kernel: protection fault trap, code=0 Stopped at sys_semop+0x352: movzwl 0x8(%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(ffff80003c44f4f0,ffff80002a2cdbf0,ffff80002a2cdb40) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80002a2cdbf0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2cdbf0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77842cd7f90, count: -3 ddb{0}> show registers rdi 0 rsi 0x5 rbp 0xffff80002a2cdb10 rbx 0xdeafbeaddeafbed1 rdx 0 rcx 0xffff80003c44f4f0 rax 0xffffffff8379dff0 cpu_info_full_primary+0x1ff0 r8 0x7f7fffffc000 r9 0 r10 0x2d7624bd537ee47b r11 0x221fa682e62ed4ea r12 0x5 r13 0xfffffd8063a91cb0 r14 0xffff80002a2cdbf0 r15 0x5 rip 0xffffffff824235a2 sys_semop+0x352 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a2cda20 ss 0x10 sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{0}> show proc PROC (syz-executor) tid=306447 pid=26929 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=84, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800030c08a80,0xffff80003c44efd0 process=0xffff80002a2c39d8 user=0xffff80002a2c8000, vmspace=0xfffffd805e4343f8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 37281 404531 54932 0 2 0 syz-executor 37281 408512 54932 0 3 0x4000080 fsleep syz-executor 37281 45633 54932 0 2 0x4000000 syz-executor 82997 178968 92505 0 7 0 syz-executor 82997 236626 92505 0 2 0x4000000 syz-executor 12647 278605 98501 0 2 0 syz-executor 12647 311807 98501 0 3 0x4000080 fsleep syz-executor 26929 14084 31964 0 2 0 syz-executor *26929 306447 31964 0 7 0x4000000 syz-executor 26929 96133 31964 0 3 0x4000080 fsleep syz-executor 26929 316759 31964 0 3 0x4000080 fsleep syz-executor 80133 55587 24969 0 2 0 syz-executor 80133 99986 24969 0 3 0x4000080 netcon syz-executor 80133 209859 24969 0 3 0x4000080 fsleep syz-executor 17081 79152 53402 0 2 0 syz-executor 17081 144504 53402 0 2 0x4000000 syz-executor 17081 346672 53402 0 3 0x4000080 fsleep syz-executor 17081 390795 53402 0 3 0x4000080 fsleep syz-executor 65602 263152 84727 0 4 0x82000 syz-executor 65602 237645 84727 0 2 0x4082000 syz-executor 65602 379319 84727 0 3 0x4002000 suspend syz-executor 53402 501525 66389 0 2 0x3 syz-executor 98501 17826 66389 0 2 0x2 syz-executor 24969 131378 66389 0 2 0x3 syz-executor 84727 353859 66389 0 2 0x3 syz-executor 54932 73463 66389 0 3 0x82 nanoslp syz-executor 9538 268016 1 0 3 0x100083 ttyopn getty 17640 303059 0 0 3 0x14200 bored sosplice 92505 79928 66389 0 3 0x82 nanoslp syz-executor 61501 249647 66389 0 3 0x82 wait syz-executor 31964 297812 66389 0 2 0x3 syz-executor 66389 506522 51017 0 3 0x82 kqread syz-executor 51017 292774 87456 0 3 0x10008a sigsusp ksh 87456 183825 96457 0 3 0x98 kqread sshd-session 96457 227890 72087 0 3 0x92 kqread sshd-session 72087 238465 1 0 3 0x88 kqread sshd 96195 210198 94874 74 3 0x1100092 bpf pflogd 94874 253315 1 0 3 0x80 sbwait pflogd 8799 502930 13664 73 3 0x1100090 kqread syslogd 13664 426211 1 0 3 0x100082 sbwait syslogd 26298 10629 1 0 3 0x100080 kqread resolvd 78032 74845 0 0 3 0x14200 bored smr 68771 193242 0 0 3 0x14200 pgzero zerothread 22571 409340 0 0 3 0x14200 aiodoned aiodoned 42765 202914 0 0 3 0x14200 syncer update 85228 88962 0 0 3 0x14200 cleaner cleaner 85310 32156 0 0 3 0x14200 reaper reaper 20890 220527 0 0 3 0x14200 pgdaemon pagedaemon 20593 71527 0 0 3 0x14200 bored viomb 43909 75910 0 0 3 0x40014200 acpi0 acpi0 81020 8884 0 0 3 0x40014200 idle1 93003 157959 0 0 3 0x14200 bored softnet7 49118 255545 0 0 3 0x14200 bored softnet6 32638 417672 0 0 3 0x14200 bored softnet5 24175 23831 0 0 3 0x14200 bored softnet4 8954 206729 0 0 3 0x14200 bored softnet3 30575 214565 0 0 3 0x14200 bored