witness: userret: returning with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd8069b86700) #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_read+0xa9 vn_lock sys/kern/vfs_vnops.c:561 [inline] #4 vn_read+0xa9 sys/kern/vfs_vnops.c:348 #5 dofilereadv+0x1a2 sys/kern/sys_generic.c:236 #6 sys_readv+0xa7 sys/kern/sys_generic.c:183 #7 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #7 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #8 Xsyscall+0x128 panic: witness_warn Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *239236 60375 32767 0x10 0x4000000 1 syz-executor.1 148004 77155 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,ffffffff82206bf9) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff82206bf9) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020a88780) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800024fc74e0) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800024fc74e0) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,0,ffffffffffffffbb,0,3,2badb29a010) at Xsyscall+0x128 end of kernel end trace frame: 0x2bd7a288250, 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,ffffffff82206bf9) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff82206bf9) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020a88780) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800024fc74e0) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800024fc74e0) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,0,ffffffffffffffbb,0,3,2badb29a010) at Xsyscall+0x128 end of kernel end trace frame: 0x2bd7a288250, count: -6 ddb{1}> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024fc7220 rbx 0xffff800024fc72d0 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022d5c000 rax 0xffff800000a743c0 r8 0xffffffff810b5403 kprintf+0x173 r9 0x1 r10 0x25 r11 0xa46671d8afabd807 r12 0x3000000008 r13 0xffff800024fc7230 r14 0x100 r15 0x1 rip 0xffffffff81b39f38 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024fc7210 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=239236 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020a89160,0xffff800020a88518 process=0xffff800020adce00 user=0xffff800024fc2000, vmspace=0xfffffd806e8b48a8 estcpu=36, cpticks=5, pctcpu=0.0 user=0, sys=5, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 60375 42712 42195 32767 2 0x10 syz-executor.1 *60375 239236 42195 32767 7 0x4000010 syz-executor.1 60375 456246 42195 32767 2 0x4000010 syz-executor.1 60375 442867 42195 32767 2 0x4000010 syz-executor.1 60375 342005 42195 32767 2 0x4000010 syz-executor.1 42195 238189 72602 32767 3 0x90 nanosleep syz-executor.1 72602 357513 57097 0 3 0x82 wait syz-executor.1 76260 227474 68400 32767 2 0x10 syz-executor.0 68400 464961 57097 0 3 0x82 wait syz-executor.0 18652 389954 0 0 3 0x14200 bored sosplice 57097 33529 30136 0 3 0x82 thrsleep syz-fuzzer 57097 77050 30136 0 3 0x4000082 thrsleep syz-fuzzer 57097 142303 30136 0 3 0x4000082 thrsleep syz-fuzzer 57097 488974 30136 0 3 0x4000082 thrsleep syz-fuzzer 57097 403274 30136 0 3 0x4000082 thrsleep syz-fuzzer 57097 134813 30136 0 3 0x4000082 thrsleep syz-fuzzer 57097 352006 30136 0 3 0x4000082 thrsleep syz-fuzzer 57097 163138 30136 0 3 0x4000082 thrsleep syz-fuzzer 57097 47145 30136 0 3 0x4000082 kqread syz-fuzzer 57097 283354 30136 0 3 0x4000082 thrsleep syz-fuzzer 30136 497647 20001 0 3 0x10008a pause ksh 20001 115258 65086 0 3 0x92 select sshd 88242 