kernel: protection fault trap, code=0 Stopped at sys_semop+0x3f9: movzwl 0(%r15),%r12d 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(ffff80002a2979c0,ffff80003c4b7b10,ffff80003c4b7a60) at sys_semop+0x3f9 sys/kern/sysv_sem.c:602 syscall(ffff80003c4b7b10) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4b7b10) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa7d068d8be0, count: -3 ddb{0}> show registers rdi 0 rsi 0xfe78 __ALIGN_SIZE+0xee78 rbp 0xffff80003c4b7a30 rbx 0xffff8000014f6804 rdx 0 rcx 0xffff80002a2979c0 rax 0xffffffff83825ff0 cpu_info_full_primary+0x1ff0 r8 0x7f7fffffc000 r9 0 r10 0x10ee4b5b3b76976e r11 0x48f5e26d36b9d0eb r12 0xffff8000014f6804 r13 0xfffffe78 r14 0x4152 __ALIGN_SIZE+0x3152 r15 0xdeaf4152deaf4152 rip 0xffffffff832be569 sys_semop+0x3f9 cs 0x8 rflags 0x10286 __ALIGN_SIZE+0xf286 rsp 0xffff80003c4b7910 ss 0x10 sys_semop+0x3f9: movzwl 0(%r15),%r12d ddb{0}> show proc PROC (syz-executor) tid=159718 pid=99901 tcnt=3 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=0xffff80002a296020,0xffff80002a296f90 process=0xffff80003c41dd30 user=0xffff80003c4b2000, vmspace=0xfffffd806b5193e8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 99901 480108 49111 0 2 0 syz-executor *99901 159718 49111 0 7 0x4000000 syz-executor 99901 196496 49111 0 3 0x4000080 fsleep syz-executor 21177 484071 33904 0 3 0x80 fsleep syz-executor 21177 242913 33904 0 3 0x4000080 pipewr syz-executor 26510 31698 69873 0 3 0x80 fsleep syz-executor 26510 343770 69873 0 3 0x4000080 lockf syz-executor 10327 386586 92464 0 3 0x80 fsleep syz-executor 10327 444291 92464 0 3 0x4000080 lockf syz-executor 33152 168289 99573 0 3 0x80 fsleep syz-executor 33152 336941 99573 0 3 0x4000080 kqread syz-executor 83804 206563 33388 0 3 0x80 fsleep syz-executor 83804 364550 33388 0 3 0x4000080 pipewr syz-executor 66807 256885 0 0 3 0x14200 acct acct 92464 523283 4280 0 2 0x3 syz-executor 95622 469142 1 0 3 0x100083 ttyin getty 87608 242110 4280 0 3 0x82 wait syz-executor 94399 323334 0 0 3 0x14280 nfsidl nfsio 33817 185863 0 0 3 0x14280 nfsidl nfsio 46053 41661 0 0 3 0x14280 nfsidl nfsio 65837 300417 0 0 3 0x14280 nfsidl nfsio 61828 441010 0 0 3 0x14280 nfsidl nfsio 3579 191049 0 0 3 0x14280 nfsidl nfsio 53239 504682 0 0 3 0x14280 nfsidl nfsio 1384 17978 0 0 3 0x14280 nfsidl nfsio 63233 249142 0 0 3 0x14280 nfsidl nfsio 48577 393121 0 0 3 0x14280 nfsidl nfsio 53839 315211 0 0 3 0x14280 nfsidl nfsio 67359 336095 0 0 3 0x14280 nfsidl nfsio 87442 265853 0 0 3 0x14280 nfsidl nfsio 49506 57519 0 0 3 0x14280 nfsidl nfsio 31695 384123 0 0 3 0x14280 nfsidl nfsio 2920 107570 0 0 3 0x14280 nfsidl nfsio 96079 380734 0 0 3 0x14280 nfsidl nfsio 85389 496071 0 0 3 0x14280 nfsidl nfsio 68344 104235 0 0 3 0x14280 nfsidl nfsio 66175 51539 0 0 3 0x14280 nfsidl nfsio 91280 14253 0 0 3 0x14200 bored sosplice 99573 174431 4280 0 2 0x3 syz-executor 33388 182927 4280 0 2 0x3 syz-executor 51676 426955 4280 0 2 0x3 syz-executor 49111 377894 4280 0 3 0x82 nanoslp syz-executor 69873 409516 4280 0 2 0x3 syz-executor 33904 299932 4280 0 3 0x82 nanoslp syz-executor 4280 7084 60941 0 3 0x82 kqread syz-executor 60941 375948 38138 0 3 0x10008a sigsusp ksh 38138 443722 55143 0 3 0x98 kqread sshd-session 55143 309015 3516 0 3 0x92 kqread sshd-session 3516 252780 1 0 3 0x88 kqread sshd 4260 256419 47301 74 3 0x1100092 bpf pflogd 47301 119607 1 0 3 0x80 sbwait pflogd 74054 158052 36352 73 2 0x1100010 syslogd 36352 480118 1 0 3 0x100082 sbwait syslogd 78982 494727 1 0 3 0x100080 