uvm_fault(0xffffffff83a1dec0, 0xffff800026553ec0, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x52: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND 73365 38843 0 0 0 0 syz-executor memset() at memset+0x52 ffs_write(ffff80002efa5480) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd805f45ab18,ffff80002efa5518,23,fffffd80097fd680) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd805f45ab18,ffff80002efa5650,40,0,1,1b8ef7ddc9f14f7d,0,1008,80) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 acct_process(ffff8000fffee548) at acct_process+0x7a2 sys/kern/kern_acct.c:245 exit1(ffff8000fffee548,0,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff8000fffee548,ffff80002efa5890,ffff80002efa57e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002efa5890) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002efa5890) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79771ae31e00, count: 6 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xffffffff83a1dec0, 0xffff800026553ec0, 0, 2) -> d ddb{1}> trace memset() at memset+0x52 ffs_write(ffff80002efa5480) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd805f45ab18,ffff80002efa5518,23,fffffd80097fd680) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd805f45ab18,ffff80002efa5650,40,0,1,1b8ef7ddc9f14f7d,0,1008,80) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 acct_process(ffff8000fffee548) at acct_process+0x7a2 sys/kern/kern_acct.c:245 exit1(ffff8000fffee548,0,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff8000fffee548,ffff80002efa5890,ffff80002efa57e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002efa5890) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002efa5890) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79771ae31e00, count: -9 ddb{1}> show registers rdi 0xffff800026553ec0 rsi 0 rbp 0xffff80002efa53a0 rbx 0x1ec0 __ALIGN_SIZE+0xec0 rdx 0 rcx 0x28 rax 0 r8 0x140 r9 0xffff80002efa5300 r10 0x899d2bf145feec97 r11 0xffff800026553ec0 r12 0x1ec0 __ALIGN_SIZE+0xec0 r13 0x2000 __ALIGN_SIZE+0x1000 r14 0xfffffd805f45ab18 r15 0x1 rip 0xffffffff8185c7b2 memset+0x52 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff80002efa5198 ss 0 memset+0x52: repe stosq %es:(%rdi) ddb{1}> show proc PROC (syz-executor) tid=200191 pid=34575 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=0, usrpri=73, slppri=0, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000fffee548 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000fffeea78,0xffff80003c417cc0 process=0xffff80002a39e698 user=0xffff80002efa0000, vmspace=0xfffffd806054fba0 estcpu=23, cpticks=6, pctcpu=0.3, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 54947 338280 90501 0 2 0 syz-executor 54947 167540 90501 0 3 0x4000080 fsleep syz-executor 54175 282655 76355 0 3 0x80 fsleep syz-executor 54175 87599 76355 0 3 0x4000080 fifor syz-executor 7700 230141 18899 0 3 0x80 fsleep syz-executor 7700 66001 18899 0 3 0x4000080 fsleep syz-executor 7700 359892 18899 0 3 0x4000080 fifow syz-executor 38843 73365 77457 0 7 0 syz-executor 38843 56001 77457 0 3 0x4000080 fsleep syz-executor 30199 96681 39794 0 3 0x80 fsleep syz-executor 30199 235718 39794 0 3 0x4000080 fsleep syz-executor 30199 280705 39794 0 3 0x4000080 kqread syz-executor 64633 28807 52936 0 3 0x80 fsleep syz-executor 64633 211849 52936 0 3 0x4000080 sbwait syz-executor 36104 287214 0 0 3 0x14200 acct acct 18899 420969 