witness: userret: returning with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd8072f59a30) #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_open+0x431 sys/kern/spec_vnops.c:159 #6 VOP_OPEN+0x6a sys/kern/vfs_vops.c:153 #7 vn_open+0x495 sys/kern/vfs_vnops.c:174 #8 sys_ktrace+0x86 sys/kern/kern_ktrace.c:517 #9 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #9 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #10 Xsyscall+0x128 panic: witness_warn Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 92911 71786 0 0 0x4000000 0 syz-executor.1 180721 10353 73 0x100010 0 1 syslogd 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,ffffffff82205ab0) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff82205ab0) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020acea08) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800021166fd0) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800021166fd0) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,d,ffffffffffffff82,0,4,d43ea7ff0e0) at Xsyscall+0x128 end of kernel end trace frame: 0xd462a6439f0, 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,ffffffff82205ab0) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff82205ab0) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020acea08) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800021166fd0) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800021166fd0) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,d,ffffffffffffff82,0,4,d43ea7ff0e0) at Xsyscall+0x128 end of kernel end trace frame: 0xd462a6439f0, count: -6 ddb{0}> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800021166d10 rbx 0xffff800021166dc0 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff8000237ac000 rax 0xffff800000a427c0 r8 0xffffffff8145b623 kprintf+0x173 r9 0x1 r10 0x25 r11 0x3dac266e5b87255f r12 0x3000000008 r13 0xffff800021166d20 r14 0x100 r15 0x1 rip 0xffffffff81c821e8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021166d00 ss 0 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=92911 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ace790,0xffff800020acfb60 process=0xffff800020adc380 user=0xffff800021162000, vmspace=0xfffffd807f00b730 estcpu=36, cpticks=5, pctcpu=0.0 user=0, sys=5, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 71786 504886 80960 0 3 0x80 nanosleep syz-executor.1 71786 1698 80960 0 3 0x4000000 inode syz-executor.1 *71786 92911 80960 0 7 0x4000000 syz-executor.1 71786 22806 80960 0 3 0x4000080 fsleep syz-executor.1 71786 177236 80960 0 3 0x4000080 fsleep syz-executor.1 80960 349440 83329 0 3 0x82 nanosleep syz-executor.1 8679 444643 83329 0 3 0x82 nanosleep syz-executor.0 63030 393218 0 0 3 0x14200 bored sosplice 83329 386801 64731 0 3 0x82 kqread syz-fuzzer 83329 200428 64731 0 3 0x4000082 thrsleep syz-fuzzer 83329 66069 64731 0 3 0x4000082 thrsleep syz-fuzzer 83329 6522 64731 0 3 0x4000082 thrsleep syz-fuzzer 83329 501084 64731 0 3 0x4000082 thrsleep syz-fuzzer 83329 186913 64731 0 3 0x4000082 thrsleep syz-fuzzer 83329 471568 64731 0 3 0x4000082 thrsleep syz-fuzzer 83329 452418 64731 0 3 0x4000082 thrsleep syz-fuzzer 83329 409964 64731 0 3 0x4000082 thrsleep syz-fuzzer 83329 6817 64731 0 3 0x4000082 