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(ffff8000371e22b8,ffff8000371dc5e0,ffff8000371dc530) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff8000371dc5e0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000371dc5e0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70bc8d7cb70, count: -3 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff8000371dc500 rbx 0 rdx 0 rcx 0xffff8000371e22b8 rax 0xdead4110dead4110 r8 0x7f7fffffc000 r9 0 r10 0xe0bf23c841f8b73c r11 0x181a093cf4d9ea87 r12 0xffff8000012f7304 r13 0 r14 0xffff8000371dc5e0 r15 0 rip 0xffffffff82af5beb sys_semop+0x45b cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000371dc3e0 ss 0x10 sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{0}> show proc PROC (syz-executor) tid=424424 pid=42778 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=0xffff8000371e2f60,0xffff8000ffff6a50 process=0xffff8000ffff3678 user=0xffff8000371d7000, vmspace=0xfffffd806bfc81e8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 42778 43195 87237 0 7 0 syz-executor *42778 424424 87237 0 7 0x4000000 syz-executor 42778 458033 87237 0 2 0x4000000 syz-executor 42778 86505 87237 0 3 0x4000080 fsleep syz-executor 31316 276378 63764 0 2 0 syz-executor 31316 94359 63764 0 3 0x4000000 futex syz-executor 64593 77472 3777 0 2 0 syz-executor 64593 425175 3777 0 3 0x4000080 fsleep syz-executor 64593 251400 3777 0 2 0x4000000 syz-executor 47714 393755 63064 0 2 0 syz-executor 47714 49375 63064 0 3 0x4000080 fsleep syz-executor 47714 145140 63064 0 3 0x4000080 fsleep syz-executor 83263 410835 56374 0 2 0 syz-executor 83263 4007 56374 0 3 0x4000080 kqread syz-executor 83263 21666 56374 0 3 0x4000080 fsleep syz-executor 33911 266304 0 0 3 0x14200 acct acct 70568 48893 94748 0 2 0 syz-executor 70568 69796 94748 0 3 0x4000080 sbwait syz-executor 69567 122894 50356 0 2 0 syz-executor 69567 347719 50356 0 2 0x4000000 syz-executor 69567 194678 50356 0 3 0x4000000 vmmaplk syz-executor 5820 397905 13232 0 2 0 syz-executor 5820 352163 13232 0 3 0x4000080 fsleep syz-executor 5820 138399 13232 0 3 0x4000080 fsleep syz-executor 88214 428933 0 0 3 0x14200 bored sosplice 3777 112932 84956 0 3 0x82 nanoslp syz-executor 50356 50692 84956 0 3 0x82 nanoslp syz-executor 63064 99252 84956 0 3 0x82 nanoslp syz-executor 56374 97183 84956 0 2 0x482 syz-executor 13232 86528 84956 0 3 0x82 nanoslp syz-executor 94748 499108 84956 0 3 0x82 nanoslp syz-executor 63764 240596 84956 0 2 0x482 syz-executor 87237 517950 84956 0 3 0x82 nanoslp syz-executor 84956 158930 93090 0 3 0x82 kqread syz-executor 93090 489439 49100 0 3 0x10008a sigsusp ksh 49100 58600 13060 0 3 0x98 kqread sshd-session 13060 120791 75134 0 3 0x92 kqread sshd-session 95279 461149 1 0 3 0x100083 ttyin getty 75134 93998 1 0 3 0x88 kqread sshd 5476 382304 81430 74 3 0x1100092 bpf pflogd 81430 489299 1 0 3 0x80 sbwait pflogd 17494 29842 77984 73 3 0x1100090 kqread syslogd 77984 402717 1 0 3 0x100082 sbwait syslogd 29187 154585 1 0 3 0x100080 kqread resolvd 47229 63569 74707 77 3 0x100092 kqread dhcpleased 14211 476131 74707 77 3 0x100092 kqread dhcpleased 74707 344169 1 0 3 0x80 kqread dhcpleased 67426 175702 0 0 3 0x14200 bored smr 64359 483951 0 0 2 0x14200 zerothread 76037 74621 0 0 3 0x14200 aiodoned aiodoned 66558 12594 0 0 3 0x14200 syncer update 75596 496402 0 0 3 0x14200 cleaner cleaner 59717 354044 0 0 3 0x14200 reaper reaper 81973 462611 0 0 3 0x14200 pgdaemon pagedaemon 2454 315453 0 0 3 0x14200 bored viomb 53730 13276 0 0 3 0x40014200 acpi0 acpi0 95595 177263 0 0 3 0x40014200 idle1 35102 334439 0 0 3 0x14200 bored softnet3 36465 323474 0 0 3 0x14200 bored softnet2 87938 14174 0 0 3 0x14200 bored softnet1 81558 190005 0 0 3 0x14200 bored softnet0 99009 6799 0 0 3 0x14200 bored systqmp 8234 216461 0 0 3 0x14200 bored systq 37417 135495 0 0 3 0x14200 tmoslp softclockmp 31070 109208 0 0 2 0x40014200 softclock 4664 522138 0 0 3 0x40014200 idle0 1 303567 