witness: userret: returning with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd80698a9d68) #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: witness_warn Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *481800 14461 32767 0x1010 0x4080000 0 syz-executor.1 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,ffffffff81fbcb1e) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff81fbcb1e) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020b28020) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff80002504d890) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff80002504d890) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,290,c,0,3,b6883712010) at Xsyscall+0x128 end of kernel end trace frame: 0xb6b81a82370, 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,ffffffff81fbcb1e) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff81fbcb1e) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020b28020) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff80002504d890) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff80002504d890) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,290,c,0,3,b6883712010) at Xsyscall+0x128 end of kernel end trace frame: 0xb6b81a82370, count: -6 ddb{0}> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff80002504d5d0 rbx 0xffff80002504d680 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800020bf0000 rax 0xffff8000009a7140 r8 0xffffffff816b32f3 kprintf+0x173 r9 0x1 r10 0x25 r11 0x7fdce07e8ffa1715 r12 0x3000000008 r13 0xffff80002504d5e0 r14 0x100 r15 0x1 rip 0xffffffff81bf38b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002504d5c0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=481800 stat=onproc flags process=1010 proc=4080000 pri=32, usrpri=76, nice=20 forw=0xffffffffffffffff, list=0xffff800020b29b48,0xffffffff823a5400 process=0xffff800020b7ca80 user=0xffff800025048000, vmspace=0xfffffd807effe730 estcpu=26, cpticks=5, pctcpu=0.0 user=0, sys=5, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 14461 298170 2665 32767 3 0x3010 suspend syz-executor.1 *14461 481800 2665 32767 7 0x4081010 syz-executor.1 44259 398724 815 32767 3 0x90 nanosleep syz-executor.0 2665 60133 42868 32767 3 0x90 nanosleep syz-executor.1 815 226128 11989 0 3 0x82 wait syz-executor.0 42868 223991 11989 0 3 0x82 wait syz-executor.1 65033 276851 0 0 3 0x14200 bored sosplice 11989 433310 56219 0 3 0x82 thrsleep syz-fuzzer 11989 234603 56219 0 2 0x4000082 syz-fuzzer 11989 109108 56219 0 3 0x4000082 thrsleep syz-fuzzer 11989 441126 56219 0 3 0x4000082 thrsleep syz-fuzzer 11989 34726 56219 0 3 0x4000082 thrsleep syz-fuzzer 11989 9717 56219 0 2 0x4000082 syz-fuzzer 11989 129099 56219 0 3 0x4000082 thrsleep syz-fuzzer 11989 89362 56219 0 3 0x4000082 thrsleep syz-fuzzer 11989 37743 56219 0 3 0x4000082 thrsleep syz-fuzzer 11989 117204 56219 0 3 0x4000082 kqread syz-fuzzer 56219 351392 12 0 3 0x10008a pause ksh 12 153331 55501 0 2 0x92 sshd 10460 296558 1 0 3 0x100083 ttyin getty 55501 81951 1 0 3 0x80 select sshd 32392 12765 58957 73 2 0x100090 syslogd 58957 142074 1 0 3 0x100082 netio syslogd 1389 418409 1 77 3 0x100090 poll dhclient 34536 510424 1 0 3 0x80 poll dhclient 14309 320842 0 0 3 0x14200 pgzero zerothread 1974 399557 0 0 3 0x14200 aiodoned aiodoned 22476 358018 0 0 3 0x14200 syncer update 10940 410924 0 0 3 0x14200 cleaner cleaner 99429 412831 0 0 3 0x14200 reaper reaper 63321 241322 0 0 3 0x14200 pgdaemon pagedaemon 12388 397917 0 0 3 0x14200 bored crynlk 72944 474195 0 0 3 0x14200 bored crypto 86903 47970 0 0 3 0x40014200 acpi0 acpi0 6928 211844 0 0 7 0x40014200 idle1 41924 192860 0 0 3 0x14200 bored softnet 53623 95744 0 0 3 0x14200 bored systqmp 86666 297779 0 0 3 0x14200 bored systq 52303 379838 0 0 2 0x40014200 softclock 90064 482960 0 0 3 0x40014200 idle0 97716 144117 0 0 3 0x14200 bored smr 1 349819 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 14461 (syz-executor.1) thread 0xffff800020b28020 (481800) exclusive rrwlock inode r = 0 (0xfffffd80698a9d68) #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9462 6321K 6321K 78643K 10824 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 105 3K 