witness: lock order reversal: 1st 0xffffffff82cc8bd0 &sched_lock (&sched_lock) 2nd 0xffff8000ffff8118 &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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(ffff8000ffff8118,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff8000ffff8118,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff8000ffff8108) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff80002121bd58,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff80002121bd58,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff80002121bd58,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff80002121bd58,6,ffff800026781978) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff80002121bd58) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff800026781ab0) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff800026781ab0) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f8a3e08d70, count: -9 ddb{0}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be63 rbp 0xffff800026781680 rbx 0x3 rdx 0xffff800000d2a640 rcx 0xffff80002121bd58 rax 0x3ffff acpi_pdirpa+0x2be62 r8 0xffff8000267815f0 r9 0x8080808080808080 r10 0xb0767ccef2282c15 r11 0x33fa18db65bcf30a r12 0xfffffd8003a0a640 r13 0 r14 0xfffffd80039f9ce0 r15 0xfffffd80031c7bc0 rip 0xffffffff81b6e27c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800026781670 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.4) pid=70103 stat=onproc flags process=500010 proc=4002000 pri=32, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff80002121b808,0xffff8000212bf008 process=0xffff8000ffff8008 user=0xffff80002677c000, vmspace=0xfffffd8069b751f0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 54734 396413 48177 32767 2 0x10 syz-executor.0 13169 8140 93596 32767 4 0x582010 syz-executor.4 *13169 70103 93596 32767 7 0x4502010 syz-executor.4 41503 347052 24441 32767 3 0x90 nanoslp syz-executor.3 41503 309685 24441 32767 3 0x4000090 ttyin syz-executor.3 41503 454129 24441 32767 3 0x4000090 fsleep syz-executor.3 41503 394327 24441 32767 3 0x4000090 fsleep syz-executor.3 93596 247085 57811 32767 3 0x90 nanoslp syz-executor.4 57811 129209 1808 0 3 0x82 wait syz-executor.4 48177 262335 11942 32767 3 0x90 nanoslp syz-executor.0 11942 480081 1808 0 3 0x82 wait syz-executor.0 57722 491997 16364 32767 3 0x10 biowait syz-executor.2 16364 336384 1808 0 3 0x82 wait syz-executor.2 42796 278858 0 0 3 0x14200 bored sosplice 17033 518908 67327 32767 3 0x10 biowait syz-executor.7 76896 62667 65415 32767 3 0x90 nanoslp syz-executor.5 67327 477014 1808 0 3 0x82 wait syz-executor.7 72692 133195 40952 32767 7 0x10 syz-executor.6 24441 119353 63228 32767 3 0x90 nanoslp syz-executor.3 40952 391213 1808 0 3 0x82 wait syz-executor.6 65415 171362 1808 0 3 0x82 wait syz-executor.5 63228 436665 1808 0 3 0x82 wait syz-executor.3 89861 83168 17237 32767 2 0x10 syz-executor.1 17237 172943 1808 0 3 0x82 wait syz-executor.1 1808 513376 54985 0 3 0x2000082 wait syz-fuzzer 1808 802 54985 0 3 0x6000082 nanoslp syz-fuzzer 1808 400485 54985 0 3 0x6000082 kqread syz-fuzzer 1808 391424 54985 0 3 0x6000082 wait syz-fuzzer 1808 87671 54985 0 3 0x6000082 thrsleep syz-fuzzer 1808 308518 54985 0 3 0x6000082 thrsleep syz-fuzzer 1808 134952 54985 0 3 0x6000082 wait syz-fuzzer 1808 247942 54985 0 3 0x6000082 wait syz-fuzzer 1808 77321 54985 0 3 0x6000082 thrsleep syz-fuzzer 1808 5625 54985 0 3 0x6000082 thrsleep syz-fuzzer 1808 276210 54985 0 3 0x6000082 wait syz-fuzzer 1808 515949 54985 0 3 0x6000082 wait syz-fuzzer 1808 204326 54985 0 3 0x6000082 thrsleep syz-fuzzer 1808 322128 54985 0 3 0x6000082 wait syz-fuzzer 1808 520341 54985 0 3 0x6000082 wait syz-fuzzer 1808 70914 54985 0 3 0x6000082 thrsleep syz-fuzzer 54985 96230 80479 0 3 0x10008a sigsusp ksh 80479 45197 71080 0 3 0x9a kqread sshd 99761 111986 1 0 3 0x100083 ttyin getty 71080 18363 1 0 3 0x88 kqread sshd 6452 412271 19820 73 3 0x1100090 kqread syslogd 19820 149768 1 0 3 0x100082 netio syslogd 49705 142 1 0 3 0x100080 kqread resolvd 32464 231163 81433 77 3 0x100092 kqread dhcpleased 83654 312211 81433 77 3 0x100092 