kernel: protection fault trap, code=0 Stopped at sys_semop+0x45b: movzwl 0(%rax),%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(ffff80003c50f748,ffff80003c51e6e0,ffff80003c51e630) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80003c51e6e0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c51e6e0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9474f6dfa0, count: -3 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003c51e600 rbx 0 rdx 0 rcx 0xffff80003c50f748 rax 0xdeadbeefdeadbeef r8 0x7f7fffffc000 r9 0 r10 0x1004707dcd9d8178 r11 0xf53b797949f7bf15 r12 0xffff80000149ff04 r13 0 r14 0xffff80003c51e6e0 r15 0 rip 0xffffffff82acf90b sys_semop+0x45b cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c51e4e0 ss 0x10 sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{0}> show proc PROC (syz-executor) tid=71614 pid=53315 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=86, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c50ed08,0xffff80003c50ea88 process=0xffff80003c66d008 user=0xffff80003c519000, vmspace=0xfffffd806a5e7ad0 estcpu=36, cpticks=6, pctcpu=0.0, user=0, sys=6, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 33925 64564 41960 0 7 0 syz-executor 33925 160050 41960 0 2 0x4000000 syz-executor 53315 517110 87725 0 2 0 syz-executor *53315 71614 87725 0 7 0x4000000 syz-executor 53315 276002 87725 0 3 0x4000080 fsleep syz-executor 43188 229412 44464 0 2 0 syz-executor 43188 237331 44464 0 2 0x4000000 syz-executor 69226 259875 70276 0 2 0 syz-executor 69226 345714 70276 0 3 0x4000080 sbwait syz-executor 69226 309133 70276 0 2 0x4000000 syz-executor 5511 519377 4639 0 3 0x80 nanoslp syz-executor 5511 121181 4639 0 3 0x4000080 nanoslp syz-executor 15661 354881 33620 0 3 0x80 nanoslp syz-executor 15661 462215 33620 0 3 0x4000080 netcon syz-executor 15661 308714 33620 0 3 0x4000080 fsleep syz-executor 84759 416345 99683 0 3 0x90 nanoslp syz-executor 84759 300356 99683 0 3 0x4000090 kqsel syz-executor 84759 45697 99683 0 3 0x4000090 fsleep syz-executor 84759 494621 99683 0 3 0x4000090 fsleep syz-executor 15252 140192 0 0 3 0x14280 nfsidl nfsio 60339 246311 0 0 3 0x14280 nfsidl nfsio 20789 271637 0 0 3 0x14280 nfsidl nfsio 38652 171556 0 0 3 0x14280 nfsidl nfsio 5457 88478 0 0 3 0x14280 nfsidl nfsio 33693 212870 0 0 3 0x14280 nfsidl nfsio 37310 348817 0 0 3 0x14280 nfsidl nfsio 51361 290741 0 0 3 0x14280 nfsidl nfsio 76082 260754 0 0 3 0x14280 nfsidl nfsio 60518 358949 0 0 3 0x14280 nfsidl nfsio 85245 104454 0 0 3 0x14280 nfsidl nfsio 25661 152748 0 0 3 0x14280 nfsidl nfsio 68397 97132 0 0 3 0x14280 nfsidl nfsio 52937 183767 0 0 3 0x14280 nfsidl nfsio 48711 125487 0 0 3 0x14280 nfsidl nfsio 64839 437704 0 0 3 0x14280 nfsidl nfsio 85481 361545 0 0 3 0x14280 nfsidl nfsio 20770 126053 0 0 3 0x14280 nfsidl nfsio 65370 12771 0 0 3 0x14280 nfsidl nfsio 51736 164154 0 0 3 0x14280 nfsidl nfsio 41560 31276 1 0 3 0x100083 ttyin getty 9259 255440 0 0 3 0x14200 acct acct 36100 317303 0 0 3 0x14200 bored sosplice 33620 270871 66699 0 3 0x82 nanoslp syz-executor 99683 400164 66699 0 3 0x82 nanoslp syz-executor 87725 445072 66699 0 3 0x82 nanoslp syz-executor 40937 127848 66699 0 3 0x82 nanoslp syz-executor 4639 492710 66699 0 3 0x82 nanoslp syz-executor 70276 18256 66699 0 3 0x82 nanoslp syz-executor 41960 301827 66699 0 3 0x82 nanoslp syz-executor 44464 407719 66699 0 3 0x82 nanoslp syz-executor 66699 276151 37909 0 3 0x82 kqread syz-executor 37909 188872 51139 0 3 0x10008a sigsusp ksh 51139 365622 33768 0 3 0x98 kqread sshd-session 33768 396138 12908 0 3 0x92 kqread sshd-session 12908 169869 1 0 3 