witness: userret: returning with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd807224a700) #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_seek+0xc9 vn_lock sys/kern/vfs_vnops.c:561 [inline] #4 vn_seek+0xc9 sys/kern/vfs_vnops.c:611 #5 sys_lseek+0x6f sys/kern/vfs_syscalls.c:1859 #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 panic: witness_warn Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 25553 91704 32767 0x10 0x4000000 1 syz-executor.1 284989 70055 73 0x100010 0 0 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,ffffffff8220e320) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff8220e320) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020a889f8) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800024fbf930) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800024fbf930) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,0,ffffffffffffff87,0,4,fb06a2871b0) at Xsyscall+0x128 end of kernel end trace frame: 0xfb320ae1520, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic witness_warn 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_warn(2,0,ffffffff8220e320) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff8220e320) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020a889f8) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800024fbf930) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800024fbf930) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,0,ffffffffffffff87,0,4,fb06a2871b0) at Xsyscall+0x128 end of kernel end trace frame: 0xfb320ae1520, count: -6 ddb{1}> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024fbf670 rbx 0xffff800024fbf720 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff80002313e000 rax 0xffff800000a70680 r8 0xffffffff81128163 kprintf+0x173 r9 0x1 r10 0x25 r11 0x44dc1fc7777cf4fd r12 0x3000000008 r13 0xffff800024fbf680 r14 0x100 r15 0x1 rip 0xffffffff81dbc048 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024fbf660 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=25553 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020a893d8,0xffffffff8263dfe0 process=0xffff800020a8b510 user=0xffff800024fba000, vmspace=0xfffffd807f00c450 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=4, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 91704 343213 48862 32767 2 0x10 syz-executor.1 91704 177513 48862 32767 2 0x4000010 syz-executor.1 91704 425230 48862 32767 3 0x4000090 fsleep syz-executor.1 *91704 25553 48862 32767 7 0x4000010 syz-executor.1 62094 329371 34375 32767 3 0x90 nanosleep syz-executor.0 62094 76558 34375 32767 3 0x4000090 ttyout syz-executor.0 62094 412314 34375 32767 3 0x4000090 fsleep syz-executor.0 48862 416181 76950 32767 2 0x490 syz-executor.1 76950 508833 26421 0 3 0x82 wait syz-executor.1 34375 486134 91589 32767 3 0x90 nanosleep syz-executor.0 91589 426935 26421 0 3 0x82 wait syz-executor.0 31769 518044 0 0 3 0x14200 bored sosplice 26421 181193 27494 0 3 0x82 thrsleep syz-fuzzer 26421 72109 27494 0 2 0x4000482 syz-fuzzer 26421 485585 27494 0 3 0x4000082 thrsleep syz-fuzzer 26421 330288 27494 0 3 0x4000082 thrsleep syz-fuzzer 26421 331403 27494 0 3 0x4000082 thrsleep syz-fuzzer 26421 243738 