panic: sleep: syz-executor[58582] slept inside a no-sleep walk bracket (raw pointer held across sleep, wmesg "biowait") Stopped at db_enter+0x17: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND 24207 22589 0 0 0 1 syz-executor *377344 58582 0 0x10 0x4000010 0K syz-executor db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff84d8d160) at panic+0x270 sys/kern/subr_prf.c:198 sleep_setup(ffff800001bd4550,11,ffffffff84692f80) at sleep_setup+0x3b2 sys/kern/kern_synch.c:296 tsleep_nsec(ffff800001bd4550,11,ffffffff84692f80,ffffffffffffffff) at tsleep_nsec+0x29c sys/kern/kern_synch.c:153 biowait(ffff800001bd4550) at biowait+0xe6 sys/kern/vfs_bio.c:1110 bwrite(ffff800001bd4550) at bwrite+0x4e1 sys/kern/vfs_bio.c:625 ffs_update(ffff800001d172a8,1) at ffs_update+0x619 sys/ufs/ffs/ffs_inode.c:111 ffs_truncate(ffff800001d172a8,0,0,ffffffffffffffff) at ffs_truncate+0x12f0 sys/ufs/ffs/ffs_inode.c:-1 ufs_inactive(ffff80003bb87e00) at ufs_inactive+0x2cb sys/ufs/ufs/ufs_inode.c:84 VOP_INACTIVE(ffff800001d63600,ffff80003973a030) at VOP_INACTIVE+0x1bb sys/kern/vfs_vops.c:498 vrele(ffff800001d63600) at vrele+0x16a sys/kern/vfs_subr.c:845 ktrsettrace(ffff800029916b60,80001104,ffff800001d57200,ffff8000001191a0) at ktrsettrace+0x16c sys/kern/kern_ktrace.c:123 ktrops(ffff80003973a030,ffff800029916b60,0,80001104,ffff800001d57200,ffff8000001191a0) at ktrops+0x338 sys/kern/kern_ktrace.c:578 doktrace(ffff800001d57200,4,1104,ffffffff,ffff80003973a030) at doktrace+0x8c2 ktrsetchildren sys/kern/kern_ktrace.c:607 [inline] doktrace(ffff800001d57200,4,1104,ffffffff,ffff80003973a030) at doktrace+0x8c2 sys/kern/kern_ktrace.c:507 end trace frame: 0xffff80003bb882f0, count: 0 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 *cpu0: sleep: syz-executor[58582] slept inside a no-sleep walk bracket (raw pointer held across sleep, wmesg "biowait") ddb{0}> show kasan kasan: no report recorded this boot ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff84d8d160) at panic+0x270 sys/kern/subr_prf.c:198 sleep_setup(ffff800001bd4550,11,ffffffff84692f80) at sleep_setup+0x3b2 sys/kern/kern_synch.c:296 tsleep_nsec(ffff800001bd4550,11,ffffffff84692f80,ffffffffffffffff) at tsleep_nsec+0x29c sys/kern/kern_synch.c:153 biowait(ffff800001bd4550) at biowait+0xe6 sys/kern/vfs_bio.c:1110 bwrite(ffff800001bd4550) at bwrite+0x4e1 sys/kern/vfs_bio.c:625 ffs_update(ffff800001d172a8,1) at ffs_update+0x619 sys/ufs/ffs/ffs_inode.c:111 ffs_truncate(ffff800001d172a8,0,0,ffffffffffffffff) at ffs_truncate+0x12f0 sys/ufs/ffs/ffs_inode.c:-1 ufs_inactive(ffff80003bb87e00) at ufs_inactive+0x2cb sys/ufs/ufs/ufs_inode.c:84 VOP_INACTIVE(ffff800001d63600,ffff80003973a030) at VOP_INACTIVE+0x1bb sys/kern/vfs_vops.c:498 vrele(ffff800001d63600) at vrele+0x16a sys/kern/vfs_subr.c:845 ktrsettrace(ffff800029916b60,80001104,ffff800001d57200,ffff8000001191a0) at ktrsettrace+0x16c sys/kern/kern_ktrace.c:123 