witness: thread 0xffff800020ab1160 exiting with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd807b2f6d58) #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 0xffff800020ab1160 cannot exit while holding sleeplocks Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 514819 97899 32767 0x10 0 1 syz-executor.1 *290777 57720 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(ffff800020ab1160) 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{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic thread 0xffff800020ab1160 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(ffff800020ab1160) 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{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020a5cea0 rbx 0xffff800020a5cf50 rdx 0xffff800020a5fb30 rcx 0 rax 0 r8 0xffffffff81128163 kprintf+0x173 r9 0x1 r10 0x25 r11 0x1b3bbb23a6348a8b r12 0x3000000008 r13 0xffff800020a5ceb0 r14 0x100 r15 0x1 rip 0xffffffff81dbc048 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020a5ce90 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (reaper) pid=290777 stat=onproc flags process=14000 proc=200 pri=4, usrpri=54, nice=20 forw=0xffffffffffffffff, list=0xffff800020a11638,0xffff800020a5f8c8 process=0xffff800020a4a708 user=0xffff800020a58000, vmspace=0xffffffff82658840 estcpu=4, cpticks=7, pctcpu=0.62 user=0, sys=6, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 24758 202715 97899 32767 2 0x10 syz-executor.1 24758 178121 97899 32767 2 0x4000010 syz-executor.1 75196 65100 81505 32767 3 0x90 nanosleep syz-executor.0 81505 145974 96520 0 3 0x82 wait syz-executor.0 97899 514819 50075 32767 7 0x10 syz-executor.1 50075 201304 96520 0 3 0x82 wait syz-executor.1 52577 237586 0 0 3 0x14200 bored sosplice 96520 231396 52337 0 3 0x82 thrsleep syz-fuzzer 96520 338826 52337 0 3 0x4000082 thrsleep syz-fuzzer 96520 38101 52337 0 3 0x4000082 thrsleep syz-fuzzer 96520 215277 52337 0 3 0x4000082 thrsleep syz-fuzzer 96520 268674 52337 0 3 0x4000082 thrsleep syz-fuzzer 96520 1716 52337 0 3 0x4000082 thrsleep syz-fuzzer 96520 401724 52337 0 3 0x4000082 thrsleep syz-fuzzer 96520 262524 52337 0 3 0x4000082 thrsleep syz-fuzzer 96520 396620 52337 0 3 0x4000082 kqread syz-fuzzer 96520 125830 52337 0 3 0x4000082 thrsleep syz-fuzzer 52337 516933 83784 0 3 0x10008a pause ksh 83784 215195 45740 0 3 0x92 select sshd 95060 219374 1 0 2 0x100083 getty 45740 152818 1 0 3 0x80 select sshd 60021 359665 18455 73 2 0x100010 syslogd 18455 332867 1 0 3 0x100082 netio syslogd 14641 486007 1 77 3 0x100090 poll dhclient 46681 132699 1 0 3 0x80 poll dhclient 73847 153005 0 0 2 0x14200 zerothread 58116 444491 0 0 3 0x14200 aiodoned aiodoned 61910 1933 0 0 3 0x14200 syncer update 43946 343183 0 0 3 0x14200 cleaner cleaner *57720 290777 0 0 7 0x14200 reaper 59836 65994 0 0 3 0x14200 pgdaemon pagedaemon 51341 2870 0 0 3 0x14200 bored crynlk 74075 44193 0 0 3 0x14200 bored crypto 21933 249025 0 0 3 0x40014200 acpi0 acpi0 79206 10441 0 0 3 0x40014200 idle1 31811 418477 0 0 3 0x14200 bored softnet 16238 233304 0 0 3 0x14200 bored systqmp 70543 285766 0 0 3 0x14200 bored systq 55508 431007 0 0 3 0x40014200 bored softclock 59056 212626 0 0 3 0x40014200 idle0 5609 150488 0 0 3 0x14200 bored smr 1 412489 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 60021 (syslogd) thread 0xffff800020ac0500 (359665) exclusive rrwlock inode r = 0 (0xfffffd806eb552b8) #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 9464 6322K 6322K 78643K 11646 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 105 3K 3K 78643K 10087 0 0 ifaddr 36 14K 15K 78643K 1378 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 619 0 0 iov 0 0K 32K 78643K 985 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 6950 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 183 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 1K 1K 78643K 12 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 8 25K 33K 78643K 12984 0 0 sigio 0 0K 0K 