login: witness: userret: returning with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd8068280d68) #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 sys_fchmod+0x160 sys/kern/vfs_syscalls.c:2311 #6 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #6 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #7 Xsyscall+0x128 panic: witness_warn Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 24084 59726 32767 0x10 0 1 syz-executor.1 *122081 59726 32767 0x10 0x4000000 0 syz-executor.1 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,ffffffff82205d3b) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff82205d3b) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020a88290) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800024fb30b0) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800024fb30b0) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,9,fffffffffffffed9,0,2,4acddba6280) at Xsyscall+0x128 end of kernel end trace frame: 0x4af3779bb90, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic witness_warn ddb{0}> 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,ffffffff82205d3b) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff82205d3b) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020a88290) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800024fb30b0) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800024fb30b0) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,9,fffffffffffffed9,0,2,4acddba6280) at Xsyscall+0x128 end of kernel end trace frame: 0x4af3779bb90, count: -6 ddb{0}> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024fb2df0 rbx 0xffff800024fb2ea0 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff80002337c000 rax 0xffff800000a6e400 r8 0xffffffff812b6fc3 kprintf+0x173 r9 0x1 r10 0x25 r11 0x9b513e96af9997f7 r12 0x3000000008 r13 0xffff800024fb2e00 r14 0x100 r15 0x1 rip 0xffffffff81615ca8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024fb2de0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=122081 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020a88ee8,0xffffffff82620128 process=0xffff800020a8b890 user=0xffff800024fae000, vmspace=0xfffffd806e8b62e8 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=4, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 59726 24084 14757 32767 7 0x10 syz-executor.1 59726 323729 14757 32767 3 0x4000090 fsleep syz-executor.1 59726 87459 14757 32767 2 0x4000010 syz-executor.1 59726 69578 14757 32767 3 0x4000090 fsleep syz-executor.1 *59726 122081 14757 32767 7 0x4000010 syz-executor.1 65 520684 25650 32767 2 0x490 syz-executor.0 25650 68478 88530 0 3 0x82 wait syz-executor.0 14757 74089 49056 32767 3 0x90 nanosleep syz-executor.1 49056 160574 88530 0 3 0x82 wait syz-executor.1 36662 420981 0 0 3 0x14200 bored sosplice 88530 283459 52278 0 3 0x82 thrsleep syz-fuzzer 88530 31261 52278 0 2 0x4000482 syz-fuzzer 88530 386806 52278 0 3 0x4000082 thrsleep syz-fuzzer 88530 298345 52278 0 3 0x4000082 thrsleep syz-fuzzer 88530 493206 52278 0 3 0x4000082 kqread syz-fuzzer 88530 478055 52278 0 3 0x4000082 thrsleep syz-fuzzer 88530 184069 52278 0 3 0x4000082 thrsleep syz-fuzzer 88530 216425 52278 0 3 0x4000082 thrsleep syz-fuzzer 88530 132767 52278 0 3 0x4000082 thrsleep syz-fuzzer 88530 468016 52278 0 3 0x4000082 thrsleep syz-fuzzer 52278 350413 56788 0 3 0x10008a pause ksh 56788 56223 3257 0 3 0x92 select sshd 53413 500228 1 0 3 0x100083 ttyin getty 3257 497277 1 0 3 0x80 select sshd 71904 198171 58612 73 3 0x100010 ffs_fsync syslogd 58612 205888 1 0 3 0x100082 netio syslogd 18413 222790 1 77 3 0x100090 poll dhclient 87979 161152 1 0 3 0x80 poll dhclient 88149 388782 0 0 3 0x14200 pgzero zerothread 97854 217215 0 0 3 0x14200 aiodoned aiodoned 1150 491809 0 0 3 0x14200 syncer update 76444 178753 0 0 3 0x14200 cleaner cleaner 54817 444870 0 0 3 0x14200 reaper reaper 93226 450342 0 0 3 0x14200 pgdaemon pagedaemon 2994 472574 0 0 3 0x14200 bored crynlk 66453 315216 0 0 3 0x14200 bored crypto 66252 244488 0 0 3 0x40014200 acpi0 acpi0 97879 234596 0 0 3 0x40014200 idle1 16804 191411 0 0 3 0x14200 bored softnet 21618 38305 0 0 3 0x14200 bored systqmp 77653 449756 0 0 3 0x14200 bored systq 28521 3540 0 0 3 0x40014200 bored softclock 55914 5721 0 0 3 0x40014200 idle0 76633 386378 0 0 3 0x14200 bored smr 1 403782 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 59726 (syz-executor.1) thread 0xffff800020a88290 (122081) exclusive rrwlock inode r = 0 (0xfffffd8068280d68) #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 sys_fchmod+0x160 sys/kern/vfs_syscalls.c:2311 #6 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #6 