 rdx 0x8b rcx 0x2 rax 0x31 r8 0xffffffff813e3a25 kprintf+0x145 r9 0x1 r10 0xa062e1da398b67fd r11 0xa99ebe9c7d96973b r12 0 r13 0xffff8000216687e4 r14 0 r15 0x1 rip 0xffffffff8155ed48 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000216e1110 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=239124 stat=onproc flags process=0 proc=4000000 pri=80, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff800021669260,0xffffffff8280e698 process=0xffff80002164afc8 user=0xffff8000216dc000, vmspace=0xfffffd806b068120 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 43544 340103 95756 0 2 0 syz-executor.0 *43544 239124 95756 0 7 0x4000000 syz-executor.0 9651 135118 37853 0 2 0x2 syz-executor.1 88405 360603 0 0 3 0x14200 bored sosplice 95756 324501 37853 0 3 0x82 nanoslp syz-executor.0 37853 185936 61704 0 3 0x82 thrsleep syz-fuzzer 37853 317913 61704 0 3 0x4000082 thrsleep syz-fuzzer 37853 359996 61704 0 3 0x4000082 kqread syz-fuzzer 37853 47017 61704 0 3 0x4000082 thrsleep syz-fuzzer 37853 73284 61704 0 3 0x4000082 thrsleep syz-fuzzer 37853 137806 61704 0 3 0x4000082 thrsleep syz-fuzzer 37853 28479 61704 0 3 0x4000082 thrsleep syz-fuzzer 61704 464313 86325 0 3 0x10008a sigsusp ksh 86325 325433 15221 0 3 0x9a select sshd 70110 122689 1 0 3 0x100083 ttyin getty 15221 229947 1 0 3 0x88 select sshd 5513 364252 46190 73 3 0x100090 kqread syslogd 46190 11538 1 0 3 0x100082 netio syslogd 56464 515076 1 0 3 0x100080 kqread resolvd 57822 293020 95387 77 3 0x100092 kqread dhcpleased 48642 178913 95387 77 3 0x100092 kqread dhcpleased 95387 24186 1 0 3 0x80 kqread dhcpleased 34540 57491 0 0 3 0x14200 bored smr 4338 90880 0 0 2 0x14200 zerothread 33555 197537 0 0 3 0x14200 aiodoned aiodoned 49512 3391 0 0 3 0x14200 syncer update 87076 156849 0 0 3 0x14200 cleaner cleaner 95942 183569 0 0 3 0x14200 reaper reaper 19041 70450 0 0 3 0x14200 pgdaemon pagedaemon 80303 400625 0 0 3 0x14200 bored crynlk 35732 507648 0 0 3 0x14200 bored crypto 74095 518415 0 0 3 0x14200 bored viomb 4055 137371 0 0 3 0x40014200 acpi0 acpi0 98812 114128 0 0 3 0x14200 bored softnet 86803 65920 0 0 3 0x14200 bored systqmp 43656 291681 0 0 3 0x14200 bored systq 72436 325371 0 0 3 0x40014200 bored softclock 70062 328683 0 0 3 0x40014200 idle0 1 437391 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 10125 6356K 7122K 78643K 14052 0 pcb 13 8K 8K 78643K 124 0 rtable 110 4K 7K 78643K 367 0 ifaddr 53 11K 13K 78643K 103 0 counters 21 16K 16K 78643K 28 0 ioctlops 0 0K 4K 78643K 110 0 iov 0 0K 16K 78643K 95 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1221 77K 77K 78643K 2138 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 12 0 VM map 2 0K 0K 78643K 2 0 sem 10 0K 0K 78643K 10 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 5 13K 25K 78643K 2735 0 sigio 0 0K 0K 78643K 23 0 