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(ffff80002a2962b0,ffff80003c4d5500,ffff80003c4d5450) at sys_msgrcv+0x3f2 msg_copyout sys/kern/sysv_msg.c:639 [inline] sys_msgrcv(ffff80002a2962b0,ffff80003c4d5500,ffff80003c4d5450) at sys_msgrcv+0x3f2 sys/kern/sysv_msg.c:349 syscall(ffff80003c4d5500) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4d5500) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70291f2b9b0, count: -3 ddb{0}> show registers rdi 0 rsi 0x200000001608 rbp 0xffff80003c4d5420 rbx 0 rdx 0 rcx 0xffff80002a2962b0 rax 0xf8 r8 0x7f7fffffc000 r9 0xfffffd80097fb208 r10 0xdd52758dcda65b46 r11 0xfedd594d8810cbf2 r12 0xfffffd80625dfeb8 r13 0xdeaf4152deaf4152 r14 0xffff800001491d00 r15 0xf8 rip 0xffffffff82673062 sys_msgrcv+0x3f2 cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80003c4d5380 ss 0x10 sys_msgrcv+0x3f2: movq 0x10(%r13),%rdi ddb{0}> show proc PROC (syz-executor) tid=461775 pid=16729 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=36, usrpri=81, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c4b34b8,0xffff80002a2967e0 process=0xffff80003c4b5868 user=0xffff80003c4d0000, vmspace=0xfffffd806c26ad38 estcpu=31, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 57333 337442 37334 60928 2 0x10 syz-executor 57333 444980 37334 60928 3 0x4000090 fsleep syz-executor 43362 354788 14233 0 2 0 syz-executor 43362 468913 14233 0 2 0x4000000 syz-executor 3669 340754 12569 0 2 0 syz-executor 3669 164970 12569 0 3 0x4000080 sbwait syz-executor 3669 79859 12569 0 3 0x4000080 fsleep syz-executor 11758 251969 66732 0 2 0 syz-executor 11758 141140 66732 0 3 0x4000080 fsleep syz-executor 56255 378603 91361 0 2 0 syz-executor 56255 387530 91361 0 3 0x4000080 fsleep syz-executor 16729 318833 62824 0 7 0 syz-executor 16729 99768 62824 0 3 0x4000080 fsleep syz-executor *16729 461775 62824 0 7 0x4000000 syz-executor 16729 459633 62824 0 2 0x4000000 syz-executor 31346 39505 67246 0 3 0x81000 fltagain2 syz-executor 31346 117343 67246 0 2 0x4081000 syz-executor 31346 51305 67246 0 3 0x4081000 fltagain2 syz-executor 31346 304168 67246 0 3 0x4003000 suspend syz-executor 44773 312289 0 0 3 0x14200 acct acct 47243 455082 0 0 3 0x14200 bored sosplice 57875 432366 0 0 3 0x14280 nfsidl nfsio 66018 144426 0 0 3 0x14280 nfsidl nfsio 93924 218825 0 0 3 0x14280 nfsidl nfsio 8254 73515 0 0 3 0x14280 nfsidl nfsio 91124 80577 0 0 3 0x14280 nfsidl nfsio 34508 508010 0 0 3 0x14280 nfsidl nfsio 9828 220922 0 0 3 0x14280 nfsidl nfsio 76867 216127 0 0 3 0x14280 nfsidl nfsio 55224 202497 0 0 3 0x14280 nfsidl nfsio 29387 273065 0 0 3 0x14280 nfsidl nfsio 75523 355256 0 0 3 0x14280 nfsidl nfsio 56052 373244 0 0 3 0x14280 nfsidl nfsio 22940 384215 0 0 3 0x14280 nfsidl nfsio 93327 43397 0 0 3 0x14280 nfsidl nfsio 91639 426338 0 0 3 0x14280 nfsidl nfsio 42921 245258 0 0 3 0x14280 nfsidl nfsio 29583 26075 0 0 3 0x14280 nfsidl nfsio 79503 199225 0 0 3 0x14280 nfsidl nfsio 61558 344951 0 0 3 0x14280 nfsidl nfsio 69141 283368 0 0 3 0x14280 nfsidl nfsio 62824 332917 49391 0 3 0x82 nanoslp syz-executor 28510 390489 49391 0 2 0x10000c82 syz-executor 66732 336833 49391 0 2 0x2 syz-executor 12569 212876 49391 0 2 0xc82 syz-executor 91361 491631 49391 0 3 0x82 nanoslp syz-executor 37334 420763 49391 0 3 0x82 nanoslp syz-executor 14233 321384 49391 0 3 0x82 nanoslp syz-executor 67246 316144 49391 0 3 0x82 wait syz-executor 49391 481798 59140 0 3 0x82 kqread syz-executor 59140 148303 65835 0 3 0x10008a sigsusp ksh 65835 245333 21327 0 3 0x98 kqread sshd-session 21327 126592 70319 0 3 0x92 kqread