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 42778 (syz-executor) thread 0xffff8000371e22b8 (424424) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8363b4e8) #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:170 #5 sys_semop+0x234 sys/kern/sysv_sem.c:564 #6 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] #6 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 42778 (syz-executor) thread 0xffff8000ffff6a40 (458033) exclusive rwlock futex r = 0 (0xffffffff834f50d0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 sys_futex+0x69 sys/kern/sys_futex.c:98 #2 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #2 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #3 Xsyscall+0x128 Process 64593 (syz-executor) thread 0xffff8000371e3470 (251400) exclusive rrwlock inode r = 0 (0xfffffd806de1a0a8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:169 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ufs_lookup+0x16bc sys/ufs/ufs/ufs_lookup.c:573 #7 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #8 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #9 namei+0x7aa sys/kern/vfs_lookup.c:250 #10 vn_open+0x13f sys/kern/vfs_vnops.c:140 #11 doopenat+0x31d sys/kern/vfs_syscalls.c:1123 #12 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] #12 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #13 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806bd49a30) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 vn_open+0x13f sys/kern/vfs_vnops.c:140 #8 doopenat+0x31d sys/kern/vfs_syscalls.c:1123 #9 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] #9 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #10 Xsyscall+0x128 Process 69567 (syz-executor) thread 0xffff8000371e27c8 (347719) exclusive rwlock vmmaplk r = 0 (0xfffffd806bfc8ba0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5255 #2 uvmfault_lookup+0xe8 sys/uvm/uvm_fault.c:1813 #3 uvm_fault_check+0x831 uvmfault_amapcopy sys/uvm/uvm_fault.c:236 [inline] #3 uvm_fault_check+0x831 sys/uvm/uvm_fault.c:712 #4 uvm_fault+0xf5 sys/uvm/uvm_fault.c:600 #5 kpageflttrap+0x2d0 sys/arch/amd64/amd64/trap.c:279 #6 kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332 #7 alltraps_kern_meltdown+0x7b #8 copyout+0x57 #9 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #9 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #10 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd80093ef058) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 sys_socketpair+0x2f5 #2 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #2 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #3 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10190 11116K 11376K 166960K 11512 0 pcb 17 12K 12K 166960K 55 0 rtable 242 6K 7K 166960K 370 0 pf 36 18K 18K 166960K 57 0 ifaddr 44 7K 7K 166960K 53 0 ifgroup 55 2K 2K 166960K 71 0 sysctl 1 0K 0K 166960K 1 0 counters 64 36K 36K 166960K 74 0 ioctlops 0 0K 4K 166960K 1495 0 iov 0 0K 12K 166960K 7 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1369 86K 87K 166960K 1596 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 7 0K 0K 166960K 9 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 93K 166960K 349 0 sigio 0 0K 0K 166960K 8 0 proc 73 103K 128K 166960K 562 0 subproc 104 6K 6K 166960K 104 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 70 0 in_multi 103 7K 7K 166960K 111 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 394 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 250 73K 74K 166960K 4856 0 UVM aobj 21 2K 2K 166960K 23 0 pinsyscall 43 86K 105K 166960K 1463 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 11 0 NDP 12 0K 2K 166960K 33 0 temp 42 6819K 6883K 166960K 12176 0 kqueue 13 20K 26K 166960K 52 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 49 0 46 1 0 1 1 0 8 0 rtentry 112 115 0 1 4 0 4 4 0 8 0 unpcb 144 238 0 214 5 3 2 4 0 8 1 syncache 336 4 0 4 2 1 1 1 0 8 1 tcpcb 808 62 0 58 1 0 1 1 0 8 0 