kqread resolvd 4809 292705 26600 77 3 0x100092 kqread dhcpleased 69455 519008 26600 77 3 0x100092 kqread dhcpleased 26600 42198 1 0 3 0x80 kqread dhcpleased 65946 366256 0 0 3 0x14200 bored smr 90517 242193 0 0 3 0x14200 pgzero zerothread 54549 5107 0 0 3 0x14200 aiodoned aiodoned 4367 319882 0 0 3 0x14200 syncer update 96095 80285 0 0 3 0x14200 cleaner cleaner 27652 224348 0 0 3 0x14200 reaper reaper 86132 499360 0 0 3 0x14200 pgdaemon pagedaemon 57086 59802 0 0 3 0x14200 bored viomb 48876 191449 0 0 3 0x40014200 acpi0 acpi0 20464 378387 0 0 7 0x40014200 idle1 19287 495452 0 0 3 0x14200 bored softnet3 75822 339029 0 0 3 0x14200 bored softnet2 62844 280182 0 0 3 0x14200 bored softnet1 12204 439229 0 0 2 0x14200 softnet0 87543 158172 0 0 3 0x14200 bored systqmp 73053 80930 0 0 3 0x14200 bored systq 64875 53426 0 0 3 0x14200 tmoslp softclockmp 61010 499135 0 0 3 0x40014200 tmoslp softclock 3741 49065 0 0 3 0x40014200 idle0 1 186528 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 99901 (syz-executor) thread 0xffff80002a2979c0 (159718) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839d8340) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 malloc+0xe5 sys/kern/kern_malloc.c:174 #3 sys_semop+0x234 sys/kern/sysv_sem.c:564 #4 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #5 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10220 11108K 13193K 166960K 14585 0 pcb 18 15K 16K 166960K 340 0 rtable 215 10K 10K 166960K 562 0 pf 40 18K 81K 166960K 175 0 ifaddr 41 7K 8K 166960K 106 0 ifgroup 63 2K 3K 166960K 180 0 sysctl 4 1K 9K 166960K 18 0 counters 70 37K 37K 166960K 194 0 ioctlops 0 0K 4K 166960K 1797 0 iov 0 0K 20K 166960K 153 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1518 95K 96K 166960K 3008 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 13K 166960K 23 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 61 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 89K 166960K 1533 0 sigio 0 0K 0K 166960K 23 0 proc 72 91K 128K 166960K 744 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 206 0 in_multi 83 6K 7K 166960K 173 0 ether_multi 1 0K 0K 166960K 15 0 mrt 3 0K 0K 166960K 21 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 662 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 252 169K 182K 166960K 15481 0 UVM aobj 28 2K 2K 166960K 28 0 pinsyscall 43 86K 103K 166960K 2696 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 72 0 NDP 13 0K 1K 166960K 71 0 temp 72 8695K 8759K 166960K 89732 0 kqueue 13 20K 32K 166960K 277 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 182 0 177 1 0 1 1 0 8 0 rtentry 176 172 0 82 6 0 6 6 0 8 0 unpcb 144 1031 0 1014 9 7 2 5 0 8 1 syncache 336 8 0 8 3 3 0 1 0 8 0 tcpqe 32 3 0 3 1 1 0 1 0 8 0 tcpcb 736 498 0 491 12 10 2 7 0 8 0 arp 128 26 0 9 1 0 1 1 0 8 0 inpcb 328 1658 0 1645 18 16 2 7 0 8 0 nd6 144 36 0 13 2 1 1 2 0 8 0 pkpcb 40 18 0 18 3 2 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 mppekey 1024 2 0 2 1 0 1 1 0 8 1 ppxss 1192 48 0 48 1 0 1 1 0 8 1 pppxif 1504 8 0 8 4 3 1 1 0 8 1 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 8 0 4 1 0 1 1 0 482 0 pffrnode 88 7 0 3 1 0 1 1 0 8 0 pffrent 40 12 0 8 1 0 1 1 0 8 0 pfosfp 40 1428 0 1428 5 5 0 5 0 8 0 pfosfpen 112 1428 0 1428 21 21 0 21 0 8 0 pfrktable 1344 6 0 4 3 2 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 3 0 3 2 2 0 1 0 8 0 pfstitem 24 104 0 56 1 0 1 1 0 8 0 pfstkey 128 111 0 63 3 0 3 3 0 8 0 pfstate 384 109 0 61 7 0 7 7 0 8 0 pfrule 1344 29 0 23 2 1 1 2 0 8 