0x88 kqread sshd 74423 263963 19812 74 3 0x1100092 bpf pflogd 19812 313847 1 0 3 0x80 sbwait pflogd 83045 29591 96092 73 3 0x1100090 kqread syslogd 96092 482542 1 0 3 0x100082 sbwait syslogd 21251 149742 1 0 3 0x100080 kqread resolvd 64274 269417 80776 77 3 0x100092 kqread dhcpleased 88749 238033 80776 77 3 0x100092 kqread dhcpleased 80776 180380 1 0 3 0x80 kqread dhcpleased 11739 353196 0 0 3 0x14200 bored smr 79609 393073 0 0 2 0x14200 zerothread 59497 44484 0 0 3 0x14200 aiodoned aiodoned 74914 424585 0 0 3 0x14200 syncer update 9637 139689 0 0 3 0x14200 cleaner cleaner 36855 499270 0 0 3 0x14200 reaper reaper 85801 449988 0 0 3 0x14200 pgdaemon pagedaemon 36878 497815 0 0 3 0x14200 bored viomb 61863 112435 0 0 3 0x40014200 acpi0 acpi0 83891 254155 0 0 3 0x40014200 idle1 7153 200231 0 0 3 0x14200 bored softnet3 40587 21270 0 0 3 0x14200 bored softnet2 84532 415304 0 0 3 0x14200 bored softnet1 90452 137619 0 0 3 0x14200 bored softnet0 95164 353954 0 0 3 0x14200 bored systqmp 85257 127972 0 0 3 0x14200 bored systq 68004 57088 0 0 3 0x14200 tmoslp softclockmp 90633 60369 0 0 3 0x40014200 tmoslp softclock 70123 66521 0 0 3 0x40014200 idle0 1 108331 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 53315 (syz-executor) thread 0xffff80003c50f748 (71614) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8389bca0) #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 69226 (syz-executor) thread 0xffff80003c50f228 (309133) exclusive rwlock vmmaplk r = 0 (0xfffffd806e0289f8) #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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5250 #3 uvmfault_lookup+0xe8 sys/uvm/uvm_fault.c:1858 #4 uvm_fault_check+0x987 uvmfault_amapcopy sys/uvm/uvm_fault.c:235 [inline] #4 uvm_fault_check+0x987 sys/uvm/uvm_fault.c:774 #5 uvm_fault+0x106 sys/uvm/uvm_fault.c:668 #6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #7 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #8 recall_trap+0x8 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10201 11034K 11562K 166960K 12040 0 pcb 19 15K 17K 166960K 175 0 rtable 182 6K 7K 166960K 460 0 pf 37 18K 26K 166960K 70 0 ifaddr 40 6K 7K 166960K 61 0 ifgroup 59 2K 2K 166960K 83 0 sysctl 4 1K 1K 166960K 4 0 counters 66 36K 37K 166960K 88 0 ioctlops 0 0K 4K 166960K 1532 0 iov 0 0K 16K 166960K 32 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1432 90K 90K 166960K 1958 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 15 5K 6K 166960K 25 0 dirhash 12 2K 2K 166960K 33 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 601 0 sigio 0 0K 0K 166960K 14 0 proc 72 91K 152K 166960K 594 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 40 0 in_multi 87 6K 7K 166960K 116 0 ether_multi 1 0K 0K 166960K 3 0 mrt 1 0K 0K 166960K 1 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 512 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 246 73K 86K 166960K 7143 0 UVM aobj 22 2K 2K 166960K 23 0 pinsyscall 43 86K 104K 166960K 1675 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 19 0 NDP 13 0K 1K 166960K 38 0 temp 49 8637K 8701K 166960K 14054 0 kqueue 13 20K 28K 166960K 81 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 62 0 59 1 0 1 1 0 8 0 rtentry 168 119 0 38 5 0 5 5 0 8 0 unpcb 144 458 0 372 7 3 4 4 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 808 142 0 137 5 3 2 4 0 8 1 arp 120 20 0 4 1 0 1 1 0 8 0 inpcb 376 652 0 641 15 7 8 8 0 8 6 nd6 136 24 0 5 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 9 0 9 1 0 1 1 0 8 1 pppxif 1472 1 0 1 1 1 0 1 0 8 0 pffrag 232 5 0 0 1 0 1 1 0 482 0 pffrnode 88 5 0 0 1 0 1 1 0 8 0 