kernel: protection fault trap, code=0 Stopped at sys_msgrcv+0x2df: movq 0x10(%r13),%rdi ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace sys_msgrcv(ffff800021214af8,ffff80002125f770,ffff80002125f7c0) at sys_msgrcv+0x2df msg_copyout sys/kern/sysv_msg.c:639 [inline] sys_msgrcv(ffff800021214af8,ffff80002125f770,ffff80002125f7c0) at sys_msgrcv+0x2df sys/kern/sysv_msg.c:349 syscall(ffff80002125f840) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002125f840) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb1e18f51950, count: -3 ddb{1}> show registers rdi 0x108 rsi 0x20002708 rbp 0xffff80002125f760 rbx 0x108 rdx 0xffff80002125a000 rcx 0 rax 0 r8 0x7f7fffffc000 r9 0x1 r10 0xa019f788cafc96b0 r11 0x1422459b5c4bf78a r12 0xfffffd806ca1af50 r13 0xdead4110dead4110 r14 0xffff800000cd1000 r15 0x108 rip 0xffffffff8125c52f sys_msgrcv+0x2df cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80002125f6d0 ss 0x10 sys_msgrcv+0x2df: movq 0x10(%r13),%rdi ddb{1}> show proc PROC (syz-executor4141097575) pid=363089 stat=onproc flags process=0 proc=4000000 pri=36, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff8000212142d0,0xffff800021215330 process=0xffff800021212e20 user=0xffff80002125a000, vmspace=0xfffffd806d5bd750 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 36694 475179 1616 0 7 0 syz-executor4141097575 *36694 363089 1616 0 7 0x4000000 syz-executor4141097575 36694 130603 1616 0 2 0x4000000 syz-executor4141097575 36694 512834 1616 0 2 0x4000000 syz-executor4141097575 36694 445912 1616 0 2 0x4000000 syz-executor4141097575 1616 269598 16282 0 3 0x82 nanoslp syz-executor4141097575 16282 238436 94750 0 3 0x10008a sigsusp ksh 94750 502203 13434 0 3 0x9a kqread sshd 37412 480183 1 0 3 0x100083 ttyin getty 13434 203926 1 0 3 0x88 kqread sshd 1399 349570 57915 74 3 0x1100092 bpf pflogd 57915 244289 1 0 3 0x80 netio pflogd 15417 123461 61370 73 3 0x1100090 kqread syslogd 61370 254664 1 0 3 0x100082 netio syslogd 38042 173365 1 0 3 0x100080 kqread resolvd 91430 419398 77478 77 3 0x100092 kqread dhcpleased 28336 297370 77478 77 3 0x100092 kqread dhcpleased 77478 60613 1 0 3 0x80 kqread dhcpleased 44488 76558 0 0 3 0x14200 bored smr 57210 254592 0 0 2 0x14200 zerothread 8222 247921 0 0 3 0x14200 aiodoned aiodoned 49655 293843 0 0 3 0x14200 syncer update 86040 444243 0 0 3 0x14200 cleaner cleaner 56640 312969 0 0 3 0x14200 reaper reaper 3946 9699 0 0 3 0x14200 pgdaemon pagedaemon 68580 10991 0 0 3 0x14200 bored viomb 40875 472465 0 0 3 0x40014200 acpi0 acpi0 71720 449863 0 0 3 0x40014200 idle1 62947 198893 0 0 3 0x14200 bored softnet3 1983 67356 0 0 3 0x14200 bored softnet2 79467 303384 0 0 3 0x14200 bored softnet1 4728 436436 0 0 3 0x14200 bored softnet0 59688 221975 0 0 3 0x14200 bored systqmp 71398 141216 0 0 3 0x14200 bored systq 87014 235858 0 0 3 0x40014200 bored softclock 70124 183544 0 0 3 0x40014200 idle0 1 391028 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 36694 (syz-executor4141097575) thread 0xffff800021214af8 (363089) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82cb5fd8) #0 witness_lock+0x447 #1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 #2 mi_switch+0x4c6 sys/kern/sched_bsd.c:470 #3 sleep_finish+0x19b sys/kern/kern_synch.c:414 #4 rw_enter+0x341 sys/kern/kern_rwlock.c:285 #5 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1773 #6 uvm_fault_check+0x3e sys/uvm/uvm_fault.c:673 #7 uvm_fault+0xf2 sys/uvm/uvm_fault.c:601 #8 kpageflttrap+0x252 sys/arch/amd64/amd64/trap.c:279 #9 kerntrap+0xf3 sys/arch/amd64/amd64/trap.c:332 #10 alltraps_kern_meltdown+0x7b #11 copyout+0x57 #12 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #12 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 #13 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10162 6455K 6456K 78643K 11240 0 pcb 13 8K 8K 78643K 13 0 rtable 58 1K 2K 78643K 114 0 pf 15 6K 10K 78643K 26 0 ifaddr 13 9K 9K 78643K 13 0 ifgroup 22 1K 1K 78643K 22 0 counters 44 33K 33K 78643K 44 0 ioctlops 0 0K 4K 78643K 1475 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1176 74K 74K 78643K 1192 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 5 0K 0K 