witness: thread 0xffff800020b28c70 exiting with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd806e4eb0a0) #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 0xffff800020b28c70 cannot exit while holding sleeplocks Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 197334 75948 73 0x100010 0 1 syslogd *341102 24755 0 0x14000 0x200 0 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(ffff800020b28c70) at witness_thread_exit+0x213 sys/kern/subr_witness.c:1364 reaper(ffff800020affb30) 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic thread 0xffff800020b28c70 cannot exit while holding sleeplocks 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_thread_exit(ffff800020b28c70) at witness_thread_exit+0x213 sys/kern/subr_witness.c:1364 reaper(ffff800020affb30) at reaper+0x14c sys/kern/kern_exit.c:423 end trace frame: 0x0, count: -4 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020afd240 rbx 0xffff800020afd2f0 rdx 0xffff800020affb30 rcx 0 rax 0 r8 0xffffffff81051333 kprintf+0x173 r9 0x1 r10 0x25 r11 0xd130c3706ee86ada r12 0x3000000008 r13 0xffff800020afd250 r14 0x100 r15 0x1 rip 0xffffffff81173b88 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020afd230 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (reaper) pid=341102 stat=onproc flags process=14000 proc=200 pri=4, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab18b0,0xffff800020aff3d8 process=0xffff800020aea708 user=0xffff800020af8000, vmspace=0xffffffff82395528 estcpu=1, cpticks=5, pctcpu=0.41 user=0, sys=5, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 12563 42784 93357 0 2 0x482 syz-executor.1 95275 410575 93357 0 3 0x82 piperd syz-executor.0 30347 206365 1 0 3 0x100083 ttyin getty 96972 186774 0 0 3 0x14200 bored sosplice 93357 90167 97649 0 3 0x82 thrsleep syz-fuzzer 93357 450799 97649 0 3 0x4000082 thrsleep syz-fuzzer 93357 22388 97649 0 3 0x4000082 thrsleep syz-fuzzer 93357 45658 97649 0 3 0x4000082 thrsleep syz-fuzzer 93357 297898 97649 0 3 0x4000082 thrsleep syz-fuzzer 93357 384673 97649 0 3 0x4000082 thrsleep syz-fuzzer 93357 271592 97649 0 3 0x4000082 kqread syz-fuzzer 93357 484669 97649 0 3 0x4000082 thrsleep syz-fuzzer 93357 427410 97649 0 3 0x4000082 thrsleep syz-fuzzer 93357 464473 97649 0 3 0x4000082 thrsleep syz-fuzzer 97649 203886 75545 0 3 0x10008a pause ksh 75545 336114 69148 0 3 0x92 select sshd 69148 39749 1 0 3 0x80 select sshd 63378 30546 47490 74 3 0x100092 bpf pflogd 47490 90675 1 0 3 0x80 netio pflogd 75948 197334 97862 73 7 0x100010 syslogd 97862 193444 1 0 3 0x100082 netio syslogd 16316 415751 1 77 3 0x100090 poll dhclient 49133 247027 1 0 3 0x80 poll dhclient 36564 117566 0 0 3 0x14200 pgzero zerothread 54842 121541 0 0 3 0x14200 aiodoned aiodoned 96964 201994 0 0 3 0x14200 syncer update 47387 58019 0 0 3 0x14200 cleaner cleaner *24755 341102 0 0 7 0x14200 reaper 61101 230904 0 0 3 