63850 0 3 0x82 nanoslp syz-executor 77457 168971 63850 0 3 0x82 nanoslp syz-executor 39794 160564 63850 0 3 0x82 nanoslp syz-executor 52936 304578 63850 0 3 0x82 nanoslp syz-executor 38923 116262 63850 0 3 0x82 nanoslp syz-executor 76355 215177 63850 0 3 0x82 nanoslp syz-executor 90501 60316 63850 0 3 0x82 nanoslp syz-executor 63850 104226 4589 0 3 0x82 wait syz-executor 4589 462900 12235 0 3 0x10008a sigsusp ksh 12235 318544 68560 0 3 0x98 kqread sshd-session 68560 223187 16732 0 3 0x92 kqread sshd-session 72665 128008 1 0 3 0x100083 ttyin getty 16732 70139 1 0 3 0x88 kqread sshd 52783 493104 86142 74 3 0x1100092 bpf pflogd 86142 180059 1 0 3 0x80 sbwait pflogd 73380 111059 27821 73 3 0x1100090 kqread syslogd 27821 399391 1 0 3 0x100082 sbwait syslogd 59019 233557 1 0 3 0x100080 kqread resolvd 66619 338218 76037 77 3 0x100092 kqread dhcpleased 30096 306509 76037 77 3 0x100092 kqread dhcpleased 76037 158671 1 0 3 0x80 kqread dhcpleased 88225 518747 0 0 3 0x14200 bored smr 51581 218680 0 0 3 0x14200 pgzero zerothread 44178 259797 0 0 3 0x14200 aiodoned aiodoned 11601 281883 0 0 3 0x14200 syncer update 78956 517112 0 0 3 0x14200 cleaner cleaner 93514 490086 0 0 3 0x14200 reaper reaper 73799 314261 0 0 3 0x14200 pgdaemon pagedaemon 12077 87575 0 0 3 0x14200 bored viomb 89513 302954 0 0 3 0x40014200 acpi0 acpi0 34624 497602 0 0 3 0x40014200 idle1 88983 352358 0 0 3 0x14200 bored softnet1 69740 473305 0 0 3 0x14200 bored softnet0 97196 104428 0 0 3 0x14200 bored systqmp 5786 85751 0 0 3 0x14200 bored systq 70970 407631 0 0 3 0x14200 tmoslp softclockmp 25385 53178 0 0 3 0x40014200 tmoslp softclock 88899 220421 0 0 3 0x40014200 idle0 1 57429 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 38843 (syz-executor) thread 0xffff80003c417cb0 (73365) exclusive rwlock uobjlk r = 0 (0xfffffd806d952e10) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 uvm_fault+0x1e5 sys/uvm/uvm_fault.c:649 #3 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #4 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806054fab8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 Process 64633 (syz-executor) thread 0xffff8000fffef240 (211849) exclusive rwlock sbufrcv r = 0 (0xffff800001615888) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 sblock+0xb6 sys/kern/uipc_socket2.c:536 #3 soreceive+0x27d sys/kern/uipc_socket.c:890 #4 recvit+0x40b sys/kern/uipc_syscalls.c:1078 #5 sys_recvmmsg+0x410 sys/kern/uipc_syscalls.c:969 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #7 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11065 12089K 12613K 166960K 12834 0 pcb 17 12K 12K 166960K 93 0 rtable 215 9K 10K 166960K 415 0 pf 36 18K 25K 166960K 133 0 ifaddr 39 6K 8K 166960K 73 0 ifgroup 51 2K 2K 166960K 120 0 sysctl 4 1K 9K 166960K 10 0 counters 68 36K 37K 166960K 130 0 ioctlops 0 0K 4K 166960K 1575 0 iov 1 4K 20K 166960K 19 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1358 85K 86K 166960K 1878 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 12 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 23 0 dirhash 12 2K 3K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 232K 166960K 652 0 sigio 0 0K 0K 166960K 4 0 proc 72 115K 164K 166960K 592 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 81 0 in_multi 88 6K 7K 166960K 123 0 ether_multi 1 0K 0K 166960K 6 0 mrt 0 0K 0K 166960K 20 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 