27494 0 3 0x4000082 thrsleep syz-fuzzer 26421 400431 27494 0 3 0x4000082 thrsleep syz-fuzzer 26421 347152 27494 0 3 0x4000082 kqread syz-fuzzer 26421 277809 27494 0 3 0x4000082 thrsleep syz-fuzzer 26421 197431 27494 0 3 0x4000082 thrsleep syz-fuzzer 27494 262157 33971 0 3 0x10008a pause ksh 33971 363824 2201 0 3 0x92 select sshd 18646 123676 1 0 3 0x100083 ttyin getty 2201 474755 1 0 3 0x80 select sshd 70055 284989 4717 73 7 0x100010 syslogd 4717 250206 1 0 3 0x100082 netio syslogd 52996 1839 1 77 3 0x100090 poll dhclient 51870 304325 1 0 3 0x80 poll dhclient 40985 102548 0 0 3 0x14200 pgzero zerothread 95342 398776 0 0 3 0x14200 aiodoned aiodoned 79534 295214 0 0 3 0x14200 syncer update 58033 22712 0 0 3 0x14200 cleaner cleaner 33915 17177 0 0 3 0x14200 reaper reaper 51036 164610 0 0 3 0x14200 pgdaemon pagedaemon 42276 245012 0 0 3 0x14200 bored crynlk 58607 56034 0 0 3 0x14200 bored crypto 4941 287035 0 0 3 0x40014200 acpi0 acpi0 62809 413167 0 0 3 0x40014200 idle1 89730 160634 0 0 3 0x14200 bored softnet 17863 131576 0 0 3 0x14200 bored systqmp 98562 496232 0 0 3 0x14200 bored systq 17099 219289 0 0 3 0x40014200 bored softclock 22544 182813 0 0 3 0x40014200 idle0 72354 297540 0 0 3 0x14200 bored smr 1 62959 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 91704 (syz-executor.1) thread 0xffff800020a889f8 (25553) exclusive rrwlock inode r = 0 (0xfffffd807224a700) #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_seek+0xc9 vn_lock sys/kern/vfs_vnops.c:561 [inline] #4 vn_seek+0xc9 sys/kern/vfs_vnops.c:611 #5 sys_lseek+0x6f sys/kern/vfs_syscalls.c:1859 #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 Process 70055 (syslogd) thread 0xffff800020ac1158 (284989) exclusive rrwlock inode r = 0 (0xfffffd806eb5a2b8) #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 9463 6322K 6322K 78643K 12345 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 105 3K 3K 78643K 16308 0 0 ifaddr 38 18K 21K 78643K 2233 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 890 0 0 iov 0 0K 28K 78643K 1595 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 10089 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 207 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 2003 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 8 25K 33K 78643K 21328 0 0 sigio 0 0K 0K 78643K 188 0 0 proc 41 38K 78K 78643K 16847 0 0 subproc 34 2K 2K 78643K 6137 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 2593 0 0 in_multi 33 2K 2K 78643K 4473 0 0 ether_multi 1 0K 0K 78643K 97 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 66 291K 291K 78643K 66 0 0 exec 0 0K 1K 78643K 6495 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 164 25K 35K 78643K 67507 0 0 UVM aobj 130 4K 4K 78643K 134 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 953 0 0 NDP 7 0K 0K 78643K 1086 0 0 temp 121 3554K 3634K 78643K 89184 0 0 kqueue 0 0K 0K 78643K 221 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 64 727 0 721 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 1582 0 1580 1 0 1 1 0 8 0 rtentry 112 3997 0 3953 2 0 2 2 0 8 0 unpcb 120 6278 0 6270 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 sackhl 24 6 0 6 5 5 0 1 0 8 0 tcpqe 