proc 61 55K 71K 78643K 512 0 subproc 32 2K 2K 78643K 85 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 108 0 in_multi 33 2K 2K 78643K 194 0 ether_multi 1 0K 0K 78643K 41 0 mrt 0 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 43 201K 201K 78643K 43 0 exec 0 0K 2K 78643K 500 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 221 97K 116K 78643K 33505 0 UVM aobj 8 7K 7K 78643K 8 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 89 0 NDP 8 0K 0K 78643K 25 0 temp 113 4197K 4261K 78643K 21022 0 kqueue 10 14K 28K 78643K 234 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 98 0 95 1 0 1 1 0 8 0 rtentry 112 78 0 34 2 0 2 2 0 8 0 unpcb 120 594 0 581 1 0 1 1 0 8 0 syncache 296 6 0 6 2 2 0 1 0 8 0 tcpqe 32 424 0 424 2 2 0 1 0 8 0 tcpcb 736 298 0 291 7 5 2 3 0 8 1 arp 88 12 0 6 1 0 1 1 0 8 0 inpcb 304 912 0 904 5 4 1 2 0 8 0 nd6 48 15 0 9 1 0 1 1 0 8 0 kcovpl 48 5 0 3 1 0 1 1 0 8 0 pfstscr 40 8 0 7 1 0 1 1 0 8 0 pfrktable 1344 14 0 14 1 0 1 1 0 8 1 pftag 88 4 0 4 1 0 1 1 0 8 1 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 112 16 0 14 1 0 1 1 0 8 0 pfstate 320 8 0 7 1 0 1 1 0 8 0 pfrule 1360 15 0 15 3 2 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 321 0 132 12 0 12 12 0 8 0 art_table 32 322 0 132 2 0 2 2 0 8 0 art_node 16 77 0 37 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 2 1 0 1 1 0 8 0 semapl 112 8 0 0 1 0 1 1 0 8 0 shmpl 112 5 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 4797 0 3393 89 0 89 89 0 8 0 ffsino 240 4797 0 3393 83 0 83 83 0 8 0 nchpl 144 8237 0 6638 60 0 60 60 0 8 0 uvmvnodes 72 5503 0 0 101 0 101 101 0 8 0 vnodes 224 5503 0 0 324 0 324 324 0 8 0 namei 1024 20974 0 20973 2 1 1 1 0 8 0 vcpupl 1984 5 0 0 1 0 1 1 0 8 0 vmpool 528 15 0 10 1 0 1 1 0 8 0 pfiaddrpl 120 4 0 4 1 0 1 1 0 8 1 scsiplug 72 14 0 14 2 2 0 1 0 8 0 scxspl 216 24125 0 24125 10 9 1 8 0 8 1 plimitpl 152 83 0 75 1 0 1 1 0 8 0 sigapl 424 2957 0 2925 4 0 4 4 0 8 0 futexpl 56 25268 0 25268 2 1 1 1 0 8 1 knotepl 112 436 0 398 2 0 2 2 0 8 0 kqueuepl 184 1674 0 1667 1 0 1 1 0 8 0 pipepl 304 264 0 254 1 0 1 1 0 8 0 fdescpl 432 2941 0 2925 3 1 2 3 0 8 0 filepl 120 10563 0 10453 5 1 4 4 0 8 0 lockfpl 104 444 0 442 1 0 1 1 0 8 0 lockfspl 48 172 0 170 1 0 1 1 0 8 0 sessionpl 144 20 0 10 1 0 1 1 0 8 0 pgrppl 48 36 0 26 1 0 1 1 0 8 0 ucredpl 96 1408 0 1398 1 0 1 1 0 8 0 zombiepl 144 2925 0 2925 1 0 1 1 0 8 1 processpl 1008 2957 0 2925 5 0 5 5 0 8 0 procpl 672 5835 0 5796 4 0 4 4 0 8 0 sosppl 168 37 0 37 2 2 0 1 0 8 0 sockpl 448 1614 0 1590 6 2 4 4 0 8 0 mcl64k 65536 59 0 59 3 3 0 1 0 8 0 mcl16k 16384 52 0 52 6 6 0 1 0 8 0 mcl12k 12288 126 0 126 9 8 1 1 0 8 1 mcl9k 9216 27 0 27 5 5 0 1 0 8 0 mcl8k 8192 38 0 38 5 4 1 1 0 8 1 mcl4k 4096 142 0 142 8 7 1 1 0 8 1 mcl2k2 2112 18 0 18 3 3 0 1 0 8 0 mcl2k 2048 68055 0 67992 47 33 14 20 0 8 5 mtagpl 