login: witness: exclusive lock of (rwlock) vmmaplk while share locked panic: share->excl Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 270547 69148 32767 0x10 0 1 syz-executor.2 *104622 69148 32767 0x10 0x4000000 0K syz-executor.2 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8257690f) at panic+0x177 sys/kern/subr_prf.c:202 witness_checkorder(fffffd806c890e90,9,0) at witness_checkorder+0x11bd witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_checkorder(fffffd806c890e90,9,0) at witness_checkorder+0x11bd sys/kern/subr_witness.c:772 rw_enter(fffffd806c890e80,21) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 vm_map_lock_ln(fffffd806c890e78,42d,ffff800024674000) at vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5466 uvm_map_extract(fffffd806c890e78,7f7ffffc3000,1000,ffff80002e36ede0,0) at uvm_map_extract+0x173 sys/uvm/uvm_map.c:4530 uvm_io(fffffd806c890e78,ffff80002e36ee78,0) at uvm_io+0x127 sys/uvm/uvm_io.c:100 sysctl_proc_args(ffff80002e36f2c8,2,20000080,ffff80002e36f2f8,ffff800023066010) at sysctl_proc_args+0x24b sys/kern/kern_sysctl.c:1790 kern_sysctl(ffff80002e36f2c4,3,20000080,ffff80002e36f2f8,0,0,ecc46cb54337c858) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff800023066010,ffff80002e36f368,ffff80002e36f3c0) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff80002e36f430) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e36f430) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6b3d7fae560, count: 3 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: share->excl ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8257690f) at panic+0x177 sys/kern/subr_prf.c:202 witness_checkorder(fffffd806c890e90,9,0) at witness_checkorder+0x11bd witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_checkorder(fffffd806c890e90,9,0) at witness_checkorder+0x11bd sys/kern/subr_witness.c:772 rw_enter(fffffd806c890e80,21) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 vm_map_lock_ln(fffffd806c890e78,42d,ffff800024674000) at vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5466 uvm_map_extract(fffffd806c890e78,7f7ffffc3000,1000,ffff80002e36ede0,0) at uvm_map_extract+0x173 sys/uvm/uvm_map.c:4530 uvm_io(fffffd806c890e78,ffff80002e36ee78,0) at uvm_io+0x127 sys/uvm/uvm_io.c:100 sysctl_proc_args(ffff80002e36f2c8,2,20000080,ffff80002e36f2f8,ffff800023066010) at sysctl_proc_args+0x24b sys/kern/kern_sysctl.c:1790 kern_sysctl(ffff80002e36f2c4,3,20000080,ffff80002e36f2f8,0,0,ecc46cb54337c858) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff800023066010,ffff80002e36f368,ffff80002e36f3c0) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff80002e36f430) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e36f430) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6b3d7fae560, count: -12 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002e36ea40 rbx 0xffffffff829bbbff cpu_info_full_primary+0x2bff rdx 0xffff800000bc8600 rcx 0 rax 0xffff800023066010 r8 0x101010101010101 r9 0x8080808080808080 r10 0x109b630d8bc0da7f r11 0xf7e731c78a636ac1 r12 0xffffffff829bba00 cpu_info_full_primary+0x2a00 r13 0 r14 0 r15 0x1 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e36ea30 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.2) pid=104622 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800023067270,0xffff800023066aa0 process=0xffff80002950add8 user=0xffff80002e36a000, vmspace=0xfffffd806c890e78 estcpu=0, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 82662 313396 30669 32767 2 0x10 syz-executor.3 82662 155620 30669 32767 2 0x4000010 syz-executor.3 38577 210346 79563 32767 2 0x10 syz-executor.5 38577 390356 79563 32767 3 0x4000090 fsleep syz-executor.5 9781 40303 66991 32767 2 0x10 syz-executor.4 9781 43519 66991 32767 2 0x4000010 syz-executor.4 39129 151490 22244 32767 2 0x10 syz-executor.6 39129 431530 22244 32767 3 0x4000090 fsleep syz-executor.6 69148 270547 87737 32767 7 0x10 syz-executor.2 *69148 104622 87737 32767 7 0x4000010 syz-executor.2 29530 283650 57778 32767 2 0x10 syz-executor.0 29530 352664 57778 32767 2 0x4000010 syz-executor.0 52901 155583 40840 32767 2 0x10 