*cpu1: uvm_fault(0xfffffd800b0277a0, 0x0, 0, 1) -> e ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7f40ce6b7860, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800030fff190 rbx 0 rdx 0 rcx 0xffff80003c04aa90 rax 0x31 r8 0xffff800030fff0c0 r9 0 r10 0xab8270433ff74909 r11 0x5ed6f08413417c3 r12 0 r13 0 r14 0xffff80003c04aa90 r15 0 rip 0xffffffff81c943ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff800030fff110 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{0}> show proc PROC (syz-executor) tid=237819 pid=29821 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=0xffff8000330087e8,0xffffffff838ee388 process=0xffff80002a2a7500 user=0xffff800030ffa000, vmspace=0xfffffd806b9c6200 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *29821 237819 13576 0 7 0 syz-executor 53616 409537 83528 0 2 0 syz-executor 53616 394039 83528 0 3 0x4000080 piperd syz-executor 53616 350400 83528 0 3 0x4000080 kqsel syz-executor 46971 122114 0 0 3 0x14200 acct acct 98969 144222 58479 0 3 0x80 nanoslp syz-executor 98969 208238 58479 0 3 0x4000080 fifor syz-executor 98969 140884 58479 0 3 0x4000080 fsleep syz-executor 98275 509153 42955 0 3 0x80 nanoslp syz-executor 98275 274878 42955 0 3 0x4000080 kqread syz-executor 98275 439460 42955 0 3 0x4000080 fsleep syz-executor 98275 39476 42955 0 3 0x4000080 fsleep syz-executor 58479 408774 91784 0 3 0x82 nanoslp syz-executor 42955 12814 91784 0 3 0x82 nanoslp syz-executor 83528 318232 91784 0 3 0x82 nanoslp syz-executor 16592 26333 1 0 3 0x100083 ttyopn getty 21955 70120 91784 0 3 0x82 nanoslp syz-executor 92176 291812 91784 0 3 0x82 nanoslp syz-executor 47851 396661 0 0 3 0x14200 bored sosplice 13576 61239 91784 0 3 0x82 nanoslp syz-executor 16875 41266 91784 0 3 0x82 nanoslp syz-executor 27063 281277 91784 0 3 0x82 nanoslp syz-executor 91784 158829 65996 0 3 0x82 kqread syz-executor 65996 346043 22391 0 3 0x10008a sigsusp ksh 22391 370111 13830 0 3 0x98 kqread sshd-session 13830 5219 14991 0 3 0x92 kqread sshd-session 14991 240753 1 0 3 0x88 kqread sshd 14107 224850 76274 74 3 0x1100092 bpf pflogd 76274 270591 1 0 3 0x80 sbwait pflogd 62187 392302 72310 73 3 0x1100090 kqread syslogd 72310 291826 1 0 3 0x100082 sbwait syslogd 50352 160829 1 0 3 0x100080 kqread resolvd 29309 71865 0 0 3 0x14200 bored smr 81198 418892 0 0 2 0x14200 zerothread 16587 493166 0 0 3 0x14200 aiodoned aiodoned 78942 194167 0 0 3 0x14200 syncer update 88263 99054 0 0 3 0x14200 cleaner cleaner 48625 406691 0 0 2 0x14200 reaper 1292 144780 0 0 3 0x14200 pgdaemon pagedaemon 66138 424729 0 0 3 0x14200 bored viomb 63858 384644 0 0 3 0x40014200 acpi0 acpi0 53394 478536 0 0 3 0x40014200 idle1 64193 450151 0 0 3 0x14200 bored softnet7 35515 47822 0 0 3 0x14200 bored softnet6 58406 448263 0 0 3 0x14200 bored softnet5 72662 184570 0 0 3 0x14200 bored softnet4 76786 147092 0 0 3 0x14200 bored softnet3 4957 58021 0 0 3 0x14200 bored softnet2 3310 172222 0 0 3 0x14200 bored softnet1 55531 85751 0 0 3 0x14200 bored softnet0 21336 53804 0 0 3 0x14200 bored systqmp 92997 375812 0 0 3 0x14200 bored systq 48077 403221 0 0 3 0x14200 tmoslp softclockmp 97597 425306 0 0 3 0x40014200 tmoslp softclock 40298 111644 0 0 3 0x40014200 idle0 1 14772 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &newfdp->fd_fd.fd_fplock r = 0 (0xffff80003a423b80) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 fdrelease+0x8e fd_getfile sys/kern/kern_descrip.c:238 [inline] #3 fdrelease+0x8e sys/kern/kern_descrip.c:753 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #5 Xsyscall+0x128 Process 29821 (syz-executor) thread 0xffff80003c04aa90 (237819) Process 48625 (reaper) thread 0xffff8000ffffc7d0 (406691) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10254 11139K 11264K 166960K 13515 0 pcb 18 18K 20K 166960K 915 0 rtable 202 13K 14K 166960K 1062 0 pf 42 19K 131089K 166960K 387 0 ifaddr 37 6K 8K 166960K 202 0 ifgroup 64 2K 3K 166960K 356 0 sysctl 4 1K 9K 166960K 111 0 counters 72 37K 38K 166960K 398 0 ioctlops 0 