witness: userret: returning with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd807b15a708) #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_write+0x169 vn_lock sys/kern/vfs_vnops.c:561 [inline] #4 vn_write+0x169 sys/kern/vfs_vnops.c:401 #5 dofilewritev+0x1ac sys/kern/sys_generic.c:364 #6 sys_write+0x83 sys/kern/sys_generic.c:284 #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 *443240 65174 32767 0x1010 0x4080000 0 syz-executor.1 497036 51362 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,ffffffff81fbc9d1) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff81fbc9d1) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020b298d0) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800022de1130) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800022de1130) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,5,c,0,3,7cafb7eb0e0) at Xsyscall+0x128 end of kernel end trace frame: 0x7cd2e36b7a0, 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,ffffffff81fbc9d1) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff81fbc9d1) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020b298d0) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800022de1130) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800022de1130) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,5,c,0,3,7cafb7eb0e0) at Xsyscall+0x128 end of kernel end trace frame: 0x7cd2e36b7a0, count: -6 ddb{0}> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800022de0e70 rbx 0xffff800022de0f20 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800023002000 rax 0xffff8000009f4d80 r8 0xffffffff81265573 kprintf+0x173 r9 0x1 r10 0x25 r11 0xc7ff52e41494d63 r12 0x3000000008 r13 0xffff800022de0e80 r14 0x100 r15 0x1 rip 0xffffffff81a712a8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022de0e60 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=443240 stat=onproc flags process=1010 proc=4080000 pri=32, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff800020b28020,0xffffffff82395800 process=0xffff800020b2ae10 user=0xffff800022ddc000, vmspace=0xfffffd807f00ba10 estcpu=31, cpticks=4, pctcpu=0.0 user=0, sys=4, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 65174 63943 46342 32767 3 0x3010 suspend syz-executor.1 *65174 443240 46342 32767 7 0x4081010 syz-executor.1 46488 241417 63809 32767 3 0x90 piperd syz-executor.0 63809 396645 37140 0 3 0x82 wait syz-executor.0 46342 120287 10308 32767 3 0x90 nanosleep syz-executor.1 10308 186109 37140 0 3 0x82 wait syz-executor.1 15797 296114 0 0 3 0x14200 bored sosplice 37140 367702 53084 0 3 0x82 thrsleep syz-fuzzer 37140 155314 53084 0 3 0x4000082 thrsleep syz-fuzzer 37140 349247 53084 0 3 0x4000082 thrsleep syz-fuzzer 37140 148095 53084 0 3 0x4000082 thrsleep syz-fuzzer 37140 247874 53084 0 3 0x4000082 thrsleep syz-fuzzer 37140 47685 53084 0 3 0x4000082 thrsleep syz-fuzzer 37140 267077 53084 0 3 0x4000082 thrsleep syz-fuzzer 37140 458214 53084 0 3 0x4000082 thrsleep syz-fuzzer 37140 254943 53084 0 3 0x4000082 kqread syz-fuzzer 37140 323424 53084 0 3 0x4000082 thrsleep syz-fuzzer 53084 199710 39402 0 3 0x10008a pause ksh 39402 171470 62024 0 3 0x92 select sshd 3777 340805 1 0 3 0x100083 ttyin getty 62024 457689 1 0 3 0x80 select sshd 51362 497036 93389 73 7 0x100010 syslogd 93389 148109 1 0 3 0x100082 netio syslogd 98844 37996 1 77 3 0x100090 poll dhclient 70474 255437 1 0 3 0x80 poll dhclient 18551 186839 0 0 3 0x14200 pgzero zerothread 54657 518364 0 0 3 0x14200 aiodoned aiodoned 47826 117452 0 0 3 0x14200 syncer update 15743 204981 0 0 3 0x14200 cleaner cleaner 73044 330271 0 0 3 0x14200 reaper reaper 66746 424647 0 0 3 0x14200 pgdaemon pagedaemon 96118 135441 0 0 3 0x14200 bored crynlk 26072 203032 0 0 3 0x14200 bored crypto 43605 5974 0 0 3 0x40014200 acpi0 acpi0 41769 241951 0 0 3 0x40014200 idle1 66888 270292 0 0 3 0x14200 bored softnet 98166 71697 0 0 3 0x14200 bored systqmp 83187 261959 0 0 3 0x14200 bored systq 51817 486748 0 0 3 0x40014200 bored softclock 14973 515268 0 0 3 0x40014200 idle0 31536 363193 0 0 3 0x14200 bored smr 1 432103 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 65174 (syz-executor.1) thread 0xffff800020b298d0 (443240) exclusive rrwlock inode r = 0 (0xfffffd807b15a708) #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_write+0x169 vn_lock sys/kern/vfs_vnops.c:561 [inline] #4 vn_write+0x169 sys/kern/vfs_vnops.c:401 #5 dofilewritev+0x1ac sys/kern/sys_generic.c:364 #6 sys_write+0x83 sys/kern/sys_generic.c:284 #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 51362 (syslogd) thread 