0x14200 pgdaemon pagedaemon 34900 171749 0 0 3 0x14200 bored crynlk 39727 34397 0 0 3 0x14200 bored crypto 68216 231362 0 0 3 0x40014200 acpi0 acpi0 38199 63060 0 0 3 0x40014200 idle1 61741 319531 0 0 3 0x14200 bored softnet 25474 152693 0 0 3 0x14200 bored systqmp 26237 338974 0 0 3 0x14200 bored systq 54813 92637 0 0 3 0x40014200 bored softclock 13942 232357 0 0 3 0x40014200 idle0 24868 305991 0 0 3 0x14200 bored smr 1 190437 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 75948 (syslogd) thread 0xffff800020b60010 (197334) exclusive rrwlock inode r = 0 (0xfffffd806eb67e68) #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 9659 6489K 14914K 78643K 60432 0 0 pcb 13 8K 8K 78643K 1524 0 0 rtable 121 13K 13K 78643K 4049 0 0 ifaddr 103 29K 37K 78643K 1966 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 2422 0 0 iov 0 0K 28K 78643K 2696 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1197 75K 77K 78643K 19384 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 9K 78643K 295 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 2179 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 4 9K 25K 78643K 20195 0 0 sigio 0 0K 0K 78643K 293 0 0 proc 54 51K 83K 78643K 2842 0 0 subproc 32 2K 2K 78643K 203 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 1874 0 0 in_multi 33 2K 2K 78643K 786 0 0 ether_multi 1 0K 0K 78643K 90 0 0 mrt 0 0K 0K 78643K 86 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 144 636K 636K 78643K 144 0 0 exec 0 0K 1K 78643K 2010 0 0 pfkey data 0 0K 4K 78643K 13 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 113 22K 32K 78643K 66598 0 0 UVM aobj 130 4K 4K 78643K 153 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 1K 78643K 1059 0 0 NDP 26 0K 1K 78643K 541 0 0 temp 270 2754K 3396K 78643K 65988 0 0 kqueue 0 0K 0K 78643K 183 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 29 0 22 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 769 0 767 1 0 1 1 0 8 0 rtentry 112 186 0 141 3 1 2 2 0 8 0 unpcb 120 6632 0 6622 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 8539 0 8539 2 2 0 2 0 8 0 tcpcb 544 3104 0 3100 1 0 1 1 0 8 0 inpcb 280 9156 0 9147 10 9 1 2 0 8 0 rttmr 72 19 0 19 12 12 0 1 0 8 0 ip6q 72 3 0 3 1 1 0 1 0 8 0 ip6af 48 6 0 6 1 1 0 1 0 8 0 nd6 48 33 0 27 1 0 1 1 0 8 0 pkpcb 40 121 0 121 36 36 0 1 0 8 0 swfcl 56 8 0 0 1 0 1 1 0 8 0 ppxss 1128 388 0 388 45 44 1 1 0 8 1 pffrag 232 30 0 30 17 17 0 1 0 482 0 pffrnode 88 30 0 30 17 17 0 1 0 8 0 pffrent 40 75 0 75 20 20 0 1 0 8 0 pfosfp 40 846 0 846 5 5 0 5 0 8 0 pfosfpen 112 1428 0 1428 21 21 0 21 0 8 0 pfstitem 24 437 0 425 1 0 1 1 0 8 0 pfstkey 112 437 0 425 1 0 1 1 0 8 0 pfstate 328 437 0 425 8 6 2 3 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 256 655 0 456 22 9 13 14 0 8 0 art_table 32 656 0 456 2 0 2 2 0 8 0 art_node 16 165 0 124 1 0 1 1 0 8 0 sysvmsgpl 40 15 0 8 1 0 1 1 0 8 0 semapl 