0K 4K 166960K 2214 0 iov 1 1K 28K 166960K 226 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1459 92K 92K 166960K 3590 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 37 0 VM map 2 1K 1K 166960K 2 0 sem 20 36K 37K 166960K 247 0 dirhash 12 2K 3K 166960K 36 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 2973 0 sigio 0 0K 0K 166960K 107 0 proc 74 115K 196K 166960K 1033 0 subproc 72 4K 4K 166960K 118 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 564 0 in_multi 63 4K 7K 166960K 299 0 ether_multi 1 0K 0K 166960K 50 0 mrt 1 0K 0K 166960K 35 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 259 1155K 1155K 166960K 259 0 exec 0 0K 1K 166960K 863 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 9 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 223 165K 182K 166960K 28383 0 UVM aobj 36 2K 4K 166960K 38 0 pinsyscall 37 74K 104K 166960K 4252 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 1K 166960K 259 0 NDP 14 0K 1K 166960K 150 0 temp 85 8656K 8912K 166960K 144240 0 kqueue 9 16K 32K 166960K 680 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 120 461 0 460 6 2 4 4 0 8 3 rtentry 176 356 0 288 5 0 5 5 0 8 0 unpcb 144 1975 0 1960 13 7 6 6 0 8 5 syncache 336 18 0 18 5 4 1 1 0 8 1 tcpqe 32 5 0 5 4 4 0 1 0 8 0 tcpcb 736 1292 0 1282 21 19 2 7 0 8 0 arp 136 91 0 80 1 0 1 1 0 8 0 inpcb 328 4097 0 4086 37 29 8 15 0 8 6 nd6 144 40 0 25 1 0 1 1 0 8 0 pkpcb 40 31 0 31 2 1 1 1 0 8 1 kcovpl 48 13 0 5 1 0 1 1 0 8 0 ppxss 1192 133 0 133 2 1 1 1 0 8 1 pppxif 1504 9 0 9 5 5 0 1 0 8 0 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pffrag 232 25 0 14 1 0 1 1 0 482 0 pffrnode 88 18 0 7 1 0 1 1 0 8 0 pffrent 40 46 0 35 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 pfrktable 1344 3 0 3 2 2 0 1 0 8 0 pfanchor 1288 3 0 0 1 0 1 1 0 8 0 pftag 88 66 0 66 2 2 0 1 0 8 0 pfstitem 24 205 0 87 1 0 1 1 0 8 0 pfstkey 128 207 0 89 5 0 5 5 0 8 0 pfstate 384 205 0 88 13 0 13 13 0 8 0 pfrule 1344 94 0 89 2 1 1 2 0 8 0 rttmr 136 8 0 8 5 5 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 1284 0 959 35 10 25 31 0 8 0 art_table 40 1288 0 959 5 0 5 5 0 8 0 art_node 32 353 0 295 2 0 2 2 0 8 0 sysvmsgpl 40 2 0 2 1 1 0 1 0 8 0 semupl 112 8 0 8 3 2 1 1 0 8 1 semapl 112 237 0 219 1 0 1 1 0 8 0 shmpl 112 35 0 2 1 0 1 1 0 8 0 dirhash 1024 33 0 16 3 0 3 3 0 8 0 dino2pl 256 7124 0 5602 96 0 96 96 0 8 0 ffsino 296 7124 0 5602 118 0 118 118 0 8 0 nchpl 144 11316 0 9602 64 0 64 64 0 8 0 rtmask 32 29 0 29 3 2 1 1 0 8 1 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 39732 0 39732 3 2 1 2 0 8 1 percpumem 16 214 0 163 1 0 1 1 0 8 0 kstatmem 264 252 0 218 5 2 3 3 0 8 0 scsiplug 72 15 0 15 6 5 1 1 0 8 1 scxspl 216 64347 0 64347 14 12 2 8 1 8 2 plimitpl 152 1110 0 1093 1 0 1 1 0 8 0 sigapl 424 3292 0 3239 9 2 7 9 0 8 0 knotepl 120 549 0 0 16 0 16 16 0 8 0 kqueuepl 224 1506 0 1497 16 13 3 5 0 8 2 pipepl 344 466 0 438 8 0 8 8 0 8 5 fdescpl 528 3240 0 3211 3 0 3 3 0 8 0 filepl 160 23512 0 23299 41 21 20 21 0 8 8 lockfpl 104 959 0 957 1 0 1 1 0 8 0 lockfspl 48 395 0 393 1 0 1 1 0 8 0 sessionpl 144 39 0 31 1 0 1 1 0 8 0 pgrppl 48 247 0 230 1 0 1 1 0 8 0 ucredpl 104 4254 0 4243 1 0 1 1 0 8 0 zombiepl 144 4498 0 4494 1 0 1 1 0 8 0 processpl 1232 3292 0 3239 6 0 6 6 0 8 0 procpl 664 8128 0 8066 9 2 7 8 0 8 0 sosppl 168 25 0 25 4 3 1 1 0 8 1 sockpl 752 6640 0 6613 74 62 12 27 0 8 8 mcl64k 65536 20 0 0 3 0 3 3 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 125 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 50 0 0 6 0 6 6 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1268 0 0 77 0 77 77 0 8 0 bufpl 280 24421 0 18278 440 0 440 440 0 8 0 anonpl 32 14467 0 0 117 0 117 117 0 246 0 amapchunkpl 152 105749 0 105078 56 25 31 37 0 158 5 amappl16 200 9789 0 9758 58 41 17 32 0 8 8 amappl15 192 5 0 4 1 0 1 1 0 8 0 amappl14 184 154 0 144 1 0 1 1 0 8 0 amappl13 176 9 0 9 1 1 0 1 0 8 0 amappl12 168 3991 0 3963 4 1 3 3 0 8 0 amappl11 160 61 0 53 1 0 1 1 0 8 0 amappl10 152 76 0 76 1 1 0 1 0 8 0 amappl9 144 