witness: lock order reversal: 1st 0xffffffff82c65f30 &sched_lock (&sched_lock) 2nd 0xffff80002121de70 &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(ffff80002121de70,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff80002121de70,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff80002121de60) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff80002129da98,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff80002129da98,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff80002129da98,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff80002129da98,6,ffff800024781bc8) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff80002129da98) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff800024781d00) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff800024781d00) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x234db877960, count: -9 ddb{1}> show registers rdi 0x3 rsi 0xffffffff82befdd0 __sancov_gen_cov_switch_values.134 rbp 0xffff8000247818d0 rbx 0x3 rdx 0 rcx 0xffff80002129da98 rax 0xffff800020d58ff0 r8 0xffff800024781840 r9 0x8080808080808080 r10 0x99e8b32b3455520b r11 0x635edd2e73e87e21 r12 0xfffffd8003a0d6f0 r13 0 r14 0xfffffd80039f8560 r15 0xfffffd80031cabc0 rip 0xffffffff8165630c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff8000247818c0 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.2) pid=182774 stat=onproc flags process=500010 proc=4002000 pri=32, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff80002129c558,0xffff80002129c810 process=0xffff80002121dd60 user=0xffff80002477c000, vmspace=0xfffffd806ba8ecc8 estcpu=30, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 47736 303994 33775 32767 2 0x10 syz-executor.7 17659 34052 14075 32767 2 0x10 syz-executor.5 12848 59795 58288 32767 2 0x10 syz-executor.0 12848 250893 58288 32767 3 0x4000090 fsleep syz-executor.0 12848 84128 58288 32767 7 0x4000010 syz-executor.0 64987 481692 24214 32767 2 0x10 syz-executor.4 64987 467155 24214 32767 3 0x4000090 pipewr syz-executor.4 64987 340443 24214 32767 3 0x4000090 pipewr syz-executor.4 86124 190968 13241 32767 4 0x582010 syz-executor.2 *86124 182774 13241 32767 7 0x4502010 syz-executor.2 86124 319298 13241 32767 4 0x4580090 fsleep syz-executor.2 50444 346257 15178 32767 2 0x10 syz-executor.3 50444 392932 15178 32767 3 0x4000090 fsleep syz-executor.3 50444 319532 15178 32767 3 0x4000090 fsleep syz-executor.3 14075 377893 14158 32767 3 0x90 nanoslp syz-executor.5 14158 315181 51759 0 3 0x82 wait syz-executor.5 24214 177282 25170 32767 3 0x90 nanoslp syz-executor.4 25170 490339 51759 0 3 0x82 wait syz-executor.4 33775 63294 34263 32767 3 0x90 nanoslp syz-executor.7 34263 251370 51759 0 3 0x82 wait syz-executor.7 13241 10245 33430 32767 3 0x90 nanoslp syz-executor.2 33430 205031 51759 0 3 0x82 wait syz-executor.2 34919 122602 60861 32767 3 0x10 biowait syz-executor.1 60861 191631 51759 0 3 0x82 wait syz-executor.1 15178 475438 46950 32767 3 0x90 nanoslp syz-executor.3 46950 127869 51759 0 3 0x82 wait syz-executor.3 55671 279210 0 0 3 0x14200 bored sosplice 93073 217008 62456 32767 3 0x10 biowait syz-executor.6 62456 29396 51759 0 3 0x82 wait syz-executor.6 58288 232286 55767 32767 3 0x90 nanoslp syz-executor.0 55767 89238 51759 0 3 0x82 wait syz-executor.0 51759 386205 95243 0 3 