witness: thread 0xffff800020a898d0 exiting with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd806ec9ee68) #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 0xffff800020a898d0 cannot exit while holding sleeplocks Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 73524 26598 73 0x100010 0 0 syslogd *216577 46062 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(ffff800020a898d0) at witness_thread_exit+0x213 sys/kern/subr_witness.c:1364 reaper(ffff800020a5f640) 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 0xffff800020a898d0 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(ffff800020a898d0) at witness_thread_exit+0x213 sys/kern/subr_witness.c:1364 reaper(ffff800020a5f640) at reaper+0x14c sys/kern/kern_exit.c:423 end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020a5dd60 rbx 0xffff800020a5de10 rdx 0xffff800020a5f640 rcx 0 rax 0 r8 0xffffffff81de8423 kprintf+0x173 r9 0x1 r10 0x25 r11 0x1f657795d801f682 r12 0x3000000008 r13 0xffff800020a5dd70 r14 0x100 r15 0x1 rip 0xffffffff81e723a8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020a5dd50 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (reaper) pid=216577 stat=onproc flags process=14000 proc=200 pri=4, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020a11b28,0xffff800020a5f3d8 process=0xffff800020a4a388 user=0xffff800020a58000, vmspace=0xffffffff8261bff0 estcpu=1, cpticks=8, pctcpu=0.63 user=0, sys=5, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 27821 205116 83628 32767 3 0x90 nanosleep syz-executor.1 83628 274150 75588 0 3 0x82 wait syz-executor.1 23239 313363 9509 32767 3 0x90 piperd syz-executor.0 9509 389770 75588 0 3 0x82 wait syz-executor.0 37611 339310 0 0 3 0x14200 bored sosplice 75588 326861 75743 0 3 0x82 thrsleep syz-fuzzer 75588 125487 75743 0 3 0x4000082 thrsleep syz-fuzzer 75588 315834 75743 0 3 0x4000082 thrsleep syz-fuzzer 75588 90534 75743 0 3 0x4000082 thrsleep syz-fuzzer 75588 361985 75743 0 3 0x4000082 thrsleep syz-fuzzer 75588 479905 75743 0 3 0x4000082 thrsleep syz-fuzzer 75588 503158 75743 0 3 0x4000082 kqread syz-fuzzer 75588 195619 75743 0 3 0x4000082 thrsleep syz-fuzzer 75588 172713 75743 0 3 0x4000082 thrsleep syz-fuzzer 75588 245479 75743 0 3 0x4000082 thrsleep syz-fuzzer 75743 261993 10494 0 3 0x10008a pause ksh 10494 58178 56113 0 3 0x92 select sshd 30080 402394 1 0 3 0x100083 ttyin getty 56113 398463 1 0 3 0x80 select sshd 26598 73524 26951 73 7 0x100010 syslogd 26951 269214 1 0 3 0x100082 netio syslogd 78293 313448 1 77 3 0x100090 poll dhclient 79950 467990 1 0 3 0x80 poll dhclient 2176 79847 0 0 3 0x14200 pgzero zerothread 10068 199446 0 0 3 0x14200 aiodoned aiodoned 69146 43338 0 0 3 0x14200 syncer update 46953 110903 0 0 3 0x14200 cleaner cleaner *46062 216577 0 0 7 0x14200 reaper 85023 486365 0 0 3 0x14200 pgdaemon pagedaemon 63756 410813 0 0 3 0x14200 bored crynlk 2826 394891 0 0 3 0x14200 bored crypto 96452 455346 0 0 3 0x40014200 acpi0 acpi0 66205 263170 0 0 3 0x40014200 idle1 9142 293967 0 0 3 0x14200 bored softnet 98872 12291 0 0 3 0x14200 bored systqmp 30097 434597 0 0 3 0x14200 bored systq 40392 291703 0 0 3 0x40014200 bored softclock 22090 402903 0 0 3 0x40014200 idle0 19847 491390 0 0 3 0x14200 bored smr 1 338616 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 26598 (syslogd) thread 0xffff800020ac09f0 (73524) exclusive rrwlock inode r = 0 (0xfffffd806eb5f808) #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 9464 6322K 6322K 78643K 11531 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 107 3K 3K 78643K 8971 0 0 ifaddr 37 14K 15K 78643K 1237 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 438 0 0 iov 0 0K 32K 78643K 761 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 6005 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 126 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 1K 1K 78643K 970 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 33K 78643K 10108 0 0 sigio 0 0K 0K 78643K 90 0 0 proc 41 38K 70K 