54450 1 0 3 0x100083 ttyin getty 65086 515451 1 0 3 0x80 select sshd 77155 148004 1882 73 7 0x100010 syslogd 1882 158050 1 0 3 0x100082 netio syslogd 88042 10840 1 77 3 0x100090 poll dhclient 20199 449115 1 0 3 0x80 poll dhclient 54631 1583 0 0 3 0x14200 pgzero zerothread 15953 245705 0 0 3 0x14200 aiodoned aiodoned 77953 135099 0 0 3 0x14200 syncer update 46305 341260 0 0 3 0x14200 cleaner cleaner 82835 294323 0 0 3 0x14200 reaper reaper 22497 283167 0 0 3 0x14200 pgdaemon pagedaemon 82264 417833 0 0 3 0x14200 bored crynlk 53489 286416 0 0 3 0x14200 bored crypto 97829 296468 0 0 3 0x40014200 acpi0 acpi0 30438 260757 0 0 3 0x40014200 idle1 65498 75160 0 0 3 0x14200 bored softnet 9642 514576 0 0 3 0x14200 bored systqmp 49355 222098 0 0 3 0x14200 bored systq 72784 29251 0 0 3 0x40014200 bored softclock 58644 321373 0 0 3 0x40014200 idle0 16216 124998 0 0 3 0x14200 bored smr 1 27539 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 60375 (syz-executor.1) thread 0xffff800020a88780 (239236) exclusive rrwlock inode r = 0 (0xfffffd8069b86700) #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_read+0xa9 vn_lock sys/kern/vfs_vnops.c:561 [inline] #4 vn_read+0xa9 sys/kern/vfs_vnops.c:348 #5 dofilereadv+0x1a2 sys/kern/sys_generic.c:236 #6 sys_readv+0xa7 sys/kern/sys_generic.c:183 #7 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #7 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #8 Xsyscall+0x128 Process 76260 (syz-executor.0) thread 0xffff800020a89650 (227474) exclusive rrwlock inode r = 0 (0xfffffd8069321b40) #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 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x13e sys/ufs/ffs/ffs_vfsops.c:1352 #5 ffs_inode_alloc+0x1cf sys/ufs/ffs/ffs_alloc.c:392 #6 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1164 #7 VOP_MKDIR+0xce sys/kern/vfs_vops.c:449 #8 domkdirat+0x121 sys/kern/vfs_syscalls.c:2983 #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 exclusive rrwlock inode r = 0 (0xfffffd8069321f80) #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 vfs_lookup+0xec sys/kern/vfs_lookup.c:418 #6 namei+0x61c sys/kern/vfs_lookup.c:248 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:2968 #8 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #8 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #9 Xsyscall+0x128 Process 77155 (syslogd) thread 0xffff800020ac09f0 (148004) exclusive rrwlock inode r = 0 (0xfffffd806eb492b8) #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 9462 6321K 6321K 78643K 10864 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 105 3K 3K 78643K 3018 0 0 ifaddr 35 11K 12K 78643K 427 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 176 0 0 iov 0 0K 32K 78643K 279 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 2795 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 60 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 425 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 7 21K 33K 78643K 3555 0 0 sigio 0 0K 0K 78643K 37 0 0 proc 41 38K 70K 78643K 3246 0 0 subproc 34 2K 2K 78643K 1105 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 419 0 0 in_multi 33 2K 2K 78643K 803 0 0 ether_multi 1 0K 0K 78643K 18 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 60 265K 265K 78643K 60 0 0 exec 0 0K 1K 78643K 1235 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 98 21K 30K 78643K 12345 0 0 UVM aobj 130 4K 4K 78643K 140 