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #7 Xsyscall+0x128 Process 71904 (syslogd) thread 0xffff800020ac0010 (198171) exclusive rrwlock inode r = 0 (0xfffffd806eb4f098) #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 sys_fsync+0x114 sys/kern/vfs_syscalls.c:2806 #6 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #6 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9460 6321K 6321K 78643K 10632 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 105 3K 3K 78643K 960 0 0 ifaddr 36 10K 10K 78643K 143 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 59 0 0 iov 0 0K 24K 78643K 51 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 1637 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 14 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 67 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 7 21K 33K 78643K 991 0 0 sigio 0 0K 0K 78643K 11 0 0 proc 41 38K 70K 78643K 1121 0 0 subproc 34 2K 2K 78643K 323 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 136 0 0 in_multi 33 2K 2K 78643K 250 0 0 ether_multi 1 0K 0K 78643K 7 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 48 212K 212K 78643K 48 0 0 exec 0 0K 1K 78643K 480 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 93 21K 22K 78643K 4058 0 0 UVM aobj 32 2K 2K 78643K 43 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 5 0K 0K 78643K 60 0 0 temp 121 3546K 3614K 78643K 7039 0 0 kqueue 0 0K 0K 78643K 15 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 40 0 34 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 101 0 99 1 0 1 1 0 8 0 rtentry 112 232 0 188 2 0 2 2 0 8 0 unpcb 120 378 0 370 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 1327 0 1327 1 1 0 1 0 8 0 tcpcb 544 237 0 233 1 0 1 1 0 8 0 inpcb 280 574 0 567 2 1 1 2 0 8 0 nd6 48 57 0 51 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 957 0 766 12 0 12 12 0 8 0 art_table 32 958 0 766 2 0 2 2 0 8 0 art_node 16 231 0 191 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 1 1 0 1 1 0 8 0 semapl 112 65 0 55 1 0 1 1 0 8 0 shmpl 112 41 0 11 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2420 0 990 47 0 47 47 0 8 0 ffsino 272 2420 0 990 96 0 96 96 0 8 0 nchpl 144 3784 0 2157 61 0 61 61 0 8 0 uvmvnodes 72 2752 0 0 51 0 51 51 0 8 0 vnodes 200 2752 0 0 145 0 145 145 0 8 0 namei 1024 12978 0 12978 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 10377 0 10376 12 9 3 7 0 8 2 plimitpl 152 172 0 163 1 0 1 1 0 8 0 sigapl 432 1111 0 1096 4 2 2 3 0 8 0 futexpl 56 8206 0 8204 1 0 1 1 0 8 0 knotepl 112 587 0 568 1 0 1 1 0 8 0 kqueuepl 104 170 0 168 1 0 1 1 0 8 0 pipepl 112 690 0 671 2 0 2 2 0 8 1 fdescpl 488 1112 0 1096 3 0 3 3 0 8 0 filepl 152 6289 0 6186 6 1 5 5 0 8 0 lockfpl 104 188 0 188 4 3 1 1 0 8 1 lockfspl 48 53 0 53 4 3 1 1 0 8 1 sessionpl 112 34 0 24 1 0 1 1 0 8 0 pgrppl 48 43 0 33 1 0 1 1 0 8 0 ucredpl 96 1447 0 1438 1 0 1 1 0 8 0 zombiepl 144 1096 0 1095 1 0 1 1 0 8 0 processpl 896 1128 0 1095 4 0 4 4 0 8 0 procpl 632 2685 0 2639 6 1 5 5 0 8 1 srpgc 64 34 0 34 3 3 0 1 0 8 0 sosppl 128 24 0 24 4 4 0 1 0 8 0 sockpl 384 1073 0 1056 3 0 3 3 0 8 1 mcl64k 65536 16 0 0 2 0 2 2 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 6 0 0 1 0 1 1 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 6 0 0 1 0 1 1 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 132 0 0 16 0 16 16 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 228 0 0 12 0 12 12 0 8 0 bufpl 256 6933 0 1156 362 0 362 362 0 8 0 anonpl 16 104032 0 96677 49 18 31 37 0 124 1 amapchunkpl 152 8453 0 8363 22 17 5 11 0 158 0 amappl16 192 3475 0 3094 29 8 21 22 0 8 1 amappl15 184 151 0 151 1 1 0 1 0 8 0 amappl14 176 301 0 295 1 0 1 1 0 8 0 amappl13 168 64 0 64 3 3 0 1 0 8 0 amappl12 160 268 0 264 1 0 1 1 0 8 0 amappl11 152 260 0 245 1 0 1 1 0 8 0 amappl10 144 179 0 173 1 0 1 1 0 8 0 amappl9 136 844 0 840 1 0 1 1 0 8 0 amappl8 128 350 0 331 1 0 1 1 0 8 0 amappl7 120 162 0 151 1 0 1 1 0 8 0 amappl6 112 221 0 211 1 0 1 1 0 8 0 amappl5 104 469 0 459 1 0 1 1 0 8 0 amappl4 96 1242 0 1213 1 0 1 1 0 8 0 amappl3 88 446 0 435 1 0 1 1 0 8 0 amappl2 80 6765 0 6699 3 1 2 3 0 8 0 amappl1 72 37785 0 37346 25 16 9 19 0 8 0 amappl 80 3169 0 3132 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 42 0 11 1 0 1 1 0 8 0 uaddrrnd 24 1112 0 1096 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1112 0 1096 1 0 1 1 0 8 0 vmmpekpl 168 12781 0 12750 2 0 2 2 0 8 0 vmmpepl 168 145193 0 143621 92 17 75 79 0 357 6 vmsppl 368 1111 0 1096 2 0 2 2 0 8 0 pdppl 4096 2231 0 2192 6 0 6 6 0 8 1 pvpl 32 341718 0 331160 126 33 93 103 0 265 7 pmappl 232 1111 0 1096 4 3 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 519 0 2 15 0 15 15 0 8 0