kernel: protection fault trap, code=0 Stopped at sys_semop+0x384: movzwl 0(%rbx),%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(ffff800038c20fb8,ffff80003ac43a50,ffff80003ac439a0) at sys_semop+0x384 sys/kern/sysv_sem.c:604 syscall(ffff80003ac43a50) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003ac43a50) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd75653ea5b0, count: -3 ddb{0}> show registers rdi 0 rsi 0xfff9 __ALIGN_SIZE+0xeff9 rbp 0xffff80003ac43970 rbx 0xdeaf4152deaf4152 rdx 0 rcx 0xffff800038c20fb8 rax 0xffffffff8378fff0 cpu_info_full_primary+0x1ff0 r8 0x7f7fffffc000 r9 0xfffffd80097fb820 r10 0x37bde28253884d03 r11 0x1c9ccacfcee6dc4 r12 0xfffffff9 r13 0xfffffd8062cefee0 r14 0xffff80003ac43a50 r15 0 rip 0xffffffff81159554 sys_semop+0x384 cs 0x8 rflags 0x10286 __ALIGN_SIZE+0xf286 rsp 0xffff80003ac43880 ss 0x10 sys_semop+0x384: movzwl 0(%rbx),%r15d ddb{0}> show proc PROC (syz-executor) tid=93729 pid=58571 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=0xffff800038c20d20,0xffff800038c21a28 process=0xffff80003a034020 user=0xffff80003ac3e000, vmspace=0xfffffd806b9ea018 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 58571 296965 65441 0 2 0 syz-executor *58571 93729 65441 0 7 0x4000000 syz-executor 58571 301448 65441 0 7 0x4000000 syz-executor 58571 358652 65441 0 3 0x4000080 fsleep syz-executor 91764 412007 56920 0 3 0x80 fsleep syz-executor 91764 169344 56920 0 3 0x4000080 pipewr syz-executor 17863 435670 41098 0 3 0x80 fsleep syz-executor 17863 88278 41098 0 3 0x4000080 pipewr syz-executor 23431 295500 34381 0 3 0x80 fsleep syz-executor 23431 442291 34381 0 3 0x4000080 kqsel syz-executor 50650 521608 5278 0 3 0x80 fsleep syz-executor 50650 214535 5278 0 3 0x4000080 pipewr syz-executor 24506 240421 13784 0 3 0x80 fsleep syz-executor 24506 519980 13784 0 3 0x4000080 kqpoll syz-executor 41098 231992 83028 0 3 0x82 nanoslp syz-executor 50759 499670 0 0 3 0x14200 bored sosplice 34381 14088 83028 0 3 0x82 nanoslp syz-executor 76601 125794 83028 0 3 0x82 wait syz-executor 65441 465872 83028 0 3 0x82 nanoslp syz-executor 5278 387946 83028 0 3 0x82 nanoslp syz-executor 56920 158535 83028 0 3 0x82 nanoslp syz-executor 13784 433436 83028 0 3 0x82 nanoslp syz-executor 67856 303886 83028 0 3 0x82 wait syz-executor 83028 510923 53867 0 3 0x82 kqread syz-executor 53867 96281 44864 0 3 0x10008a sigsusp ksh 44864 243967 52568 0 3 0x98 kqread sshd-session 52568 276486 88773 0 3 0x92 kqread sshd-session 22583 100281 1 0 3 0x100083 ttyin getty 88773 94392 1 0 3 0x88 kqread sshd 26168 382901 91707 74 3 0x1100092 bpf pflogd 91707 61547 1 0 3 0x80 sbwait pflogd 85353 482468 7078 73 3 0x1100090 kqread syslogd 7078 82980 1 0 3 0x100082 sbwait syslogd 98318 503996 1 0 3 0x100080 kqread resolvd 65855 375024 83374 77 3 0x100092 kqread dhcpleased 99732 87985 83374 77 3 0x100092 kqread dhcpleased 83374 239294 1 0 3 0x80 kqread dhcpleased 35103 372293 0 0 3 0x14200 bored smr 83411 243493 0 0 3 0x14200 pgzero zerothread 82756 350476 0 0 3 0x14200 aiodoned aiodoned 92765 132338 0 0 3 0x14200 syncer update 7872 277164 0 0 3 0x14200 cleaner cleaner 36005 152248 0 0 3 0x14200 reaper reaper 62502 37946 0 0 3 0x14200 pgdaemon pagedaemon 13743 112927 0 0 3 0x14200 bored viomb 40725 506525 0 0 3 0x40014200 acpi0 acpi0 14649 512683 0 0 3 0x40014200 idle1 67212 446472 0 0 3 0x14200 bored softnet7 1003 152140 0 0 3 0x14200 bored softnet6 35540 219661 0 0 3 0x14200 bored softnet5 91750 281044 0 0 3 0x14200 bored softnet4 