253 0 253 1 1 0 1 0 8 0 amappl8 136 22 0 19 1 0 1 1 0 8 0 amappl7 128 147 0 137 1 0 1 1 0 8 0 amappl6 120 240 0 236 1 0 1 1 0 8 0 amappl5 112 168 0 160 1 0 1 1 0 8 0 amappl4 104 381 0 360 1 0 1 1 0 8 0 amappl3 96 17762 0 17672 4 1 3 3 0 8 0 amappl2 88 3568 0 3507 2 0 2 2 0 8 0 amappl1 80 22385 0 21874 14 0 14 14 0 8 0 amappl 88 26991 0 26827 5 0 5 5 0 92 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 4 0 3 1 0 1 1 0 8 0 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 256 0 256 4 4 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 37 0 2 1 0 1 1 0 8 0 uaddrrnd 24 3240 0 3211 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3240 0 3211 1 0 1 1 0 8 0 vmmpekpl 168 26488 0 26430 4 1 3 4 0 8 0 vmmpepl 168 207542 0 205787 123 28 95 104 0 357 7 vmsppl 488 3239 0 3211 5 1 4 5 0 8 0 rwobjpl 80 59138 0 52373 154 7 147 151 0 8 4 pdppl 4096 6488 0 6422 128 62 66 88 0 8 0 pvpl 32 22556 0 0 182 0 182 182 0 265 0 pmappl 256 3239 0 3211 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 410 0 104 10 0 10 10 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7f40ce6b7860, count: -1 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299edff0) 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:674 acpitimer_delay(1) at acpitimer_delay+0x57 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline] acpitimer_delay(1) at acpitimer_delay+0x57 sys/dev/acpi/acpitimer.c:120 comcnputc(800,65) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(65) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(65) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x203 sys/kern/subr_prf.c:723 db_printf(ffffffff834021a2) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80002a31eeb0) at db_ktrap+0xe3 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80002a31eeb0) at db_ktrap+0xe3 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80002a31eeb0) at kerntrap+0x23e sys/arch/amd64/amd64/trap.c:480 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000147a000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 end trace frame: 0xffff80002a31efe0, count: 0 ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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:674 acpitimer_delay(1) at acpitimer_delay+0x57 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline] acpitimer_delay(1) at acpitimer_delay+0x57 sys/dev/acpi/acpitimer.c:120 comcnputc(800,65) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(65) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(65) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x203 sys/kern/subr_prf.c:723 db_printf(ffffffff834021a2) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80002a31eeb0) at db_ktrap+0xe3 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80002a31eeb0) at db_ktrap+0xe3 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80002a31eeb0) at kerntrap+0x23e sys/arch/amd64/amd64/trap.c:480 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000147a000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80003c04b4f0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003c04b4f0) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002a31f060) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805d88d528,81,fffffd80097fb000,ffff80003c04b4f0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b9b2858,ffff80003c04b4f0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b9b2858,ffff80003c04b4f0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b9b2858,ffff80003c04b4f0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b9b2858,ffff80003c04b4f0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c04b4f0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c04b4f0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c04b4f0,ffff80002a31f3d0,ffff80002a31f320) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a31f3d0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a31f3d0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70690fccd950, count: -25