pffrent 40 5 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 65 0 13 1 0 1 1 0 8 0 pfstkey 128 69 0 17 2 0 2 2 0 8 0 pfstate 376 66 0 15 6 0 6 6 0 8 0 pfrule 1344 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 256 526 0 122 30 4 26 29 0 8 0 art_table 32 527 0 122 4 0 4 4 0 8 0 art_node 16 118 0 46 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 2 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 18 0 6 1 0 1 1 0 8 0 shmpl 112 20 0 1 1 0 1 1 0 8 0 dirhash 1024 32 0 15 3 0 3 3 0 8 0 dino2pl 256 2428 0 927 95 0 95 95 0 8 0 ffsino 280 2428 0 927 109 0 109 109 0 8 0 nchpl 144 3234 0 1551 63 0 63 63 0 8 0 rtmask 32 1 0 1 1 0 1 1 0 8 1 uvmvnodes 80 2911 0 0 60 0 60 60 0 8 0 vnodes 216 2911 0 0 162 0 162 162 0 8 0 namei 1024 10854 0 10854 3 2 1 2 0 8 1 percpumem 16 58 0 11 1 0 1 1 0 8 0 kstatmem 264 44 0 18 2 0 2 2 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 3 0 3 1 1 0 1 0 8 0 scxspl 216 9935 0 9935 10 2 8 8 1 8 8 plimitpl 152 152 0 134 1 0 1 1 0 8 0 sigapl 424 910 0 838 10 1 9 9 0 8 0 futexpl 64 7422 0 7418 1 0 1 1 0 8 0 knotepl 120 321 0 0 10 0 10 10 0 8 0 kqueuepl 216 189 0 179 3 2 1 3 0 8 0 pipepl 328 192 0 165 6 0 6 6 0 8 3 fdescpl 504 870 0 838 5 0 5 5 0 8 0 filepl 152 4972 0 4684 20 2 18 18 0 8 6 lockfpl 104 104 0 102 1 0 1 1 0 8 0 lockfspl 48 48 0 46 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 36 0 19 1 0 1 1 0 8 0 ucredpl 104 748 0 734 1 0 1 1 0 8 0 zombiepl 144 909 0 908 2 1 1 1 0 8 0 processpl 1168 910 0 838 7 1 6 6 0 8 0 procpl 656 1702 0 1617 8 0 8 8 0 8 0 srpgc 96 2 0 2 1 1 0 1 0 8 0 sockpl 688 1179 0 1079 20 9 11 13 0 8 1 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 111 0 0 14 0 14 14 0 8 0 mcl2k 2048 55 0 0 7 0 7 7 0 8 0 mtagpl 96 171 0 0 5 0 5 5 0 8 0 mbufpl 256 337 0 0 22 0 22 22 0 8 0 bufpl 280 2940 0 132 201 0 201 201 0 8 0 anonpl 24 139919 0 136222 36 7 29 29 0 184 5 amapchunkpl 152 23278 0 22711 33 6 27 27 0 158 1 amappl16 200 2627 0 2591 7 4 3 6 0 8 0 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 116 0 104 1 0 1 1 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 1602 0 1570 3 1 2 2 0 8 0 amappl11 160 48 0 34 1 0 1 1 0 8 0 amappl10 152 2 0 1 1 0 1 1 0 8 0 amappl9 144 251 0 250 1 0 1 1 0 8 0 amappl8 136 117 0 114 1 0 1 1 0 8 0 amappl7 128 128 0 116 1 0 1 1 0 8 0 amappl6 120 185 0 181 1 0 1 1 0 8 0 amappl5 112 126 0 116 1 0 1 1 0 8 0 amappl4 104 317 0 298 1 0 1 1 0 8 0 amappl3 96 4365 0 4237 4 0 4 4 0 8 0 amappl2 88 650 0 588 2 0 2 2 0 8 0 amappl1 80 9314 0 8746 14 0 14 14 0 8 0 amappl 88 6740 0 6550 5 0 5 5 0 92 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 9 0 9 2 1 1 1 0 8 1 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 22 0 1 1 0 1 1 0 8 0 uaddrrnd 24 870 0 838 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 870 0 838 1 0 1 1 0 8 0 vmmpekpl 168 8845 0 8807 3 0 3 3 0 8 0 vmmpepl 168 58676 0 56736 89 3 86 87 0 357 1 vmsppl 456 869 0 838 5 1 4 5 0 8 0 rwobjpl 64 21132 0 17238 64 1 63 63 0 8 0 pdppl 4096 1747 0 1676 99 28 71 85 0 8 0 pvpl 32 11971 0 0 98 1 97 97 0 265 0 pmappl 248 869 0 838 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 298 0 41 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff80003c50f748,ffff80003c51e6e0,ffff80003c51e630) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80003c51e6e0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c51e6e0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9474f6dfa0, count: -3 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029aabff0) 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 end of kernel end trace frame: 0x7c473c213d10, count: -3