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 *113695 65708 0 0x2 0 0K syz-executor3957314175 169270 17344 0 0x12 0 1 sshd 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(fffffd800872ea28,9,0) at witness_checkorder+0x11bd witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_checkorder(fffffd800872ea28,9,0) at witness_checkorder+0x11bd sys/kern/subr_witness.c:772 rw_enter(fffffd800872ea18,21) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 vm_map_lock_ln(fffffd800872ea10,0,1000) at vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5466 uvm_map_extract(fffffd800872ea10,7f7ffffd1000,1000,ffff8000211c1a30,0) at uvm_map_extract+0x173 sys/uvm/uvm_map.c:4530 uvm_io(fffffd800872ea10,ffff8000211c1ac8,0) at uvm_io+0x127 sys/uvm/uvm_io.c:100 sysctl_proc_args(ffff8000211c1f18,2,20000080,ffff8000211c1f48,ffff8000ffff6010) at sysctl_proc_args+0x24b sys/kern/kern_sysctl.c:1790 kern_sysctl(ffff8000211c1f14,3,20000080,ffff8000211c1f48,0,0,99898603ac1efdc2) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff8000ffff6010,ffff8000211c1fb8,ffff8000211c2010) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff8000211c2080) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000211c2080) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd1140, 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(fffffd800872ea28,9,0) at witness_checkorder+0x11bd witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_checkorder(fffffd800872ea28,9,0) at witness_checkorder+0x11bd sys/kern/subr_witness.c:772 rw_enter(fffffd800872ea18,21) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 vm_map_lock_ln(fffffd800872ea10,0,1000) at vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5466 uvm_map_extract(fffffd800872ea10,7f7ffffd1000,1000,ffff8000211c1a30,0) at uvm_map_extract+0x173 sys/uvm/uvm_map.c:4530 uvm_io(fffffd800872ea10,ffff8000211c1ac8,0) at uvm_io+0x127 sys/uvm/uvm_io.c:100 sysctl_proc_args(ffff8000211c1f18,2,20000080,ffff8000211c1f48,ffff8000ffff6010) at sysctl_proc_args+0x24b sys/kern/kern_sysctl.c:1790 kern_sysctl(ffff8000211c1f14,3,20000080,ffff8000211c1f48,0,0,99898603ac1efdc2) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff8000ffff6010,ffff8000211c1fb8,ffff8000211c2010) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff8000211c2080) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000211c2080) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd1140, count: -12 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000211c1690 rbx 0xffffffff829bbbff cpu_info_full_primary+0x2bff rdx 0x3fd rcx 0 rax 0x13 r8 0x101010101010101 r9 0x8080808080808080 r10 0xee9c8df8b92c7d45 r11 0xaccdb1dc1d9c1e9a r12 0xffffffff829bba00 cpu_info_full_primary+0x2a00 r13 0 r14 0 r15 0x1 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000211c1680 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor3957314175) pid=113695 stat=onproc flags process=2 proc=0 pri=50, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff62b0,0xffffffff82b3d400 process=0xffff80002116c438 user=0xffff8000211bd000, vmspace=0xfffffd800872ea10 estcpu=0, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *65708 113695 69200 0 7 0x2 syz-executor3957314175 69200 115287 17344 0 3 0x10008a sigsusp ksh 17344 169270 83724 0 7 0x12 sshd 38883 403732 1 0 3 0x100083 ttyin getty 83724 54595 1 0 3 0x88 kqread sshd 4896 306634 963 73 3 0x1100090 kqread syslogd 963 290255 1 0 3 0x100082 netio syslogd 82198 131956 1 0 3 0x100080 kqread resolvd 18661 67631 12859 77 3 0x100092 kqread dhcpleased 25981 113973 12859 77 3 0x100092 kqread dhcpleased 12859 21825 1 0 3 0x80 kqread dhcpleased 35955 75859 0 0 3 0x14200 bored smr 55522 276782 0 0 3 0x14200 pgzero zerothread 62851 429170 0 0 3 0x14200 aiodoned aiodoned 82567 471426 0 0 3 0x14200 syncer update 1485 303103 0 0 3 0x14200 cleaner cleaner 54862 504650 0 0 3 0x14200 reaper reaper 57179 481675 0 0 3 0x14200 pgdaemon pagedaemon 33486 417824 0 0 3 0x14200 bored viomb 83474 446767 0 0 3 0x40014200 acpi0 acpi0 57898 495666 0 0 3 0x40014200 idle1 56159 132700 0 0 2 0x14200 softnet 78181 399224 0 0 3 0x14200 bored systqmp 77151 414230 0 0 3 0x14200 bored systq 29647 197939 0 0 3 0x40014200 bored softclock 82445 508504 0 0 3 0x40014200 idle0 1 165338 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 65708 (syz-executor3957314175) thread 0xffff8000ffff6010 (113695) shared rwlock vmmaplk r = 0 (0xfffffd800872ea28) #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 10143 6388K 6419K 78643K 11233 0 pcb 13 8K 8K 78643K 13 0 rtable 62 2K 2K 78643K 108 0 ifaddr 24 7K 7K 78643K 24 0 counters 40 33K 33K 78643K 40 0 ioctlops 0 0K 2K 78643K 25 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1166 