*cpu1: uvm_fault(0xfffffd806b758020, 0x0, 0, 1) -> e ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7cb06ca4a920, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003c447a70 rbx 0 rdx 0 rcx 0xffff80003c448f88 rax 0x32 r8 0xffff80003c4479a0 r9 0x80713 acpi_pdirpa+0x6c584 r10 0xb0e565da691d1b4c r11 0x4a9264154bd22de7 r12 0 r13 0 r14 0xffff80003c448f88 r15 0 rip 0xffffffff817e23ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c4479f0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{0}> show proc PROC (syz-executor) tid=158548 pid=37206 tcnt=1 stat=onproc flags process=0 proc=0 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c449c58,0xffff80003c4dafa8 process=0xffff80003bc175c0 user=0xffff80003c442000, vmspace=0xfffffd806b7583f0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 76762 177620 600 0 2 0 syz-executor *37206 158548 21116 0 7 0 syz-executor 41483 468356 89490 0 2 0 syz-executor 41483 229175 89490 0 3 0x4000080 sbwait syz-executor 98160 355131 25939 0 2 0 syz-executor 94886 55264 0 0 3 0x14280 nfsidl nfsio 50418 427183 0 0 3 0x14280 nfsidl nfsio 28830 174044 0 0 3 0x14280 nfsidl nfsio 3960 351243 0 0 3 0x14280 nfsidl nfsio 63024 398601 0 0 3 0x14280 nfsidl nfsio 31946 432839 0 0 3 0x14280 nfsidl nfsio 92640 375757 0 0 3 0x14280 nfsidl nfsio 79204 75522 0 0 3 0x14280 nfsidl nfsio 37042 233983 0 0 3 0x14280 nfsidl nfsio 57793 347688 0 0 3 0x14280 nfsidl nfsio 69252 100587 0 0 3 0x14280 nfsidl nfsio 91586 273315 0 0 3 0x14280 nfsidl nfsio 73920 490160 0 0 3 0x14280 nfsidl nfsio 26543 460603 0 0 3 0x14280 nfsidl nfsio 70522 304782 0 0 3 0x14280 nfsidl nfsio 37491 92777 0 0 3 0x14280 nfsidl nfsio 7082 292224 0 0 3 0x14280 nfsidl nfsio 99693 288996 0 0 3 0x14280 nfsidl nfsio 53027 493212 0 0 3 0x14280 nfsidl nfsio 92284 485945 0 0 3 0x14280 nfsidl nfsio 88998 251719 16821 0 3 0x80 nanoslp syz-executor 88998 123382 16821 0 3 0x4000080 sbwait syz-executor 25816 42685 80134 0 3 0x3000 suspend syz-executor 25816 253639 80134 0 3 0x4081000 biowait syz-executor 25816 391532 80134 0 3 0x4081000 inode syz-executor 25816 304629 80134 0 3 0x4081000 inode syz-executor 25816 29927 80134 0 3 0x4081000 inode syz-executor 25816 22402 80134 0 3 0x4081000 inode syz-executor 25816 521283 80134 0 3 0x4081000 inode syz-executor 25816 441667 80134 0 3 0x4081000 inode syz-executor 34839 173800 0 0 3 0x14200 bored sosplice 47123 369377 0 0 3 0x14200 acct acct 80134 482757 81302 0 2 0x2 syz-executor 16821 186305 81302 0 3 0x82 nanoslp syz-executor 25939 208109 81302 0 3 0x82 nanoslp syz-executor 600 90195 81302 0 2 0x2 syz-executor 21116 18973 81302 0 3 0x82 nanoslp syz-executor 89490 352952 81302 0 3 0x82 nanoslp syz-executor 78349 182339 81302 0 3 0x82 wait syz-executor 98871 124088 81302 0 3 0x82 nanoslp syz-executor 81302 7123 77983 0 3 0x82 kqread syz-executor 77983 98526 99313 0 3 0x10008a sigsusp ksh 99313 57263 93267 0 3 0x98 kqread sshd-session 93267 450049 99867 0 3 0x92 kqread sshd-session 59359 250517 1 0 3 0x100083 ttyin getty 99867 18002 1 0 3 0x88 kqread sshd 86134 136328 90048 74 3 0x1100092 bpf pflogd 90048 9907 1 0 3 0x80 sbwait pflogd 87160 190179 55803 73 3 0x1100090 kqread syslogd 55803 322023 1 0 3 0x100082 sbwait syslogd 91648 371488 1 0 3 0x100080 kqread resolvd 75998 20099 26196 77 3 0x100092 kqread dhcpleased 31405 165910 26196 77 3 0x100092 kqread dhcpleased 26196 230064 1 0 3 0x80 kqread dhcpleased 60864 114601 0 0 3 0x14200 bored smr 68929 480190 0 0 2 0x14200 zerothread 20478 466081 0 0 3 0x14200 aiodoned aiodoned 41185 348841 0 0 3 0x14200 syncer update 5352 374798 0 0 3 0x14200 cleaner cleaner 82189 120700 0 0 3 0x14200 reaper reaper 85614 303075 0 0 3 0x14200 pgdaemon pagedaemon 78931 326737 0 0 3 0x14200 bored viomb 26720 490310 0 0 3 0x40014200 acpi0 acpi0 37600 441856 0 0 3 0x40014200 idle1 60198 479966 0 0 3 0x14200 bored softnet7 77989 14711 0 0 3 0x14200 bored softnet6 39237 183317 0 0 3 0x14200 bored softnet5 70924 307997 0 0 3 0x14200 bored softnet4 8971 224615 0 0 3 0x14200 bored softnet3 82872 108605 0 0 3 0x14200 bored softnet2 41068 483341 0 0 3 0x14200 bored softnet1 48337 40117 0 