thrsleep syz-fuzzer 64731 454439 47551 0 3 0x10008a pause ksh 47551 142117 64508 0 3 0x92 select sshd 58707 410252 1 0 3 0x100083 ttyin getty 64508 492577 1 0 3 0x80 select sshd 47891 306876 61933 74 3 0x100092 bpf pflogd 61933 253678 1 0 3 0x80 netio pflogd 10353 180721 54650 73 7 0x100010 syslogd 54650 2398 1 0 3 0x100082 netio syslogd 96838 394728 0 0 3 0x14200 pgzero zerothread 37543 517507 0 0 3 0x14200 aiodoned aiodoned 57737 13620 0 0 3 0x14200 syncer update 78221 267077 0 0 3 0x14200 cleaner cleaner 10518 111337 0 0 3 0x14200 reaper reaper 25079 423729 0 0 3 0x14200 pgdaemon pagedaemon 87737 11550 0 0 3 0x14200 bored crynlk 75703 469396 0 0 3 0x14200 bored crypto 13821 361768 0 0 3 0x40014200 acpi0 acpi0 70558 130263 0 0 3 0x40014200 idle1 74465 432991 0 0 3 0x14200 bored softnet 90152 191134 0 0 3 0x14200 bored systqmp 64446 428133 0 0 3 0x14200 bored systq 34920 348185 0 0 3 0x40014200 bored softclock 14160 83481 0 0 3 0x40014200 idle0 15973 360058 0 0 3 0x14200 bored smr 1 182656 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 71786 (syz-executor.1) thread 0xffff800020acea08 (92911) exclusive rrwlock inode r = 0 (0xfffffd8072f59a30) #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_open+0x431 sys/kern/spec_vnops.c:159 #6 VOP_OPEN+0x6a sys/kern/vfs_vops.c:153 #7 vn_open+0x495 sys/kern/vfs_vnops.c:174 #8 sys_ktrace+0x86 sys/kern/kern_ktrace.c:517 #9 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #9 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #10 Xsyscall+0x128 Process 10353 (syslogd) thread 0xffff800020ac0500 (180721) exclusive rrwlock inode r = 0 (0xfffffd806ec41d58) #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 9580 6382K 10624K 78643K 19242 0 0 pcb 13 8K 8K 78643K 286 0 0 rtable 113 4K 5K 78643K 1155 0 0 ifaddr 81 17K 18K 78643K 502 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1624 0 0 iov 0 0K 24K 78643K 442 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1206 76K 77K 78643K 4498 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 61 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 339 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 3501 0 0 sigio 0 0K 0K 78643K 57 0 0 proc 54 51K 83K 78643K 1190 0 0 subproc 32 2K 2K 78643K 238 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 298 0 0 in_multi 33 2K 2K 78643K 242 0 0 ether_multi 1 0K 0K 78643K 8 0 0 mrt 0 0K 0K 78643K 9 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 108 477K 477K 78643K 108 0 0 exec 0 0K 1K 78643K 594 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 92 21K 30K 78643K 12446 0 0 UVM aobj 130 6K 6K 78643K 149 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 142 0 0 NDP 19 0K 0K 78643K 151 0 0 temp 222 3544K 4177K 78643K 39354 0 0 kqueue 0 0K 0K 78643K 13 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 32 0 25 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 133 0 133 7 7 0 1 0 8 0 rtentry 112 180 0 135 2 0 2 2 0 8 0 unpcb 120 1068 0 1060 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 8820 0 8820 3 3 0 2 0 8 0 tcpcb 544 537 0 533 1 0 1 1 0 8 0 inpcb 280 1653 0 1647 2 1 1 2 0 8 0 rttmr 72 1 0 1 1 1 0 1 0 8 0 nd6 48 42 0 36 1 0 1 1 0 8 0 pkpcb 40 16 0 16 6 6 0 1 0 8 0 swfcl 56 10 0 0 1 