449 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 233 167K 193K 166960K 7730 0 UVM aobj 81 3K 3K 166960K 81 0 pinsyscall 42 84K 106K 166960K 1806 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 32 0 NDP 11 0K 1K 166960K 47 0 temp 50 9081K 9149K 166960K 32167 0 kqueue 14 22K 30K 166960K 112 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 63 0 60 1 0 1 1 0 8 0 rtentry 176 124 0 34 7 1 6 6 0 8 0 unpcb 144 268 0 245 2 0 2 2 0 8 1 syncache 336 6 0 6 3 2 1 1 0 8 1 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 129 0 124 1 0 1 1 0 8 0 arp 136 19 0 4 1 0 1 1 0 8 0 inpcb 328 456 0 448 4 2 2 4 0 8 1 nd6 152 25 0 3 1 0 1 1 0 8 0 pkpcb 40 5 0 5 2 2 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 21 0 21 2 1 1 1 0 8 1 pppxif 1576 5 0 5 2 2 0 1 0 8 0 pffrag 232 7 0 4 1 0 1 1 0 482 0 pffrnode 88 7 0 4 1 0 1 1 0 8 0 pffrent 40 12 0 9 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 pfsrclim 320 1 0 1 1 0 1 1 0 8 1 pfanchor 1288 4 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 55 0 9 1 0 1 1 0 8 0 pfstkey 128 61 0 15 2 0 2 2 0 8 0 pfstate 448 57 0 12 6 0 6 6 0 8 0 pfrule 1360 32 0 26 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 522 0 119 29 1 28 29 0 8 0 art_table 40 523 0 119 5 0 5 5 0 8 0 art_node 32 122 0 41 1 0 1 1 0 8 0 sysvmsgpl 40 7 0 4 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 21 0 11 1 0 1 1 0 8 0 shmpl 112 78 0 0 3 0 3 3 0 8 0 dirhash 1024 28 0 11 3 0 3 3 0 8 0 dino2pl 256 2554 0 1090 93 0 93 93 0 8 0 ffsino 296 2556 0 1092 115 1 114 115 0 8 0 nchpl 144 3564 0 1858 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 0 1 1 0 8 1 vnodes 216 2973 0 0 166 0 166 166 0 8 0 namei 1024 11850 0 11850 3 2 1 2 0 8 1 percpumem 16 80 0 31 1 0 1 1 0 8 0 kstatmem 264 64 0 40 3 1 2 3 0 8 0 scsiplug 72 5 0 5 2 1 1 1 0 8 1 scxspl 216 20991 0 20991 17 9 8 8 1 8 8 plimitpl 152 148 0 129 1 0 1 1 0 8 0 sigapl 424 958 0 910 7 1 6 7 0 8 0 knotepl 120 568 0 0 18 0 18 18 0 8 0 kqueuepl 224 219 0 209 4 3 1 3 0 8 0 pipepl 344 156 0 129 3 0 3 3 0 8 0 fdescpl 528 941 0 911 3 0 3 3 0 8 0 filepl 160 4909 0 4695 18 2 16 18 0 8 6 lockfpl 104 331 0 328 2 1 1 2 0 8 0 lockfspl 48 156 0 153 1 0 1 1 0 8 0 sessionpl 144 38 0 29 1 0 1 1 0 8 0 pgrppl 48 48 0 31 1 0 1 1 0 8 0 ucredpl 104 618 0 605 1 0 1 1 0 8 0 zombiepl 144 912 0 910 1 0 1 1 0 8 0 processpl 1232 958 0 910 5 1 4 5 0 8 0 procpl 664 1817 0 1761 6 0 6 6 0 8 0 sosppl 176 1 0 1 1 1 0 1 0 8 0 sockpl 752 862 0 828 8 3 5 7 0 8 1 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 123 0 0 16 0 16 16 0 8 0 mcl2k 2048 20 0 0 3 0 3 3 0 8 0 mtagpl 96 74 0 0 2 0 2 2 0 8 0 mbufpl 256 267 0 0 17 0 17 17 0 8 0 bufpl 280 8668 0 2538 438 0 438 438 0 8 0 anonpl 32 13163 0 0 107 0 107 107 0 246 0 amapchunkpl 152 26150 0 25660 44 12 32 35 0 158 10 amappl16 200 4178 0 3676 48 15 33 33 0 8 0 amappl15 192 3 0 2 1 0 1 1 0 8 0 amappl14 184 429 0 427 1 0 1 1 0 8 0 amappl13 176 133 0 121 1 0 1 1 0 8 0 amappl12 168 1195 0 1165 2 0 2 2 0 8 0 amappl11 160 5 0 5 2 2 0 1 0 8 0 amappl10 152 66 0 52 1 0 1 1 0 8 0 amappl9 144 285 0 285 1 1 0 1 0 8 0 amappl8 136 99 0 97 1 0 1 1 0 8 0 amappl7 128 156 0 142 1 0 1 1 0 8 0 amappl6 120 160 0 158 1 0 1 1 0 8 0 amappl5 112 103 0 92 1 0 1 1 0 8 0 amappl4 104 311 0 289 1 0 1 1 0 8 0 amappl3 96 4903 0 4790 4 0 4 4 0 8 0 amappl2 88 584 0 518 2 0 2 2 0 8 0 amappl1 80 12697 0 12094 21 5 16 17 0 8 1 amappl 88 6903 0 6741 5 0 5 5 0 92 0 uvmvnodes 