panic: vmmaplk: lock not shared Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 272167 86181 0 0 0x4000000 0 syz-executor5349 *458595 86181 0 0 0x4000000 1K syz-executor5349 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x16c sys/kern/subr_prf.c:208 _rw_exit_read(ffff800020be4268,2a4,ffff800020c3b9b8) at _rw_exit_read+0x12b sys/kern/kern_rwlock.c:355 uvm_fault(b139956407eb0b2,ffff800020be4268,0,ffffffff8167c690) at uvm_fault+0x23bb uvmfault_unlockall sys/uvm/uvm_fault.c:1388 [inline] uvm_fault(b139956407eb0b2,ffff800020be4268,0,ffffffff8167c690) at uvm_fault+0x23bb sys/uvm/uvm_fault.c:1266 pageflttrap() at pageflttrap+0x216 sys/arch/amd64/amd64/trap.c:200 kerntrap(32c9c977baf18ce4) at kerntrap+0xeb sys/arch/amd64/amd64/trap.c:294 alltraps_kern(6,14,c014575e,0,fffffd807a9f0980,20000000) at alltraps_kern+0x7b copyin(ac266adfd581996c,0,ffff800020be4268,da98e9b5b78,0,360) at copyin+0x4b syscall(d47e3fa3a6c3d5de) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(d47e3fa3a6c3d5de) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,da722aec170,0,da722aec150,da722aec148) at Xsyscall+0x128 end of kernel end trace frame: 0xda98e9b5b90, count: 5 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{1}> ddb{1}> set $lines = 0 ddb{1}> show panic vmmaplk: lock not shared ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x16c sys/kern/subr_prf.c:208 _rw_exit_read(ffff800020be4268,2a4,ffff800020c3b9b8) at _rw_exit_read+0x12b sys/kern/kern_rwlock.c:355 uvm_fault(b139956407eb0b2,ffff800020be4268,0,ffffffff8167c690) at uvm_fault+0x23bb uvmfault_unlockall sys/uvm/uvm_fault.c:1388 [inline] uvm_fault(b139956407eb0b2,ffff800020be4268,0,ffffffff8167c690) at uvm_fault+0x23bb sys/uvm/uvm_fault.c:1266 pageflttrap() at pageflttrap+0x216 sys/arch/amd64/amd64/trap.c:200 kerntrap(32c9c977baf18ce4) at kerntrap+0xeb sys/arch/amd64/amd64/trap.c:294 alltraps_kern(6,14,c014575e,0,fffffd807a9f0980,20000000) at alltraps_kern+0x7b copyin(ac266adfd581996c,0,ffff800020be4268,da98e9b5b78,0,360) at copyin+0x4b syscall(d47e3fa3a6c3d5de) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(d47e3fa3a6c3d5de) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,da722aec170,0,da722aec150,da722aec148) at Xsyscall+0x128 end of kernel end trace frame: 0xda98e9b5b90, count: -10 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020c3b820 rbx 0xffff800020c3b8c0 rdx 0xffffffff81f323f3 cy_pio_rec+0x25c rcx 0x201 rax 0x1 r8 0xffffffff81d8b924 kprintf+0x174 r9 0x1 r10 0xbf460727fd0673bd r11 0xc5a383bfe0fcfa68 r12 0x3000000008 r13 0xffff800020c3b830 r14 0x100 r15 0x1 rip 0xffffffff81202148 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c3b810 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor5349) pid=458595 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020b759d0,0xffffffff822f0c88 process=0xffff800020bca9f0 user=0xffff800020c36000, vmspace=0xfffffd806e929440 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 86181 324693 16851 0 2 0 syz-executor5349 86181 265288 16851 0 3 0x4000080 fsleep syz-executor5349 86181 272167 16851 0 7 0x4000000 syz-executor5349 86181 335292 16851 0 3 0x4000080 fsleep syz-executor5349 *86181 458595 16851 0 7 0x4000000 syz-executor5349 95573 292941 16164 0 3 0x80 nanosleep syz-executor5349 95573 410965 16164 0 3 0x4000080 fsleep syz-executor5349 95573 90381 16164 0 3 0x4000080 fsleep syz-executor5349 16851 467787 93284 0 3 0x80 nanosleep syz-executor5349 16164 230987 93284 0 3 0x80 nanosleep syz-executor5349 93284 317182 41067 0 3 0x82 nanosleep syz-executor5349 41067 435881 25486 0 3 0x10008a pause ksh 25486 446325 10014 0 3 0x92 select sshd 85512 36591 1 0 3 0x100083 ttyin getty 10014 370123 1 0 3 0x80 select sshd 26336 40635 53338 73 3 0x100090 kqread syslogd 53338 200128 1 0 3 0x100082 netio syslogd 2416 217780 1 77 3 0x100090 poll dhclient 11796 283976 1 0 3 0x80 poll dhclient 43079 62033 0 0 3 0x14200 pgzero zerothread 85179 220332 0 0 3 0x14200 aiodoned aiodoned 72486 399641 0 0 3 0x14200 syncer update 60697 441444 0 0 3 0x14200 cleaner cleaner 14001 523589 0 0 3 0x14200 reaper reaper 411 288416 0 0 3 0x14200 pgdaemon