witness: thread 0xffff800020ab0510 exiting with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd8068bda0a8) #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_write+0xec sys/kern/spec_vnops.c:312 #6 VOP_WRITE+0xce sys/kern/vfs_vops.c:268 #7 vn_write+0x1be sys/kern/vfs_vnops.c:405 #8 dofilewritev+0x1ac sys/kern/sys_generic.c:364 #9 sys_write+0x83 sys/kern/sys_generic.c:284 #10 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #10 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #11 Xsyscall+0x128 panic: thread 0xffff800020ab0510 cannot exit while holding sleeplocks Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 392363 93418 73 0x100010 0 0 syslogd *277033 5471 0 0x14000 0x200 1 reaper 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_thread_exit(ffff800020ab0510) at witness_thread_exit+0x213 sys/kern/subr_witness.c:1364 reaper(ffff800020a5fb30) at reaper+0x14c sys/kern/kern_exit.c:423 end trace frame: 0x0, count: 11 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 thread 0xffff800020ab0510 cannot exit while holding sleeplocks 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_thread_exit(ffff800020ab0510) at witness_thread_exit+0x213 sys/kern/subr_witness.c:1364 reaper(ffff800020a5fb30) at reaper+0x14c sys/kern/kern_exit.c:423 end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020a5d800 rbx 0xffff800020a5d8b0 rdx 0xffff800020a5fb30 rcx 0 rax 0 r8 0xffffffff812b6fc3 kprintf+0x173 r9 0x1 r10 0x25 r11 0x9cd505db83624fc5 r12 0x3000000008 r13 0xffff800020a5d810 r14 0x100 r15 0x1 rip 0xffffffff81615ca8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020a5d7f0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (reaper) pid=277033 stat=onproc flags process=14000 proc=200 pri=4, usrpri=52, nice=20 forw=0xffffffffffffffff, list=0xffff800020a118b0,0xffff800020a5f650 process=0xffff800020a4a008 user=0xffff800020a58000, vmspace=0xffffffff82631b58 estcpu=2, cpticks=4, pctcpu=0.54 user=0, sys=6, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 12292 177003 1932 32767 3 0x90 nanosleep syz-executor.1 1932 19968 35804 0 3 0x82 wait syz-executor.1 46893 415100 0 0 3 0x14200 bored sosplice 35804 286893 12844 0 3 0x82 thrsleep syz-fuzzer 35804 251339 12844 0 3 0x4000082 thrsleep syz-fuzzer 35804 138498 12844 0 3 0x4000082 thrsleep syz-fuzzer 35804 209057 12844 0 3 0x4000082 thrsleep syz-fuzzer 35804 180289 12844 0 3 0x4000082 thrsleep syz-fuzzer 35804 97870 12844 0 3 0x4000082 thrsleep syz-fuzzer 35804 174125 12844 0 3 0x4000082 thrsleep syz-fuzzer 35804 430974 12844 0 3 0x4000082 thrsleep syz-fuzzer 35804 168588 12844 0 3 0x4000082 kqread syz-fuzzer 35804 350041 12844 0 3 0x4000082 thrsleep syz-fuzzer 12844 136392 55939 0 3 0x10008a pause ksh 55939 430534 98150 0 3 0x92 select sshd 82726 314033 1 0 3 0x100083 ttyin getty 98150 108601 1 0 3 0x80 select sshd 93418 392363 49080 73 7 0x100010 syslogd 49080 368283 1 0 3 0x100082 netio syslogd 37994 231722 1 77 3 0x100090 poll dhclient 60331 466101 1 0 3 0x80 poll dhclient 8904 515577 0 0 3 0x14200 pgzero zerothread 97577 293888 0 0 3 0x14200 aiodoned aiodoned 34828 99272 0 0 3 0x14200 syncer update 35250 228011 0 0 3 0x14200 cleaner cleaner * 5471 277033 0 0 7 0x14200 reaper 31159 284720 0 0 3 0x14200 pgdaemon pagedaemon 16939 160919 0 0 3 0x14200 bored crynlk 65886 521282 0 0 3 0x14200 bored crypto 54243 55226 0 0 3 0x40014200 acpi0 acpi0 37425 286719 0 0 3 0x40014200 idle1 12130 440666 0 0 3 0x14200 bored softnet 17052 164771 0 0 3 0x14200 bored systqmp 88834 261748 0 0 3 0x14200 bored systq 21246 75608 0 0 3 0x40014200 bored softclock 20024 516383 0 0 3 0x40014200 idle0 27886 129496 0 0 3 0x14200 bored smr 1 17632 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 93418 (syslogd) thread 0xffff800020ac0288 (392363) exclusive rrwlock inode r = 0 (0xfffffd806eb51808) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9457 6319K 6321K 78643K 10774 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 83 2K 3K 78643K 2219 0 0 ifaddr 29 9K 10K 78643K 311 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 108 0 0 iov 0 0K 32K 78643K 216 