syz-executor.1 22244 118408 35787 32767 2 0x10 syz-executor.6 72301 302453 17516 32767 3 0x90 piperd syz-executor.7 17516 271863 59568 0 3 0x82 wait syz-executor.7 79563 259302 63097 32767 3 0x90 nanoslp syz-executor.5 35787 91227 59568 0 3 0x82 wait syz-executor.6 66991 224783 32169 32767 2 0x10 syz-executor.4 63097 342310 59568 0 3 0x82 wait syz-executor.5 30669 163152 93531 32767 3 0x90 nanoslp syz-executor.3 32169 21633 59568 0 3 0x82 wait syz-executor.4 87737 216828 32218 32767 2 0x10 syz-executor.2 93531 38274 59568 0 3 0x82 wait syz-executor.3 40840 481262 83553 32767 2 0x10 syz-executor.1 32218 187221 59568 0 3 0x82 wait syz-executor.2 83553 246953 59568 0 3 0x82 wait syz-executor.1 57778 12299 38772 32767 3 0x90 nanoslp syz-executor.0 38772 268034 59568 0 3 0x82 wait syz-executor.0 59568 405405 42781 0 3 0x82 thrsleep syz-fuzzer 59568 83595 42781 0 2 0x4000002 syz-fuzzer 59568 89890 42781 0 3 0x4000082 thrsleep syz-fuzzer 59568 508266 42781 0 3 0x4000082 thrsleep syz-fuzzer 59568 14596 42781 0 3 0x4000082 thrsleep syz-fuzzer 59568 345498 42781 0 3 0x4000082 thrsleep syz-fuzzer 59568 34412 42781 0 2 0x4000002 syz-fuzzer 59568 272283 42781 0 3 0x4000082 thrsleep syz-fuzzer 59568 274633 42781 0 3 0x4000082 thrsleep syz-fuzzer 42781 105245 11554 0 3 0x10008a sigsusp ksh 11554 67716 81534 0 3 0x9a kqread sshd 52705 357601 1 0 3 0x100083 ttyin getty 81534 223829 1 0 3 0x88 kqread sshd 88127 277126 64265 73 3 0x1100090 kqread syslogd 64265 476477 1 0 3 0x100082 netio syslogd 11907 482688 1 0 3 0x100080 kqread resolvd 55485 31688 46005 77 3 0x100092 kqread dhcpleased 50658 155415 46005 77 3 0x100092 kqread dhcpleased 46005 459969 1 0 3 0x80 kqread dhcpleased 67389 302558 0 0 3 0x14200 bored smr 80783 513436 0 0 2 0x14200 zerothread 99874 208644 0 0 3 0x14200 aiodoned aiodoned 32726 260118 0 0 3 0x14200 syncer update 87507 235711 0 0 3 0x14200 cleaner cleaner 27332 430757 0 0 3 0x14200 reaper reaper 69659 282649 0 0 3 0x14200 pgdaemon pagedaemon 76936 70832 0 0 3 0x14200 bored viomb 55820 444160 0 0 3 0x40014200 acpi0 acpi0 88204 160394 0 0 3 0x40014200 idle1 94765 461652 0 0 3 0x14200 bored softnet 15267 232558 0 0 3 0x14200 bored systqmp 83379 144893 0 0 3 0x14200 bored systq 15234 140387 0 0 3 0x40014200 bored softclock 83771 263465 0 0 3 0x40014200 idle0 1 356784 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 69148 (syz-executor.2) thread 0xffff800023066010 (104622) shared rwlock vmmaplk r = 0 (0xfffffd806c890e90) #0 witness_lock+0x44d #1 uvm_vslock+0xc8 sys/uvm/uvm_glue.c:129 #2 sys_sysctl+0x2d8 sys/kern/kern_sysctl.c:240 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 exclusive rwlock sysctllk r = 0 (0xffffffff82941f10) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 sys_sysctl+0x1b3 sys/kern/kern_sysctl.c:233 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829de988) #0 witness_lock+0x44d #1 syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10171 6407K 6419K 78643K 11261 0 pcb 13 8K 8K 78643K 13 0 rtable 238 6K 7K 78643K 348 0 ifaddr 81 16K 16K 78643K 82 0 counters 56 35K 35K 78643K 56 0 ioctlops 0 0K 2K 78643K 33 0 iov 0 0K 12K 78643K 7 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1270 79K 79K 78643K 1285 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 15 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 25 93K 113K 78643K 233 0 proc 56 74K 99K 78643K 454 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 19 0 in_multi 99 6K 6K 78643K 105 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 49 228K 228K 78643K 49 0 exec 0 0K 2K 78643K 609 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 323 79K 79K 78643K 4088 0 UVM aobj 4 2K 2K 78643K 4 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 3 0 NDP 11 0K 2K 78643K 27 0 temp 86 4697K 4757K 78643K 4384 0 kqueue 12 18K 20K 78643K 31 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 33 0 30 1 0 1 1 0 8 0 rtentry 112 111 0 1 4 0 4 4 0 8 0 unpcb 136 39 0 22 1 0 1 1 0 8 0 syncache 296 10 0 10 1 0 1 1 0 8 1 tcpqe 32 281 0 281 1 0 1 1 0 8 1 tcpcb 736 44 0 30 3 0 3 3 0 8 0 arp 120 18 0 0 1 0 1 1 0 8 0 inpcb 304 124 0 112 2 0 2 2 0 8 