13897 19019 0 0 3 0x14200 bored softnet3 3364 245449 0 0 3 0x14200 bored softnet2 15519 432274 0 0 3 0x14200 bored softnet1 44758 49071 0 0 3 0x14200 bored softnet0 19940 286342 0 0 3 0x14200 bored systqmp 11666 261745 0 0 3 0x14200 bored systq 79800 264451 0 0 3 0x14200 tmoslp softclockmp 16072 65711 0 0 3 0x40014200 tmoslp softclock 76938 180317 0 0 3 0x40014200 idle0 1 218322 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 58571 (syz-executor) thread 0xffff800038c20fb8 (93729) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8389d650) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 malloc+0xe3 sys/kern/kern_malloc.c:174 #3 sys_semop+0x22f sys/kern/sysv_sem.c:-1 #4 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #5 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10224 11045K 11328K 166960K 13343 0 pcb 17 14K 15K 166960K 419 0 rtable 194 10K 11K 166960K 507 0 pf 41 19K 82K 166960K 308 0 ifaddr 39 7K 8K 166960K 146 0 ifgroup 59 2K 3K 166960K 251 0 sysctl 4 1K 9K 166960K 20 0 counters 70 37K 38K 166960K 286 0 ioctlops 1 0K 4K 166960K 1819 0 iov 0 0K 40K 166960K 135 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1514 95K 96K 166960K 3300 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 59 0 dirhash 12 2K 2K 166960K 51 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 1804 0 sigio 0 0K 0K 166960K 32 0 proc 76 131K 163K 166960K 770 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 285 0 in_multi 73 5K 7K 166960K 191 0 ether_multi 1 0K 0K 166960K 11 0 mrt 2 0K 0K 166960K 10 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 633 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 4 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 265 178K 182K 166960K 18005 0 UVM aobj 113 5K 5K 166960K 116 0 pinsyscall 43 86K 104K 166960K 2911 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 95 0 NDP 13 0K 1K 166960K 104 0 temp 79 8652K 8724K 166960K 90931 0 kqueue 13 20K 32K 166960K 352 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 120 184 0 181 2 1 1 2 0 8 0 rtentry 176 164 0 93 5 0 5 5 0 8 0 unpcb 144 1145 0 1127 9 7 2 6 0 8 1 syncache 336 7 0 7 4 4 0 1 0 8 0 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 736 695 0 689 14 10 4 7 0 8 3 arp 128 19 0 11 1 0 1 1 0 8 0 inpcb 328 2022 0 2013 13 9 4 9 0 8 2 nd6 144 25 0 11 1 0 1 1 0 8 0 pkpcb 40 51 0 51 4 4 0 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 mppekey 1024 2 0 2 2 2 0 1 0 8 0 ppxss 1192 88 0 88 2 1 1 1 0 8 1 pppxif 1504 15 0 15 2 2 0 1 0 8 0 pfstscr 40 12 0 11 2 1 1 1 0 8 0 pffrag 232 12 0 4 1 0 1 1 0 482 0 pffrnode 88 11 0 3 1 0 1 1 0 8 0 pffrent 40 22 0 14 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 4 0 4 2 2 0 1 0 8 0 pfanchor 1288 3 0 1 1 0 1 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 139 0 44 1 0 1 1 0 8 0 pfstkey 128 149 0 51 4 0 4 4 0 8 0 pfstate 384 142 0 48 10 0 10 10 0 8 0 pfrule 1344 32 0 27 2 1 1 2 0 8 0 rttmr 136 2 0 2 2 1 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 702 0 385 30 2 28 28 0 8 0 art_table 40 704 0 385 5 0 5 5 0 8 0 art_node 32 163 0 108 1 0 1 1 0 8 0 sysvmsgpl 40 69 0 69 3 3 0 1 0 8 0 semapl 112 51 0 42 1 0 1 1 0 8 0 shmpl 112 113 0 3 4 0 4 4 0 8 0 dirhash 1024 44 0 27 3 0 3 3 0 8 0 dino2pl 256 4933 0 3432 96 1 95 96 0 8 0 ffsino 296 4933 0 3432 117 0 117 117 0 8 0 nchpl 144 7338 0 5641 64 0 64 64 0 8 0 rtmask 32 16 0 16 5 4 1 1 0 8 1 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 26660 0 26660 3 2 1 2 0 8 1 percpumem 16 158 0 108 