ktrops(ffff80003973a030,ffff800029916b60,0,80001104,ffff800001d57200,ffff8000001191a0) at ktrops+0x338 sys/kern/kern_ktrace.c:578 doktrace(ffff800001d57200,4,1104,ffffffff,ffff80003973a030) at doktrace+0x8c2 ktrsetchildren sys/kern/kern_ktrace.c:607 [inline] doktrace(ffff800001d57200,4,1104,ffffffff,ffff80003973a030) at doktrace+0x8c2 sys/kern/kern_ktrace.c:507 sys_ktrace(ffff80003973a030,ffff80003bb88470,ffff80003bb883e0) at sys_ktrace+0x1f6 sys/kern/kern_ktrace.c:563 syscall(ffff80003bb88470) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb88470) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6edf8f34290, count: -17 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003bb876f0 rbx 0xffff80003bb87760 rdx 0 rcx 0xffffffff851e9ff0 cpu_info_full_primary+0x1ff0 rax 0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xffff80003bb87308 r11 0xffffffff83e54b70 x86_bus_space_io_read_1 r12 0xffffffff84d8d160 .str.9 r13 0xffffffff851eac08 cpu_info_full_primary+0x2c08 r14 0xffffffff851eae07 cpu_info_full_primary+0x2e07 r15 0x1 rip 0xffffffff82f1b577 db_enter+0x17 cs 0x8 rflags 0x246 rsp 0xffff80003bb876f0 ss 0x10 db_enter+0x17: popq %rbp ddb{0}> show proc PROC (syz-executor) tid=377344 pid=58582 tcnt=4 stat=onproc flags process=10 proc=4000010 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003973aa90,0xffff80003973ba30 process=0xffff80003973f510 user=0xffff80003bb7d000, vmspace=0xffff800001c397b8 estcpu=36, cpticks=5, pctcpu=0.0, user=0, sys=4, intr=1 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 22589 24207 52537 0 7 0 0 syz-executor 22589 17698 52537 0 2 0 0x4000080 syz-executor 89201 148209 98975 0 2 0 0 syz-executor 89201 505184 98975 0 3 0 0x4000080 fsleep syz-executor 58582 134034 70199 0 2 0x10 0 syz-executor *58582 377344 70199 0 7 0x10 0x4000010 syz-executor 58582 480287 70199 0 3 0x10 0x4000080 fsleep syz-executor 58582 480863 70199 0 3 0x10 0x4000080 fsleep syz-executor 39564 155872 11709 0 2 0 0 syz-executor 39564 282874 11709 0 3 0 0x4000080 fsleep syz-executor 37481 198847 24022 0 2 0x10 0 syz-executor 37481 245128 24022 0 3 0x10 0x4000080 netcon syz-executor 71431 142503 81149 0 4 0x2010 0x80000 syz-executor 71431 9910 81149 0 2 0x2010 0x4080000 syz-executor 71431 442632 81149 0 3 0x2010 0x4002000 suspend syz-executor 64555 10663 95885 0 3 0 0x80 nanoslp syz-executor 64555 86012 95885 0 3 0 0x4000088 kqpoll syz-executor 64555 306142 95885 0 3 0 0x4000080 fsleep syz-executor 52537 89838 90267 0 2 0x2 0 syz-executor 11709 482570 90267 0 3 0x2 0x80 nanoslp syz-executor 24022 511467 90267 0 3 0x2 0x80 nanoslp syz-executor 98975 270245 90267 0 3 0x2 0x80 nanoslp syz-executor 95885 394835 90267 0 3 0x2 0x80 nanoslp syz-executor 34648 35317 90267 0 3 0x2 0x80 nanoslp syz-executor 81149 40520 90267 0 3 0x2 0x80 nanoslp syz-executor 70199 425860 90267 0 3 0x2 0x80 nanoslp syz-executor 90267 380704 60059 0 3 0x2 0x80 kqread syz-executor 60059 467578 49024 