pagedaemon 74030 415480 0 0 3 0x14200 bored crynlk 36538 39048 0 0 3 0x14200 bored crypto 87340 416537 0 0 3 0x40014200 acpi0 acpi0 78219 52430 0 0 3 0x40014200 idle1 10023 7576 0 0 3 0x14200 bored softnet 13739 419554 0 0 3 0x14200 bored systqmp 32048 216604 0 0 3 0x14200 bored systq 24376 521205 0 0 3 0x40014200 bored softclock 877 404101 0 0 3 0x40014200 idle0 1 477967 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 86181 (syz-executor5349) thread 0xffff800020be4268 (458595) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff823166a8) locked @ /syzkaller/managers/multicore/kernel/sys/kern/sched_bsd.c:436 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9442 6315K 6316K 78643K 10529 0 0 pcb 23 9K 9K 78643K 55 0 0 rtable 61 2K 2K 78643K 115 0 0 ifaddr 21 7K 7K 78643K 21 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 13 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1168 73K 73K 78643K 1221 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 2 0K 0K 78643K 2 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 1 0K 0K 78643K 1 0 0 proc 40 38K 46K 78643K 201 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 in_multi 11 0K 0K 78643K 11 0 0 ether_multi 1 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 18 79K 79K 78643K 18 0 0 exec 0 0K 1K 78643K 149 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 65 19K 19K 78643K 811 0 0 UVM aobj 2 2K 2K 78643K 2 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 NDP 3 0K 0K 78643K 3 0 0 temp 30 2347K 2411K 78643K 1756 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 2 0 0 1 0 1 1 0 8 0 inpcbpl 280 92 0 82 1 0 1 1 0 8 0 plimitpl 152 15 0 8 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 syncache 264 5 0 5 2 1 1 1 0 8 1 tcpcb 544 78 0 71 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 dino1pl 128 1503 0 132 45 0 45 45 0 8 0 ffsino 272 1503 0 132 92 0 92 92 0 8 0 nchpl 144 1710 0 179 57 0 57 57 0 8 0 uvmvnodes 72 1512 0 0 28 0 28 28 0 8 0 vnodes 200 1512 0 0 80 0 80 80 0 8 0 namei 1024 3603 0 3603 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 2746 0 2746 8 2 6 6 0 8 6 sigapl 432 210 0 196 2 0 2 2 0 8 0 futexpl 56 238 0 234 1 0 1 1 0 8 0 knotepl 112 5 0 0 1 0 1 1 0 8 0 kqueuepl 104 1 0 0 1 0 1 1 0 8 0 pipepl 112 114 0 107 2 1 1 1 0 8 0 fdescpl 488 211 0 196 2 0 2 2 0 8 0 filepl 152 980 0 932 2 0 2 2 0 8 0 lockfpl 104 6 0 6 1 1 0 1 0 8 0 lockfspl 32 3 0 3 1 1 0 1 0 8 0 sessionpl 112 19 0 9 1 0 1 1 0 8 0 pgrppl 48 19 0 9 1 0 1 1 0 8 0 ucredpl 96 47 0 40 1 0 1 1 0 8 0 zombiepl 144 196 0 196 2 1 1 1 0 8 1 processpl 840 225 0 196 4 0 4 4 0 8 0 procpl 600 297 0 262 3 0 3 3 0 8 0 sockpl 384 134 0 114 3 0 3 3 0 8 1 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 73 0 0 9 0 9 9 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 92 0 0 6 0 6 6 0 8 0 bufpl 256 2052 0 261 112 0 112 112 0 8 0 anonpl 16 19336 0 18076 7 1 6 6 0 125 0 amapchunkpl 152 700 0 649 2 0 2 2 0 158 0 amappl16 192 146 0 132 1 0 1 1 0 8 0 amappl15 184 1 0 1 1 1 0 1 0 8 0 amappl14 176 1 0 1 1 1 0 1 0 8 0 amappl13 168 16 0 13 1 0 1 1 0 8 0 amappl12 160 8 0 8 2 1 1 1 0 8 1 amappl11 152 171 0 162 1 0 1 1 0 8 0 amappl10 144 43 0 43 2 1 1 1 0 8 1 amappl9 136 207 0 206 1 0 1 1 0 8 0 amappl8 128 110 0 100 1 0 1 1 0 8 0 amappl7 120 31 0 26 1 0 1 1 0 8 0 amappl6 112 42 0 38 1 0 1 1 0 8 0 amappl5 104 169 0 157 1 0 1 1 0 8 0 amappl4 96 254 0 233 1 0 1 1 0 8 0 amappl3 88 113 0 107 1 0 1 1 0 8 0 amappl2 80 883 0 826 2 0 2 2 0 8 0 amappl1 72 12588 0 12124 15 5 10 15 0 8 0 amappl 72 485 0 454 1 0 1 1 0 75 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma64 64 259 0 259 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 17 0 17 1 1 0 1 0 8 0 aobjpl 64 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 211 0 196 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 211 0 196 1 0 1 1 0 8 0 vmmpekpl 168 5334 0 5314 2 0 2 2 0 8 0 vmmpepl 168 26306 0 25390 55 15 40 43 0 357 0 vmsppl 360 210 0 196 2 0 2 2 0 8 0 pdppl 4096 429 0 392 5 0 5 5 0 8 0 pvpl 32 74702 0 71623 32 6 26 26 0 265 1 pmappl 224 210 0 196 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 240 0 3 7 0 7 7 0 8 0 ddb{1}>