0 rttmr 136 4 0 4 3 3 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 802 0 444 35 10 25 31 0 8 0 art_table 32 805 0 444 4 0 4 4 0 8 0 art_node 16 166 0 87 1 0 1 1 0 8 0 sysvmsgpl 40 15 0 6 2 1 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 56 0 47 1 0 1 1 0 8 0 shmpl 112 25 0 0 1 0 1 1 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 4140 0 2633 95 0 95 95 0 8 0 ffsino 288 4140 0 2633 109 0 109 109 0 8 0 nchpl 144 6392 0 4688 64 0 64 64 0 8 0 rtmask 32 11 0 11 5 4 1 1 0 8 1 uvmvnodes 80 5391 0 0 111 0 111 111 0 8 0 vnodes 216 5391 0 0 300 0 300 300 0 8 0 namei 1024 21163 0 21163 3 2 1 2 0 8 1 percpumem 16 112 0 62 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 0 1 0 1 1 0 8 0 kstatmem 264 104 0 76 6 3 3 3 0 8 1 acpiwqpl 32 3 0 3 1 0 1 1 1 8 1 scsiplug 72 7 0 7 3 3 0 1 0 8 0 scxspl 216 23391 0 23391 11 10 1 8 1 8 1 plimitpl 152 168 0 151 1 0 1 1 0 8 0 sigapl 424 1860 0 1788 10 1 9 9 0 8 0 knotepl 120 584 0 0 18 0 18 18 0 8 0 kqueuepl 224 537 0 527 6 1 5 5 0 8 3 pipepl 336 230 0 201 3 0 3 3 0 8 0 fdescpl 520 1816 0 1784 3 0 3 3 0 8 0 filepl 160 11053 0 10820 21 8 13 15 0 8 3 lockfpl 104 508 0 502 2 1 1 2 0 8 0 lockfspl 48 196 0 192 1 0 1 1 0 8 0 sessionpl 144 31 0 22 1 0 1 1 0 8 0 pgrppl 48 58 0 41 1 0 1 1 0 8 0 ucredpl 104 1367 0 1353 1 0 1 1 0 8 0 zombiepl 144 2501 0 2499 2 1 1 1 0 8 0 processpl 1240 1860 0 1788 6 0 6 6 0 8 0 procpl 656 4101 0 4022 9 1 8 9 0 8 0 srpgc 96 3 0 3 2 2 0 1 0 8 0 sosppl 168 5 0 5 2 1 1 1 0 8 1 sockpl 728 2932 0 2890 21 16 5 13 0 8 0 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 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 119 0 0 15 0 15 15 0 8 0 mcl2k 2048 27 0 0 4 0 4 4 0 8 0 mtagpl 96 115 0 0 3 0 3 3 0 8 0 mbufpl 256 2468 0 0 153 0 153 153 0 8 0 bufpl 280 8454 0 2312 440 0 440 440 0 8 0 anonpl 32 13045 0 0 106 1 105 105 0 246 0 amapchunkpl 152 52707 0 52089 42 10 32 32 0 158 6 amappl16 200 5004 0 4732 55 28 27 27 0 8 0 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 128 0 116 1 0 1 1 0 8 0 amappl13 176 5 0 5 2 1 1 1 0 8 1 amappl12 168 2493 0 2461 3 1 2 2 0 8 0 amappl11 160 53 0 39 1 0 1 1 0 8 0 amappl10 152 4 0 4 2 2 0 1 0 8 0 amappl9 144 259 0 259 1 1 0 1 0 8 0 amappl8 136 24 0 20 1 0 1 1 0 8 0 amappl7 128 117 0 105 1 0 1 1 0 8 0 amappl6 120 206 0 202 1 0 1 1 0 8 0 amappl5 112 129 0 118 1 0 1 1 0 8 0 amappl4 104 349 0 328 1 0 1 1 0 8 0 amappl3 96 10750 0 10635 6 2 4 4 0 8 0 amappl2 88 710 0 647 2 0 2 2 0 8 0 amappl1 80 14947 0 14338 17 3 14 15 0 8 0 amappl 88 14507 0 14330 5 0 5 5 0 92 0 dma65536 65536 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 128 256 0 256 4 4 0 1 0 8 0 dma64 64 7 0 7 2 2 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 0 1 0 1 1 0 8 0 uaddrrnd 24 1816 0 1784 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1816 0 1784 1 0 1 1 0 8 0 vmmpekpl 168 15189 0 15133 3 0 3 3 0 8 0 vmmpepl 168 117990 0 115683 123 13 110 111 0 357 0 vmsppl 480 1815 0 1784 7 3 4 5 0 8 0 rwobjpl 72 36569 0 29960 122 1 121 121 0 8 0 pdppl 4096 3639 0 3568 111 40 71 83 0 8 0 pvpl 32 20342 0 0 168 4 164 164 0 265 0 pmappl 256 1815 0 1784 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 560 0 67 15 0 15 15 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff80002a2979c0,ffff80003c4b7b10,ffff80003c4b7a60) at sys_semop+0x3f9 sys/kern/sysv_sem.c:602 syscall(ffff80003c4b7b10) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4b7b10) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa7d068d8be0, count: -3 ddb{0}> machine ddbcpu 1