kernel: protection fault trap, code=0 Stopped at sys_semop+0x3d5: 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(ffff80002a2f1cb0,ffff80002a2c2890,ffff80002a2c27e0) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80002a2c2890) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2c2890) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6eb842440f0, count: -3 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a2c27b0 rbx 0xdeadbeefdeadbeef rdx 0 rcx 0xffff80002a2f1cb0 rax 0xdeadbeefdeadbeef r8 0x7f7fffffc000 r9 0 r10 0xf699dc5d3a0c9db2 r11 0x219c295bd71c4bb2 r12 0 r13 0xfffffd806bd8c7e0 r14 0xffff80002a2c2890 r15 0 rip 0xffffffff813191e5 sys_semop+0x3d5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a2c26c0 ss 0x10 sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{0}> show proc PROC (syz-executor) tid=450784 pid=9918 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=0xffff80002a2f0028,0xffff80002a2f0568 process=0xffff8000fffec4e8 user=0xffff80002a2bd000, vmspace=0xfffffd8060269210 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 9918 64754 60741 0 7 0 syz-executor * 9918 450784 60741 0 7 0x4000000 syz-executor 9918 125294 60741 0 3 0x4000080 fsleep syz-executor 17361 429503 20184 0 3 0x80 fsleep syz-executor 17361 460120 20184 0 3 0x4000080 sbwait syz-executor 70009 33110 9620 0 3 0x80 fsleep syz-executor 70009 267807 9620 0 3 0x4000080 ttyout syz-executor 29456 424616 94241 0 3 0x80 fsleep syz-executor 29456 158060 94241 0 3 0x4000080 wsevent_read syz-executor 29456 278213 94241 0 3 0x4000080 wsevent_read syz-executor 38834 289072 65213 0 3 0x80 fsleep syz-executor 38834 193421 65213 0 3 0x4000080 piperd syz-executor 34297 496342 1 0 3 0x100083 ttyin getty 60741 48531 34482 0 3 0x82 nanoslp syz-executor 46709 33348 34482 0 3 0x82 nanoslp syz-executor 94241 214579 34482 0 3 0x82 nanoslp syz-executor 37768 401730 34482 0 3 0x82 nanoslp syz-executor 9620 276410 34482 0 3 0x82 nanoslp syz-executor 20184 329934 34482 0 3 0x82 nanoslp syz-executor 63584 165465 34482 0 2 0x2 syz-executor 65213 357993 34482 0 3 0x82 nanoslp syz-executor 34482 108927 75126 0 3 0x82 kqread syz-executor 75126 458290 80097 0 3 0x10008a sigsusp ksh 80097 445643 94690 0 3 0x98 kqread sshd-session 94690 227841 74515 0 3 0x92 kqread sshd-session 74515 177126 1 0 3 0x88 kqread sshd 67765 441712 36083 74 3 0x1100092 bpf pflogd 36083 357171 1 0 3 0x80 sbwait pflogd 33035 239928 77788 73 3 0x1100090 kqread syslogd 77788 100740 1 0 3 0x100082 sbwait syslogd 67560 100493 1 0 3 0x100080 kqread resolvd 81672 439940 63182 77 3 0x100092 kqread dhcpleased 80583 286955 63182 77 3 0x100092 kqread dhcpleased 63182 308768 1 0 3 0x80 kqread dhcpleased 87476 118520 0 0 3 0x14200 bored smr 11121 20306 0 0 3 0x14200 pgzero zerothread 397 151637 0 0 3 0x14200 aiodoned aiodoned 76842 225933 0 0 3 0x14200 syncer update 40365 58827 0 0 3 0x14200 cleaner cleaner 16479 234380 0 0 3 0x14200 reaper reaper 69373 306796 0 0 3 0x14200 pgdaemon pagedaemon 29591 396168 0 0 3 0x14200 bored viomb 91674 204048 0 0 3 0x40014200 acpi0 acpi0 16587 206662 0 0 3 0x40014200 idle1 92650 5970 0 0 3 0x14200 bored softnet1 97082 419095 0 0 3 0x14200 bored softnet0 45991 300406 0 0 3 0x14200 smrbar systqmp 72471 42617 0 0 3 0x14200 bored systq 46469 31100 0 0 3 0x14200 tmoslp softclockmp 61500 333186 0 0 3 0x40014200 tmoslp softclock 22637 482863 0 0 3 0x40014200 idle0 1 198257 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 9918 (syz-executor) thread 0xffff80002a2f1cb0 (450784) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83903108) #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 