login: witness: userret: returning with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd806e360d58) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:561 #5 spec_open+0x431 sys/kern/spec_vnops.c:159 #6 VOP_OPEN+0x6a sys/kern/vfs_vops.c:153 #7 vn_open+0x495 sys/kern/vfs_vnops.c:174 #8 sys_ktrace+0x86 sys/kern/kern_ktrace.c:517 #9 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #9 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #10 Xsyscall+0x128 panic: witness_warn Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *161396 85050 0 0 0x4000000 1 syz-executor.0 285894 66631 73 0x100010 0 0K syslogd db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 witness_warn(2,0,ffffffff8220d283) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff8220d283) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020abfb40) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800021b6f7b0) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800021b6f7b0) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,d,ffffffffffffff82,0,4,2c0eef02010) at Xsyscall+0x128 end of kernel end trace frame: 0x2c2ef970ed0, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic witness_warn ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 witness_warn(2,0,ffffffff8220d283) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff8220d283) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020abfb40) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800021b6f7b0) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800021b6f7b0) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,d,ffffffffffffff82,0,4,2c0eef02010) at Xsyscall+0x128 end of kernel end trace frame: 0x2c2ef970ed0, count: -6 ddb{1}> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800021b6f4f0 rbx 0xffff800021b6f5a0 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800020b60000 rax 0xffff800000a45000 r8 0xffffffff812e94e3 kprintf+0x173 r9 0x1 r10 0x25 r11 0x52823b5174224b6 r12 0x3000000008 r13 0xffff800021b6f500 r14 0x100 r15 0x1 rip 0xffffffff81d56a38 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021b6f4e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=161396 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff800020abf3d8,0xffff800020abf660 process=0xffff800020a8aa90 user=0xffff800021b6a000, vmspace=0xfffffd807f00b8a0 estcpu=31, cpticks=4, pctcpu=0.0 user=0, sys=4, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 85050 32322 97033 0 3 0x80 nanosleep syz-executor.0 *85050 161396 97033 0 7 0x4000000 syz-executor.0 85050 30942 97033 0 3 0x4000080 fsleep syz-executor.0 85050 110634 97033 0 3 0x4000080 fsleep syz-executor.0 92396 473211 83953 0 3 0x80 nanosleep syz-executor.1 92396 445828 83953 0 3 0x4000080 nanosleep syz-executor.1 92396 359906 83953 0 3 0x4000080 nanosleep syz-executor.1 92396 298799 83953 0 3 0x4000080 fsleep syz-executor.1 53898 362348 1 0 3 0x100083 ttyin getty 13274 316900 0 0 3 0x14200 bored sosplice 83953 388320 83286 0 3 0x82 nanosleep syz-executor.1 97033 103883 83286 0 3 0x82 nanosleep syz-executor.0 83286 490601 29372 0 3 0x82 thrsleep syz-fuzzer 83286 21412 29372 0 3 0x4000082 thrsleep syz-fuzzer 83286 509572 29372 0 3 0x4000082 thrsleep syz-fuzzer 83286 92469 29372 0 3 0x4000082 thrsleep syz-fuzzer 83286 162047 29372 0 3 0x4000082 thrsleep