kernel: protection fault trap, code=0 Stopped at done_flush+0x38: movl %eax,%dr6 ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace end trace frame: 0x0, count: -1 ddb{0}> show registers rdi 0x6c14 __ALIGN_SIZE+0x5c14 rsi 0xffff80003c447a18 rbp 0 rbx 0x756e6547 rdx 0x49656e69 rcx 0x6c65746e rax 0xd800000000000000 r8 0 r9 0x10000 __ALIGN_SIZE+0xf000 r10 0 r11 0 r12 0 r13 0 r14 0 r15 0 rip 0xffffffff82f9f61b done_flush+0x38 cs 0x8 rflags 0x10046 __ALIGN_SIZE+0xf046 rsp 0xffff80003c45ae48 ss 0x10 done_flush+0x38: movl %eax,%dr6 ddb{0}> show proc PROC (syz-executor) tid=96742 pid=13896 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffe6550,0xffff8000fffe62c8 process=0xffff8000397f5830 user=0xffff80003c456000, vmspace=0xfffffd806c7207c0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 93896 253935 58366 0 2 0 syz-executor 13896 31928 98103 0 7 0 syz-executor *13896 96742 98103 0 7 0x4000000 syz-executor 79388 242327 344 0 2 0 syz-executor 79388 472233 344 0 2 0x4000000 syz-executor 20606 337406 56161 0 2 0 syz-executor 20606 225004 56161 0 3 0x4000080 fsleep syz-executor 85682 290434 45241 0 3 0x80 nanoslp syz-executor 85682 160471 45241 0 3 0x4000080 kqread syz-executor 85682 468329 45241 0 3 0x4000080 fsleep syz-executor 69884 370087 73193 0 2 0 syz-executor 69884 283685 73193 0 3 0x4000080 fsleep syz-executor 28047 192864 3153 0 3 0x3000 suspend syz-executor 28047 266435 3153 0 2 0x4081000 syz-executor 99922 281074 32389 0 3 0x82 wait syz-executor 3153 380315 32389 0 3 0x82 wait syz-executor 344 42380 32389 0 3 0x82 nanoslp syz-executor 56161 293487 32389 0 3 0x82 nanoslp syz-executor 45241 223160 32389 0 3 0x82 nanoslp syz-executor 58366 321551 32389 0 3 0x82 nanoslp syz-executor 98103 643 32389 0 3 0x82 nanoslp syz-executor 73193 30674 32389 0 3 0x82 nanoslp syz-executor 32389 156293 88337 0 3 0x82 kqread syz-executor 88337 313257 91273 0 3 0x10008a sigsusp ksh 91273 353351 61362 0 3 0x98 kqread sshd-session 61362 519414 26951 0 3 0x92 kqread sshd-session 91244 118465 1 0 3 0x100083 ttyopn getty 26951 242751 1 0 3 0x88 kqread sshd 89280 506537 91040 74 3 0x1100092 bpf pflogd 91040 134998 1 0 3 0x80 sbwait pflogd 19666 404905 59506 73 3 0x1100090 kqread syslogd 59506 65135 1 0 3 0x100082 sbwait syslogd 23809 69919 1 0 3 0x100080 kqread resolvd 23668 450883 49429 77 3 0x100092 kqread dhcpleased 63512 98922 49429 77 3 0x100092 kqread dhcpleased 49429 112305 1 0 3 0x80 kqread dhcpleased 43677 483451 0 0 3 0x14200 bored smr 67416 128356 0 0 2 0x14200 zerothread 41388 191264 0 0 3 0x14200 aiodoned aiodoned 69426 436686 0 0 3 0x14200 syncer update 39810 495948 0 0 3 0x14200 cleaner cleaner 24810 158167 0 0 3 0x14200 reaper reaper 39010 284002 0 0 3 0x14200 pgdaemon pagedaemon 4584 401095 0 0 3 0x14200 bored viomb 3307 408989 0 0 3 0x40014200 acpi0 acpi0 11318 384633 0 0 3 0x40014200 idle1 82226 473194 0 0 3 0x14200 bored softnet1 59548 483233 0 0 3 0x14200 bored softnet0 78317 