kernel: protection fault trap, code=0 Stopped at sys_msgrcv+0x3f2: movq 0x10(%r13),%rdi 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_msgrcv(ffff80003c044a70,ffff80003c463da0,ffff80003c463cf0) at sys_msgrcv+0x3f2 msg_copyout sys/kern/sysv_msg.c:639 [inline] sys_msgrcv(ffff80003c044a70,ffff80003c463da0,ffff80003c463cf0) at sys_msgrcv+0x3f2 sys/kern/sysv_msg.c:349 syscall(ffff80003c463da0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c463da0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf085d580010, count: -3 ddb{0}> show registers rdi 0 rsi 0x200000001188 rbp 0xffff80003c463cc0 rbx 0 rdx 0 rcx 0xffff80003c044a70 rax 0xa8 r8 0x7f7fffffc000 r9 0x1 r10 0x9d497842348aefdf r11 0x5f2c17ab7e4a6ee0 r12 0xfffffd806ba05f50 r13 0xdeafbeaddeafbead r14 0xffff80000141c800 r15 0 rip 0xffffffff823eade2 sys_msgrcv+0x3f2 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff80003c463c20 ss 0x10 sys_msgrcv+0x3f2: movq 0x10(%r13),%rdi ddb{0}> show proc PROC (syz-executor) tid=390912 pid=38872 tcnt=4 stat=onproc flags process=10 proc=4000000 runpri=36, usrpri=50, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c0454b0,0xffff80003c045750 process=0xffff80003c035d70 user=0xffff80003c45e000, vmspace=0xfffffd806baf9400 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 38872 305096 53355 32767 2 0x10 syz-executor 38872 160892 53355 32767 3 0x4000090 fsleep syz-executor *38872 390912 53355 32767 7 0x4000010 syz-executor 38872 140074 53355 32767 3 0x4000090 fsleep syz-executor 36290 188017 57464 0 7 0x2 syz-executor 98745 485824 11776 32767 3 0x90 nanoslp syz-executor 98745 14869 11776 32767 3 0x4000090 fsleep syz-executor 98745 307200 11776 32767 3 0x4000090 fsleep syz-executor 98745 486014 11776 32767 3 0x4000090 fsleep syz-executor 94745 151713 86285 32767 3 0x90 nanoslp syz-executor 94745 450710 86285 32767 3 0x4000090 lockf syz-executor 94745 408093 86285 32767 3 0x4000090 lockf syz-executor 94745 21672 86285 32767 3 0x4000090 fsleep syz-executor 29392 176963 13835 32767 3 0x90 nanoslp syz-executor 29392 248240 13835 32767 3 0x4000090 msgwait syz-executor 29392 433281 13835 32767 3 0x4000090 fsleep syz-executor 57614 163558 54202 32767 3 0x90 nanoslp syz-executor 57614 9862 54202 32767 3 0x4000090 kqread syz-executor 57614 366721 54202 32767 3 0x4000090 fsleep syz-executor 58865 471848 0 0 3 0x14200 bored sosplice 11776 45624 91351 32767 3 0x90 nanoslp syz-executor 54202 302409 72792 32767 3 0x90 nanoslp syz-executor 13835 33768 98041 32767 3 0x90 nanoslp syz-executor 740 387755 84087 32767 3 0x90 nanoslp syz-executor 86285 16440 25467 32767 3 0x90 nanoslp syz-executor 53355 7260 27032 32767 3 0x90 nanoslp syz-executor 84087 230263 57464 0 3 0x82 wait syz-executor 72792 500335 57464 0 3 0x82 wait syz-executor 25467 370847 57464 0 3 0x82 wait syz-executor 27032 26445 57464 0 3 0x82 wait syz-executor 91351 523475 57464 0 3 0x82 wait syz-executor 98041 370694 57464 0 3 0x82 wait syz-executor 57464 30197 78882 0 3 0x82 nanoslp syz-executor 78882 365982 75391 0 3 0x10008a sigsusp ksh 75391 406375 75180 0 3 0x98 kqread sshd-session 75180 403075 86083 0 3 0x92 kqread sshd-session 31834 471482 1 0 3 0x100083 ttyin getty 86083 277818 1 0 3 0x88 kqread sshd 6605 49124 95107 73 3 0x1100090 kqread syslogd 95107 417555 1 0 3 0x100082 sbwait syslogd 35394 358744 1 0 3 0x100080 kqread resolvd 51452 212264 34848 77 3 0x100092 kqread dhcpleased 78961 285635 34848 77 3 0x100092 kqread dhcpleased 34848 508076 1 0 3 0x80 