0 3 0x14200 bored softnet0 53120 119758 0 0 3 0x14200 bored systqmp 95440 262397 0 0 3 0x14200 bored systq 96969 181234 0 0 3 0x14200 tmoslp softclockmp 98805 273366 0 0 3 0x40014200 tmoslp softclock 293 301224 0 0 3 0x40014200 idle0 1 119315 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 25816 (syz-executor) thread 0xffff80003c4487d8 (253639) exclusive rrwlock inode r = 0 (0xfffffd806b71eb48) #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+0x42b sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #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:748 #9 Xsyscall+0x128 Process 25816 (syz-executor) thread 0xffff80003c4482b8 (391532) exclusive rrwlock inode r = 0 (0xfffffd806b71e8f8) #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+0x42b sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 dorenameat+0x91 sys/kern/vfs_syscalls.c:2986 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10207 11045K 11282K 166960K 11609 0 pcb 18 12K 12K 166960K 69 0 rtable 193 6K 7K 166960K 287 0 pf 34 17K 18K 166960K 55 0 ifaddr 43 7K 8K 166960K 54 0 ifgroup 55 2K 2K 166960K 65 0 sysctl 4 1K 9K 166960K 8 0 counters 68 36K 38K 166960K 86 0 ioctlops 0 0K 4K 166960K 1512 0 iov 1 2K 28K 166960K 16 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1342 84K 85K 166960K 1516 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 8 0K 1K 166960K 10 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 328 0 sigio 0 0K 0K 166960K 8 0 proc 72 115K 180K 166960K 539 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 21 0 in_multi 98 7K 7K 166960K 104 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 377 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 237 175K 198K 166960K 4628 0 UVM aobj 10 2K 2K 166960K 11 0 pinsyscall 43 86K 104K 166960K 1406 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 17 0 NDP 12 0K 2K 166960K 33 0 temp 46 8671K 8739K 166960K 13077 0 kqueue 14 22K 28K 166960K 61 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 56 0 53 1 0 1 1 0 8 0 rtentry 176 104 0 18 5 0 5 5 0 8 0 unpcb 144 322 0 298 4 0 4 4 0 8 3 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 51 0 47 2 0 2 2 0 8 1 arp 128 11 0 1 1 0 1 1 0 8 0 inpcb 328 278 0 270 7 0 7 7 0 8 6 nd6 144 19 0 1 1 0 1 1 0 8 0 pkpcb 40 5 0 4 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 9 0 9 1 0 1 1 0 8 1 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 2 0 0 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 30 0 0 1 0 1 1 0 8 0 pfstkey 128 30 0 0 1 0 1 1 0 8 0 pfstate 384 30 0 0 3 0 3 3 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 479 0 45 30 0 30 30 0 8 1 art_table 40 480 0 45 5 0 5 5 0 8 0 art_node 32 103 0 28 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 4 1 0 1 1 0 8 1 semapl 112 6 0 0 1 0 1 1 0 8 0 shmpl 112 8 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1958 0 448 95 0 95 95 0 8 0 ffsino 296 1958 0 448 117 0 117 117 0 8 0 nchpl 144 2392 0 702 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 uvmvnodes 80 2120 0 0 44 0 44 44 0 8 0 vnodes 216 2120 0 0 118 0 118 118 0 8 0 namei 1024 8163 0 8157 2 0 2 2 0 8 1 percpumem 16 58 0 9 1 0 1 1 0 8 0 kstatmem 264 36 0 10 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 12424 0 12423 9 1 8 8 1 8 7 plimitpl 152 93 0 75 1 0 1 1 0 8 0 sigapl 424 652 0 576 9 0 9 9 0 8 0 knotepl 120 302 0 0 10 0 10 10 0 8 0 kqueuepl 224 179 0 168 5 0 5 5 0 8 4 pipepl 344 124 0 97 3 0 3 3 0 8 0 fdescpl 528 608 0 576 3 0 3 3 0 8 0 filepl 160 3379 0 3150 17 0 17 17 0 8 5 lockfpl 104 67 0 63 1 0 1 1 0 8 0 lockfspl 48 31 0 27 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 35 0 18 1 0 1 1 0 8 0 ucredpl 104 554 0 541 1 0 1 1 0 8 0 zombiepl 144 579 0 576 1 0 1 1 0 8 0 processpl 1248 652 0 576 6 0 6 6 0 8 0 procpl 656 992 0 907 8 0 8 8 0 8 0 sosppl 168 1 0 1 1 0 1 1 0 8 1 sockpl 752 668 0 632 11 0 11 11 0 8 6 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 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 30 0 0 4 0 4 4 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 199 0 0 13 0 13 13 0 8 0 bufpl 280 5262 0 123 368 0 368 368 0 8 0 anonpl 32 7495 0 0 61 0 61 