103830 0 0 3 0x14200 bored systqmp 42487 246640 0 0 3 0x14200 bored systq 81606 466802 0 0 3 0x14200 tmoslp softclockmp 88105 489953 0 0 3 0x40014200 tmoslp softclock 79645 170470 0 0 3 0x40014200 idle0 1 424943 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 13896 (syz-executor) thread 0xffff8000fffe67e8 (96742) exclusive rwlock vcpu r = 0 (0xffff80003c447770) #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 vm_run+0xa2 sys/arch/amd64/amd64/vmm_machdep.c:-1 #3 vmmioctl+0x337 sys/dev/vmm/vmm.c:254 #4 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #5 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 #6 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #7 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #8 Xsyscall+0x128 Process 28047 (syz-executor) thread 0xffff8000fffeed10 (266435) exclusive rrwlock inode r = 0 (0xfffffd806c837330) #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 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11092 12170K 12299K 166960K 12863 0 pcb 18 14K 16K 166960K 304 0 rtable 213 9K 9K 166960K 454 0 pf 34 17K 18K 166960K 90 0 ifaddr 39 7K 8K 166960K 73 0 ifgroup 51 2K 2K 166960K 115 0 sysctl 3 1K 9K 166960K 8 0 counters 68 36K 37K 166960K 134 0 ioctlops 0 0K 4K 166960K 1639 0 iov 0 0K 17K 166960K 34 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1361 86K 86K 166960K 1686 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 183 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 607 0 sigio 0 0K 0K 166960K 11 0 proc 72 115K 164K 166960K 578 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 2 0K 0K 166960K 73 0 in_multi 89 6K 7K 166960K 118 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 247 1102K 1102K 166960K 247 0 exec 0 0K 1K 166960K 533 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 168K 183K 166960K 7525 0 UVM aobj 55 8K 8K 166960K 56 0 pinsyscall 43 86K 103K 166960K 1776 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 40 0 NDP 11 0K 2K 166960K 50 0 temp 81 8680K 8781K 166960K 28058 0 kqueue 14 22K 30K 166960K 119 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 120 146 0 143 3 1 2 2 0 8 1 rtentry 176 129 0 41 6 0 6 6 0 8 0 unpcb 144 464 0 447 4 0 4 4 0 8 3 syncache 336 7 0 7 1 0 1 1 0 8 1 tcpqe 32 2 0 2 1 0 1 1 0 8 1 tcpcb 736 344 0 337 9 2 7 7 0 8 6 arp 136 21 0 5 1 0 1 1 0 8 0 inpcb 328 1109 0 1096 10 2 8 10 0 8 6 nd6 152 27 0 5 2 0 2 2 0 8 0 pkpcb 40 5 0 5 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 26 0 26 1 0 1 1 0 8 1 pfstscr 40 2 0 2 1 0 1 1 0 8 1 pffrag 232 38 0 32 1 0 1 1 0 482 0 pffrnode 88 38 0 32 1 0 1 1 0 8 0 pffrent 40 71 0 65 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 2 0 0 1 0 1 1 0 8 0 pfstkey 128 8 0 6 1 0 1 1 0 8 0 pfstate 448 4 0 3 1 0 1 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 497 0 116 31 0 31 31 0 8 3 art_table 40 500 0 116 5 0 5 5 0 8 0 art_node 32 127 0 49 1 0 1 1 0 8 0 sysvmsgpl 40 17 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 