kqread dhcpleased 81433 457880 1 0 3 0x80 kqread dhcpleased 31313 321731 0 0 3 0x14200 bored smr 54627 128788 0 0 2 0x14200 zerothread 67625 462987 0 0 3 0x14200 aiodoned aiodoned 47149 218066 0 0 3 0x14200 syncer update 5573 343706 0 0 3 0x14200 cleaner cleaner 95533 149623 0 0 3 0x14200 reaper reaper 6082 248968 0 0 3 0x14200 pgdaemon pagedaemon 61420 283987 0 0 3 0x14200 bored viomb 67273 444821 0 0 3 0x40014200 acpi0 acpi0 84165 312388 0 0 3 0x40014200 idle1 33450 414371 0 0 3 0x14200 bored softnet3 54595 270395 0 0 3 0x14200 bored softnet2 19189 445617 0 0 3 0x14200 bored softnet1 8413 307238 0 0 3 0x14200 bored softnet0 64957 175391 0 0 3 0x14200 bored systqmp 68671 221071 0 0 3 0x14200 bored systq 7991 135707 0 0 3 0x40014200 bored softclock 31115 273388 0 0 3 0x40014200 idle0 1 377532 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive sched_lock &sched_lock r = 0 (0xffffffff82cc8bd0) #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 13169 (syz-executor.4) thread 0xffff80002121bd58 (70103) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82ca0228) #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 (0xffffffff82cc8bd0) #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 57722 (syz-executor.2) thread 0xffff800021224550 (491997) exclusive rrwlock inode r = 0 (0xfffffd8067d21918) #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 vget+0x200 sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1314 #8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6e2 sys/kern/vfs_lookup.c:566 #11 namei+0x55a sys/kern/vfs_lookup.c:250 #12 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847 #13 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #13 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8067d21c48) #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 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847 #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 Process 17033 (syz-executor.7) thread 0xffff800021224000 (518908) exclusive rrwlock inode r = 0 (0xfffffd8067d21098) #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 vget+0x200 sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1314 #8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6e2 sys/kern/vfs_lookup.c:566 #11 namei+0x55a sys/kern/vfs_lookup.c:250 #12 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847 #13 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #13 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8067bd5818) #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 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847 #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10188 6408K 6420K 78643K 11284 0 pcb 13 10K 12K 78643K 15 0 rtable 244 6K 7K 78643K 670 0 pf 29 8K 8K 78643K 41 0 ifaddr 44 15K 15K 78643K 72 0 ifgroup 50 2K 2K 78643K 74 0 sysctl 2 0K 0K 78643K 2 0 counters 60 35K 35K 78643K 72 0 ioctlops 0 0K 2K 78643K 84 0 iov 0 0K 24K 78643K 260 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1279 80K 80K 78643K 1883 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 71 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 554 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 21 77K 121K 78643K 3707 0 sigio 0 0K 0K 78643K 18 0 proc 56 78K 115K 78643K 818 0 subproc 104 6K 6K 78643K 182 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 263 0 in_multi 99 7K 7K 78643K 195 0 ether_multi 1 0K 0K 78643K 5 0 mrt 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 940 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 368 89K 103K 78643K 38567 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 141 0 NDP 11 0K 2K 78643K 45 0 temp 74 5920K 5986K 78643K 12699 0 kqueue 13 20K 31K 78643K 3104 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> 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 120 270 0 267 5 4 1 3 0 8 0 rtentry 112 190 0 75 4 0 4 4 0 8 0 unpcb 144 1792 0 1779 20 14 6 6 0 8 5 syncache 304 38 0 38 8 7 1 1 0 8 1 tcpqe 32 179 0 179 5 4 1 1 0 8 1 tcpcb 808 1766 0 1736 41 31 10 13 0 8 6 arp 120 31 0 13 1 0 1 1 0 8 0 ipq 40 8 0 8 1 1 0 