kqread dhcpleased 80801 520236 0 0 3 0x14200 bored smr 23915 91800 0 0 2 0x14200 zerothread 18730 521122 0 0 3 0x14200 aiodoned aiodoned 73808 367600 0 0 3 0x14200 syncer update 41881 181703 0 0 3 0x14200 cleaner cleaner 8816 216722 0 0 3 0x14200 reaper reaper 29079 411117 0 0 3 0x14200 pgdaemon pagedaemon 66896 358130 0 0 3 0x14200 bored viomb 25907 105488 0 0 3 0x40014200 acpi0 acpi0 60453 483897 0 0 3 0x40014200 idle1 36583 225101 0 0 3 0x14200 bored softnet7 33544 254378 0 0 3 0x14200 bored softnet6 87827 112350 0 0 3 0x14200 bored softnet5 11532 117243 0 0 3 0x14200 bored softnet4 78594 149604 0 0 3 0x14200 bored softnet3 16253 370607 0 0 3 0x14200 bored softnet2 3277 164464 0 0 3 0x14200 bored softnet1 47773 419839 0 0 3 0x14200 bored softnet0 89145 502596 0 0 3 0x14200 bored systqmp 1828 520847 0 0 3 0x14200 bored systq 91787 310062 0 0 3 0x14200 tmoslp softclockmp 39128 424312 0 0 3 0x40014200 tmoslp softclock 75417 249794 0 0 3 0x40014200 idle0 1 32799 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 38872 (syz-executor) thread 0xffff80003c044a70 (390912) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83922170) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 sleep_finish+0x2da sys/kern/kern_synch.c:366 #3 rw_do_enter_read+0x30c sys/kern/kern_rwlock.c:392 #4 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1924 #5 uvm_fault_check+0x4a sys/uvm/uvm_fault.c:741 #6 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #7 kpageflttrap+0x2d0 sys/arch/amd64/amd64/trap.c:283 #8 kerntrap+0x13c sys/arch/amd64/amd64/trap.c:491 #9 alltraps_kern_meltdown+0x7b #10 copyout+0x57 #11 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xb08 sys/arch/amd64/amd64/trap.c:748 #12 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10195 10953K 10968K 166960K 11279 0 pcb 17 12K 12K 166960K 17 0 rtable 175 5K 6K 166960K 264 0 pf 27 16K 16K 166960K 31 0 ifaddr 34 6K 7K 166960K 44 0 ifgroup 42 1K 2K 166960K 50 0 sysctl 1 1K 9K 166960K 5 0 counters 64 36K 36K 166960K 68 0 ioctlops 0 0K 2K 166960K 31 0 iov 0 0K 12K 166960K 8 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1335 84K 84K 166960K 1464 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 16 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 21 77K 121K 166960K 307 0 sigio 0 0K 0K 166960K 3 0 proc 58 99K 147K 166960K 498 0 subproc 63 3K 4K 166960K 180 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 21 0 in_multi 77 5K 7K 166960K 105 0 ether_multi 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 361 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 152K 169K 166960K 3995 0 UVM aobj 6 2K 2K 166960K 8 0 pinsyscall 42 84K 112K 166960K 1317 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 16 0 NDP 9 0K 1K 166960K 27 0 temp 33 8670K 8734K 166960K 4430 0 kqueue 17 28K 28K 166960K 43 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 43 0 40 1 0 1 1 0 8 0 rtentry 176 100 0 21 5 0 5 5 0 8 0 unpcb 144 104 0 86 1 0 1 1 0 8 0 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpcb 736 62 0 54 1 0 1 1 0 8 0 arp 128 12 0 3 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 2 0 0 1 0 1 1 0 8 0 inpcb 328 301 0 285 11 1 10 11 0 8 8 nd6 144 19 0 5 1 0 1 1 0 8 0 kcovpl 48 20 0 13 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 464 0 87 29 0 29 29 0 8 3 art_table 40 465 0 87 5 0 5 5 0 8 0 art_node 32 100 0 29 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 4 1 0 1 1 0 8 1 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 