78643K 9274 0 0 subproc 34 2K 2K 78643K 3366 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 1192 0 0 in_multi 33 2K 2K 78643K 2480 0 0 ether_multi 1 0K 0K 78643K 56 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 72 318K 318K 78643K 72 0 0 exec 0 0K 1K 78643K 3334 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 106 21K 31K 78643K 34466 0 0 UVM aobj 130 4K 4K 78643K 138 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 547 0 0 NDP 5 0K 0K 78643K 597 0 0 temp 121 3542K 3618K 78643K 46856 0 0 kqueue 0 0K 0K 78643K 170 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 64 403 0 396 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 815 0 813 1 0 1 1 0 8 0 rtentry 112 2206 0 2161 2 0 2 2 0 8 0 unpcb 120 3672 0 3664 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 3477 0 3477 1 1 0 1 0 8 0 tcpcb 544 2153 0 2149 1 0 1 1 0 8 0 ipq 40 12 0 12 6 6 0 1 0 8 0 ipqe 40 36 0 36 6 6 0 1 0 8 0 inpcb 280 5335 0 5325 12 11 1 2 0 8 0 nd6 48 594 0 588 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 9043 0 8851 23 11 12 13 0 8 0 art_table 32 9044 0 8851 2 0 2 2 0 8 0 art_node 16 2205 0 2164 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 6 2 1 1 1 0 8 0 semapl 112 968 0 958 1 0 1 1 0 8 0 shmpl 112 136 0 8 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 11520 0 10079 47 0 47 47 0 8 0 ffsino 272 11520 0 10079 98 1 97 97 0 8 0 nchpl 144 23237 0 21607 61 0 61 61 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 101061 0 101061 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 70574 0 70574 32 31 1 7 0 8 1 plimitpl 152 1722 0 1713 1 0 1 1 0 8 0 sigapl 432 9691 0 9677 10 8 2 3 0 8 0 futexpl 56 88484 0 88484 1 0 1 1 0 8 1 knotepl 112 6042 0 6023 1 0 1 1 0 8 0 kqueuepl 104 2145 0 2143 1 0 1 1 0 8 0 pipepl 112 6082 0 6063 13 12 1 2 0 8 0 fdescpl 488 9692 0 9677 3 0 3 3 0 8 1 filepl 152 58985 0 58889 21 16 5 7 0 8 1 lockfpl 104 1782 0 1782 19 18 1 1 0 8 1 lockfspl 48 571 0 571 19 18 1 1 0 8 1 sessionpl 112 213 0 203 1 0 1 1 0 8 0 pgrppl 48 323 0 313 1 0 1 1 0 8 0 ucredpl 96 16522 0 16513 1 0 1 1 0 8 0 zombiepl 144 9677 0 9676 3 2 1 1 0 8 0 processpl 896 9708 0 9676 4 0 4 4 0 8 0 procpl 632 25515 0 25472 31 26 5 5 0 8 1 srpgc 64 392 0 392 27 26 1 1 0 8 1 sosppl 128 179 0 179 35 34 1 1 0 8 1 sockpl 384 9983 0 9966 13 10 3 4 0 8 1 mcl64k 65536 25 0 0 4 1 3 3 0 8 0 mcl16k 16384 20 0 0 3 1 2 3 0 8 0 mcl12k 12288 33 0 0 2 0 2 2 0 8 0 mcl9k 9216 29 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 1 2 3 0 8 0 mcl4k 4096 25 0 0 4 1 3 3 0 8 0 mcl2k2 2112 13 0 0 1 0 1 1 0 8 0 mcl2k 2048 154 0 0 14 4 10 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 667 0 0 15 3 12 13 0 8 0 bufpl 256 20906 0 13892 439 0 439 439 0 8 0 anonpl 16 1033012 0 1026604 250 212 38 49 0 124 0 amapchunkpl 152 81704 0 81602 149 144 5 18 0 158 0 amappl16 192 41947 0 41564 272 251 21 33 0 8 0 amappl15 184 1284 0 1284 23 23 0 1 0 8 0 amappl14 176 2348 0 2342 1 0 1 1 0 8 0 amappl13 168 1530 0 1529 1 0 1 1 0 8 0 amappl12 160 1176 0 1172 1 0 1 1 0 8 0 amappl11 152 1890 0 1879 1 0 1 1 0 8 0 amappl10 144 1568 0 1565 1 0 1 1 0 8 0 amappl9 136 3981 0 3978 1 0 1 1 0 8 0 amappl8 128 2927 0 2897 3 1 2 2 0 8 0 amappl7 120 1918 0 1910 1 0 1 1 0 8 0 amappl6 112 1433 0 1426 1 0 1 1 0 8 0 amappl5 104 2510 0 2495 1 0 1 1 0 8 0 amappl4 96 9785 0 9756 2 1 1 2 0 8 0 amappl3 88 2607 0 2594 1 0 1 1 0 8 0 amappl2 80 61869 0 61801 4 2 2 3 0 8 0 amappl1 72 271757 0 271302 23 13 10 19 0 8 0 amappl 80 28843 0 28800 2 1 1 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 64 137 0 8 3 0 3 3 0 8 0 uaddrrnd 24 9692 0 9676 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 9692 0 9676 1 0 1 1 0 8 0 vmmpekpl 168 81681 0 81649 2 0 2 2 0 8 0 vmmpepl 168 1247320 0 1245712 288 210 78 90 0 357 2 vmsppl 368 9691 0 9676 2 0 2 2 0 8 0 pdppl 4096 19391 0 19352 6 0 6 6 0 8 0 pvpl 32 2879432 0 2869791 547 447 100 132 0 265 6 pmappl 232 9691 0 9676 25 24 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 619 0 25 19 1 18 18 0 8 0