kernel: protection fault trap, code=0 Stopped at sys_semop+0x3ae: movzwl 0x8(%rax,%rcx,4),%r15d ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace sys_semop(ffff8000ffff94b8,ffff800039cde250,ffff800039cde1a0) at sys_semop+0x3ae sys/kern/sysv_sem.c:620 syscall(ffff800039cde250) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039cde250) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4e047512fb0, count: -3 ddb{0}> show registers rdi 0 rsi 0x6966 __ALIGN_SIZE+0x5966 rbp 0xffff800039cde170 rbx 0 rdx 0 rcx 0x8d8a __ALIGN_SIZE+0x7d8a rax 0xdeadbeefdeadbeef r8 0x7f7fffffc000 r9 0 r10 0xd254dfafa4f14c74 r11 0x581f58206f549b35 r12 0xffff800001541f04 r13 0x6966 __ALIGN_SIZE+0x5966 r14 0xffff800039cde250 r15 0x6966 __ALIGN_SIZE+0x5966 rip 0xffffffff81017e7e sys_semop+0x3ae cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800039cde050 ss 0x10 sys_semop+0x3ae: movzwl 0x8(%rax,%rcx,4),%r15d ddb{0}> show proc PROC (syz-executor) tid=206596 pid=22283 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff9748,0xffff8000ffff8a88 process=0xffff80003c596238 user=0xffff800039cd9000, vmspace=0xfffffd806eb94ab8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 22283 129338 35755 0 7 0 syz-executor 22283 427090 35755 0 2 0x4000000 syz-executor *22283 206596 35755 0 7 0x4000000 syz-executor 22283 112597 35755 0 2 0x4000000 syz-executor 40631 205475 38634 0 3 0x80 fsleep syz-executor 40631 175645 38634 0 3 0x4000080 kqread syz-executor 13392 86168 81713 0 3 0x80 fsleep syz-executor 13392 189326 81713 0 3 0x4000080 msgwait syz-executor 21457 48058 10278 0 3 0x80 fsleep syz-executor 21457 341508 10278 0 3 0x4000080 ttyin syz-executor 27755 509657 56242 0 3 0x80 fsleep syz-executor 27755 416199 56242 0 3 0x4000080 fifor syz-executor 93587 509267 37904 -1 3 0x90 fsleep syz-executor 93587 294246 37904 -1 3 0x4000090 kqsel syz-executor 3460 452789 20345 0 3 0x80 fsleep syz-executor 3460 277555 20345 0 3 0x4000080 pipewr syz-executor 3460 381676 20345 0 3 0x4000080 fsleep syz-executor 88416 169679 0 0 3 0x14280 nfsidl nfsio 67608 292434 0 0 3 0x14280 nfsidl nfsio 33059 242337 0 0 3 0x14280 nfsidl nfsio 5486 347103 0 0 3 0x14280 nfsidl nfsio 67544 432087 0 0 3 0x14280 nfsidl nfsio 60426 155088 0 0 3 0x14280 nfsidl nfsio 65757 249389 0 0 3 0x14280 nfsidl nfsio 96486 386206 0 0 3 0x14280 nfsidl nfsio 1429 269339 0 0 3 0x14280 nfsidl nfsio 3310 300467 0 0 3 0x14280 nfsidl nfsio 38282 249631 0 0 3 0x14280 nfsidl nfsio 14826 385939 0 0 3 0x14280 nfsidl nfsio 26898 231796 0 0 3 0x14280 nfsidl nfsio 37542 231402 0 0 3 0x14280 nfsidl nfsio 53938 477535 0 0 3 0x14280 nfsidl nfsio 20788 296248 0 0 3 0x14280 nfsidl nfsio 79747 417054 0 0 3 0x14280 nfsidl nfsio 60871 178383 0 0 3 0x14280 nfsidl nfsio 53503 215956 0 0 3 0x14280 nfsidl nfsio 88226 352720 0 0 3 0x14280 nfsidl nfsio 29173 226260 0 0 3 0x14200 bored sosplice 56242 244615 38969 0 3 0x82 nanoslp syz-executor 35755 133723 38969 0 3 0x82 nanoslp syz-executor 38634 265221 38969 0 3 0x82 nanoslp syz-executor 41521 463956 38969 0 3 0x82 nanoslp syz-executor 10278 289703 38969 0 3 0x82 nanoslp syz-executor 20345 326186 38969 0 3 0x82 nanoslp syz-executor 37904 217247 38969 0 3 0x82 nanoslp syz-executor 81713 219725 38969 0 3 0x82 nanoslp syz-executor 38969 437601 33026 0 3 0x82 kqread syz-executor 33026 73216 19179 0 3 0x10008a sigsusp ksh 19179 394161 19987 0 3 0x98 kqread sshd-session 19987 192036 85313 0 3 0x92 kqread sshd-session 91950 64183 1 0 3 0x100083 ttyin getty 85313 198964 1 0 3 0x88 kqread sshd 89378 338085 91297 74 3 0x1100092 bpf pflogd 91297 33741 1 0 3 0x80 sbwait pflogd 88544 357575 61316 73 3 0x1100090 