1 0 8 0 ipqe 40 20 0 20 1 1 0 1 0 8 0 inpcb 368 2563 0 2530 43 34 9 12 0 8 5 nd6 136 54 0 25 5 4 1 2 0 8 0 kcovpl 48 14 0 6 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 780 0 303 32 2 30 31 0 8 0 art_table 32 781 0 303 4 0 4 4 0 8 0 art_node 16 189 0 84 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 4 1 1 0 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 550 0 540 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 6038 0 4597 91 0 91 91 0 8 0 ffsino 272 6038 0 4597 97 0 97 97 0 8 0 nchpl 144 11662 0 10019 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 38681 0 38681 4 3 1 2 0 8 1 percpumem 16 49 0 6 1 0 1 1 0 8 0 kstatmem 264 34 0 12 2 0 2 2 0 8 0 scxspl 216 31026 0 31024 14 13 1 8 1 8 0 plimitpl 152 684 0 660 7 5 2 2 0 8 1 sigapl 424 3990 0 3939 7 0 7 7 0 8 0 futexpl 64 30518 0 30516 3 2 1 1 0 8 0 knotepl 120 473 0 0 10 0 10 10 0 8 0 kqueuepl 216 4886 0 4877 43 38 5 10 0 8 4 pipepl 320 972 0 944 21 18 3 8 0 8 0 fdescpl 496 3972 0 3940 7 2 5 6 0 8 0 filepl 152 28247 0 28008 51 35 16 19 0 8 6 lockfpl 104 513 0 511 1 0 1 1 0 8 0 lockfspl 48 127 0 125 1 0 1 1 0 8 0 sessionpl 144 29 0 13 1 0 1 1 0 8 0 pgrppl 48 145 0 129 1 0 1 1 0 8 0 ucredpl 104 3159 0 3141 1 0 1 1 0 8 0 zombiepl 144 3940 0 3939 1 0 1 1 0 8 0 processpl 1072 3990 0 3939 5 0 5 5 0 8 0 procpl 680 10375 0 10305 14 7 7 8 0 8 0 sosppl 168 75 0 72 5 4 1 1 0 8 0 sockpl 488 5603 0 5554 91 68 23 23 0 8 16 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 8 0 0 1 0 1 1 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 7 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 25 0 0 3 0 3 3 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 285 0 0 31 0 31 31 0 8 0 mtagpl 96 9 0 0 1 0 1 1 0 8 0 mbufpl 256 1135 0 0 59 0 59 59 0 8 0 bufpl 288 8643 0 2317 453 0 453 453 0 8 0 anonpl 24 523045 0 512033 141 59 82 97 0 186 0 amapchunkpl 152 123710 0 122863 71 32 39 48 0 158 0 amappl16 200 12285 0 11987 74 57 17 29 0 8 1 amappl15 192 9 0 9 1 1 0 1 0 8 0 amappl14 184 174 0 160 2 1 1 2 0 8 0 amappl13 176 14 0 14 2 2 0 1 0 8 0 amappl12 168 4695 0 4662 2 0 2 2 0 8 0 amappl11 160 50 0 39 1 0 1 1 0 8 0 amappl10 152 49 0 37 1 0 1 1 0 8 0 amappl9 144 225 0 221 1 0 1 1 0 8 0 amappl8 136 292 0 205 4 0 4 4 0 8 0 amappl7 128 76 0 63 1 0 1 1 0 8 0 amappl6 120 304 0 282 2 1 1 2 0 8 0 amappl5 112 281 0 272 1 0 1 1 0 8 0 amappl4 104 657 0 616 3 0 3 3 0 8 0 amappl3 96 24267 0 24184 3 0 3 3 0 8 0 amappl2 88 4384 0 4314 3 1 2 3 0 8 0 amappl1 80 22488 0 21974 22 9 13 22 0 8 0 amappl 88 37908 0 37671 8 1 7 7 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 3972 0 3940 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3972 0 3940 1 0 1 1 0 8 0 vmmpekpl 168 33464 0 33392 4 0 4 4 0 8 0 vmmpepl 168 250519 0 248277 166 56 110 121 0 357 3 vmsppl 464 3971 0 3940 7 2 5 6 0 8 0 rwobjpl 56 73895 0 66516 109 4 105 105 0 8 0 pdppl 4096 7952 0 7880 244 162 82 94 0 8 10 pvpl 32 1306924 0 1290042 390 228 162 362 0 265 8 pmappl 248 3971 0 3940 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1126 0 241 26 0 26 26 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(ffff8000ffff8118,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff8000ffff8118,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff8000ffff8108) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff80002121bd58,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff80002121bd58,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff80002121bd58,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff80002121bd58,6,ffff800026781978) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff80002121bd58) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff800026781ab0) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff800026781ab0) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f8a3e08d70, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020d58ff0) 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 syscall(ffff8000271b3500) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000271b3500) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71a015da3860, count: -6