witness: lock order reversal: 1st 0xffffffff82d0ad08 &sched_lock (&sched_lock) 2nd 0xffff8000ffff6f38 &pr->ps_mtx (&pr->ps_mtx) lock order "&pr->ps_mtx"(mutex) -> "&sched_lock"(sched_lock) first seen at: #0 __mp_lock+0xa2 read_rflags machine/cpufunc.h:195 [inline] #0 __mp_lock+0xa2 intr_disable machine/cpufunc.h:216 [inline] #0 __mp_lock+0xa2 sys/kern/kern_lock.c:142 #1 donice+0x178 sys/kern/kern_resource.c:218 #2 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #2 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #3 Xsyscall+0x128 lock order "&sched_lock"(sched_lock) -> "&pr->ps_mtx"(mutex) first seen at: #0 mtx_enter+0x3e sys/kern/kern_lock.c:265 #1 single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] #1 single_thread_set+0x35a sys/kern/kern_sig.c:2155 #2 sigexit+0x90 sys/kern/kern_sig.c:1562 #3 postsig+0x4a9 sys/kern/kern_sig.c:1494 #4 userret+0x16e sys/kern/kern_sig.c:1987 #5 syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] #5 syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 #6 Xsyscall+0x128 Stopped at db_enter+0x1c: addq $0x8,%rsp ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(ffff8000ffff6f38,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff8000ffff6f38,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff8000ffff6f28) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff80002129c000,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff80002129c000,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff80002129c000,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff80002129c000,6,ffff800027b91218) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff80002129c000) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff800027b91350) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff800027b91350) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb46956c2890, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be63 rbp 0xffff800027b90f20 rbx 0x3 rdx 0xffff800000d022c0 rcx 0xffff80002129c000 rax 0x3ffff acpi_pdirpa+0x2be62 r8 0xffff800027b90e90 r9 0x8080808080808080 r10 0xb1d6889be3e413ad r11 0xf8773064d7238409 r12 0xfffffd8003a0a850 r13 0 r14 0xfffffd80039fdc20 r15 0xfffffd80031c7bc0 rip 0xffffffff81334fdc db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800027b90f10 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.4) pid=22544 stat=onproc flags process=500010 proc=4002000 pri=32, usrpri=77, nice=20 forw=0xffffffffffffffff, list=0xffff80002129caa0,0xffffffff82c89948 process=0xffff8000ffff6e28 user=0xffff800027b8c000, vmspace=0xfffffd806b61f768 estcpu=27, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 83178 276267 54668 32767 2 0x10 syz-executor.1 83178 462533 54668 32767 3 0x4000090 fsleep syz-executor.1 79692 365375 40707 32767 7 0x10 syz-executor.5 29891 169336 41454 32767 2 0x10 syz-executor.0 29891 359781 41454 32767 3 0x4000090 nanoslp syz-executor.0 86177 127109 26615 32767 2 0x10 syz-executor.7 86177 414459 26615 32767 3 0x4000090 fsleep syz-executor.7 53477 377060 9281 32767 4 0x582010 syz-executor.4 *53477 22544 9281 32767 7 0x4502010 syz-executor.4 16955 144695 58404 32767 2 0x10 syz-executor.2 16955 518635 58404 32767 3 0x4000090 fsleep syz-executor.2 41342 309875 54916 32767 2 0x10 syz-executor.3 41342 185006 54916 32767 3 0x4000010 biowait syz-executor.3 51753 171113 0 0 3 0x14200 bored sosplice 26615 491497 92090 32767 3 0x90 nanoslp syz-executor.7 54916 334743 44646 32767 3 0x90 nanoslp syz-executor.3 40707 202734 18332 32767 3 0x90 nanoslp syz-executor.5 44646 202814 36310 0 3 0x82 wait