0 3 0x100002 0x88 sigsusp ksh 49024 25618 58500 0 3 0x10 0x88 kqread sshd-session 58500 77264 6520 0 3 0x12 0x80 kqread sshd-session 44378 374829 1 0 3 0x100003 0x80 ttyin getty 6520 166465 1 0 3 0 0x88 kqread sshd 25931 253948 19595 74 3 0x1100012 0x80 bpf pflogd 19595 170223 1 0 3 0 0x80 sbwait pflogd 14517 514807 67571 73 3 0x1100010 0x80 kqread syslogd 67571 379134 1 0 3 0x100002 0x80 sbwait syslogd 71321 317912 1 0 3 0x100000 0x80 kqread resolvd 80388 272338 73037 77 3 0x100012 0x80 kqread dhcpleased 91125 493248 73037 77 3 0x100012 0x80 kqread dhcpleased 73037 465324 1 0 3 0 0x80 kqread dhcpleased 86042 137553 0 0 3 0x14000 0x200 bored smr 78267 164729 0 0 2 0x14000 0x200 zerothread 93236 82978 0 0 3 0x14000 0x200 aiodoned aiodoned 57899 66094 0 0 3 0x14000 0x200 syncer update 73371 222320 0 0 3 0x14000 0x200 cleaner cleaner 29550 338558 0 0 3 0x14000 0x200 reaper reaper 6001 147476 0 0 3 0x14000 0x200 pgdaemon pagedaemon 48272 111399 0 0 3 0x14000 0x200 bored viomb 86583 276103 0 0 3 0x14000 0x40000200 acpi0 acpi0 39084 27426 0 0 3 0x14000 0x40000200 idle1 11926 512488 0 0 3 0x14000 0x200 bored softnet1 29793 115306 0 0 2 0x14000 0x200 softnet0 31919 29235 0 0 3 0x14000 0x200 bored systqmp 5109 516091 0 0 3 0x14000 0x200 bored systq 81627 506770 0 0 3 0x14000 0x200 tmoslp softclockmp 92413 84074 0 0 3 0x14000 0x40000200 tmoslp softclock 91186 379525 0 0 3 0x14000 0x40000200 idle0 1 69904 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks Process 58582 (syz-executor) thread 0xffff80003973a030 (377344) exclusive rrwlock inode r = 0 (0xffff800001d17348) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xf0 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0x17e sys/kern/vfs_vops.c:527 #4 vn_lock+0xca sys/kern/vfs_vnops.c:576 #5 vrele+0x113 sys/kern/vfs_subr.c:836 #6 ktrsettrace+0x16c sys/kern/kern_ktrace.c:123 #7 ktrops+0x338 sys/kern/kern_ktrace.c:578 #8 doktrace+0x8c2 ktrsetchildren sys/kern/kern_ktrace.c:607 [inline] #8 doktrace+0x8c2 sys/kern/kern_ktrace.c:507 #9 sys_ktrace+0x1f6 sys/kern/kern_ktrace.c:563 #10 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff85d52380) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0x1048 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11060 12323K 12466K 166960K 12358 0 pcb 18 26K 27K 166960K 42 0 rtable 237 12K 13K 166960K 351 0 pf 34 22K 22K 166960K 45 0 ifaddr 43 12K 12K 166960K 45 0 ifgroup 55 2K 2K 166960K 55 0 sysctl 4 1K 13K 166960K 8 0 counters 70 42K 42K 166960K 70 0 ioctlops 0 0K 4K 166960K 1593 0 iov 0 0K 16K 166960K 6 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1333 86K 86K 166960K 1474 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 2 2K 6K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 48 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 292K 166960K 11964 0 file desc 18 65K 93K 166960K 241 0 sigio 0 0K 0K 166960K 34 0 proc 74 144K 177K 166960K 567 0 