78643K 5 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 1 0K 0K 78643K 1 0 proc 67 91K 91K 78643K 302 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 25 122K 122K 78643K 25 0 exec 0 0K 1K 78643K 269 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 112 12K 12K 78643K 2568 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 4 0K 0K 78643K 4 0 temp 4 5904K 5968K 78643K 3104 0 kqueue 11 16K 18K 78643K 24 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 20 0 17 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 144 35 0 20 1 0 1 1 0 8 0 syncache 296 5 0 5 1 0 1 1 0 8 1 tcpqe 32 129 0 129 1 1 0 1 0 8 0 tcpcb 808 8 0 5 1 0 1 1 0 8 0 arp 120 2 0 0 1 0 1 1 0 8 0 inpcb 368 33 0 27 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 9 0 0 1 0 1 1 0 8 0 pfstkey 128 9 0 0 1 0 1 1 0 8 0 pfstate 376 9 0 0 1 0 1 1 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 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 6 1 0 1 1 0 8 1 semapl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1436 0 40 88 0 88 88 0 8 0 ffsino 272 1436 0 40 94 0 94 94 0 8 0 nchpl 144 1625 0 54 59 0 59 59 0 8 0 uvmvnodes 80 1450 0 0 30 0 30 30 0 8 0 vnodes 216 1450 0 0 81 0 81 81 0 8 0 namei 1024 4573 0 4573 1 0 1 1 0 8 1 percpumem 16 35 0 0 1 0 1 1 0 8 0 kstatmem 264 8 0 0 1 0 1 1 0 8 0 scxspl 216 4880 0 4880 3 2 1 2 1 8 1 plimitpl 152 18 0 10 1 0 1 1 0 8 0 sigapl 424 340 0 307 5 1 4 5 0 8 0 futexpl 64 12 0 12 1 0 1 1 0 8 1 knotepl 120 45 0 0 2 0 2 2 0 8 0 kqueuepl 216 20 0 13 1 0 1 1 0 8 0 pipepl 320 94 0 91 1 0 1 1 0 8 0 fdescpl 496 323 0 307 3 0 3 3 0 8 0 filepl 152 1277 0 1219 3 0 3 3 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 18 0 9 1 0 1 1 0 8 0 pgrppl 48 18 0 9 1 0 1 1 0 8 0 ucredpl 104 71 0 59 1 0 1 1 0 8 0 zombiepl 144 307 0 307 1 0 1 1 0 8 1 processpl 1072 340 0 307 3 0 3 3 0 8 0 procpl 696 352 0 315 4 0 4 4 0 8 0 sockpl 488 88 0 64 4 0 4 4 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 310 0 0 39 0 39 39 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 322 0 0 21 0 21 21 0 8 0 bufpl 288 2572 0 86 178 0 178 178 0 8 0 anonpl 24 169428 0 167361 24 4 20 24 0 186 7 amapchunkpl 152 8572 0 8393 8 1 7 8 0 158 0 amappl16 200 4714 0 4712 5 4 1 5 0 8 0 amappl15 192 11 0 11 1 1 0 1 0 8 0 amappl14 184 113 0 102 1 0 1 1 0 8 0 amappl13 176 11 0 11 1 1 0 1 0 8 0 amappl12 168 873 0 857 2 1 1 2 0 8 0 amappl11 160 55 0 41 1 0 1 1 0 8 0 amappl10 152 12 0 11 1 0 1 1 0 8 0 amappl9 144 161 0 161 1 1 0 1 0 8 0 amappl8 136 48 0 46 1 0 1 1 0 8 0 amappl7 128 23 0 20 1 0 1 1 0 8 0 amappl6 120 153 0 138 1 0 1 1 0 8 0 amappl5 112 129 0 118 1 0 1 1 0 8 0 amappl4 104 488 0 456 1 0 1 1 0 8 0 amappl3 96 2515 0 2476 2 1 1 2 0 8 0 amappl2 88 500 0 452 2 0 2 2 0 8 0 amappl1 80 9445 0 8969 12 0 12 12 0 8 0 amappl 88 2259 0 2194 2 0 2 2 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 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 323 0 307 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 323 0 307 1 0 1 1 0 8 0 vmmpekpl 168 7209 0 7190 1 0 1 1 0 8 0 vmmpepl 168 35706 0 34617 52 1 51 52 0 357 0 vmsppl 464 322 0 307 3 0 3 3 0 8 0 rwobjpl 56 18879 0 16718 33 2 31 33 0 8 0 pdppl 4096 654 0 614 54 14 40 46 0 8 0 pvpl 32 272658 0 267752 57 4 53 57 0 265 10 pmappl 248 322 0 307 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 492 0 16 14 0 14 14 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82c01ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82cb5dd0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cb5dd0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x52 sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x72192c862ed0, count: -6 ddb{0}> machine ddbcpu 1 Stopped at sys_msgrcv+0x2df: movq 0x10(%r13),%rdi ddb{1}> trace sys_msgrcv(ffff800021214af8,ffff80002125f770,ffff80002125f7c0) at sys_msgrcv+0x2df msg_copyout sys/kern/sysv_msg.c:639 [inline] sys_msgrcv(ffff800021214af8,ffff80002125f770,ffff80002125f7c0) at sys_msgrcv+0x2df sys/kern/sysv_msg.c:349 syscall(ffff80002125f840) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002125f840) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb1e18f51950, count: -3 ddb{1}>