112 2177 0 2167 1 0 1 1 0 8 0 shmpl 112 151 0 23 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 34580 0 33178 47 0 47 47 0 8 0 ffsino 272 34580 0 33178 96 0 96 96 0 8 0 nchpl 144 63192 0 61564 62 0 62 62 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 200 5926 0 0 312 0 312 312 0 8 0 namei 1024 201289 0 201289 10 9 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 46 0 46 25 24 1 1 0 8 1 scxspl 192 187679 0 187679 98 97 1 6 0 8 1 plimitpl 152 1813 0 1805 1 0 1 1 0 8 0 sigapl 432 20374 0 20360 3 1 2 3 0 8 0 futexpl 56 247978 0 247978 9 8 1 1 0 8 1 knotepl 112 3669 0 3650 1 0 1 1 0 8 0 kqueuepl 104 4607 0 4605 1 0 1 1 0 8 0 pipepl 112 10912 0 10893 16 14 2 2 0 8 1 fdescpl 488 20375 0 20360 3 0 3 3 0 8 0 filepl 152 120110 0 120011 26 21 5 7 0 8 1 lockfpl 104 6377 0 6377 13 12 1 1 0 8 1 lockfspl 48 2224 0 2224 13 12 1 1 0 8 1 sessionpl 112 33 0 22 1 0 1 1 0 8 0 pgrppl 48 211 0 200 1 0 1 1 0 8 0 ucredpl 96 24094 0 24085 1 0 1 1 0 8 0 zombiepl 144 20360 0 20359 6 5 1 1 0 8 0 processpl 896 20391 0 20359 4 0 4 4 0 8 0 procpl 632 64791 0 64749 42 37 5 5 0 8 1 srpgc 64 33 0 33 20 20 0 1 0 8 0 sosppl 128 232 0 232 48 48 0 1 0 8 0 sockpl 384 16849 0 16830 28 25 3 4 0 8 1 mcl64k 65536 1318 0 0 150 105 45 65 0 8 1 mcl16k 16384 43 0 0 6 4 2 3 0 8 0 mcl12k 12288 33 0 0 2 0 2 2 0 8 0 mcl9k 9216 57 0 0 3 1 2 2 0 8 0 mcl8k 8192 23 0 0 3 1 2 3 0 8 0 mcl4k 4096 64 0 0 3 0 3 3 0 8 0 mcl2k2 2112 11 0 0 1 0 1 1 0 8 0 mcl2k 2048 300 0 0 26 18 8 26 0 8 0 mtagpl 80 259 0 0 3 0 3 3 0 8 0 mbufpl 256 1616 0 0 43 0 43 43 0 8 0 bufpl 256 56061 0 49032 440 0 440 440 0 8 0 anonpl 16 1780125 0 1768278 373 315 58 67 0 125 0 amapchunkpl 152 120113 0 119966 143 135 8 20 0 158 1 amappl16 192 99921 0 99268 497 463 34 47 0 8 0 amappl15 184 7979 0 7978 2 1 1 1 0 8 0 amappl14 176 6860 0 6855 1 0 1 1 0 8 0 amappl13 168 1654 0 1653 3 2 1 1 0 8 0 amappl12 160 14 0 13 1 0 1 1 0 8 0 amappl11 152 4076 0 4060 1 0 1 1 0 8 0 amappl10 144 322 0 317 1 0 1 1 0 8 0 amappl9 136 5363 0 5360 1 0 1 1 0 8 0 amappl8 128 4881 0 4861 1 0 1 1 0 8 0 amappl7 120 309 0 300 1 0 1 1 0 8 0 amappl6 112 4050 0 4039 1 0 1 1 0 8 0 amappl5 104 419 0 405 1 0 1 1 0 8 0 amappl4 96 21583 0 21552 2 1 1 2 0 8 0 amappl3 88 2459 0 2448 1 0 1 1 0 8 0 amappl2 80 171135 0 171065 3 1 2 3 0 8 0 amappl1 72 434260 0 433802 26 16 10 20 0 8 0 amappl 80 65325 0 65276 2 0 2 2 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 64 152 0 23 3 0 3 3 0 8 0 uaddrrnd 24 20375 0 20359 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 20375 0 20359 1 0 1 1 0 8 0 vmmpekpl 168 146238 0 146207 2 0 2 2 0 8 0 vmmpepl 168 2439823 0 2438015 511 426 85 101 0 357 1 vmsppl 368 20374 0 20359 2 0 2 2 0 8 0 pdppl 4096 40758 0 40718 6 0 6 6 0 8 0 pvpl 32 4692045 0 4676928 766 632 134 167 0 265 0 pmappl 232 20374 0 20359 2 1 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 816 0 149 20 0 20 20 0 8 0