0x2000082 wait syz-fuzzer 51759 291696 95243 0 3 0x6000082 nanoslp syz-fuzzer 51759 279968 95243 0 3 0x6000082 wait syz-fuzzer 51759 261907 95243 0 3 0x6000082 wait syz-fuzzer 51759 471774 95243 0 3 0x6000082 thrsleep syz-fuzzer 51759 344569 95243 0 3 0x6000082 thrsleep syz-fuzzer 51759 479877 95243 0 3 0x6000082 wait syz-fuzzer 51759 88274 95243 0 3 0x6000082 thrsleep syz-fuzzer 51759 515660 95243 0 3 0x6000082 wait syz-fuzzer 51759 1284 95243 0 3 0x6000082 thrsleep syz-fuzzer 51759 224153 95243 0 3 0x6000082 thrsleep syz-fuzzer 51759 350457 95243 0 3 0x6000082 wait syz-fuzzer 51759 71800 95243 0 3 0x6000082 thrsleep syz-fuzzer 51759 350720 95243 0 3 0x6000082 wait syz-fuzzer 51759 488935 95243 0 3 0x6000082 wait syz-fuzzer 51759 201169 95243 0 3 0x6000082 kqread syz-fuzzer 95243 359522 58931 0 3 0x10008a sigsusp ksh 58931 124784 3492 0 3 0x9a kqread sshd 89867 70528 1 0 3 0x100083 ttyin getty 3492 84777 1 0 3 0x88 kqread sshd 45789 417300 87100 73 3 0x1100090 kqread syslogd 87100 57659 1 0 3 0x100082 netio syslogd 71577 462920 1 0 3 0x100080 kqread resolvd 48715 462923 89169 77 3 0x100092 kqread dhcpleased 29505 187211 89169 77 3 0x100092 kqread dhcpleased 89169 155342 1 0 3 0x80 kqread dhcpleased 70142 125159 0 0 3 0x14200 bored smr 85055 289584 0 0 2 0x14200 zerothread 18800 266506 0 0 3 0x14200 aiodoned aiodoned 92735 309919 0 0 3 0x14200 syncer update 39105 295821 0 0 3 0x14200 cleaner cleaner 98745 42974 0 0 3 0x14200 reaper reaper 39708 495873 0 0 3 0x14200 pgdaemon pagedaemon 3433 442728 0 0 3 0x14200 bored viomb 1075 94970 0 0 3 0x40014200 acpi0 acpi0 22671 365350 0 0 3 0x40014200 idle1 12871 156809 0 0 3 0x14200 bored softnet3 94379 262620 0 0 3 0x14200 bored softnet2 14043 495977 0 0 3 0x14200 bored softnet1 77302 336578 0 0 3 0x14200 bored softnet0 61972 412202 0 0 3 0x14200 bored systqmp 37780 78587 0 0 3 0x14200 bored systq 54331 38451 0 0 3 0x40014200 bored softclock 46341 402617 0 0 3 0x40014200 idle0 1 285563 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 (0xffffffff82c65f30) #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 86124 (syz-executor.2) thread 0xffff80002129da98 (182774) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82d03430) #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 (0xffffffff82c65f30) #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 34919 (syz-executor.1) thread 0xffff800021289540 (122602) exclusive rrwlock inode r = 0 (0xfffffd80606f70a0) #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 ufs_ihashins+0x46 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1343 #6 ffs_inode_alloc+0x1c2 sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf8 sys/ufs/ufs/ufs_vnops.c:1149 #8 VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388 #9 domkdirat+0x125 sys/kern/vfs_syscalls.c:3073 #10 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #10 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80756dfd60) #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 domkdirat+0x79 sys/kern/vfs_syscalls.c:3058 #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 93073 (syz-executor.6) thread 0xffff80002120c568 (217008) exclusive rrwlock inode r = 0 (0xfffffd80606f7d60) #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 ufs_ihashins+0x46 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1343 #6 ffs_inode_alloc+0x1c2 sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf8 sys/ufs/ufs/ufs_vnops.c:1149 #8 VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388 #9 domkdirat+0x125 sys/kern/vfs_syscalls.c:3073 #10 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #10 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80756dff80) #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 domkdirat+0x79 sys/kern/vfs_syscalls.c:3058 #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 10213 6411K 6420K 78643K 11349 0 pcb 13 16K 20K 78643K 19 0 rtable 238 6K 7K 78643K 1392 0 pf 29 8K 8K 78643K 67 0 ifaddr 44 15K 15K 78643K 124 0 ifgroup 50 2K 2K 78643K 126 0 sysctl 3 1K 1K 78643K 3 0 counters 60 35K 35K 78643K 98 0 ioctlops 0 0K 2K 78643K 141 0 iov 0 0K 40K 78643K 2455 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1279 80K 80K 78643K 3783 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 13K 78643K 241 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 250 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 24 89K 113K 78643K 14288 0 sigio 0 0K 0K 78643K 422 0 proc 56 78K 103K 78643K 1964 0 subproc 104 6K 6K 78643K 351 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 703 0 in_multi 99 7K 7K 78643K 447 0 ether_multi 1 0K 0K 78643K 7 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 217 970K 970K 78643K 217 0 exec 0 0K 1K 78643K 3789 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 470 93K 107K 78643K 144180 0 UVM aobj 131 4K 4K 78643K 141 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 288 0 NDP 11 0K 2K 78643K 84 0 temp 74 5920K 6048K 78643K 36950 0 kqueue 12 18K 35K 78643K 1194 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 120 899 0 896 12 11 1 5 0 8 0 rtentry 112 353 0 241 4 0 4 4 0 8 0 unpcb 144 41726 0 41713 184 176 8 11 0 8 7 syncache 304 201 0 201 28 28 0 1 0 8 0 tcpqe 32 591 0 591 26 26 0 1 0 8 0 tcpcb 808 5532 0 5523 127 116 11 16 0 8 8 arp 120 58 0 40 1 0 1 1 0 8 0 ipq 40 20 0 20 8 7 1 1 0 8 1 ipqe 40 73 0 73 8 7 1 1 0 8 1 inpcb 368 9745 0 9734 178 168 10 20 0 8 7 nd6 136 112 0 86 5 4 1 2 0 8 0 kcovpl 48 27 0 19 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1429 0 958 32 2 30 31 0 8 0 art_table 32 1430 0 958 4 0 4 4 0 8 0 art_node 16 352 0 250 1 0 1 1 0 8 0 semupl 112 8 0 8 1 1 0 1 0 8 0 semapl 112 174 0 164 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 dino2pl 256 20474 0 19018 92 0 92 92 0 8 0 ffsino 272 20474 0 19018 98 0 98 98 0 8 0 nchpl 144 40774 0 39132 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 134330 0 134328 11 10 1 2 0 8 0 percpumem 16 62 0 19 1 0 1 1 0 8 0 kstatmem 264 60 0 38 2 0 2 2 0 8 0 scxspl 216 116692 0 116690 33 32 1 8 1 8 0 plimitpl 152 2429 0 2406 25 24 1 2 0 8 0 sigapl 424 14541 0 14488 7 0 7 7 0 8 0 futexpl 64 123741 0 123737 7 6 1 1 0 8 0 knotepl 120 1032 0 0 18 2 16 17 0 8 0 kqueuepl 216 2851 0 2843 57 56 1 8 0 8 0 pipepl 320 4713 0 4684 117 111 6 11 0 8 3 fdescpl 496 14523 0 14488 7 2 5 6 0 8 0 filepl 152 119774 0 119538 232 215 17 24 0 8 7 lockfpl 104 1883 0 1881 2 1 1 2 0 8 0 lockfspl 48 527 0 525 1 0 1 1 0 8 0 sessionpl 144 42 0 26 1 0 1 1 0 8 0 pgrppl 48 2301 0 2285 1 0 1 1 0 8 0 ucredpl 104 12444 0 12426 1 0 1 1 0 8 0 zombiepl 144 14488 0 14488 3 2 1 1 0 8 1 processpl 1072 14541 0 14488 4 