sshd-session 56188 234321 1 0 3 0x100083 ttyin getty 70319 373269 1 0 3 0x88 kqread sshd 4808 212318 38200 74 3 0x1100092 bpf pflogd 38200 429760 1 0 3 0x80 sbwait pflogd 12106 413765 82343 73 3 0x1100090 kqread syslogd 82343 309300 1 0 3 0x100082 sbwait syslogd 73753 455225 1 0 3 0x100080 kqread resolvd 17713 314423 50274 77 3 0x100092 kqread dhcpleased 23095 175786 50274 77 3 0x100092 kqread dhcpleased 50274 316426 1 0 3 0x80 kqread dhcpleased 95139 246378 0 0 3 0x14200 bored smr 72773 418683 0 0 3 0x14200 pgzero zerothread 10016 178074 0 0 3 0x14200 aiodoned aiodoned 88352 489973 0 0 3 0x14200 syncer update 4745 10502 0 0 3 0x14200 cleaner cleaner 38444 80660 0 0 3 0x14200 reaper reaper 10294 33228 0 0 3 0x14200 pgdaemon pagedaemon 21485 272358 0 0 3 0x14200 bored viomb 42258 24135 0 0 3 0x40014200 acpi0 acpi0 57674 518832 0 0 3 0x40014200 idle1 55348 146142 0 0 3 0x14200 bored softnet3 1386 430170 0 0 3 0x14200 bored softnet2 29482 285151 0 0 3 0x14200 bored softnet1 10029 309848 0 0 3 0x14200 bored softnet0 52291 75883 0 0 3 0x14200 bored systqmp 89159 363554 0 0 3 0x14200 bored systq 41746 399609 0 0 3 0x14200 tmoslp softclockmp 85403 251692 0 0 3 0x40014200 tmoslp softclock 79756 63685 0 0 3 0x40014200 idle0 1 484732 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 16729 (syz-executor) thread 0xffff80002a2962b0 (461775) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839f1408) #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+0x2ac sys/kern/kern_rwlock.c:379 #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:279 #8 kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332 #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:579 #12 Xsyscall+0x128 Process 31346 (syz-executor) thread 0xffff80003c43f738 (117343) exclusive rrwlock inode r = 0 (0xfffffd806be2cf40) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x190 sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x23c sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10201 11040K 11292K 166960K 11573 0 pcb 20 14K 16K 166960K 177 0 rtable 225 7K 8K 166960K 394 0 pf 34 17K 18K 166960K 60 0 ifaddr 43 7K 7K 166960K 56 0 ifgroup 55 2K 2K 166960K 74 0 sysctl 1 1K 9K 166960K 71 0 counters 68 36K 37K 166960K 92 0 ioctlops 0 0K 4K 166960K 1508 0 iov 0 0K 16K 166960K 35 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1339 84K 85K 166960K 1544 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 6 0K 0K 166960K 6 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 387 0 sigio 0 0K 0K 166960K 3 0 proc 72 91K 140K 166960K 557 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 32 0 in_multi 92 7K 7K 166960K 110 0 ether_multi 1 0K 0K 166960K 3 0 mrt 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 383 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 246 161K 174K 166960K 5223 0 UVM aobj 9 4K 4K 166960K 9 0 pinsyscall 42 84K 106K 166960K 1487 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 15 0 NDP 12 0K 2K 166960K 35 0 temp 76 8696K 8942K 166960K 15229 0 kqueue 14 22K 29K 166960K 81 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 53 0 47 1 0 1 1 0 8 0 rtentry 176 121 0 20 6 0 6 6 0 8 0 unpcb 144 167 0 146 2 1 1 2 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 102 0 97 4 1 3 4 0 8 2 arp 128 20 0 1 1 0 1 1 0 8 0 inpcb 328 393 0 381 7 3 4 7 0 8 2 nd6 144 25 0 2 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 10 0 10 1 0 1 1 0 8 1 pppxif 1504 1 0 1 1 0 1 1 0 8 1 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 35 0 1 1 0 1 1 0 8 0 pfstkey 128 35 0 1 2 0 2 2 0 8 0 pfstate 