syz-executor.3 92090 62241 36310 0 3 0x82 wait syz-executor.7 14394 481662 54978 32767 2 0x10 syz-executor.6 58404 343602 55636 32767 3 0x90 nanoslp syz-executor.2 54668 447363 15782 32767 3 0x90 nanoslp syz-executor.1 9281 297313 53473 32767 3 0x90 nanoslp syz-executor.4 18332 20570 36310 0 3 0x82 wait syz-executor.5 53473 197633 36310 0 3 0x82 wait syz-executor.4 54978 517015 36310 0 3 0x82 wait syz-executor.6 55636 473360 36310 0 3 0x82 wait syz-executor.2 41454 404727 34118 32767 3 0x90 nanoslp syz-executor.0 15782 288225 36310 0 3 0x82 wait syz-executor.1 34118 32709 36310 0 3 0x82 wait syz-executor.0 36310 354410 85248 0 3 0x2000082 wait syz-fuzzer 36310 452509 85248 0 3 0x6000082 nanoslp syz-fuzzer 36310 112157 85248 0 3 0x6000082 wait syz-fuzzer 36310 184994 85248 0 3 0x6000082 thrsleep syz-fuzzer 36310 212632 85248 0 3 0x6000082 wait syz-fuzzer 36310 139024 85248 0 3 0x6000082 wait syz-fuzzer 36310 266123 85248 0 3 0x6000082 wait syz-fuzzer 36310 524085 85248 0 3 0x6000082 thrsleep syz-fuzzer 36310 405907 85248 0 3 0x6000082 wait syz-fuzzer 36310 460257 85248 0 3 0x6000082 wait syz-fuzzer 36310 301691 85248 0 3 0x6000082 thrsleep syz-fuzzer 36310 168992 85248 0 3 0x6000082 wait syz-fuzzer 36310 491445 85248 0 3 0x6000082 kqread syz-fuzzer 36310 16702 85248 0 3 0x6000082 thrsleep syz-fuzzer 36310 100299 85248 0 3 0x6000082 thrsleep syz-fuzzer 85248 57808 39243 0 3 0x10008a sigsusp ksh 39243 514221 16093 0 3 0x9a kqread sshd 70917 495384 1 0 3 0x100083 ttyin getty 16093 431390 1 0 3 0x88 kqread sshd 20589 342335 66470 73 3 0x1100090 kqread syslogd 66470 188074 1 0 3 0x100082 netio syslogd 14010 523805 1 0 3 0x100080 kqread resolvd 91493 51250 44335 77 3 0x100092 kqread dhcpleased 77375 52022 44335 77 3 0x100092 kqread dhcpleased 44335 230070 1 0 3 0x80 kqread dhcpleased 55942 337604 0 0 3 0x14200 bored smr 16386 37758 0 0 2 0x14200 zerothread 69998 31736 0 0 3 0x14200 aiodoned aiodoned 43700 44478 0 0 3 0x14200 syncer update 57516 69944 0 0 3 0x14200 cleaner cleaner 76571 226745 0 0 3 0x14200 reaper reaper 27566 472011 0 0 3 0x14200 pgdaemon pagedaemon 34771 190211 0 0 3 0x14200 bored viomb 41253 54998 0 0 3 0x40014200 acpi0 acpi0 94067 500814 0 0 3 0x40014200 idle1 67645 30358 0 0 3 0x14200 bored softnet3 74518 344784 0 0 3 0x14200 bored softnet2 11636 66732 0 0 3 0x14200 bored softnet1 46522 7421 0 0 3 0x14200 bored softnet0 37047 321258 0 0 3 0x14200 bored systqmp 45223 64275 0 0 3 0x14200 bored systq 26125 426173 0 0 3 0x40014200 bored softclock 142 315652 0 0 3 0x40014200 idle0 1 55208 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive sched_lock &sched_lock r = 0 (0xffffffff82d0ad08) #0 witness_lock+0x447 #1 single_thread_set+0x179 sys/kern/kern_sig.c:2113 #2 sigexit+0x90 sys/kern/kern_sig.c:1562 #3 postsig+0x4a9 sys/kern/kern_sig.c:1494 #4 userret+0x16e sys/kern/kern_sig.c:1987 #5 syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] #5 syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 #6 Xsyscall+0x128 Process 53477 (syz-executor.4) thread 0xffff80002129c000 (22544) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82c795f0) #0 witness_lock+0x447 #1 postsig+0x49e sys/kern/kern_sig.c:1500 #2 userret+0x16e sys/kern/kern_sig.c:1987 #3 syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] #3 syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 #4 Xsyscall+0x128 exclusive sched_lock &sched_lock r = 0 (0xffffffff82d0ad08) #0 witness_lock+0x447 #1 single_thread_set+0x179 sys/kern/kern_sig.c:2113 #2 sigexit+0x90 sys/kern/kern_sig.c:1562 #3 postsig+0x4a9 