kqread syslogd 61316 34468 1 0 3 0x100082 sbwait syslogd 9205 17998 1 0 3 0x100080 kqread resolvd 97804 317479 11903 77 3 0x100092 kqread dhcpleased 14366 16819 11903 77 3 0x100092 kqread dhcpleased 11903 192063 1 0 3 0x80 kqread dhcpleased 35287 206904 0 0 3 0x14200 bored smr 96314 112701 0 0 3 0x14200 pgzero zerothread 39355 456302 0 0 3 0x14200 aiodoned aiodoned 21187 435538 0 0 3 0x14200 syncer update 47002 104413 0 0 3 0x14200 cleaner cleaner 52539 276764 0 0 3 0x14200 reaper reaper 99646 378999 0 0 3 0x14200 pgdaemon pagedaemon 57142 9661 0 0 3 0x14200 bored viomb 43731 219768 0 0 3 0x40014200 acpi0 acpi0 1323 186022 0 0 3 0x40014200 idle1 2340 454733 0 0 3 0x14200 bored softnet3 97117 389626 0 0 3 0x14200 bored softnet2 15580 454672 0 0 3 0x14200 bored softnet1 47119 181616 0 0 3 0x14200 bored softnet0 43966 267366 0 0 3 0x14200 bored systqmp 27328 118015 0 0 3 0x14200 bored systq 41496 220929 0 0 3 0x14200 tmoslp softclockmp 48672 488949 0 0 3 0x40014200 tmoslp softclock 44320 50427 0 0 3 0x40014200 idle0 1 202104 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 22283 (syz-executor) thread 0xffff8000ffff94b8 (206596) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8394c480) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 __mp_acquire_count+0x58 #2 mi_switch+0x4b7 sys/kern/sched_bsd.c:441 #3 yield+0x6a sys/kern/sched_bsd.c:320 #4 malloc+0xe5 sys/kern/kern_malloc.c:174 #5 sys_semop+0x234 sys/kern/sysv_sem.c:564 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 22283 (syz-executor) thread 0xffff8000ffff8a78 (112597) exclusive rwlock futex r = 0 (0xffffffff83895658) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 sys_futex+0x69 sys/kern/sys_futex.c:98 #3 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #4 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10214 11094K 11487K 166960K 12194 0 pcb 20 14K 16K 166960K 154 0 rtable 238 9K 9K 166960K 393 0 pf 38 18K 20K 166960K 72 0 ifaddr 44 7K 7K 166960K 57 0 ifgroup 61 2K 2K 166960K 84 0 sysctl 3 1K 1K 166960K 3 0 counters 68 36K 37K 166960K 84 0 ioctlops 0 0K 4K 166960K 1578 0 iov 0 0K 16K 166960K 18 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1463 92K 92K 166960K 1821 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 18 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 17 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 514 0 sigio 0 0K 0K 166960K 8 0 proc 72 91K 152K 166960K 575 0 subproc 72 4K 4K 166960K 75 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 64 0 in_multi 98 7K 7K 166960K 118 0 ether_multi 1 0K 0K 166960K 6 0 mrt 1 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 121 546K 546K 166960K 121 0 exec 0 0K 1K 166960K 469 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 234 73K 87K 166960K 6240 0 UVM aobj 27 2K 2K 166960K 28 0 pinsyscall 43 86K 106K 166960K 1594 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 23 0 NDP 14 0K 2K 166960K 37 0 temp 56 8635K 8700K 166960K 8401 0 kqueue 14 22K 28K 166960K 93 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 59 0 55 1 0 1 1 0 8 0 rtentry 112 115 0 8 4 0 4 4 0 8 0 unpcb 144 213 0 190 1 0 1 1 0 8 0 syncache 336 6 0 6 3 2 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 808 194 0 189 9 2 7 7 0 8 6 arp 120 18 0 2 1 0 1 1 0 8 0 inpcb 376 710 0 699 14 6 8 8 0 8 6 nd6 136 25 0 0 1 0 1 1 0 8 0 pkpcb 40 3 0 3 2 1 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 5 0 4 3 2 1 1 0 8 0 pppxif 1472 1 0 1 1 1 0 1 0 8 0 pffrag 232 5 0 1 1 0 1 1 0 482 0 pffrnode 88 5 0 1 1 0 1 1 0 8 0 pffrent 40 8 0 4 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 43 0 1 1 0 1 1 0 8 0 pfstkey 