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 2376 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 28 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 338 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 33K 78643K 2606 0 0 sigio 0 0K 0K 78643K 24 0 0 proc 41 38K 70K 78643K 2425 0 0 subproc 17 1K 2K 78643K 799 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 354 0 0 in_multi 22 1K 2K 78643K 626 0 0 ether_multi 1 0K 0K 78643K 18 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 60 265K 265K 78643K 60 0 0 exec 0 0K 1K 78643K 929 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 88 12K 34K 78643K 9472 0 0 UVM aobj 102 6K 6K 78643K 119 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 149 0 0 NDP 6 0K 0K 78643K 144 0 0 temp 97 3545K 3614K 78643K 13761 0 0 kqueue 0 0K 0K 78643K 36 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 96 0 92 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 234 0 232 1 0 1 1 0 8 0 rtentry 112 540 0 507 2 0 2 2 0 8 0 unpcb 120 1052 0 1044 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 3229 0 3229 2 2 0 1 0 8 0 tcpcb 544 604 0 600 1 0 1 1 0 8 0 ipq 40 5 0 5 4 4 0 1 0 8 0 ipqe 40 14 0 14 4 4 0 1 0 8 0 inpcb 280 1489 0 1482 1 0 1 1 0 8 0 nd6 48 141 0 138 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2213 0 2066 14 1 13 13 0 8 0 art_table 32 2214 0 2066 2 0 2 2 0 8 0 art_node 16 539 0 509 1 0 1 1 0 8 0 sysvmsgpl 40 17 0 10 1 0 1 1 0 8 0 semapl 112 336 0 326 1 0 1 1 0 8 0 shmpl 112 117 0 17 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 4126 0 2697 47 0 47 47 0 8 0 ffsino 272 4126 0 2697 96 0 96 96 0 8 0 nchpl 144 7365 0 5734 61 0 61 61 0 8 0 uvmvnodes 72 4934 0 0 90 0 90 90 0 8 0 vnodes 200 4934 0 0 260 0 260 260 0 8 0 namei 1024 28165 0 28165 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 22059 0 22059 16 15 1 7 0 8 1 plimitpl 152 465 0 457 1 0 1 1 0 8 0 sigapl 432 2642 0 2629 3 1 2 3 0 8 0 futexpl 56 23298 0 23298 1 0 1 1 0 8 1 knotepl 112 1536 0 1519 1 0 1 1 0 8 0 kqueuepl 104 624 0 622 1 0 1 1 0 8 0 pipepl 112 1750 0 1735 5 4 1 2 0 8 0 fdescpl 488 2643 0 2629 3 0 3 3 0 8 0 filepl 152 15956 0 15878 12 7 5 7 0 8 1 lockfpl 104 438 0 438 3 2 1 1 0 8 1 lockfspl 48 142 0 142 3 2 1 1 0 8 1 sessionpl 112 62 0 53 1 0 1 1 0 8 0 pgrppl 48 79 0 70 1 0 1 1 0 8 0 ucredpl 96 4276 0 4268 1 0 1 1 0 8 0 zombiepl 144 2630 0 2628 2 1 1 1 0 8 0 processpl 896 2659 0 2628 4 0 4 4 0 8 0 procpl 632 6865 0 6824 9 4 5 5 0 8 1 srpgc 64 92 0 92 7 6 1 1 0 8 1 sosppl 128 44 0 44 11 11 0 1 0 8 0 sockpl 384 2831 0 2814 6 3 3 4 0 8 1 mcl64k 65536 10 0 0 2 0 2 2 0 8 0 mcl16k 16384 8 0 0 1 0 1 1 0 8 0 mcl12k 12288 21 0 0 2 0 2 2 0 8 0 mcl9k 9216 7 0 0 1 0 1 1 0 8 0 mcl8k 8192 23 0 0 3 1 2 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 124 0 0 15 0 15 15 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 280 0 0 12 0 12 12 0 8 0 bufpl 256 11737 0 4723 439 0 439 439 0 8 0 anonpl 16 270995 0 264813 93 51 42 62 0 124 6 amapchunkpl 152 20755 0 20666 49 44 5 14 0 158 1 amappl16 192 10195 0 9803 77 44 33 34 0 8 12 amappl15 184 505 0 505 5 5 0 1 0 8 0 amappl14 176 875 0 870 1 0 1 1 0 8 0 amappl13 168 430 0 430 7 7 0 1 0 8 0 amappl12 160 220 0 215 2 1 1 1 0 8 0 amappl11 152 420 0 409 1 0 1 1 0 8 0 amappl10 144 534 0 530 1 0 1 1 0 8 0 amappl9 136 1319 0 1317 1 0 1 1 0 8 0 amappl8 128 749 0 728 1 0 1 1 0 8 0 amappl7 120 579 0 571 1 0 1 1 0 8 0 amappl6 112 324 0 316 1 0 1 1 0 8 0 amappl5 104 645 0 634 1 0 1 1 0 8 0 amappl4 96 2739 0 2710 2 1 1 2 0 8 0 amappl3 88 1012 0 1002 1 0 1 1 0 8 0 amappl2 80 17127 0 17060 3 1 2 3 0 8 0 amappl1 72 79468 0 79036 23 13 10 19 0 8 0 amappl 80 7828 0 7794 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 64 118 0 17 2 0 2 2 0 8 0 uaddrrnd 24 2643 0 2629 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2643 0 2629 1 0 1 1 0 8 0 vmmpekpl 168 25033 0 25003 2 0 2 2 0 8 0 vmmpepl 168 342394 0 340923 139 53 86 87 0 357 14 vmsppl 368 2642 0 2629 2 0 2 2 0 8 0 pdppl 4096 5293 0 5258 6 0 6 6 0 8 1 pvpl 32 801976 0 792683 228 111 117 158 0 265 26 pmappl 232 2642 0 2629 6 4 2 2 0 8 1 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 602 0 5 18 0 18 18 0 8 0