73K 73K 78643K 1179 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 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 1 0K 0K 78643K 1 0 proc 55 74K 75K 78643K 226 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 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 25 122K 122K 78643K 25 0 exec 0 0K 2K 78643K 391 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 73 3K 5K 78643K 1951 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 3 0K 0K 78643K 3 0 temp 20 4694K 4753K 78643K 3051 0 kqueue 11 16K 18K 78643K 24 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 17 0 14 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 136 35 0 20 1 0 1 1 0 8 0 syncache 296 5 0 5 2 1 1 1 0 8 1 tcpcb 736 8 0 5 1 0 1 1 0 8 0 arp 120 2 0 0 1 0 1 1 0 8 0 inpcb 304 25 0 19 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1415 0 38 87 0 87 87 0 8 0 ffsino 272 1415 0 38 92 0 92 92 0 8 0 nchpl 144 1590 0 47 58 0 58 58 0 8 0 uvmvnodes 80 1424 0 0 30 0 30 30 0 8 0 vnodes 224 1424 0 0 84 0 84 84 0 8 0 namei 1024 4131 0 4131 2 1 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 scxspl 216 3770 0 3770 2 1 1 2 0 8 1 plimitpl 152 15 0 9 1 0 1 1 0 8 0 sigapl 424 292 0 265 4 0 4 4 0 8 0 knotepl 120 42 0 0 2 0 2 2 0 8 0 kqueuepl 216 20 0 13 1 0 1 1 0 8 0 pipepl 336 79 0 76 2 1 1 1 0 8 0 fdescpl 496 278 0 265 3 0 3 3 0 8 0 filepl 152 1012 0 957 3 0 3 3 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 96 64 0 54 1 0 1 1 0 8 0 zombiepl 144 265 0 265 2 1 1 1 0 8 1 processpl 1064 292 0 265 3 0 3 3 0 8 0 procpl 672 292 0 265 3 0 3 3 0 8 0 sockpl 480 77 0 53 4 1 3 4 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 64 0 0 8 0 8 8 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 104 0 0 7 0 7 7 0 8 0 bufpl 288 1935 0 86 133 0 133 133 0 8 0 anonpl 24 37988 0 35943 16 2 14 16 0 186 0 amapchunkpl 152 3606 0 3479 7 1 6 7 0 158 0 amappl16 200 27 0 26 2 1 1 1 0 8 0 amappl15 192 59 0 56 1 0 1 1 0 8 0 amappl13 176 32 0 31 2 1 1 1 0 8 0 amappl12 168 15 0 15 2 1 1 1 0 8 1 amappl11 160 46 0 36 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 447 0 445 1 0 1 1 0 8 0 amappl8 136 339 0 336 1 0 1 1 0 8 0 amappl7 128 60 0 57 1 0 1 1 0 8 0 amappl6 120 107 0 94 1 0 1 1 0 8 0 amappl5 112 163 0 154 1 0 1 1 0 8 0 amappl4 104 578 0 559 1 0 1 1 0 8 0 amappl3 96 113 0 103 1 0 1 1 0 8 0 amappl2 88 336 0 300 1 0 1 1 0 8 0 amappl1 80 8123 0 7772 11 2 9 10 0 8 0 amappl 88 1698 0 1641 2 0 2 2 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 278 0 265 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 278 0 265 1 0 1 1 0 8 0 vmmpekpl 168 5892 0 5877 1 0 1 1 0 8 0 vmmpepl 168 24484 0 23723 46 8 38 45 0 357 1 vmsppl 368 277 0 265 2 0 2 2 0 8 0 rwobjpl 56 8932 0 7000 29 0 29 29 0 8 1 pdppl 4096 563 0 530 52 19 33 45 0 8 0 pvpl 32 123211 0 119421 42 8 34 42 0 265 0 pmappl 248 277 0 265 2 1 1 2 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 401 0 23 11 0 11 11 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(fffffd800872ea28,9,0) at witness_checkorder+0x11bd witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_checkorder(fffffd800872ea28,9,0) at witness_checkorder+0x11bd sys/kern/subr_witness.c:772 rw_enter(fffffd800872ea18,21) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 vm_map_lock_ln(fffffd800872ea10,0,1000) at vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5466 uvm_map_extract(fffffd800872ea10,7f7ffffd1000,1000,ffff8000211c1a30,0) at uvm_map_extract+0x173 sys/uvm/uvm_map.c:4530 uvm_io(fffffd800872ea10,ffff8000211c1ac8,0) at uvm_io+0x127 sys/uvm/uvm_io.c:100 sysctl_proc_args(ffff8000211c1f18,2,20000080,ffff8000211c1f48,ffff8000ffff6010) at sysctl_proc_args+0x24b sys/kern/kern_sysctl.c:1790 kern_sysctl(ffff8000211c1f14,3,20000080,ffff8000211c1f48,0,0,99898603ac1efdc2) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff8000ffff6010,ffff8000211c1fb8,ffff8000211c2010) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff8000211c2080) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000211c2080) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd1140, 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 __mp_lock(ffffffff829de780) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff800021180860) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff800021180860) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffba050, count: 9 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 __mp_lock(ffffffff829de780) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff800021180860) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff800021180860) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffba050, count: -6 ddb{1}>