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 1 1 1 0 1 0 8 0 kstatmem 264 172 0 142 3 0 3 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 8 0 8 4 3 1 1 0 8 1 scxspl 216 50895 0 50895 14 11 3 8 1 8 3 plimitpl 152 340 0 320 1 0 1 1 0 8 0 sigapl 424 2060 0 2005 7 0 7 7 0 8 0 knotepl 120 585 0 0 17 0 17 17 0 8 0 kqueuepl 224 898 0 887 16 15 1 11 0 8 0 pipepl 344 335 0 305 9 6 3 9 0 8 0 fdescpl 528 2034 0 2002 3 0 3 3 0 8 0 filepl 160 14106 0 13875 27 14 13 19 0 8 1 lockfpl 104 810 0 807 2 1 1 2 0 8 0 lockfspl 48 367 0 364 1 0 1 1 0 8 0 sessionpl 144 28 0 19 1 0 1 1 0 8 0 pgrppl 48 56 0 39 1 0 1 1 0 8 0 ucredpl 104 2832 0 2819 1 0 1 1 0 8 0 zombiepl 144 2943 0 2941 1 0 1 1 0 8 0 processpl 1248 2060 0 2005 5 0 5 5 0 8 0 procpl 664 4943 0 4880 7 0 7 7 0 8 0 sosppl 168 4 0 4 2 1 1 1 0 8 1 sockpl 752 3482 0 3452 25 17 8 17 0 8 4 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 117 0 0 15 0 15 15 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 42 0 0 5 0 5 5 0 8 0 mtagpl 96 14 0 0 1 0 1 1 0 8 0 mbufpl 256 1171 0 0 73 0 73 73 0 8 0 bufpl 280 22696 0 16552 440 0 440 440 0 8 0 anonpl 32 14018 0 0 113 0 113 113 0 246 0 amapchunkpl 152 60646 0 60005 41 12 29 31 0 158 1 amappl16 200 8262 0 7745 48 20 28 28 0 8 0 amappl15 192 2 0 2 1 1 0 1 0 8 0 amappl14 184 124 0 112 1 0 1 1 0 8 0 amappl13 176 5 0 5 2 2 0 1 0 8 0 amappl12 168 2716 0 2684 4 1 3 3 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 249 0 249 1 1 0 1 0 8 0 amappl8 136 24 0 21 1 0 1 1 0 8 0 amappl7 128 113 0 101 1 0 1 1 0 8 0 amappl6 120 206 0 202 1 0 1 1 0 8 0 amappl5 112 134 0 125 1 0 1 1 0 8 0 amappl4 104 309 0 291 1 0 1 1 0 8 0 amappl3 96 12447 0 12320 4 0 4 4 0 8 0 amappl2 88 707 0 640 2 0 2 2 0 8 0 amappl1 80 15763 0 15158 16 1 15 15 0 8 0 amappl 88 16938 0 16750 5 0 5 5 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 1 0 1 0 8 0 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 8 0 8 3 2 1 1 0 8 1 dma128 128 255 0 255 3 2 1 1 0 8 1 dma64 64 8 0 8 2 2 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 21 0 20 1 0 1 1 0 8 0 aobjpl 72 115 0 3 3 0 3 3 0 8 0 uaddrrnd 24 2034 0 2002 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2034 0 2002 1 0 1 1 0 8 0 vmmpekpl 168 17340 0 17288 3 0 3 3 0 8 0 vmmpepl 168 134283 0 131725 126 14 112 112 0 357 0 vmsppl 488 2033 0 2002 6 1 5 5 0 8 0 rwobjpl 80 43260 0 35771 154 1 153 153 0 8 0 pdppl 4096 4076 0 4004 108 36 72 86 0 8 0 pvpl 32 22517 0 0 181 0 181 181 0 265 0 pmappl 256 2033 0 2002 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 367 0 62 9 0 9 9 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff800038c20fb8,ffff80003ac43a50,ffff80003ac439a0) at sys_semop+0x384 sys/kern/sysv_sem.c:604 syscall(ffff80003ac43a50) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003ac43a50) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd75653ea5b0, count: -3 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299fdff0) 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 __mp_lock(ffffffff8389d448) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8389d448) at __mp_lock+0x192 sys/kern/kern_lock.c:165 vn_ioctl(fffffd8071b98790,c1084425,ffff800001519a00,ffff800038c21a18) at vn_ioctl+0x4d sys/kern/vfs_vnops.c:514 sys_ioctl(ffff800038c21a18,ffff80003c4719d0,ffff80003c471920) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff80003c4719d0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4719d0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd75079d2240, count: -8