0 4 4 0 8 0 procpl 680 40754 0 40678 36 28 8 9 0 8 1 sosppl 168 231 0 231 22 22 0 1 0 8 0 sockpl 488 52962 0 52935 1177 1163 14 47 0 8 8 mcl64k 65536 33 0 0 4 1 3 3 0 8 0 mcl16k 16384 26 0 0 4 1 3 3 0 8 1 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 57 0 0 5 2 3 3 0 8 0 mcl4k 4096 82 0 0 4 0 4 4 0 8 0 mcl2k2 2112 16 0 0 2 0 2 2 0 8 0 mcl2k 2048 438 0 0 33 18 15 33 0 8 0 mtagpl 96 10 0 0 1 0 1 1 0 8 0 mbufpl 256 1493 0 0 59 0 59 59 0 8 0 bufpl 288 23997 0 17672 456 3 453 453 0 8 0 anonpl 24 3328303 0 3316754 470 364 106 145 0 186 0 amapchunkpl 152 459963 0 459061 134 96 38 49 0 158 0 amappl16 200 139980 0 139654 971 949 22 56 0 8 2 amappl15 192 15 0 15 4 4 0 1 0 8 0 amappl14 184 209 0 195 2 1 1 2 0 8 0 amappl13 176 17 0 17 5 5 0 1 0 8 0 amappl12 168 15443 0 15404 2 0 2 2 0 8 0 amappl11 160 51 0 40 1 0 1 1 0 8 0 amappl10 152 50 0 36 1 0 1 1 0 8 0 amappl9 144 306 0 305 1 0 1 1 0 8 0 amappl8 136 914 0 722 7 0 7 7 0 8 0 amappl7 128 135 0 121 2 1 1 2 0 8 0 amappl6 120 519 0 499 2 1 1 2 0 8 0 amappl5 112 546 0 536 1 0 1 1 0 8 0 amappl4 104 929 0 883 2 0 2 2 0 8 0 amappl3 96 89139 0 89044 12 9 3 4 0 8 0 amappl2 88 15508 0 15426 3 1 2 3 0 8 0 amappl1 80 59375 0 58841 22 10 12 22 0 8 0 amappl 88 142933 0 142673 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 72 140 0 10 3 0 3 3 0 8 0 uaddrrnd 24 14523 0 14488 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 14523 0 14488 1 0 1 1 0 8 0 vmmpekpl 168 122199 0 122128 4 0 4 4 0 8 0 vmmpepl 168 965658 0 963109 381 255 126 147 0 357 0 vmsppl 464 14522 0 14488 7 2 5 6 0 8 0 rwobjpl 56 326678 0 319126 169 58 111 117 0 8 0 pdppl 4096 29054 0 28976 500 418 82 90 0 8 4 pvpl 32 6021193 0 6003308 724 535 189 344 0 265 0 pmappl 248 14522 0 14488 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1646 0 769 26 0 26 26 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82bc3ff0) 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+0xb sys/dev/kcov.c:154 intr_handler(ffff8000295e7520,ffff80000006bc00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff82d03228) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82d03228) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff8000295e76f0) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000295e76f0) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x29cb35da180, count: -9 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(ffff80002121de70,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline] witness_checkorder(ffff80002121de70,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110 mtx_enter(ffff80002121de60) at mtx_enter+0x3e sys/kern/kern_lock.c:265 single_thread_set(ffff80002129da98,0,1) at single_thread_set+0x35a single_thread_wait sys/kern/kern_sig.c:2172 [inline] single_thread_set(ffff80002129da98,0,1) at single_thread_set+0x35a sys/kern/kern_sig.c:2155 sigexit(ffff80002129da98,6) at sigexit+0x90 sys/kern/kern_sig.c:1562 postsig(ffff80002129da98,6,ffff800024781bc8) at postsig+0x4a9 sys/kern/kern_sig.c:1494 userret(ffff80002129da98) at userret+0x16e sys/kern/kern_sig.c:1987 syscall(ffff800024781d00) at syscall+0x4e7 mi_syscall_return sys/sys/syscall_mi.h:137 [inline] syscall(ffff800024781d00) at syscall+0x4e7 sys/arch/amd64/amd64/trap.c:644 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x234db877960, count: -9