subproc 72 9K 9K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 in_multi 99 7K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 14 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 55 384K 384K 166960K 55 0 exec 0 0K 2K 166960K 384 0 fusefs mount 1 36K 36K 166960K 1 0 tdb 3 1K 1K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 242 245K 268K 166960K 3998 0 UVM aobj 10 4K 4K 166960K 10 0 pinsyscall 1067 1763K 1763K 166960K 1400 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 12 0K 1K 166960K 28 0 temp 40 9163K 9176K 166960K 4174 0 kqueue 16 52K 54K 166960K 38 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 28 0 0 1 0 1 1 0 8 0 rtpcb 120 34 0 31 1 0 1 1 0 8 0 rtentry 176 111 0 1 5 0 5 5 0 8 0 unpcb 144 314 0 297 6 4 2 6 0 8 1 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 736 22 0 17 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 147 0 135 4 0 4 4 0 8 2 nd6 152 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 30 0 0 1 0 1 1 0 8 0 pfstkey 128 30 0 0 1 0 1 1 0 8 0 pfstate 448 30 0 0 4 0 4 4 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 452 0 0 29 0 29 29 0 8 0 art_table 40 453 0 0 5 0 5 5 0 8 0 art_node 32 111 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 4 2 1 1 1 0 8 1 semapl 72 46 0 36 1 0 1 1 0 8 0 shmpl 112 7 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1745 0 269 93 0 93 93 0 8 0 ffsino 296 1745 0 269 114 0 114 114 0 8 0 nchpl 144 2092 0 382 64 0 64 64 0 8 0 vnodes 216 1915 0 0 107 0 107 107 0 8 0 namei 1024 6844 0 6844 4 3 1 2 0 8 1 percpumem 16 51 0 0 1 0 1 1 0 8 0 kstatmem 264 27 0 0 2 0 2 2 0 8 0 scxspl 216 7672 0 7671 10 9 1 8 1 8 0 plimitpl 152 35 0 16 1 0 1 1 0 8 0 sigapl 424 559 0 511 7 1 6 7 0 8 0 knotepl 120 71 0 0 3 0 3 3 0 8 0 kqueuepl 224 134 0 122 5 4 1 5 0 8 0 pipepl 344 151 0 123 3 0 3 3 0 8 0 fdescpl 528 543 0 511 3 0 3 3 0 8 0 filepl 160 2721 0 2356 24 8 16 18 0 8 0 lockfpl 104 31 0 27 1 0 1 1 0 8 0 lockfspl 48 16 0 12 1 0 1 1 0 8 0 sessionpl 144 30 0 20 1 0 1 1 0 8 0 pgrppl 48 40 0 22 1 0 1 1 0 8 0 ucredpl 104 233 0 217 1 0 1 1 0 8 0 zombiepl 144 512 0 511 2 1 1 1 0 8 0 processpl 1232 559 0 511 5 0 5 5 0 8 0 procpl 664 751 0 692 7 1 6 6 0 8 1 sosppl 176 2 0 2 2 1 1 1 0 8 1 sockpl 752 499 0 467 20 13 7 16 0 8 3 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 10 0 0 2 0 2 2 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k128 9344 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 126 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 17 0 0 3 0 3 3 0 8 0 mextrefs 64 20 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 168 0 0 10 0 10 10 0 8 0 bufpl 272 2522 0 106 162 0 162 162 0 8 0 anonpl 32 3825 0 0 31 0 31 31 0 222 0 amapchunkpl 152 11457 0 10950 24 3 21 22 0 158 1 amappl16 200 1979 0 1951 6 4 2 5 0 8 0 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 434 0 433 1 0 1 1 0 8 0 amappl13 176 124 0 111 1 0 1 1 0 8 0 amappl12 168 821 0 789 2 0 