14 0 4 1 0 1 1 0 8 0 shmpl 112 5 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1721 0 200 96 0 96 96 0 8 0 ffsino 296 1721 0 200 117 0 117 117 0 8 0 nchpl 144 2080 0 389 63 0 63 63 0 8 0 uvmvnodes 80 1910 0 0 39 0 39 39 0 8 0 vnodes 216 1910 0 0 107 0 107 107 0 8 0 namei 1024 6539 0 6539 1 0 1 1 0 8 1 percpumem 16 49 0 2 1 0 1 1 0 8 0 kstatmem 264 24 0 4 2 0 2 2 0 8 0 scxspl 216 7326 0 7326 3 2 1 2 1 8 1 plimitpl 152 93 0 72 2 0 2 2 0 8 1 sigapl 424 562 0 506 8 0 8 8 0 8 0 knotepl 120 291 0 0 9 0 9 9 0 8 0 kqueuepl 224 51 0 36 1 0 1 1 0 8 0 pipepl 344 143 0 116 4 0 4 4 0 8 1 fdescpl 528 539 0 506 3 0 3 3 0 8 0 filepl 160 2380 0 2171 18 0 18 18 0 8 7 lockfpl 104 37 0 31 1 0 1 1 0 8 0 lockfspl 48 17 0 13 1 0 1 1 0 8 0 sessionpl 144 35 0 21 1 0 1 1 0 8 0 pgrppl 48 62 0 41 1 0 1 1 0 8 0 ucredpl 104 226 0 209 1 0 1 1 0 8 0 zombiepl 144 507 0 506 1 0 1 1 0 8 0 processpl 1248 562 0 506 7 1 6 6 0 8 0 procpl 656 777 0 708 7 0 7 7 0 8 1 sockpl 752 450 0 413 16 4 12 16 0 8 8 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 18 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 265 0 0 17 0 17 17 0 8 0 bufpl 280 2969 0 116 204 0 204 204 0 8 0 anonpl 32 13384 0 0 108 0 108 108 0 246 0 amapchunkpl 152 12148 0 11602 32 3 29 29 0 158 6 amappl16 200 2102 0 2081 25 14 11 25 0 8 8 amappl15 192 7 0 6 1 0 1 1 0 8 0 amappl14 184 105 0 95 1 0 1 1 0 8 0 amappl13 176 2 0 2 1 1 0 1 0 8 0 amappl12 168 1132 0 1099 2 0 2 2 0 8 0 amappl11 160 42 0 32 1 0 1 1 0 8 0 amappl10 152 4 0 4 1 1 0 1 0 8 0 amappl9 144 275 0 275 1 1 0 1 0 8 0 amappl8 136 23 0 22 1 0 1 1 0 8 0 amappl7 128 99 0 89 1 0 1 1 0 8 0 amappl6 120 170 0 167 1 0 1 1 0 8 0 amappl5 112 123 0 117 1 0 1 1 0 8 0 amappl4 104 269 0 254 1 0 1 1 0 8 0 amappl3 96 2032 0 1908 4 0 4 4 0 8 0 amappl2 88 619 0 564 2 0 2 2 0 8 0 amappl1 80 9147 0 8582 14 0 14 14 0 8 0 amappl 88 3335 0 3151 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 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 7 0 2 1 0 1 1 0 8 0 uaddrrnd 24 539 0 506 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 539 0 506 1 0 1 1 0 8 0 vmmpekpl 168 6275 0 6230 3 0 3 3 0 8 0 vmmpepl 168 41213 0 39232 112 0 112 112 0 357 15 vmsppl 488 538 0 506 7 1 6 6 0 8 0 rwobjpl 80 15983 0 13228 61 0 61 61 0 8 4 pdppl 4096 1085 0 1012 105 22 83 95 0 8 10 pvpl 32 20681 0 0 167 0 167 167 0 265 0 pmappl 256 538 0 506 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 280 0 25 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_msgrcv(ffff80003c044a70,ffff80003c463da0,ffff80003c463cf0) at sys_msgrcv+0x3f2 msg_copyout sys/kern/sysv_msg.c:639 [inline] sys_msgrcv(ffff80003c044a70,ffff80003c463da0,ffff80003c463cf0) at sys_msgrcv+0x3f2 sys/kern/sysv_msg.c:349 syscall(ffff80003c463da0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c463da0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf085d580010, 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 __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(ffffffff83921f68) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83921f68) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 vn_ioctl(fffffd806c0d4de0,80044b02,ffff80003c48b320,ffff80003c044030) at vn_ioctl+0x4d sys/kern/vfs_vnops.c:514 sys_ioctl(ffff80003c044030,ffff80003c48b500,ffff80003c48b450) at sys_ioctl+0x5c3 sys/kern/sys_generic.c:-1 syscall(ffff80003c48b500) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c48b500) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e351cf506d0, count: -9