0 nd6 48 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 453 0 0 29 0 29 29 0 8 0 art_table 32 454 0 0 4 0 4 4 0 8 0 art_node 16 110 0 10 1 0 1 1 0 8 0 semupl 112 5 0 5 1 0 1 1 0 8 1 semapl 112 13 0 3 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1580 0 152 90 0 90 90 0 8 0 ffsino 272 1580 0 152 96 0 96 96 0 8 0 nchpl 144 1929 0 269 62 0 62 62 0 8 0 uvmvnodes 80 1693 0 0 35 0 35 35 0 8 0 vnodes 224 1693 0 0 100 0 100 100 0 8 0 namei 1024 6234 0 6234 2 0 2 2 0 8 2 percpumem 16 40 0 0 1 0 1 1 0 8 0 scxspl 216 6150 0 6150 4 1 3 3 0 8 3 plimitpl 152 35 0 12 1 0 1 1 0 8 0 sigapl 424 506 0 456 7 0 7 7 0 8 0 futexpl 64 556 0 554 1 0 1 1 0 8 0 knotepl 120 104 0 0 4 0 4 4 0 8 0 kqueuepl 216 36 0 28 1 0 1 1 0 8 0 pipepl 336 125 0 97 3 0 3 3 0 8 0 fdescpl 496 492 0 456 7 1 6 6 0 8 0 filepl 152 1731 0 1493 10 0 10 10 0 8 0 lockfpl 104 14 0 12 1 0 1 1 0 8 0 lockfspl 48 8 0 6 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 23 0 7 1 0 1 1 0 8 0 ucredpl 96 133 0 115 1 0 1 1 0 8 0 zombiepl 144 456 0 456 1 0 1 1 0 8 1 processpl 1064 506 0 456 5 1 4 4 0 8 0 procpl 672 615 0 551 6 0 6 6 0 8 0 sockpl 480 196 0 164 5 0 5 5 0 8 1 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 156 0 0 19 0 19 19 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 294 0 0 18 0 18 18 0 8 0 bufpl 288 3883 0 144 268 0 268 268 0 8 0 anonpl 24 86923 0 74560 78 1 77 77 0 186 0 amapchunkpl 152 8719 0 7940 32 1 31 31 0 158 1 amappl16 200 696 0 395 18 1 17 17 0 8 1 amappl15 192 106 0 98 1 0 1 1 0 8 0 amappl14 184 21 0 18 1 0 1 1 0 8 0 amappl13 176 90 0 88 1 0 1 1 0 8 0 amappl12 168 36 0 33 1 0 1 1 0 8 0 amappl11 160 61 0 47 1 0 1 1 0 8 0 amappl10 152 93 0 83 1 0 1 1 0 8 0 amappl9 144 481 0 476 1 0 1 1 0 8 0 amappl8 136 537 0 496 2 0 2 2 0 8 0 amappl7 128 117 0 106 1 0 1 1 0 8 0 amappl6 120 205 0 182 2 0 2 2 0 8 1 amappl5 112 326 0 295 1 0 1 1 0 8 0 amappl4 104 795 0 768 2 0 2 2 0 8 1 amappl3 96 193 0 180 1 0 1 1 0 8 0 amappl2 88 503 0 460 3 0 3 3 0 8 1 amappl1 80 11735 0 11093 18 1 17 18 0 8 3 amappl 88 3665 0 3404 7 0 7 7 0 92 1 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 492 0 456 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 492 0 456 1 0 1 1 0 8 0 vmmpekpl 168 8139 0 8092 3 0 3 3 0 8 0 vmmpepl 168 47541 0 44963 117 0 117 117 0 357 2 vmsppl 368 491 0 456 4 0 4 4 0 8 0 rwobjpl 56 13938 0 11015 42 0 42 42 0 8 0 pdppl 4096 991 0 912 101 20 81 89 0 8 2 pvpl 32 284416 0 266950 252 0 252 252 0 265 111 pmappl 248 491 0 456 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 644 0 22 18 0 18 18 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(ffffffff8257690f) at panic+0x177 sys/kern/subr_prf.c:202 witness_checkorder(fffffd806c890e90,9,0) at witness_checkorder+0x11bd witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_checkorder(fffffd806c890e90,9,0) at witness_checkorder+0x11bd sys/kern/subr_witness.c:772 rw_enter(fffffd806c890e80,21) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 vm_map_lock_ln(fffffd806c890e78,42d,ffff800024674000) at vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5466 uvm_map_extract(fffffd806c890e78,7f7ffffc3000,1000,ffff80002e36ede0,0) at uvm_map_extract+0x173 sys/uvm/uvm_map.c:4530 uvm_io(fffffd806c890e78,ffff80002e36ee78,0) at uvm_io+0x127 sys/uvm/uvm_io.c:100 sysctl_proc_args(ffff80002e36f2c8,2,20000080,ffff80002e36f2f8,ffff800023066010) at sysctl_proc_args+0x24b sys/kern/kern_sysctl.c:1790 kern_sysctl(ffff80002e36f2c4,3,20000080,ffff80002e36f2f8,0,0,ecc46cb54337c858) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff800023066010,ffff80002e36f368,ffff80002e36f3c0) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff80002e36f430) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e36f430) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6b3d7fae560, count: -12 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020ce8ff0) 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 end of kernel end trace frame: 0x7f7ffffc2780, count: 12 ddb{1}> trace x86_ipi_db(ffff800020ce8ff0) 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 end of kernel end trace frame: 0x7f7ffffc2780, count: -3