80 117 0 0 3 0 3 3 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 256 0 256 3 2 1 1 0 8 1 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 80 0 0 2 0 2 2 0 8 0 uaddrrnd 24 941 0 910 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 941 0 910 1 0 1 1 0 8 0 vmmpekpl 168 9656 0 9619 2 0 2 2 0 8 0 vmmpepl 168 69769 0 67374 125 12 113 113 0 357 1 vmsppl 488 940 0 910 7 2 5 5 0 8 0 rwobjpl 80 22554 0 20944 39 3 36 36 0 8 0 pdppl 4096 1889 0 1820 103 28 75 85 0 8 6 pvpl 32 20309 0 0 166 2 164 164 0 265 0 pmappl 256 940 0 910 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 293 0 39 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8388bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff839d7d40) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839d7d40) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff839d7d40) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839d7d40) at __mp_lock+0x192 sys/kern/kern_lock.c:173 uvm_fault(fffffd806054f9b8,50d31da0000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650 upageflttrap(ffff80003c3ebae0,50d31da0000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c3ebae0) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x77987a1f9f20, count: 2 ddb{0}> trace x86_ipi_db(ffffffff8388bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff839d7d40) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839d7d40) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff839d7d40) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839d7d40) at __mp_lock+0x192 sys/kern/kern_lock.c:173 uvm_fault(fffffd806054f9b8,50d31da0000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650 upageflttrap(ffff80003c3ebae0,50d31da0000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c3ebae0) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x77987a1f9f20, count: -13 ddb{0}> machine ddbcpu 1 Stopped at memset+0x52: repe stosq %es:(%rdi) memset() at memset+0x52 ffs_write(ffff80002efa5480) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd805f45ab18,ffff80002efa5518,23,fffffd80097fd680) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd805f45ab18,ffff80002efa5650,40,0,1,1b8ef7ddc9f14f7d,0,1008,80) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 acct_process(ffff8000fffee548) at acct_process+0x7a2 sys/kern/kern_acct.c:245 exit1(ffff8000fffee548,0,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff8000fffee548,ffff80002efa5890,ffff80002efa57e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002efa5890) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002efa5890) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79771ae31e00, count: 6 ddb{1}> trace memset() at memset+0x52 ffs_write(ffff80002efa5480) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd805f45ab18,ffff80002efa5518,23,fffffd80097fd680) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd805f45ab18,ffff80002efa5650,40,0,1,1b8ef7ddc9f14f7d,0,1008,80) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 acct_process(ffff8000fffee548) at acct_process+0x7a2 sys/kern/kern_acct.c:245 exit1(ffff8000fffee548,0,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff8000fffee548,ffff80002efa5890,ffff80002efa57e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002efa5890) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002efa5890) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79771ae31e00, count: -9