96 260 0 146 7 3 4 5 0 8 0 mbufpl 256 193247 0 192811 94 63 31 45 0 8 0 bufpl 280 7422 0 1015 458 0 458 458 0 8 0 anonpl 24 718491 0 707248 79 9 70 74 0 188 1 amapchunkpl 152 80678 0 80211 33 12 21 32 0 158 0 amappl16 200 5576 0 5225 22 3 19 22 0 8 0 amappl15 192 2176 0 2174 1 0 1 1 0 8 0 amappl14 184 218 0 214 1 0 1 1 0 8 0 amappl13 176 98 0 97 1 0 1 1 0 8 0 amappl12 168 2 0 1 1 0 1 1 0 8 0 amappl11 160 38 0 27 1 0 1 1 0 8 0 amappl10 152 127 0 122 1 0 1 1 0 8 0 amappl9 144 14 0 11 1 0 1 1 0 8 0 amappl8 136 638 0 584 2 0 2 2 0 8 0 amappl7 128 272 0 260 1 0 1 1 0 8 0 amappl6 120 142 0 125 1 0 1 1 0 8 0 amappl5 112 3153 0 3138 1 0 1 1 0 8 0 amappl4 104 860 0 835 1 0 1 1 0 8 0 amappl3 96 188 0 187 1 0 1 1 0 8 0 amappl2 88 548 0 492 2 0 2 2 0 8 0 amappl1 80 50904 0 50493 12 3 9 12 0 8 0 amappl 88 32865 0 32722 4 0 4 4 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 7 0 0 1 0 1 1 0 8 0 uaddrrnd 24 2956 0 2935 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2956 0 2935 1 0 1 1 0 8 0 vmmpekpl 168 19526 0 19505 2 0 2 2 0 8 0 vmmpepl 168 323489 0 321883 114 39 75 87 0 357 0 vmsppl 272 2955 0 2935 3 1 2 2 0 8 0 rwobjpl 24 56562 0 55504 7 0 7 7 0 8 0 pdppl 4096 5918 0 5875 71 26 45 47 0 8 2 pvpl 32 1553944 0 1539358 175 50 125 135 0 265 5 pmappl 192 2955 0 2935 2 0 2 2 0 8 1 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 446 0 155 9 0 9 9 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8246be6e) at panic+0x161 sys/kern/subr_prf.c:202 rw_enter(ffff800024916a60,1) at rw_enter+0x36f sys/kern/kern_rwlock.c:174 vm_run(ffff8000216e1480) at vm_run+0x20f sys/arch/amd64/amd64/vmm.c:4232 VOP_IOCTL(fffffd806ec3dc90,c0205602,ffff8000216e1480,1,fffffd807f7d8900,ffff8000216687e0) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:295 vn_ioctl(fffffd806980f6a8,c0205602,ffff8000216e1480,ffff8000216687e0) at vn_ioctl+0xb5 sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000216687e0,ffff8000216e1598,ffff8000216e15f0) at sys_ioctl+0x49e syscall(ffff8000216e1660) at syscall+0x571 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5f3645c90a0, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8246be6e) at panic+0x161 sys/kern/subr_prf.c:202 rw_enter(ffff800024916a60,1) at rw_enter+0x36f sys/kern/kern_rwlock.c:174 vm_run(ffff8000216e1480) at vm_run+0x20f sys/arch/amd64/amd64/vmm.c:4232 VOP_IOCTL(fffffd806ec3dc90,c0205602,ffff8000216e1480,1,fffffd807f7d8900,ffff8000216687e0) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:295 vn_ioctl(fffffd806980f6a8,c0205602,ffff8000216e1480,ffff8000216687e0) at vn_ioctl+0xb5 sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000216687e0,ffff8000216e1598,ffff8000216e15f0) at sys_ioctl+0x49e syscall(ffff8000216e1660) at syscall+0x571 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5f3645c90a0, count: -9