78643K 150 0 0 proc 41 38K 70K 78643K 10444 0 0 subproc 34 2K 2K 78643K 3757 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 1503 0 0 in_multi 33 2K 2K 78643K 2804 0 0 ether_multi 1 0K 0K 78643K 69 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 3940 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 43246 0 0 UVM aobj 130 6K 6K 78643K 154 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 880 0 0 NDP 5 0K 0K 78643K 666 0 0 temp 121 3554K 3650K 78643K 55749 0 0 kqueue 0 0K 0K 78643K 192 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 64 448 0 442 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 1038 0 1036 1 0 1 1 0 8 0 rtentry 112 2458 0 2414 2 0 2 2 0 8 0 unpcb 120 5543 0 5535 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 1290 0 1290 1 1 0 1 0 8 0 tcpcb 544 2961 0 2957 1 0 1 1 0 8 0 ipq 40 25 0 25 14 14 0 1 0 8 0 ipqe 40 61 0 61 14 14 0 1 0 8 0 inpcb 280 7357 0 7342 20 18 2 2 0 8 0 nd6 48 663 0 657 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 10050 0 9856 22 9 13 13 0 8 0 art_table 32 10051 0 9856 2 0 2 2 0 8 0 art_node 16 2457 0 2417 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 10 1 0 1 1 0 8 0 semapl 112 10 0 0 1 0 1 1 0 8 0 shmpl 112 152 0 24 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 14991 0 13539 48 1 47 48 0 8 0 ffsino 272 14991 0 13539 100 2 98 98 0 8 0 nchpl 144 30536 0 28906 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 128221 0 128221 3 2 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 87119 0 87119 59 57 2 7 0 8 2 plimitpl 152 2268 0 2259 1 0 1 1 0 8 0 sigapl 432 12498 0 12482 15 13 2 3 0 8 0 futexpl 56 126984 0 126984 3 2 1 1 0 8 1 knotepl 112 7275 0 7256 3 2 1 2 0 8 0 kqueuepl 104 3051 0 3049 1 0 1 1 0 8 0 pipepl 112 8124 0 8105 15 14 1 2 0 8 0 fdescpl 488 12499 0 12482 3 0 3 3 0 8 0 filepl 152 78158 0 78060 18 13 5 7 0 8 0 lockfpl 104 2207 0 2207 11 10 1 1 0 8 1 lockfspl 48 717 0 717 11 10 1 1 0 8 1 sessionpl 112 236 0 226 1 0 1 1 0 8 0 pgrppl 48 352 0 342 1 0 1 1 0 8 0 ucredpl 96 22228 0 22219 1 0 1 1 0 8 0 zombiepl 144 12483 0 12482 1 0 1 1 0 8 0 processpl 896 12515 0 12482 4 0 4 4 0 8 0 procpl 632 33238 0 33194 35 31 4 5 0 8 0 srpgc 64 438 0 438 49 48 1 1 0 8 1 sosppl 128 274 0 274 41 41 0 1 0 8 0 sockpl 384 14236 0 14219 14 11 3 5 0 8 1 mcl64k 65536 32 0 0 4 2 2 3 0 8 0 mcl16k 16384 9 0 0 2 0 2 2 0 8 0 mcl12k 12288 62 0 0 2 0 2 2 0 8 0 mcl9k 9216 33 0 0 2 0 2 2 0 8 0 mcl8k 8192 25 0 0 3 1 2 3 0 8 0 mcl4k 4096 40 0 0 4 2 2 3 0 8 0 mcl2k2 2112 9 0 0 1 0 1 1 0 8 0 mcl2k 2048 167 0 0 18 5 13 18 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 811 0 0 14 2 12 13 0 8 0 bufpl 256 27091 0 20077 439 0 439 439 0 8 0 anonpl 16 1375803 0 1369359 210 164 46 48 0 124 3 amapchunkpl 152 97801 0 97704 142 136 6 18 0 158 0 amappl16 192 58370 0 57982 359 330 29 33 0 8 8 amappl15 184 2129 0 2129 20 20 0 1 0 8 0 amappl14 176 3342 0 3330 1 0 1 1 0 8 0 amappl13 168 2064 0 2061 20 19 1 1 0 8 0 amappl12 160 1345 0 1344 2 1 1 1 0 8 0 amappl11 152 1679 0 1668 1 0 1 1 0 8 0 amappl10 144 1745 0 1741 1 0 1 1 0 8 0 amappl9 136 4515 0 4510 1 0 1 1 0 8 0 amappl8 128 3634 0 3597 4 2 2 2 0 8 0 amappl7 120 2156 0 2148 1 0 1 1 0 8 0 amappl6 112 1166 0 1157 1 0 1 1 0 8 0 amappl5 104 3034 0 3022 1 0 1 1 0 8 0 amappl4 96 12164 0 12135 1 0 1 1 0 8 0 amappl3 88 3670 0 3659 1 0 1 1 0 8 0 amappl2 80 83516 0 83440 3 1 2 3 0 8 0 amappl1 72 341697 0 341245 23 13 10 19 0 8 0 amappl 80 36943 0 36903 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 64 153 0 24 3 0 3 3 0 8 0 uaddrrnd 24 12499 0 12482 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 12499 0 12482 1 0 1 1 0 8 0 vmmpekpl 168 103590 0 103561 2 0 2 2 0 8 0 vmmpepl 168 1602916 0 1601225 336 249 87 93 0 357 13 vmsppl 368 12498 0 12482 2 0 2 2 0 8 0 pdppl 4096 25005 0 24964 6 0 6 6 0 8 0 pvpl 32 3648081 0 3638316 554 436 118 128 0 265 12 pmappl 232 12498 0 12482 24 23 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 624 0 27 18 0 18 18 0 8 0