384 35 0 1 4 0 4 4 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 256 471 0 70 29 0 29 29 0 8 1 art_table 32 472 0 70 4 0 4 4 0 8 0 art_node 16 119 0 32 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 2 2 1 1 1 0 8 0 semapl 112 4 0 0 1 0 1 1 0 8 0 shmpl 112 6 0 0 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2038 0 531 95 0 95 95 0 8 0 ffsino 288 2038 0 531 109 0 109 109 0 8 0 nchpl 144 2597 0 905 64 0 64 64 0 8 0 rtmask 32 3 0 3 2 1 1 1 0 8 1 uvmvnodes 80 2223 0 0 46 0 46 46 0 8 0 vnodes 216 2223 0 0 124 0 124 124 0 8 0 namei 1024 8014 0 8014 2 1 1 2 0 8 1 percpumem 16 61 0 12 1 0 1 1 0 8 0 kstatmem 264 40 0 14 2 0 2 2 0 8 0 scsiplug 72 4 0 4 1 1 0 1 0 8 0 scxspl 216 11071 0 11071 5 4 1 3 1 8 1 plimitpl 152 55 0 37 1 0 1 1 0 8 0 sigapl 424 714 0 642 9 0 9 9 0 8 0 knotepl 120 316 0 0 10 0 10 10 0 8 0 kqueuepl 224 129 0 118 2 0 2 2 0 8 1 pipepl 336 121 0 94 3 0 3 3 0 8 0 fdescpl 520 673 0 642 3 0 3 3 0 8 0 filepl 160 3072 0 2814 13 2 11 13 0 8 0 lockfpl 104 100 0 98 1 0 1 1 0 8 0 lockfspl 48 45 0 43 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 34 0 17 1 0 1 1 0 8 0 ucredpl 104 279 0 265 1 0 1 1 0 8 0 zombiepl 144 643 0 642 1 0 1 1 0 8 0 processpl 1240 714 0 642 7 1 6 6 0 8 0 procpl 656 1159 0 1075 8 0 8 8 0 8 0 sosppl 168 2 0 2 1 1 0 1 0 8 0 sockpl 728 624 0 584 10 3 7 10 0 8 3 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 107 0 0 14 0 14 14 0 8 0 mcl2k 2048 24 0 0 3 0 3 3 0 8 0 mtagpl 96 8 0 0 1 0 1 1 0 8 0 mbufpl 256 223 0 0 14 0 14 14 0 8 0 bufpl 280 4337 0 120 302 0 302 302 0 8 0 anonpl 32 9239 0 0 75 0 75 75 0 246 0 amapchunkpl 152 16712 0 16078 30 1 29 30 0 158 4 amappl16 200 2850 0 2738 17 3 14 15 0 8 8 amappl15 192 2 0 2 1 1 0 1 0 8 0 amappl14 184 116 0 104 1 0 1 1 0 8 0 amappl13 176 7 0 7 2 1 1 1 0 8 1 amappl12 168 1359 0 1327 4 1 3 3 0 8 0 amappl11 160 56 0 42 1 0 1 1 0 8 0 amappl10 152 3 0 3 1 1 0 1 0 8 0 amappl9 144 272 0 272 1 1 0 1 0 8 0 amappl8 136 77 0 74 1 0 1 1 0 8 0 amappl7 128 138 0 126 1 0 1 1 0 8 0 amappl6 120 193 0 190 1 0 1 1 0 8 0 amappl5 112 125 0 114 1 0 1 1 0 8 0 amappl4 104 375 0 357 1 0 1 1 0 8 0 amappl3 96 2993 0 2879 5 1 4 4 0 8 1 amappl2 88 663 0 602 2 0 2 2 0 8 0 amappl1 80 9473 0 8864 15 0 15 15 0 8 0 amappl 88 4477 0 4306 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 8 0 0 1 0 1 1 0 8 0 uaddrrnd 24 673 0 642 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 673 0 642 1 0 1 1 0 8 0 vmmpekpl 168 7299 0 7263 3 0 3 3 0 8 0 vmmpepl 168 49562 0 47487 100 1 99 99 0 357 5 vmsppl 480 672 0 642 5 1 4 5 0 8 0 rwobjpl 72 18423 0 15171 60 0 60 60 0 8 0 pdppl 4096 1353 0 1284 109 38 71 85 0 8 2 pvpl 32 15090 0 0 123 1 122 122 0 265 0 pmappl 256 672 0 642 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 395 0 43 11 0 11 11 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_msgrcv(ffff80002a2962b0,ffff80003c4d5500,ffff80003c4d5450) at sys_msgrcv+0x3f2 msg_copyout sys/kern/sysv_msg.c:639 [inline] sys_msgrcv(ffff80002a2962b0,ffff80003c4d5500,ffff80003c4d5450) at sys_msgrcv+0x3f2 sys/kern/sysv_msg.c:349 syscall(ffff80003c4d5500) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4d5500) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70291f2b9b0, 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(ffffffff839f1200) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839f1200) at __mp_lock+0x192 sys/kern/kern_lock.c:165 syscall(ffff80003c449360) at syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c449360) at syscall+0xae6 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78e06111cac0, count: -6