syz-fuzzer 83286 105894 29372 0 3 0x4000082 thrsleep syz-fuzzer 83286 369745 29372 0 3 0x4000082 thrsleep syz-fuzzer 83286 227945 29372 0 3 0x4000082 thrsleep syz-fuzzer 83286 108177 29372 0 3 0x4000082 thrsleep syz-fuzzer 83286 323274 29372 0 3 0x4000082 kqread syz-fuzzer 29372 478982 85165 0 3 0x10008a pause ksh 85165 285527 36334 0 3 0x92 select sshd 36334 254475 1 0 3 0x80 select sshd 14802 2135 45482 74 3 0x100092 bpf pflogd 45482 200487 1 0 3 0x80 netio pflogd 66631 285894 68296 73 7 0x100010 syslogd 68296 180623 1 0 3 0x100082 netio syslogd 98155 156277 1 77 3 0x100090 poll dhclient 92302 352059 1 0 3 0x80 poll dhclient 95638 415698 0 0 3 0x14200 pgzero zerothread 79960 422826 0 0 3 0x14200 aiodoned aiodoned 8917 60768 0 0 3 0x14200 syncer update 76616 341115 0 0 3 0x14200 cleaner cleaner 51290 265224 0 0 3 0x14200 reaper reaper 47578 52962 0 0 3 0x14200 pgdaemon pagedaemon 56234 102256 0 0 3 0x14200 bored crynlk 93008 496669 0 0 3 0x14200 bored crypto 42057 215044 0 0 3 0x40014200 acpi0 acpi0 95469 55804 0 0 3 0x40014200 idle1 63164 165080 0 0 3 0x14200 bored softnet 70461 55323 0 0 3 0x14200 bored systqmp 60484 433434 0 0 3 0x14200 bored systq 50174 216648 0 0 3 0x40014200 bored softclock 63588 39734 0 0 3 0x40014200 idle0 53006 364307 0 0 3 0x14200 bored smr 1 516069 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 85050 (syz-executor.0) thread 0xffff800020abfb40 (161396) exclusive rrwlock inode r = 0 (0xfffffd806e360d58) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:561 #5 spec_open+0x431 sys/kern/spec_vnops.c:159 #6 VOP_OPEN+0x6a sys/kern/vfs_vops.c:153 #7 vn_open+0x495 sys/kern/vfs_vnops.c:174 #8 sys_ktrace+0x86 sys/kern/kern_ktrace.c:517 #9 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #9 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #10 Xsyscall+0x128 Process 66631 (syslogd) thread 0xffff800020ac09f0 (285894) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8265f5f8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 syscall+0x355 mi_syscall sys/sys/syscall_mi.h:65 [inline] #1 syscall+0x355 sys/arch/amd64/amd64/trap.c:555 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9519 6422K 7040K 78643K 11648 0 0 pcb 13 8K 8K 78643K 71 0 0 rtable 110 4K 4K 78643K 271 0 0 ifaddr 58 13K 13K 78643K 83 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1497 0 0 iov 0 0K 14K 78643K 44 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1213 76K 77K 78643K 1566 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 12 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 40 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 25K 78643K 417 0 0 sigio 0 0K 0K 78643K 2 0 0 proc 53 50K 83K 78643K 473 0 0 subproc 32 2K 2K 78643K 34 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 25 0 0 in_multi 33 2K 2K 78643K 46 0 0 ether_multi 1 0K 0K 78643K 1 0 0 mrt 0 0K 0K 78643K 4 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 42 185K 185K 78643K 42 0 0 exec 0 0K 1K 78643K 260 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 105 21K 25K 78643K 2246 0 0 UVM aobj 28 2K 2K 78643K 28 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 0K 78643K 42 0 0 NDP 12 0K 0K 78643K 22 0 0 temp 155 3547K 3613K 78643K 28577 0 0 kqueue 0 0K 0K 78643K 4 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 7 