0 1 1 0 8 0 ppxss 1128 71 0 71 10 10 0 1 0 8 0 pffrag 232 5 0 5 3 3 0 1 0 482 0 pffrnode 88 5 0 5 3 3 0 1 0 8 0 pffrent 40 14 0 14 3 3 0 1 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 103 0 87 1 0 1 1 0 8 0 pfstkey 112 103 0 87 1 0 1 1 0 8 0 pfstate 328 103 0 87 2 0 2 2 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 256 745 0 553 15 2 13 13 0 8 0 art_table 32 746 0 553 2 0 2 2 0 8 0 art_node 16 179 0 138 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 3 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 337 0 327 1 0 1 1 0 8 0 shmpl 112 147 0 19 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 6854 0 5437 47 0 47 47 0 8 0 ffsino 272 6854 0 5437 96 0 96 96 0 8 0 nchpl 144 11863 0 10227 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 38007 0 38007 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 2 0 2 2 2 0 1 0 8 0 scxspl 192 36950 0 36950 19 18 1 7 0 8 1 plimitpl 152 334 0 327 1 0 1 1 0 8 0 sigapl 432 3665 0 3652 3 1 2 3 0 8 0 futexpl 56 40967 0 40965 1 0 1 1 0 8 0 knotepl 112 700 0 681 1 0 1 1 0 8 0 kqueuepl 104 657 0 655 1 0 1 1 0 8 0 pipepl 112 1982 0 1963 5 4 1 2 0 8 0 fdescpl 488 3666 0 3652 3 0 3 3 0 8 0 filepl 152 21155 0 21063 14 10 4 7 0 8 0 lockfpl 104 1151 0 1151 4 3 1 1 0 8 1 lockfspl 48 395 0 395 4 3 1 1 0 8 1 sessionpl 112 30 0 21 1 0 1 1 0 8 0 pgrppl 48 44 0 35 1 0 1 1 0 8 0 ucredpl 96 4130 0 4122 1 0 1 1 0 8 0 zombiepl 144 3654 0 3653 3 2 1 1 0 8 0 processpl 896 3684 0 3653 4 0 4 4 0 8 0 procpl 632 11076 0 11032 6 1 5 5 0 8 0 srpgc 64 25 0 25 9 9 0 1 0 8 0 sosppl 128 36 0 36 11 10 1 1 0 8 1 sockpl 384 2888 0 2876 7 4 3 4 0 8 1 mcl64k 65536 18 0 0 3 0 3 3 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 19 0 0 2 0 2 2 0 8 0 mcl9k 9216 18 0 0 2 0 2 2 0 8 0 mcl8k 8192 13 0 0 2 0 2 2 0 8 0 mcl4k 4096 14 0 0 2 0 2 2 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 216 0 0 24 4 20 24 0 8 0 mtagpl 80 60 0 0 1 0 1 1 0 8 0 mbufpl 256 343 0 0 14 0 14 14 0 8 0 bufpl 256 14394 0 7375 439 0 439 439 0 8 0 anonpl 16 349349 0 338138 136 84 52 66 0 124 0 amapchunkpl 152 22135 0 22031 30 24 6 10 0 158 0 amappl16 192 18465 0 17788 121 86 35 46 0 8 0 amappl15 184 835 0 834 1 0 1 1 0 8 0 amappl14 176 787 0 781 1 0 1 1 0 8 0 amappl13 168 559 0 557 4 3 1 1 0 8 0 amappl12 160 286 0 286 3 3 0 1 0 8 0 amappl11 152 795 0 787 1 0 1 1 0 8 0 amappl10 144 273 0 268 1 0 1 1 0 8 0 amappl9 136 773 0 769 1 0 1 1 0 8 0 amappl8 128 277 0 257 1 0 1 1 0 8 0 amappl7 120 276 0 268 1 0 1 1 0 8 0 amappl6 112 779 0 767 1 0 1 1 0 8 0 amappl5 104 518 0 504 1 0 1 1 0 8 0 amappl4 96 4154 0 4127 2 1 1 2 0 8 0 amappl3 88 890 0 880 1 0 1 1 0 8 0 amappl2 80 28378 0 28312 4 2 2 3 0 8 0 amappl1 72 89915 0 89487 27 17 10 20 0 8 0 amappl 80 11519 0 11484 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 64 148 0 19 3 0 3 3 0 8 0 uaddrrnd 24 3666 0 3652 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3666 0 3652 1 0 1 1 0 8 0 vmmpekpl 168 28816 0 28781 2 0 2 2 0 8 0 vmmpepl 168 449433 0 447690 253 170 83 108 0 357 0 vmsppl 368 3665 0 3652 2 0 2 2 0 8 0 pdppl 4096 7339 0 7304 7 2 5 6 0 8 0 pvpl 32 968660 0 954304 280 152 128 162 0 265 0 pmappl 232 3665 0 3652 4 3 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 616 0 12 18 0 18 18 0 8 0