sys/kern/kern_sig.c:1494 #4 userret+0x16e sys/kern/kern_sig.c:1987 #5 syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] #5 syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 #6 Xsyscall+0x128 Process 41342 (syz-executor.3) thread 0xffff80002129c7f8 (185006) exclusive rrwlock inode r = 0 (0xfffffd8073a7be68) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 ufs_rename+0x18b sys/ufs/ufs/ufs_vnops.c:791 #6 VOP_RENAME+0xf4 sys/kern/vfs_vops.c:370 #7 dorenameat+0x2a0 sys/kern/vfs_syscalls.c:2994 #8 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #8 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #9 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8073a7b2b8) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0xd5 sys/kern/vfs_lookup.c:418 #6 namei+0x55a sys/kern/vfs_lookup.c:250 #7 dorenameat+0x104 sys/kern/vfs_syscalls.c:2964 #8 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #8 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10188 6408K 6420K 78643K 11266 0 pcb 13 8K 8K 78643K 13 0 rtable 236 6K 7K 78643K 367 0 pf 29 8K 8K 78643K 29 0 ifaddr 44 15K 15K 78643K 46 0 ifgroup 50 2K 2K 78643K 50 0 counters 60 35K 35K 78643K 60 0 ioctlops 0 0K 2K 78643K 37 0 iov 0 0K 16K 78643K 37 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1278 80K 80K 78643K 1520 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 41 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 95 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 25 93K 125K 78643K 1093 0 sigio 0 0K 0K 78643K 43 0 proc 56 78K 115K 78643K 506 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 31 0 in_multi 99 7K 7K 78643K 108 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 67 307K 307K 78643K 67 0 exec 0 0K 1K 78643K 396 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 349 82K 91K 78643K 12579 0 UVM aobj 35 2K 2K 78643K 35 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 24 0 NDP 11 0K 2K 78643K 27 0 temp 74 5916K 5980K 78643K 6191 0 kqueue 12 18K 34K 78643K 101 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 257 0 254 1 0 1 1 0 8 0 rtentry 112 114 0 3 4 0 4 4 0 8 0 unpcb 144 532 0 516 5 1 4 4 0 8 3 syncache 304 12 0 12 2 2 0 1 0 8 0 tcpqe 32 173 0 173 2 2 0 1 0 8 0 tcpcb 808 321 0 313 11 3 8 8 0 8 6 arp 120 18 0 0 1 0 1 1 0 8 0 ipq 40 2 0 0 1 0 1 1 0 8 0 ipqe 40 7 0 3 1 0 1 1 0 8 0 inpcb 368 1330 0 1318 10 2 8 9 0 8 5 nd6 136 27 0 2 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 464 0 4 29 0 29 29 0 8 0 art_table 32 465 0 4 4 0 4 4 0 8 0 art_node 16 113 0 12 1 0 1 1 0 8 0 sysvmsgpl 40 46 0 42 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 93 0 83 1 0 1 1 0 8 0 shmpl 112 32 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2772 0 1334 91 0 91 91 0 8 0 ffsino 272 2772 0 1334 97 0 97 97 0 8 0 nchpl 144 4303 0 2625 63 0 63 63 0 8 0 uvmvnodes 80 2885 0 0 59 0 59 59 0 8 0 vnodes 216 2885 0 0 161 0 161 161 0 8 0 namei 1024 15086 0 15084 2 1 1 2 0 8 0 percpumem 16 43 0 0 1 0 1 1 0 8 0 kstatmem 264 22 0 0 2 0 2 2 0 8 0 scxspl 216 13200 0 13199 12 9 3 8 1 8 2 plimitpl 152 241 0 218 2 1 1 2 0 8 0 sigapl 424 1390 0 1336 7 0 7 7 0 8 0 futexpl 64 6806 0 6803 1 0 1 1 0 8 0 knotepl 120 115 0 0 4 0 4 4 0 8 0 kqueuepl 216 291 0 283 9 4 5 5 0 8 4 pipepl 320 275 0 247 8 5 3 8 0 8 0 fdescpl 496 1372 0 1336 7 2 5 6 0 8 0 filepl 152 9015 0 8778 20 5 15 17 0 8 5 lockfpl 104 142 0 140 1 0 1 1 0 8 0 lockfspl 48 55 0 53 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 27 0 11 1 0 1 1 0 8 0 ucredpl 104 1299 0 1281 1 0 1 1 0 8 0 zombiepl 144 1336 0 1336 1 0 1 1 0 8 1 processpl 1072 