3K 78643K 2668 0 0 ifaddr 35 10K 10K 78643K 376 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 157 0 0 iov 0 0K 24K 78643K 266 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 2621 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 36 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 299 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 7 21K 33K 78643K 3194 0 0 sigio 0 0K 0K 78643K 31 0 0 proc 41 38K 70K 78643K 2835 0 0 subproc 34 2K 2K 78643K 969 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 386 0 0 in_multi 33 2K 2K 78643K 725 0 0 ether_multi 1 0K 0K 78643K 26 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 1047 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 96 21K 30K 78643K 11311 0 0 UVM aobj 130 4K 4K 78643K 142 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 198 0 0 NDP 5 0K 0K 78643K 174 0 0 temp 121 2750K 2822K 78643K 16012 0 0 kqueue 0 0K 0K 78643K 30 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 64 117 0 111 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 255 0 253 1 0 1 1 0 8 0 rtentry 112 651 0 607 2 0 2 2 0 8 0 unpcb 120 1128 0 1120 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 4684 0 4684 1 1 0 1 0 8 0 tcpcb 544 722 0 717 1 0 1 1 0 8 0 inpcb 280 1762 0 1755 2 1 1 2 0 8 0 nd6 48 171 0 165 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2689 0 2498 14 2 12 13 0 8 0 art_table 32 2690 0 2498 2 0 2 2 0 8 0 art_node 16 650 0 610 1 0 1 1 0 8 0 sysvmsgpl 40 30 0 16 1 0 1 1 0 8 0 semapl 112 297 0 287 1 0 1 1 0 8 0 shmpl 112 140 0 12 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 4701 0 3273 47 0 47 47 0 8 0 ffsino 272 4701 0 3273 96 0 96 96 0 8 0 nchpl 144 8549 0 6920 61 0 61 61 0 8 0 uvmvnodes 72 5679 0 0 104 0 104 104 0 8 0 vnodes 200 5679 0 0 299 0 299 299 0 8 0 namei 1024 33459 0 33459 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 25562 0 25562 24 23 1 6 0 8 1 plimitpl 152 538 0 529 1 0 1 1 0 8 0 sigapl 432 3200 0 3185 8 6 2 3 0 8 0 futexpl 56 27352 0 27352 1 0 1 1 0 8 1 knotepl 112 1714 0 1695 1 0 1 1 0 8 0 kqueuepl 104 637 0 635 1 0 1 1 0 8 0 pipepl 112 2234 0 2215 6 5 1 2 0 8 0 fdescpl 488 3201 0 3185 3 0 3 3 0 8 0 filepl 152 19132 0 19029 13 8 5 7 0 8 0 lockfpl 104 654 0 654 9 8 1 1 0 8 1 lockfspl 48 217 0 217 9 8 1 1 0 8 1 sessionpl 112 72 0 62 1 0 1 1 0 8 0 pgrppl 48 113 0 103 1 0 1 1 0 8 0 ucredpl 96 5284 0 5275 1 0 1 1 0 8 0 zombiepl 144 3186 0 3184 2 1 1 1 0 8 0 processpl 896 3217 0 3184 4 0 4 4 0 8 0 procpl 632 8286 0 8243 18 13 5 5 0 8 0 srpgc 64 110 0 110 13 13 0 1 0 8 0 sosppl 128 46 0 46 12 12 0 1 0 8 0 sockpl 384 3207 0 3190 7 4 3 4 0 8 1 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 10 0 0 1 0 1 1 0 8 0 mcl9k 9216 14 0 0 1 0 1 1 0 8 0 mcl8k 8192 9 0 0 2 0 2 2 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 123 0 0 14 0 14 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 348 0 0 12 0 12 12 0 8 0 bufpl 256 12073 0 5049 440 0 440 440 0 8 0 anonpl 16 377208 0 370115 104 58 46 46 0 125 6 amapchunkpl 152 25099 0 25010 35 27 8 9 0 158 2 amappl16 192 15355 0 14974 111 83 28 32 0 8 5 amappl15 184 429 0 427 4 3 1 1 0 8 0 amappl14 176 891 0 882 1 0 1 1 0 8 0 amappl13 168 678 0 677 1 0 1 1 0 8 0 amappl12 160 198 0 198 9 9 0 1 0 8 0 amappl11 152 594 0 582 1 0 1 1 0 8 0 amappl10 144 510 0 505 1 0 1 1 0 8 0 amappl9 136 1625 0 1622 1 0 1 1 0 8 0 amappl8 128 1024 0 996 2 1 1 2 0 8 0 amappl7 120 542 0 532 1 0 1 1 0 8 0 amappl6 112 445 0 436 1 0 1 1 0 8 0 amappl5 104 708 0 698 1 0 1 1 0 8 0 amappl4 96 3534 0 3504 1 0 1 1 0 8 0 amappl3 88 815 0 803 1 0 1 1 0 8 0 amappl2 80 20717 0 20650 3 1 2 3 0 8 0 amappl1 72 94131 0 93683 23 13 10 19 0 8 0 amappl 80 9391 0 9354 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 64 141 0 12 3 0 3 3 0 8 0 uaddrrnd 24 3201 0 3185 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3201 0 3185 1 0 1 1 0 8 0 vmmpekpl 168 29401 0 29371 2 0 2 2 0 8 0 vmmpepl 168 414607 0 413015 146 63 83 85 0 357 2 vmsppl 368 3200 0 3185 2 0 2 2 0 8 0 pdppl 4096 6410 0 6370 6 0 6 6 0 8 0 pvpl 32 994829 0 984516 233 111 122 125 0 265 23 pmappl 232 3200 0 3185 8 7 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 600 0 5 18 0 18 18 0 8 0