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 35 0 33 1 0 1 1 0 8 0 rtentry 112 48 0 3 2 0 2 2 0 8 0 unpcb 120 115 0 105 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 5092 0 5092 1 1 0 1 0 8 0 tcpcb 544 74 0 70 1 0 1 1 0 8 0 inpcb 280 231 0 223 1 0 1 1 0 8 0 rttmr 72 2 0 2 1 1 0 1 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 ppxss 1128 4 0 4 2 2 0 1 0 8 0 pffrag 232 2 0 2 1 0 1 1 0 482 1 pffrnode 88 2 0 2 1 0 1 1 0 8 1 pffrent 40 6 0 6 1 0 1 1 0 8 1 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 28 0 7 1 0 1 1 0 8 0 pfstkey 112 28 0 7 1 0 1 1 0 8 0 pfstate 328 28 0 7 2 0 2 2 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 217 0 28 13 1 12 13 0 8 0 art_table 32 218 0 28 2 0 2 2 0 8 0 art_node 16 47 0 6 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 1 1 0 1 1 0 8 0 semapl 112 38 0 28 1 0 1 1 0 8 0 shmpl 112 26 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2076 0 655 47 0 47 47 0 8 0 ffsino 272 2076 0 655 96 0 96 96 0 8 0 nchpl 144 2852 0 1204 62 0 62 62 0 8 0 uvmvnodes 72 2355 0 0 43 0 43 43 0 8 0 vnodes 200 2355 0 0 124 0 124 124 0 8 0 namei 1024 8264 0 8264 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 8618 0 8617 10 9 1 7 0 8 0 plimitpl 152 49 0 41 1 0 1 1 0 8 0 sigapl 432 618 0 602 3 1 2 3 0 8 0 futexpl 56 5216 0 5213 1 0 1 1 0 8 0 knotepl 112 128 0 109 1 0 1 1 0 8 0 kqueuepl 104 98 0 96 1 0 1 1 0 8 0 pipepl 112 334 0 315 1 0 1 1 0 8 0 fdescpl 488 619 0 602 3 0 3 3 0 8 0 filepl 152 3452 0 3347 6 1 5 5 0 8 0 lockfpl 104 196 0 196 2 1 1 1 0 8 1 lockfspl 48 60 0 60 2 1 1 1 0 8 1 sessionpl 112 19 0 8 1 0 1 1 0 8 0 pgrppl 48 19 0 8 1 0 1 1 0 8 0 ucredpl 96 513 0 503 1 0 1 1 0 8 0 zombiepl 144 602 0 602 2 1 1 1 0 8 1 processpl 896 635 0 602 4 0 4 4 0 8 0 procpl 632 1466 0 1418 6 2 4 5 0 8 0 srpgc 64 2 0 2 1 1 0 1 0 8 0 sosppl 128 10 0 10 1 1 0 1 0 8 0 sockpl 384 383 0 364 4 1 3 3 0 8 1 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 4 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 6 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 150 0 0 18 0 18 18 0 8 0 mtagpl 80 10 0 0 1 0 1 1 0 8 0 mbufpl 256 187 0 0 11 0 11 11 0 8 0 bufpl 256 6779 0 1170 351 0 351 351 0 8 0 anonpl 16 73876 0 61014 69 11 58 68 0 124 5 amapchunkpl 152 3148 0 3035 11 6 5 8 0 158 0 amappl16 192 3177 0 2467 50 13 37 45 0 8 1 amappl14 176 237 0 230 1 0 1 1 0 8 0 amappl13 168 206 0 204 2 1 1 1 0 8 0 amappl12 160 7 0 5 2 1 1 1 0 8 0 amappl11 152 60 0 45 1 0 1 1 0 8 0 amappl10 144 76 0 70 1 0 1 1 0 8 0 amappl9 136 609 0 605 1 0 1 1 0 8 0 amappl8 128 156 0 135 1 0 1 1 0 8 0 amappl7 120 36 0 31 1 0 1 1 0 8 0 amappl6 112 58 0 52 1 0 1 1 0 8 0 amappl5 104 141 0 126 1 0 1 1 0 8 0 amappl4 96 1084 0 1051 2 1 1 2 0 8 0 amappl3 88 371 0 359 1 0 1 1 0 8 0 amappl2 80 4044 0 3963 3 0 3 3 0 8 0 amappl1 72 23216 0 22745 26 16 10 20 0 8 0 amappl 80 1712 0 1670 1 0 1 1 0 84 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 27 0 0 1 0 1 1 0 8 0 uaddrrnd 24 619 0 602 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 619 0 602 1 0 1 1 0 8 0 vmmpekpl 168 8351 0 8319 3 1 2 2 0 8 0 vmmpepl 168 83056 0 81087 122 36 86 100 0 357 0 vmsppl 368 618 0 602 2 0 2 2 0 8 0 pdppl 4096 1245 0 1204 7 1 6 6 0 8 0 pvpl 32 227483 0 210812 177 21 156 166 0 265 21 pmappl 232 618 0 602 2 1 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 513 0 6 15 0 15 15 0 8 0