61 0 246 0 amapchunkpl 152 14617 0 14145 32 3 29 29 0 158 8 amappl16 200 2516 0 2257 14 0 14 14 0 8 0 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 110 0 98 1 0 1 1 0 8 0 amappl13 176 21 0 21 1 1 0 1 0 8 0 amappl12 168 1249 0 1218 4 1 3 3 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 260 0 260 1 1 0 1 0 8 0 amappl8 136 21 0 19 1 0 1 1 0 8 0 amappl7 128 108 0 96 1 0 1 1 0 8 0 amappl6 120 175 0 172 1 0 1 1 0 8 0 amappl5 112 118 0 108 1 0 1 1 0 8 0 amappl4 104 290 0 270 1 0 1 1 0 8 0 amappl3 96 2545 0 2438 4 0 4 4 0 8 0 amappl2 88 633 0 572 2 0 2 2 0 8 0 amappl1 80 8981 0 8385 14 0 14 14 0 8 0 amappl 88 3917 0 3755 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 10 0 1 1 0 1 1 0 8 0 uaddrrnd 24 608 0 576 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 608 0 576 1 0 1 1 0 8 0 vmmpekpl 168 6453 0 6418 2 0 2 2 0 8 0 vmmpepl 168 44716 0 42476 99 0 99 99 0 357 1 vmsppl 488 607 0 576 5 0 5 5 0 8 1 rwobjpl 80 17041 0 13760 68 0 68 68 0 8 0 pdppl 4096 1223 0 1152 97 26 71 85 0 8 0 pvpl 32 14655 0 0 119 0 119 119 0 265 0 pmappl 256 607 0 576 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 271 0 28 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7cb06ca4a920, count: -1 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp 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 x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:666 acpitimer_delay(1) at acpitimer_delay+0x58 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline] acpitimer_delay(1) at acpitimer_delay+0x58 sys/dev/acpi/acpitimer.c:120 comcnputc(800,a) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(a) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(a) at db_putchar+0x774 sys/ddb/db_output.c:168 kprintf() at kprintf+0x843 sys/kern/subr_prf.c:-1 db_printf(ffffffff834104fa) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff833b16fc) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80003bc2b030,0) at kpageflttrap+0x385 sys/arch/amd64/amd64/trap.c:294 kerntrap(ffff80003bc2b030) at kerntrap+0x13c sys/arch/amd64/amd64/trap.c:491 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b end trace frame: 0xffff80003bc2b110, count: 0 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 x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:666 acpitimer_delay(1) at acpitimer_delay+0x58 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline] acpitimer_delay(1) at acpitimer_delay+0x58 sys/dev/acpi/acpitimer.c:120 comcnputc(800,a) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(a) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(a) at db_putchar+0x774 sys/ddb/db_output.c:168 kprintf() at kprintf+0x843 sys/kern/subr_prf.c:-1 db_printf(ffffffff834104fa) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff833b16fc) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80003bc2b030,0) at kpageflttrap+0x385 sys/arch/amd64/amd64/trap.c:294 kerntrap(ffff80003bc2b030) at kerntrap+0x13c sys/arch/amd64/amd64/trap.c:491 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000149e000) at dt_ioctl_record_stop+0xf0 sys/dev/dt/dt_dev.c:580 dtclose(11e5f,81,2000,ffff80003c449c58) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003c449c58) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003bc2b1e0) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e5f30d8,81,fffffd80097fb138,ffff80003c449c58) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b8227c0,ffff80003c449c58) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b8227c0,ffff80003c449c58) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b8227c0,ffff80003c449c58) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806b8227c0,ffff80003c449c58) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80003c449c58) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80003c449c58,b,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003c449c58,ffff80003bc2b550,ffff80003bc2b4a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003bc2b550) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bc2b550) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75679513ef10, count: -26