pool_get+0x27e sys/kern/subr_pool.c:591 #3 _rw_obj_alloc_flags+0x4d sys/kern/kern_rwlock.c:713 #4 amap_alloc+0xd6 sys/uvm/uvm_amap.c:-1 #5 amap_copy+0x6ac sys/uvm/uvm_amap.c:569 #6 uvm_fault_check+0x473 sys/uvm/uvm_fault.c:747 #7 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #8 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283 #9 kerntrap+0x19c sys/arch/amd64/amd64/trap.c:520 #10 alltraps_kern_meltdown+0x7b #11 _copyin+0x5b #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #13 Xsyscall+0x128 Process 17361 (syz-executor) thread 0xffff80002a2f1a18 (460120) exclusive rwlock sbufrcv r = 0 (0xffff8000015e2fd0) #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 sblock+0xb6 sys/kern/uipc_socket2.c:536 #3 soreceive+0x27d sys/kern/uipc_socket.c:878 #4 recvit+0x40b sys/kern/uipc_syscalls.c:1078 #5 sys_recvmmsg+0x410 sys/kern/uipc_syscalls.c:969 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #7 Xsyscall+0x128 Process 63584 (syz-executor) thread 0xffff8000ffffd230 (165465) exclusive rrwlock inode r = 0 (0xfffffd806dbfac50) #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+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd807604a570) #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+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 45991 (systqmp) thread 0xffff8000ffffecf8 (300406) shared rwlock systqmp r = 0 (0xffffffff83851fb8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11164 12261K 12488K 166960K 13164 0 pcb 17 13K 14K 166960K 159 0 rtable 175 7K 8K 166960K 493 0 pf 44 19K 19K 166960K 111 0 ifaddr 37 5K 7K 166960K 90 0 ifgroup 70 2K 3K 166960K 144 0 sysctl 3 1K 9K 166960K 10 0 counters 84 38K 38K 166960K 162 0 ioctlops 0 0K 8K 166960K 1791 0 iov 1 4K 24K 166960K 30 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1421 89K 90K 166960K 2041 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 9K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 11 0K 0K 166960K 14 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 676 0 sigio 0 0K 0K 166960K 7 0 proc 72 115K 180K 166960K 645 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 72 0 in_multi 57 4K 7K 166960K 135 0 ether_multi 1 0K 0K 166960K 5 0 mrt 1 0K 0K 166960K 9 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 115 519K 519K 166960K 115 0 exec 0 0K 1K 166960K 458 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 251 167K 184K 166960K 8285 0 UVM aobj 15 4K 6K 166960K 16 0 pinsyscall 42 84K 104K 166960K 1877 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 37 0 NDP 16 0K 2K 166960K 56 0 temp 53 8674K 8800K 166960K 32491 0 kqueue 13 20K 31K 166960K 138 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 120 141 0 138 3 2 1 3 0 8 0 rtentry 176 147 0 78 6 1 5 6 0 8 0 unpcb 144 417 0 398 4 3 1 4 0 8 0 syncache 336 7 0 7 3 2 1 1 0 8 1 tcpqe 32 3 0 3 2 1 1 1 0 8 1 tcpcb 736 129 0 123 1 0 1 1 0 8 0 arp 136 23 0 11 1 0 1 1 0 8 0 inpcb 328 526 0 517 4 0 4 4 0 8 2 nd6 152 29 0 16 1 0 1 1 0 8 0 pkpcb 40 3 0 3 2 2 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1192 32 0 28 2 1 1 1 0 8 0 pppxif 1504 9 0 7 3 2 1 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 10 0 4 1 0 1 1 0 482 0 pffrnode 88 10 0 4 1 0 1 1 0 8 0 pffrent 40 46 0 40 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 pfrktable 1344 1 0 1 1 1 0 1 0 8 0 pfstitem 24 56 0 26 1 0 1 1 0 8 0 pfstkey 128 59 0 29 2 0 2 2 0 8 0 pfstate 448 58 0 28 5 0 5 5 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 rttmr 136 2 0 2 2 2 0 1 0 8 0 art_heap8 4096 2 0 1 2 1 1 2 0 8 0 art_heap4 256 589 0 295 29 4 25 29 0 8 1 art_table 40 