181 0 171 1 0 1 1 0 8 0 shmpl 112 51 0 1 2 0 2 2 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2462 0 962 95 0 95 95 0 8 0 ffsino 296 2462 0 962 117 0 117 117 0 8 0 nchpl 144 3328 0 1627 64 0 64 64 0 8 0 rtmask 32 8 0 8 1 0 1 1 0 8 1 vnodes 216 2709 0 0 151 0 151 151 0 8 0 namei 1024 10860 0 10860 2 0 2 2 0 8 2 percpumem 16 82 0 33 1 0 1 1 0 8 0 vcpupl 3968 2 0 0 1 0 1 1 0 8 0 vmpool 848 2 0 0 1 0 1 1 0 8 0 kstatmem 264 68 0 44 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 26144 0 26144 11 3 8 8 1 8 8 plimitpl 152 304 0 284 1 0 1 1 0 8 0 sigapl 424 918 0 870 7 1 6 7 0 8 0 knotepl 120 520 0 0 16 0 16 16 0 8 0 kqueuepl 224 285 0 274 5 0 5 5 0 8 4 pipepl 344 174 0 146 4 0 4 4 0 8 1 fdescpl 528 902 0 870 3 0 3 3 0 8 0 filepl 160 5400 0 5162 18 0 18 18 0 8 6 lockfpl 104 239 0 237 2 1 1 2 0 8 0 lockfspl 48 104 0 102 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 41 0 24 1 0 1 1 0 8 0 ucredpl 104 613 0 599 1 0 1 1 0 8 0 zombiepl 144 872 0 870 1 0 1 1 0 8 0 processpl 1232 918 0 870 5 0 5 5 0 8 0 procpl 664 1808 0 1753 6 0 6 6 0 8 0 sockpl 752 1740 0 1707 14 3 11 14 0 8 6 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 129 0 0 17 0 17 17 0 8 0 mcl2k 2048 41 0 0 6 0 6 6 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 267 0 0 17 0 17 17 0 8 0 bufpl 280 11210 0 5074 439 0 439 439 0 8 0 anonpl 32 17167 0 0 140 1 139 139 0 246 0 amapchunkpl 152 24245 0 23595 36 0 36 36 0 158 8 amappl16 200 3846 0 3573 44 15 29 39 0 8 8 amappl15 192 37 0 37 1 1 0 1 0 8 0 amappl14 184 1 0 1 1 1 0 1 0 8 0 amappl13 176 442 0 441 1 0 1 1 0 8 0 amappl12 168 1287 0 1245 3 0 3 3 0 8 0 amappl11 160 16 0 15 1 0 1 1 0 8 0 amappl10 152 51 0 36 1 0 1 1 0 8 0 amappl9 144 251 0 251 1 1 0 1 0 8 0 amappl8 136 53 0 49 1 0 1 1 0 8 0 amappl7 128 82 0 81 1 0 1 1 0 8 0 amappl6 120 284 0 270 1 0 1 1 0 8 0 amappl5 112 94 0 84 1 0 1 1 0 8 0 amappl4 104 464 0 435 1 0 1 1 0 8 0 amappl3 96 4088 0 3991 4 1 3 3 0 8 0 amappl2 88 1041 0 966 2 0 2 2 0 8 0 amappl1 80 11932 0 11333 16 1 15 15 0 8 0 amappl 88 6661 0 6488 5 0 5 5 0 92 0 uvmvnodes 80 132 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 dma512 512 1 0 1 1 0 1 1 0 8 1 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 7 0 7 2 1 1 1 0 8 1 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 55 0 1 1 0 1 1 0 8 0 uaddrrnd 24 902 0 870 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 902 0 870 1 0 1 1 0 8 0 vmmpekpl 168 9195 0 9155 3 0 3 3 0 8 0 vmmpepl 168 66042 0 63825 118 0 118 118 0 357 13 vmsppl 488 901 0 870 5 0 5 5 0 8 1 rwobjpl 80 21478 0 20111 38 0 38 38 0 8 5 pdppl 4096 1815 0 1742 107 34 73 85 0 8 0 pvpl 32 24170 0 0 195 0 195 195 0 265 0 pmappl 256 903 0 870 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 304 0 38 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace end trace frame: 0x0, count: -1 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 end of kernel end trace frame: 0x7d7646523a10, count: -3