softnet2 57598 502696 0 0 3 0x14200 bored softnet1 28984 90237 0 0 3 0x14200 bored softnet0 19531 295892 0 0 3 0x14200 bored systqmp 97626 120231 0 0 3 0x14200 bored systq 30182 404455 0 0 3 0x14200 tmoslp softclockmp 47076 78072 0 0 3 0x40014200 tmoslp softclock 18896 212799 0 0 3 0x40014200 idle0 1 490236 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 37281 (syz-executor) thread 0xffff80003c44e560 (45633) exclusive rwlock vmmaplk r = 0 (0xfffffd806ef5d6c0) #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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5168 #3 uvmfault_lookup+0xe8 sys/uvm/uvm_fault.c:1918 #4 uvm_fault_check+0x895 uvmfault_amapcopy sys/uvm/uvm_fault.c:235 [inline] #4 uvm_fault_check+0x895 sys/uvm/uvm_fault.c:784 #5 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #7 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:603 #8 recall_trap+0x8 Process 26929 (syz-executor) thread 0xffff80003c44f4f0 (306447) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83892b68) #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:746 #5 Xsyscall+0x128 Process 17081 (syz-executor) thread 0xffff80003c44e030 (144504) exclusive rwlock vmmaplk r = 0 (0xfffffd806ef5de60) #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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5168 #3 uvm_map_pageable+0x183 sys/uvm/uvm_map.c:2214 #4 sys_mlock+0x23d sys/uvm/uvm_mmap.c:849 #5 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #6 Xsyscall+0x128 Process 65602 (syz-executor) thread 0xffff80003c44ed28 (237645) exclusive rrwlock inode r = 0 (0xfffffd8076895ec8) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10233 11097K 13661K 166960K 13817 0 pcb 17 16K 18K 166960K 808 0 rtable 228 13K 13K 166960K 856 0 pf 38 18K 131089K 166960K 306 0 ifaddr 41 7K 8K 166960K 188 0 ifgroup 55 2K 2K 166960K 343 0 sysctl 4 1K 9K 166960K 30 0 counters 68 36K 38K 166960K 672 0 ioctlops 0 0K 8K 166960K 2306 0 iov 0 0K 28K 166960K 159 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1521 96K 96K 166960K 3563 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 1K 166960K 199 0 dirhash 12 2K 2K 166960K 78 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 2754 0 sigio 0 0K 0K 166960K 58 0 proc 67 83K 196K 166960K 983 0 subproc 72 4K 4K 166960K 132 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 342 0 in_multi 77 5K 7K 166960K 254 0 ether_multi 1 0K 0K 166960K 19 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 253 1129K 1129K 166960K 253 0 exec 0 0K 1K 166960K 879 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 7 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 233 151K 190K 166960K 26828 0 UVM aobj 73 5K 6K 166960K 80 0 pinsyscall 37 74K 102K 166960K 3982 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 165 0 NDP 12 0K 2K 166960K 137 0 temp 146 8657K 8913K 166960K 115337 0 kqueue 7 12K 28K 166960K 568 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 120 284 0 283 2 1 1 2 0 8 0 rtentry 176 286 0 202 5 1 4 5 0 8 0 unpcb 144 1867 0 1853 17 13 4 6 0 8 3 syncache 336 16 0 16 9 9 0 1 0 8 0 tcpqe 32 10 0 10 5 5 0 1 0 8 0 tcpcb 736 968 0 959 18 16 2 7 0 8 1 arp 136 30 0 17 1 0 1 1 0 8 0 inpcb 328 3329 0 3318 31 29 2 12 0 8 0 nd6 144 35 0 19 1 0 1 1 0 8 0 pkpcb 40 99 0 99 9 8 1 1 0 8 1 kcovpl 48 14 0 6 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 263 0 263 2 1 1 1 0 8 1 pppxif 1504 5 0 5 5 5 0 1 0 8 0 pfstscr 40 3 0 2 2 1 1 1 0 8 0 pffrag 232 14 0 13 1 0 1 1 0 482 0 pffrnode 88 11 0 10 1 0 1 1 0 8 0 pffrent 40 28 0 27 1 0 1 1 0 8 0 pfosfp 40 1429 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1429 0 714 21 0 21 21 0 8 0 pfrktable 1344 2 0 2 2 2 0 