32 189 0 189 14 14 0 1 0 8 0 tcpcb 544 4779 0 4775 1 0 1 1 0 8 0 ipq 40 23 0 23 12 12 0 1 0 8 0 ipqe 40 74 0 74 12 12 0 1 0 8 0 inpcb 280 12620 0 12611 11 10 1 2 0 8 0 nd6 48 1083 0 1077 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 16397 0 16203 27 14 13 13 0 8 0 art_table 32 16398 0 16203 2 0 2 2 0 8 0 art_node 16 3996 0 3956 1 0 1 1 0 8 0 sysvmsgpl 40 35 0 35 1 1 0 1 0 8 0 semapl 112 2001 0 1991 1 0 1 1 0 8 0 shmpl 112 132 0 4 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 23094 0 21621 48 0 48 48 0 8 0 ffsino 272 23094 0 21621 101 2 99 99 0 8 0 nchpl 144 47848 0 46216 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 196074 0 196074 5 4 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 146534 0 146534 85 83 2 7 0 8 2 plimitpl 152 4473 0 4463 1 0 1 1 0 8 0 sigapl 432 20422 0 20406 15 13 2 3 0 8 0 futexpl 56 184794 0 184792 10 9 1 1 0 8 0 knotepl 112 11208 0 11189 1 0 1 1 0 8 0 kqueuepl 104 4271 0 4269 1 0 1 1 0 8 0 pipepl 112 10640 0 10621 16 15 1 2 0 8 0 fdescpl 488 20423 0 20406 6 3 3 3 0 8 0 filepl 152 116613 0 116507 41 36 5 7 0 8 0 lockfpl 104 2955 0 2955 40 39 1 1 0 8 1 lockfspl 48 957 0 957 40 39 1 1 0 8 1 sessionpl 112 376 0 366 1 0 1 1 0 8 0 pgrppl 48 544 0 534 1 0 1 1 0 8 0 ucredpl 96 34234 0 34225 1 0 1 1 0 8 0 zombiepl 144 20406 0 20406 8 7 1 1 0 8 1 processpl 896 20439 0 20406 4 0 4 4 0 8 0 procpl 632 51450 0 51403 54 49 5 5 0 8 1 srpgc 64 718 0 718 53 52 1 1 0 8 1 sosppl 128 265 0 265 61 60 1 1 0 8 1 sockpl 384 20715 0 20698 22 19 3 4 0 8 1 mcl64k 65536 42 0 0 6 4 2 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 84 0 0 2 0 2 2 0 8 0 mcl9k 9216 57 0 0 2 0 2 2 0 8 0 mcl8k 8192 33 0 0 4 1 3 3 0 8 0 mcl4k 4096 31 0 0 4 1 3 3 0 8 0 mcl2k2 2112 23 0 0 2 0 2 2 0 8 0 mcl2k 2048 572 0 0 14 5 9 12 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1210 0 0 13 2 11 13 0 8 0 bufpl 256 59238 0 52224 439 0 439 439 0 8 0 anonpl 16 2101762 0 2096248 132 92 40 42 0 124 0 amapchunkpl 152 155572 0 155479 225 220 5 18 0 158 1 amappl16 192 93320 0 93037 494 474 20 29 0 8 4 amappl15 184 3495 0 3494 1 0 1 1 0 8 0 amappl14 176 5407 0 5395 1 0 1 1 0 8 0 amappl13 168 2626 0 2624 38 37 1 1 0 8 0 amappl12 160 1522 0 1516 1 0 1 1 0 8 0 amappl11 152 2754 0 2743 1 0 1 1 0 8 0 amappl10 144 2943 0 2934 1 0 1 1 0 8 0 amappl9 136 8248 0 8240 1 0 1 1 0 8 0 amappl8 128 7046 0 6915 9 4 5 5 0 8 0 amappl7 120 3661 0 3652 1 0 1 1 0 8 0 amappl6 112 1969 0 1947 1 0 1 1 0 8 0 amappl5 104 4287 0 4276 1 0 1 1 0 8 0 amappl4 96 19448 0 19404 11 9 2 2 0 8 0 amappl3 88 6031 0 6018 1 0 1 1 0 8 0 amappl2 80 135977 0 135890 4 2 2 3 0 8 0 amappl1 72 539500 0 539028 25 15 10 19 0 8 0 amappl 80 57457 0 57418 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 64 133 0 4 3 0 3 3 0 8 0 uaddrrnd 24 20423 0 20406 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 20423 0 20406 1 0 1 1 0 8 0 vmmpekpl 168 155838 0 155807 3 1 2 3 0 8 0 vmmpepl 168 2557015 0 2555248 486 398 88 96 0 357 8 vmsppl 368 20422 0 20406 2 0 2 2 0 8 0 pdppl 4096 40853 0 40812 10 4 6 6 0 8 0 pvpl 32 5882232 0 5873330 672 567 105 119 0 265 0 pmappl 232 20422 0 20406 37 35 2 2 0 8 1 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 635 0 39 18 0 18 18 0 8 0