arp 120 19 0 0 1 0 1 1 0 8 0 inpcb 336 334 0 324 4 2 2 4 0 8 1 nd6 136 26 0 0 1 0 1 1 0 8 0 pkpcb 40 65 0 65 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 2 0 2 1 1 0 1 0 8 0 pffrag 232 3 0 0 1 0 1 1 0 482 0 pffrnode 88 3 0 0 1 0 1 1 0 8 0 pffrent 40 4 0 1 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 32 0 1 1 0 1 1 0 8 0 pfstkey 128 32 0 1 2 0 2 2 0 8 0 pfstate 376 32 0 1 4 0 4 4 0 8 0 pfrule 1344 21 0 15 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 487 0 0 31 0 31 31 0 8 0 art_table 32 488 0 0 4 0 4 4 0 8 0 art_node 16 114 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 3 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 6 0 2 1 0 1 1 0 8 0 shmpl 112 20 0 2 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 1998 0 491 95 0 95 95 0 8 0 ffsino 272 1998 0 491 101 0 101 101 0 8 0 nchpl 144 2505 0 820 63 0 63 63 0 8 0 uvmvnodes 80 2202 0 0 45 0 45 45 0 8 0 vnodes 216 2202 0 0 123 0 123 123 0 8 0 namei 1024 8196 0 8195 3 2 1 2 0 8 0 percpumem 16 51 0 5 1 0 1 1 0 8 0 kstatmem 264 34 0 10 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 7396 0 7396 10 2 8 8 1 8 8 plimitpl 152 92 0 75 1 0 1 1 0 8 0 sigapl 424 662 0 610 8 2 6 7 0 8 0 futexpl 64 3560 0 3552 1 0 1 1 0 8 0 knotepl 120 558 0 0 17 0 17 17 0 8 0 kqueuepl 216 126 0 116 5 4 1 5 0 8 0 pipepl 320 132 0 105 3 0 3 3 0 8 0 fdescpl 496 642 0 610 5 0 5 5 0 8 0 filepl 152 3233 0 2981 18 4 14 18 0 8 4 lockfpl 104 199 0 197 2 0 2 2 0 8 1 lockfspl 48 32 0 30 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 36 0 19 1 0 1 1 0 8 0 ucredpl 104 527 0 514 1 0 1 1 0 8 0 zombiepl 144 658 0 658 1 0 1 1 0 8 1 processpl 1160 662 0 610 5 1 4 5 0 8 0 procpl 648 1049 0 982 7 1 6 6 0 8 0 sockpl 664 688 0 652 9 4 5 9 0 8 2 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 144 0 0 18 0 18 18 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 152 0 0 10 0 10 10 0 8 0 bufpl 280 2611 0 98 180 0 180 180 0 8 0 anonpl 24 82415 0 78947 32 4 28 29 0 185 2 amapchunkpl 152 14386 0 13841 23 0 23 23 0 158 2 amappl16 200 809 0 782 8 4 4 5 0 8 0 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 115 0 103 1 0 1 1 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 1300 0 1268 4 1 3 3 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 6 0 5 1 0 1 1 0 8 0 amappl9 144 201 0 201 1 1 0 1 0 8 0 amappl8 136 18 0 16 2 1 1 1 0 8 0 amappl7 128 105 0 93 1 0 1 1 0 8 0 amappl6 120 168 0 167 1 0 1 1 0 8 0 amappl5 112 129 0 118 1 0 1 1 0 8 0 amappl4 104 316 0 297 1 0 1 1 0 8 0 amappl3 96 2695 0 2590 3 0 3 3 0 8 0 amappl2 88 910 0 823 3 0 3 3 0 8 0 amappl1 80 8483 0 7912 15 1 14 14 0 8 1 amappl 88 4459 0 4271 5 0 5 5 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 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 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 22 0 2 1 0 1 1 0 8 0 uaddrrnd 24 642 0 610 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 642 0 610 1 0 1 1 0 8 0 vmmpekpl 168 6752 0 6718 3 0 3 3 0 8 0 vmmpepl 168 43699 0 41773 93 2 91 91 0 357 5 vmsppl 448 641 0 610 6 2 4 5 0 8 0 rwobjpl 56 15833 0 12663 45 0 45 45 0 8 0 pdppl 4096 1291 0 1220 101 30 71 85 0 8 0 pvpl 32 11178 0 0 92 1 91 91 0 265 0 pmappl 248 641 0 610 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 385 0 40 11 0 11 11 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff8000371e22b8,ffff8000371dc5e0,ffff8000371dc530) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff8000371dc5e0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000371dc5e0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70bc8d7cb70, count: -3 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff8363b2e0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8363b2e0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 syscall(ffff8000371b82d0) at syscall+0xad6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000371b82d0) at syscall+0xad6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fb0058a7db0, count: -7