128 43 0 1 2 0 2 2 0 8 0 pfstate 376 43 0 1 5 0 5 5 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 461 0 10 29 0 29 29 0 8 0 art_table 32 462 0 10 4 0 4 4 0 8 0 art_node 16 112 0 15 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 8 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 14 0 5 1 0 1 1 0 8 0 shmpl 112 25 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2270 0 771 95 0 95 95 0 8 0 ffsino 280 2270 0 771 109 0 109 109 0 8 0 nchpl 144 2972 0 1280 63 0 63 63 0 8 0 rtmask 32 1 0 1 1 1 0 1 0 8 0 uvmvnodes 80 2652 0 0 55 0 55 55 0 8 0 vnodes 216 2652 0 0 148 0 148 148 0 8 0 namei 1024 10042 0 10041 3 2 1 2 0 8 0 percpumem 16 56 0 8 1 0 1 1 0 8 0 kstatmem 264 40 0 12 3 1 2 3 0 8 0 scsiplug 72 3 0 3 2 2 0 1 0 8 0 scxspl 216 9279 0 9279 9 6 3 5 1 8 3 plimitpl 152 149 0 132 1 0 1 1 0 8 0 sigapl 424 823 0 752 10 1 9 9 0 8 0 futexpl 64 6283 0 6275 1 0 1 1 0 8 0 knotepl 120 761 0 0 24 0 24 24 0 8 0 kqueuepl 216 135 0 124 1 0 1 1 0 8 0 pipepl 328 174 0 146 3 0 3 3 0 8 0 fdescpl 504 784 0 752 6 1 5 6 0 8 0 filepl 152 4690 0 4465 14 2 12 12 0 8 3 lockfpl 104 121 0 118 1 0 1 1 0 8 0 lockfspl 48 53 0 50 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 39 0 21 1 0 1 1 0 8 0 ucredpl 104 820 0 804 1 0 1 1 0 8 0 zombiepl 144 834 0 833 1 0 1 1 0 8 0 processpl 1168 823 0 752 7 1 6 6 0 8 0 procpl 656 1467 0 1386 8 0 8 8 0 8 0 sosppl 168 3 0 3 2 1 1 1 0 8 1 sockpl 688 990 0 952 16 6 10 10 0 8 5 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 106 0 0 14 0 14 14 0 8 0 mcl2k 2048 26 0 0 4 0 4 4 0 8 0 mtagpl 96 21 0 0 1 0 1 1 0 8 0 mbufpl 256 248 0 0 16 0 16 16 0 8 0 bufpl 280 2850 0 133 195 0 195 195 0 8 0 anonpl 24 131410 0 127958 30 5 25 29 0 184 0 amapchunkpl 152 19777 0 19251 31 1 30 30 0 158 9 amappl16 200 2488 0 2453 9 6 3 6 0 8 0 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 115 0 103 1 0 1 1 0 8 0 amappl13 176 8 0 8 1 1 0 1 0 8 0 amappl12 168 1425 0 1393 4 2 2 3 0 8 0 amappl11 160 53 0 39 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 251 0 251 1 1 0 1 0 8 0 amappl8 136 38 0 35 1 0 1 1 0 8 0 amappl7 128 113 0 100 1 0 1 1 0 8 0 amappl6 120 199 0 196 1 0 1 1 0 8 0 amappl5 112 137 0 127 1 0 1 1 0 8 0 amappl4 104 326 0 308 1 0 1 1 0 8 0 amappl3 96 3738 0 3615 4 0 4 4 0 8 0 amappl2 88 665 0 602 2 0 2 2 0 8 0 amappl1 80 9633 0 9058 14 0 14 14 0 8 0 amappl 88 5825 0 5647 5 0 5 5 0 92 1 dma32768 32768 1 0 1 1 0 1 1 0 8 1 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 27 0 1 1 0 1 1 0 8 0 uaddrrnd 24 784 0 752 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 784 0 752 1 0 1 1 0 8 0 vmmpekpl 168 8258 0 8215 3 0 3 3 0 8 0 vmmpepl 168 54495 0 52570 94 5 89 89 0 357 1 vmsppl 456 783 0 752 6 1 5 5 0 8 1 rwobjpl 64 20272 0 16644 59 0 59 59 0 8 0 pdppl 4096 1576 0 1504 106 34 72 88 0 8 0 pvpl 32 12059 0 0 99 1 98 98 0 265 0 pmappl 248 783 0 752 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 306 0 46 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff8000ffff94b8,ffff800039cde250,ffff800039cde1a0) at sys_semop+0x3ae sys/kern/sysv_sem.c:620 syscall(ffff800039cde250) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039cde250) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4e047512fb0, count: -3 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029a9bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff8394c278) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8394c278) at __mp_lock+0x199 sys/kern/kern_lock.c:144 syscall(ffff800039cc2c60) at syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039cc2c60) at syscall+0xae6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d714cb3c130, count: -6