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 62 0 54 1 0 1 1 0 8 0 pfstkey 128 64 0 56 2 0 2 2 0 8 0 pfstate 384 61 0 55 5 2 3 5 0 8 0 pfrule 1344 93 0 87 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 5 0 0 5 0 5 5 0 8 0 art_heap4 256 1055 0 664 43 16 27 28 0 8 0 art_table 40 1060 0 664 5 0 5 5 0 8 0 art_node 32 218 0 149 1 0 1 1 0 8 0 semupl 112 4 0 4 3 3 0 1 0 8 0 semapl 112 192 0 183 1 0 1 1 0 8 0 shmpl 112 77 0 7 2 0 2 2 0 8 0 dirhash 1024 62 0 45 3 0 3 3 0 8 0 dino2pl 256 6679 0 5163 97 1 96 96 0 8 0 ffsino 296 6679 0 5163 118 0 118 118 0 8 0 nchpl 144 10395 0 8677 65 1 64 64 0 8 0 rtmask 32 15 0 15 7 6 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 37045 0 37045 5 4 1 2 0 8 1 percpumem 16 351 0 302 1 0 1 1 0 8 0 kstatmem 264 222 0 194 5 2 3 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 17 0 17 7 6 1 1 0 8 1 scxspl 216 68247 0 68247 15 14 1 8 1 8 1 plimitpl 152 696 0 679 1 0 1 1 0 8 0 sigapl 424 3003 0 2951 7 0 7 7 0 8 0 knotepl 120 636 0 0 17 0 17 17 0 8 0 kqueuepl 224 1480 0 1474 17 16 1 7 0 8 0 pipepl 344 522 0 495 17 14 3 13 0 8 0 fdescpl 528 2973 0 2944 3 0 3 3 0 8 0 filepl 160 21323 0 21115 41 28 13 20 0 8 0 lockfpl 104 977 0 974 1 0 1 1 0 8 0 lockfspl 48 353 0 350 1 0 1 1 0 8 0 sessionpl 144 39 0 31 1 0 1 1 0 8 0 pgrppl 48 86 0 70 1 0 1 1 0 8 0 ucredpl 104 3229 0 3219 1 0 1 1 0 8 0 zombiepl 144 4214 0 4213 2 1 1 1 0 8 0 processpl 1232 3003 0 2951 5 0 5 5 0 8 0 procpl 664 7633 0 7567 10 3 7 7 0 8 1 sosppl 168 24 0 24 7 7 0 1 0 8 0 sockpl 752 5758 0 5732 64 55 9 17 0 8 5 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 2 1 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 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 132 0 0 17 0 17 17 0 8 0 mcl2k 2048 46 0 0 6 0 6 6 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 296 0 0 15 1 14 15 0 8 0 bufpl 280 26802 0 20659 440 0 440 440 0 8 0 anonpl 32 14897 0 0 120 0 120 120 0 246 0 amapchunkpl 152 91552 0 91010 67 38 29 30 0 158 3 amappl16 200 10096 0 9852 95 78 17 32 0 8 4 amappl15 192 3 0 3 2 2 0 1 0 8 0 amappl14 184 143 0 134 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 3718 0 3689 4 2 2 3 0 8 0 amappl11 160 55 0 46 1 0 1 1 0 8 0 amappl10 152 19 0 19 1 1 0 1 0 8 0 amappl9 144 256 0 256 1 1 0 1 0 8 0 amappl8 136 22 0 19 1 0 1 1 0 8 0 amappl7 128 126 0 116 1 0 1 1 0 8 0 amappl6 120 245 0 241 1 0 1 1 0 8 0 amappl5 112 146 0 139 1 0 1 1 0 8 0 amappl4 104 350 0 331 1 0 1 1 0 8 0 amappl3 96 16467 0 16366 5 1 4 4 0 8 0 amappl2 88 3296 0 3232 2 0 2 2 0 8 0 amappl1 80 21385 0 20879 16 2 14 15 0 8 0 amappl 88 25532 0 25356 5 0 5 5 0 92 0 dma4096 4096 2 0 2 2 2 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 2 2 0 1 0 8 0 dma128 128 255 0 255 3 3 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 79 0 7 2 0 2 2 0 8 0 uaddrrnd 24 2974 0 2945 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2974 0 2945 1 0 1 1 0 8 0 vmmpekpl 168 25384 0 25327 3 0 3 3 0 8 0 vmmpepl 168 192590 0 190620 129 35 94 106 0 357 2 vmsppl 488 2973 0 2945 6 1 5 5 0 8 0 rwobjpl 80 57261 0 50235 155 8 147 151 0 8 1 pdppl 4096 5956 0 5890 126 60 66 86 0 8 0 pvpl 32 25107 0 0 203 1 202 202 0 265 0 pmappl 256 2973 0 2945 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 360 0 114 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff80003c44f4f0,ffff80002a2cdbf0,ffff80002a2cdb40) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80002a2cdbf0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2cdbf0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77842cd7f90, count: -3 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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: 0x7b4619c04ef0, count: -3