0xffff800020b60010 (497036) exclusive rrwlock inode r = 0 (0xfffffd806eb943c8) #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 9463 6322K 6322K 78643K 12085 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 105 3K 3K 78643K 13954 0 0 ifaddr 36 18K 21K 78643K 1913 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 716 0 0 iov 0 0K 32K 78643K 1250 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 8741 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 191 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 1683 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 7 21K 33K 78643K 16178 0 0 sigio 0 0K 0K 78643K 172 0 0 proc 41 38K 70K 78643K 14126 0 0 subproc 34 2K 2K 78643K 5253 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 2127 0 0 in_multi 33 2K 2K 78643K 3950 0 0 ether_multi 1 0K 0K 78643K 117 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 5163 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 124 23K 32K 78643K 54913 0 0 UVM aobj 130 4K 4K 78643K 150 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 964 0 0 NDP 5 0K 0K 78643K 930 0 0 temp 121 2750K 2828K 78643K 72249 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 64 627 0 621 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 1331 0 1329 1 0 1 1 0 8 0 rtentry 112 3429 0 3385 2 0 2 2 0 8 0 unpcb 120 5575 0 5567 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 4554 0 4554 1 1 0 1 0 8 0 tcpcb 544 3312 0 3308 1 0 1 1 0 8 0 ipq 40 6 0 6 4 4 0 1 0 8 0 ipqe 40 14 0 14 4 4 0 1 0 8 0 inpcb 280 8638 0 8625 22 20 2 2 0 8 0 nd6 48 927 0 921 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 14025 0 13830 32 19 13 13 0 8 0 art_table 32 14026 0 13830 2 0 2 2 0 8 0 art_node 16 3428 0 3388 1 0 1 1 0 8 0 sysvmsgpl 40 26 0 11 1 0 1 1 0 8 0 semapl 112 1681 0 1671 1 0 1 1 0 8 0 shmpl 112 148 0 20 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 17658 0 16198 48 0 48 48 0 8 0 ffsino 272 17658 0 16198 103 5 98 98 0 8 0 nchpl 144 36329 0 34697 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 154798 0 154798 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 105937 0 105937 68 66 2 5 0 8 2 plimitpl 152 2643 0 2634 1 0 1 1 0 8 0 sigapl 432 15428 0 15413 12 10 2 3 0 8 0 futexpl 56 137435 0 137435 1 0 1 1 0 8 1 knotepl 112 9445 0 9426 1 0 1 1 0 8 0 kqueuepl 104 3591 0 3589 1 0 1 1 0 8 0 pipepl 112 10090 0 10071 15 14 1 2 0 8 0 fdescpl 488 15429 0 15413 3 0 3 3 0 8 0 filepl 152 92047 0 91942 21 16 5 7 0 8 0 lockfpl 104 2956 0 2956 14 13 1 1 0 8 1 lockfspl 48 975 0 975 14 13 1 1 0 8 1 sessionpl 112 324 0 314 1 0 1 1 0 8 0 pgrppl 48 519 0 509 1 0 1 1 0 8 0 ucredpl 96 25141 0 25132 1 0 1 1 0 8 0 zombiepl 144 15414 0 15413 2 1 1 1 0 8 0 processpl 896 15445 0 15413 4 0 4 4 0 8 0 procpl 632 41240 0 41198 45 40 5 5 0 8 1 srpgc 64 614 0 614 40 39 1 1 0 8 1 sosppl 128 291 0 291 64 63 1 1 0 8 1 sockpl 384 15858 0 15841 10 7 3 4 0 8 1 mcl64k 65536 27 0 0 4 2 2 3 0 8 0 mcl16k 16384 34 0 0 5 3 2 3 0 8 0 mcl12k 12288 63 0 0 2 0 2 2 0 8 0 mcl9k 9216 52 0 0 3 1 2 2 0 8 0 mcl8k 8192 26 0 0 4 1 3 3 0 8 0 mcl4k 4096 41 0 0 4 1 3 3 0 8 0 mcl2k2 2112 11 0 0 1 0 1 1 0 8 0 mcl2k 2048 143 0 0 14 1 13 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 865 0 0 13 0 13 13 0 8 0 bufpl 256 35068 0 28044 440 0 440 440 0 8 0 anonpl 16 1728403 0 1721925 249 206 43 47 0 125 0 amapchunkpl 152 130552 0 130451 173 167 6 18 0 158 0 amappl16 192 70880 0 70505 412 381 31 32 0 8 10 amappl15 184 2306 0 2304 34 33 1 1 0 8 0 amappl14 176 4733 0 4728 1 0 1 1 0 8 0 amappl13 168 1656 0 1656 33 33 0 1 0 8 0 amappl12 160 2109 0 2104 2 1 1 1 0 8 0 amappl11 152 2791 0 2780 1 0 1 1 0 8 0 amappl10 144 1987 0 1984 5 4 1 1 0 8 0 amappl9 136 5844 0 5840 1 0 1 1 0 8 0 amappl8 128 4582 0 4532 2 0 2 2 0 8 0 amappl7 120 2490 0 2479 1 0 1 1 0 8 0 amappl6 112 2037 0 2023 1 0 1 1 0 8 0 amappl5 104 4279 0 4266 1 0 1 1 0 8 0 amappl4 96 14564 0 14531 2 1 1 2 0 8 0 amappl3 88 4846 0 4834 1 0 1 1 0 8 0 amappl2 80 99938 0 99868 4 2 2 3 0 8 0 amappl1 72 428538 0 428092 23 13 10 19 0 8 0 amappl 80 46340 0 46298 10 8 2 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 64 149 0 20 3 0 3 3 0 8 0 uaddrrnd 24 15429 0 15413 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 15429 0 15413 1 0 1 1 0 8 0 vmmpekpl 168 128034 0 128004 2 0 2 2 0 8 0 vmmpepl 168 1986684 0 1985059 416 330 86 95 0 357 9 vmsppl 368 15428 0 15413 2 0 2 2 0 8 0 pdppl 4096 30865 0 30826 6 0 6 6 0 8 1 pvpl 32 4621659 0 4611716 687 572 115 127 0 265 12 pmappl 232 15428 0 15413 23 22 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 636 0 35 18 0 18 18 0 8 0