1390 0 1336 5 1 4 5 0 8 0 procpl 680 2986 0 2912 8 0 8 8 0 8 1 sosppl 168 18 0 18 1 1 0 1 0 8 0 sockpl 488 2156 0 2125 19 6 13 14 0 8 9 mcl64k 65536 10 0 0 2 0 2 2 0 8 0 mcl16k 16384 9 0 0 2 0 2 2 0 8 0 mcl12k 12288 7 0 0 1 0 1 1 0 8 0 mcl9k 9216 5 0 0 1 0 1 1 0 8 0 mcl8k 8192 10 0 0 2 0 2 2 0 8 0 mcl4k 4096 18 0 0 3 0 3 3 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 256 0 0 32 0 32 32 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 983 0 0 60 0 60 60 0 8 0 bufpl 288 5542 0 143 386 0 386 386 0 8 0 anonpl 24 291084 0 280129 92 14 78 89 0 186 3 amapchunkpl 152 40973 0 40061 47 7 40 44 0 158 4 amappl16 200 7444 0 7174 27 11 16 26 0 8 0 amappl15 192 11 0 11 1 1 0 1 0 8 0 amappl14 184 149 0 135 2 1 1 2 0 8 0 amappl13 176 10 0 10 1 1 0 1 0 8 0 amappl12 168 2018 0 1981 2 0 2 2 0 8 0 amappl11 160 51 0 40 1 0 1 1 0 8 0 amappl10 152 27 0 18 1 0 1 1 0 8 0 amappl9 144 207 0 204 1 0 1 1 0 8 0 amappl8 136 184 0 130 2 0 2 2 0 8 0 amappl7 128 67 0 57 2 0 2 2 0 8 0 amappl6 120 235 0 218 2 1 1 2 0 8 0 amappl5 112 194 0 184 1 0 1 1 0 8 0 amappl4 104 562 0 525 3 1 2 3 0 8 0 amappl3 96 8373 0 8272 4 1 3 4 0 8 0 amappl2 88 1656 0 1580 3 1 2 3 0 8 0 amappl1 80 13018 0 12481 22 9 13 22 0 8 0 amappl 88 12038 0 11786 8 1 7 8 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 34 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1372 0 1336 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1372 0 1336 1 0 1 1 0 8 0 vmmpekpl 168 15680 0 15626 3 0 3 3 0 8 0 vmmpepl 168 100274 0 97920 125 18 107 123 0 357 4 vmsppl 464 1371 0 1336 7 2 5 6 0 8 0 rwobjpl 56 34642 0 30442 61 1 60 60 0 8 0 pdppl 4096 2752 0 2672 132 50 82 96 0 8 2 pvpl 32 652019 0 634821 364 52 312 362 0 265 169 pmappl 248 1371 0 1336 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 874 0 58 24 0 24 24 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82c29ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 sys/dev/kcov.c:158 __mp_lock(ffffffff82c793e8) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c793e8) at __mp_lock+0x133 sys/kern/kern_lock.c:147 intr_handler(ffff80002afed1a0,ffff800000069c00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x29 sys/dev/kcov.c:158 __mp_lock(ffffffff82c793e8) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c793e8) at __mp_lock+0x133 sys/kern/kern_lock.c:147 intr_handler(ffff80002afed300,ffff80000006bc00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff82c793e8) at __mp_lock+0x12e __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c793e8) at __mp_lock+0x12e sys/kern/kern_lock.c:147 syscall(ffff80002afed4d0) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002afed4d0) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7edebcaf9810, count: -14 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x1c: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(ffff8000ffff6f38,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff8000ffff6f38,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff8000ffff6f28) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff80002129c000,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff80002129c000,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff80002129c000,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff80002129c000,6,ffff800027b91218) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff80002129c000) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff800027b91350) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff800027b91350) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb46956c2890, count: -9