591 0 296 5 0 5 5 0 8 0 art_node 32 146 0 82 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 6 2 1 1 1 0 8 0 semapl 112 10 0 2 1 0 1 1 0 8 0 shmpl 112 11 0 0 1 0 1 1 0 8 0 dirhash 1024 25 0 8 3 0 3 3 0 8 0 dino2pl 256 2748 0 1242 96 0 96 96 0 8 0 ffsino 296 2748 0 1242 118 0 118 118 0 8 0 nchpl 144 3697 0 1993 64 0 64 64 0 8 0 rtmask 32 4 0 4 2 2 0 1 0 8 0 vnodes 216 3094 0 0 172 0 172 172 0 8 0 namei 1024 12167 0 12167 3 2 1 2 0 8 1 percpumem 16 96 0 39 1 0 1 1 0 8 0 vcpupl 3968 1 0 0 1 0 1 1 0 8 0 vmpool 848 2 0 1 2 1 1 2 0 8 0 kstatmem 264 82 0 44 3 0 3 3 0 8 0 scsiplug 72 2 0 2 2 2 0 1 0 8 0 scxspl 216 27855 0 27855 12 6 6 8 1 8 6 plimitpl 152 102 0 84 1 0 1 1 0 8 0 sigapl 424 996 0 949 7 1 6 7 0 8 0 knotepl 120 340 0 0 10 0 10 10 0 8 0 kqueuepl 224 275 0 265 6 5 1 5 0 8 0 pipepl 344 160 0 132 3 0 3 3 0 8 0 fdescpl 528 980 0 949 3 0 3 3 0 8 0 filepl 160 5458 0 5238 21 6 15 16 0 8 5 lockfpl 104 364 0 362 2 1 1 2 0 8 0 lockfspl 48 164 0 162 1 0 1 1 0 8 0 sessionpl 144 28 0 19 1 0 1 1 0 8 0 pgrppl 48 50 0 33 1 0 1 1 0 8 0 ucredpl 104 887 0 873 1 0 1 1 0 8 0 zombiepl 144 1179 0 1177 2 1 1 1 0 8 0 processpl 1232 996 0 949 5 1 4 5 0 8 0 procpl 664 1957 0 1903 6 0 6 6 0 8 0 sosppl 176 3 0 3 1 1 0 1 0 8 0 sockpl 752 1107 0 1076 10 3 7 10 0 8 3 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 124 0 0 16 0 16 16 0 8 1 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 37 0 0 5 0 5 5 0 8 0 mtagpl 96 24 0 0 1 0 1 1 0 8 0 mbufpl 256 205 0 0 13 0 13 13 0 8 0 bufpl 280 11906 0 5770 439 0 439 439 0 8 0 anonpl 32 11626 0 0 94 0 94 94 0 246 0 amapchunkpl 152 26823 0 26312 46 19 27 36 0 158 5 amappl16 200 3694 0 3656 29 14 15 27 0 8 6 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 18 0 18 1 1 0 1 0 8 0 amappl13 176 452 0 451 1 0 1 1 0 8 0 amappl12 168 1363 0 1320 3 0 3 3 0 8 0 amappl11 160 8 0 7 1 0 1 1 0 8 0 amappl10 152 54 0 40 1 0 1 1 0 8 0 amappl9 144 251 0 250 1 0 1 1 0 8 0 amappl8 136 60 0 58 1 0 1 1 0 8 0 amappl7 128 87 0 86 1 0 1 1 0 8 0 amappl6 120 301 0 288 1 0 1 1 0 8 0 amappl5 112 93 0 83 1 0 1 1 0 8 0 amappl4 104 477 0 448 1 0 1 1 0 8 0 amappl3 96 4540 0 4441 3 0 3 3 0 8 0 amappl2 88 1105 0 1029 2 0 2 2 0 8 0 amappl1 80 11756 0 11171 15 2 13 14 0 8 0 amappl 88 7404 0 7232 5 0 5 5 0 92 0 uvmvnodes 80 118 0 0 3 0 3 3 0 8 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 128 254 0 254 2 2 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 15 0 1 1 0 1 1 0 8 0 uaddrrnd 24 980 0 949 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 980 0 949 1 0 1 1 0 8 0 vmmpekpl 168 9822 0 9781 3 0 3 3 0 8 0 vmmpepl 168 69754 0 67823 107 9 98 107 0 357 5 vmsppl 488 979 0 949 6 1 5 5 0 8 0 rwobjpl 80 21722 0 20657 32 4 28 32 0 8 0 pdppl 4096 1971 0 1901 109 37 72 85 0 8 2 pvpl 32 18611 0 0 151 0 151 151 0 265 0 pmappl 256 981 0 950 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 294 0 48 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff80002a2f1cb0,ffff80002a2c2890,ffff80002a2c27e0) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80002a2c2890) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2c2890) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6eb842440f0, count: -3 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299ddff0) 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(ffffffff83902f00) at __mp_lock+0x190 __mp_lock_spin sys/kern/kern_lock.c:143 [inline] __mp_lock(ffffffff83902f00) at __mp_lock+0x190 sys/kern/kern_lock.c:173 syscall(ffff80003c413140) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c413140) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cb48d4b1840, count: -6