2 2 0 8 0 amappl11 160 45 0 45 1 1 0 1 0 8 0 amappl10 152 64 0 50 1 0 1 1 0 8 0 amappl9 144 302 0 302 1 1 0 1 0 8 0 amappl8 136 99 0 97 1 0 1 1 0 8 0 amappl7 128 159 0 146 1 0 1 1 0 8 0 amappl6 120 157 0 156 1 0 1 1 0 8 0 amappl5 112 101 0 91 1 0 1 1 0 8 0 amappl4 104 295 0 276 1 0 1 1 0 8 0 amappl3 96 2198 0 2077 5 1 4 4 0 8 0 amappl2 88 542 0 479 2 0 2 2 0 8 0 amappl1 80 10860 0 10249 15 2 13 15 0 8 0 amappl 88 3254 0 3084 4 0 4 4 0 92 0 uvmvnodes 80 99 0 0 3 0 3 3 0 8 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 9 0 0 1 0 1 1 0 8 0 uaddrrnd 24 543 0 511 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 543 0 511 1 0 1 1 0 8 0 vmmpekpl 168 6408 0 6372 2 0 2 2 0 8 0 vmmpepl 168 43726 0 41758 91 4 87 87 0 357 1 vmsppl 488 542 0 511 5 1 4 5 0 8 0 rwobjpl 80 15830 0 14782 25 2 23 25 0 8 0 pdppl 4096 1094 0 1022 104 32 72 86 0 8 0 pvpl 32 10586 0 0 89 3 86 87 0 265 0 pmappl 256 542 0 511 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 120 446 0 40 13 0 13 13 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff84d8d160) at panic+0x270 sys/kern/subr_prf.c:198 sleep_setup(ffff800001bd4550,11,ffffffff84692f80) at sleep_setup+0x3b2 sys/kern/kern_synch.c:296 tsleep_nsec(ffff800001bd4550,11,ffffffff84692f80,ffffffffffffffff) at tsleep_nsec+0x29c sys/kern/kern_synch.c:153 biowait(ffff800001bd4550) at biowait+0xe6 sys/kern/vfs_bio.c:1110 bwrite(ffff800001bd4550) at bwrite+0x4e1 sys/kern/vfs_bio.c:625 ffs_update(ffff800001d172a8,1) at ffs_update+0x619 sys/ufs/ffs/ffs_inode.c:111 ffs_truncate(ffff800001d172a8,0,0,ffffffffffffffff) at ffs_truncate+0x12f0 sys/ufs/ffs/ffs_inode.c:-1 ufs_inactive(ffff80003bb87e00) at ufs_inactive+0x2cb sys/ufs/ufs/ufs_inode.c:84 VOP_INACTIVE(ffff800001d63600,ffff80003973a030) at VOP_INACTIVE+0x1bb sys/kern/vfs_vops.c:498 vrele(ffff800001d63600) at vrele+0x16a sys/kern/vfs_subr.c:845 ktrsettrace(ffff800029916b60,80001104,ffff800001d57200,ffff8000001191a0) at ktrsettrace+0x16c sys/kern/kern_ktrace.c:123 ktrops(ffff80003973a030,ffff800029916b60,0,80001104,ffff800001d57200,ffff8000001191a0) at ktrops+0x338 sys/kern/kern_ktrace.c:578 doktrace(ffff800001d57200,4,1104,ffffffff,ffff80003973a030) at doktrace+0x8c2 ktrsetchildren sys/kern/kern_ktrace.c:607 [inline] doktrace(ffff800001d57200,4,1104,ffffffff,ffff80003973a030) at doktrace+0x8c2 sys/kern/kern_ktrace.c:507 sys_ktrace(ffff80003973a030,ffff80003bb88470,ffff80003bb883e0) at sys_ktrace+0x1f6 sys/kern/kern_ktrace.c:563 syscall(ffff80003bb88470) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb88470) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6edf8f34290, count: -17 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x19: leave x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 end of kernel end trace frame: 0x6fa0102da230, count: 12 ddb{1}> trace x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 end of kernel end trace frame: 0x6fa0102da230, count: -3