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 204 0 0 NDP 5 0K 0K 78643K 198 0 0 temp 121 3554K 3630K 78643K 17756 0 0 kqueue 0 0K 0K 78643K 39 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 64 135 0 129 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 320 0 318 1 0 1 1 0 8 0 rtentry 112 741 0 697 2 0 2 2 0 8 0 unpcb 120 1444 0 1436 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 5249 0 5249 2 2 0 2 0 8 0 tcpcb 544 878 0 874 1 0 1 1 0 8 0 ipq 40 9 0 9 4 4 0 1 0 8 0 ipqe 40 21 0 21 4 4 0 1 0 8 0 inpcb 280 2010 0 2001 7 6 1 2 0 8 0 nd6 48 195 0 189 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 3036 0 2844 14 2 12 13 0 8 0 art_table 32 3037 0 2844 2 0 2 2 0 8 0 art_node 16 740 0 700 1 0 1 1 0 8 0 sysvmsgpl 40 34 0 17 1 0 1 1 0 8 0 semapl 112 423 0 413 1 0 1 1 0 8 0 shmpl 112 138 0 10 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 5004 0 3573 48 1 47 47 0 8 0 ffsino 272 5004 0 3573 98 2 96 96 0 8 0 nchpl 144 9341 0 7713 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 37315 0 37314 3 2 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 26143 0 26143 23 22 1 7 0 8 1 plimitpl 152 646 0 637 1 0 1 1 0 8 0 sigapl 432 3537 0 3522 6 4 2 3 0 8 0 futexpl 56 34087 0 34087 1 0 1 1 0 8 1 knotepl 112 2003 0 1984 1 0 1 1 0 8 0 kqueuepl 104 729 0 727 1 0 1 1 0 8 0 pipepl 112 2460 0 2441 9 7 2 2 0 8 1 fdescpl 488 3538 0 3522 3 0 3 3 0 8 0 filepl 152 21473 0 21371 12 5 7 7 0 8 2 lockfpl 104 570 0 570 6 5 1 1 0 8 1 lockfspl 48 178 0 178 6 5 1 1 0 8 1 sessionpl 112 80 0 70 1 0 1 1 0 8 0 pgrppl 48 139 0 129 1 0 1 1 0 8 0 ucredpl 96 5683 0 5674 1 0 1 1 0 8 0 zombiepl 144 3522 0 3522 3 2 1 1 0 8 1 processpl 896 3554 0 3522 4 0 4 4 0 8 0 procpl 632 9002 0 8957 18 13 5 5 0 8 1 srpgc 64 126 0 126 12 12 0 1 0 8 0 sosppl 128 68 0 68 13 12 1 1 0 8 1 sockpl 384 3835 0 3818 5 1 4 4 0 8 2 mcl64k 65536 16 0 0 2 0 2 2 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 21 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 14 0 0 2 0 2 2 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 207 0 0 24 4 20 24 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 348 0 0 14 0 14 14 0 8 0 bufpl 256 10551 0 3537 439 0 439 439 0 8 0 anonpl 16 379464 0 372194 141 95 46 47 0 124 12 amapchunkpl 152 27800 0 27710 42 36 6 18 0 158 0 amappl16 192 15411 0 15019 115 87 28 32 0 8 8 amappl15 184 793 0 791 8 7 1 1 0 8 0 amappl14 176 922 0 917 1 0 1 1 0 8 0 amappl13 168 217 0 216 1 0 1 1 0 8 0 amappl12 160 301 0 299 1 0 1 1 0 8 0 amappl11 152 801 0 788 1 0 1 1 0 8 0 amappl10 144 532 0 530 2 1 1 1 0 8 0 amappl9 136 1671 0 1668 1 0 1 1 0 8 0 amappl8 128 1045 0 1018 3 1 2 2 0 8 0 amappl7 120 628 0 618 1 0 1 1 0 8 0 amappl6 112 613 0 604 1 0 1 1 0 8 0 amappl5 104 766 0 756 1 0 1 1 0 8 0 amappl4 96 3715 0 3688 2 1 1 2 0 8 0 amappl3 88 791 0 780 1 0 1 1 0 8 0 amappl2 80 23122 0 23052 4 2 2 3 0 8 0 amappl1 72 102401 0 101958 23 13 10 19 0 8 0 amappl 80 10232 0 10195 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 64 139 0 10 3 0 3 3 0 8 0 uaddrrnd 24 3538 0 3522 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3538 0 3522 1 0 1 1 0 8 0 vmmpekpl 168 33142 0 33112 2 0 2 2 0 8 0 vmmpepl 168 456009 0 454417 174 89 85 92 0 357 10 vmsppl 368 3537 0 3522 2 0 2 2 0 8 0 pdppl 4096 7083 0 7044 6 0 6 6 0 8 0 pvpl 32 1062092 0 1051569 290 169 121 124 0 265 33 pmappl 232 3537 0 3522 7 6 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 615 0 12 18 0 18 18 0 8 0