*cpu1: uvm_fault(0xfffffd806afd49a8, 0x0, 0, 1) -> e ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x797b6d6d6a40, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a2b7660 rbx 0 rdx 0 rcx 0xffff80002a2b82b0 rax 0x34 r8 0xffff80002a2b7590 r9 0xffff80002a2b73fc r10 0xe318647e8d3a36a9 r11 0x5c7e99a7061f3e67 r12 0 r13 0 r14 0xffff80002a2b82b0 r15 0 rip 0xffffffff8229c3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a2b75e0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{0}> show proc PROC (syz-executor) tid=398754 pid=56897 tcnt=1 stat=onproc flags process=2 proc=0 runpri=79, usrpri=79, slppri=16, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2b8a78,0xffff80003ac282d0 process=0xffff80002a2c1398 user=0xffff80002a2b2000, vmspace=0xfffffd800b0fb010 estcpu=29, cpticks=1080, pctcpu=1.65, user=45, sys=995, intr=40 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 16159 518260 1272 0 2 0 syz-executor 16159 284264 1272 0 3 0x4000080 fsleep syz-executor 16159 473995 1272 0 3 0x4000080 fsleep syz-executor 94076 456490 4362 0 3 0x80 nanoslp syz-executor 94076 32835 4362 0 3 0x4000080 lockf syz-executor 94076 233900 4362 0 3 0x4000080 fsleep syz-executor 25237 192841 54178 0 2 0 syz-executor 25237 495371 54178 0 3 0x4000080 nanoslp syz-executor 25237 71369 54178 0 3 0x4000080 fsleep syz-executor 59080 224332 35639 0 3 0x80 nanoslp syz-executor 59080 102675 35639 0 3 0x4000080 pipewr syz-executor 59080 257671 35639 0 3 0x4000080 fsleep syz-executor 6269 273561 0 0 3 0x14200 acct acct 66837 395306 56897 0 3 0x2 biowait syz-executor 4362 440628 56897 0 3 0x82 nanoslp syz-executor 97312 257528 56897 0 3 0x82 nanoslp syz-executor 28310 514355 1 0 3 0x80 nanoslp init 13428 341629 56897 0 3 0x82 nanoslp syz-executor 35639 106904 56897 0 3 0x82 nanoslp syz-executor 1272 512791 56897 0 3 0x82 nanoslp syz-executor 72419 321744 56897 0 3 0x2 biowait syz-executor 54178 91331 56897 0 3 0x82 nanoslp syz-executor 78792 54825 0 0 3 0x14200 bored sosplice *56897 398754 38250 0 7 0x2 syz-executor 38250 7296 10929 0 3 0x10008a sigsusp ksh 10929 139349 36264 0 3 0x98 kqread sshd-session 36264 186712 83576 0 3 0x92 kqread sshd-session 83576 173839 1 0 3 0x88 kqread sshd 30774 452695 37952 74 3 0x1100092 bpf pflogd 37952 162749 1 0 3 0x80 sbwait pflogd 50913 420580 97413 73 3 0x1100090 kqread syslogd 97413 503575 1 0 3 0x100082 sbwait syslogd 49634 468130 1 0 3 0x100080 kqread resolvd 84576 78747 0 0 3 0x14200 bored smr 74357 355820 0 0 2 0x14200 zerothread 28430 82735 0 0 3 0x14200 aiodoned aiodoned 81847 34585 0 0 3 0x14200 syncer update 21225 447570 0 0 3 0x14200 cleaner cleaner 24103 130239 0 0 3 0x14200 reaper reaper 67973 405594 0 0 3 0x14200 pgdaemon pagedaemon 71874 313861 0 0 3 0x14200 bored viomb 37755 138842 0 0 3 0x40014200 acpi0 acpi0 92910 20867 0 0 3 0x40014200 idle1 42795 356855 0 0 3 0x14200 bored softnet7 83930 145727 0 0 3 0x14200 bored softnet6 28367 463629 0 0 3 0x14200 bored softnet5 40406 321729 0 0 3 0x14200 bored softnet4 23036 2674 0 0 3 0x14200 bored softnet3 11526 44878 0 0 3 0x14200 bored softnet2 91740 190339 0 0 3 0x14200 bored softnet1 4339 522885 0 0 3 0x14200 bored softnet0 56420 317003 0 0 3 0x14200 smrbar systqmp 31221 93585 0 0 3 0x14200 bored systq 2307 309263 0 0 3 0x14200 tmoslp softclockmp 52907 398383 0 0 3 0x40014200 tmoslp softclock 17334 22464 0 0 3 0x40014200 idle0 1 405895 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &kq->kq_lock r = 0 (0xfffffd806ef1d390) #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 kqueue_scan_finish+0xfd sys/kern/kern_event.c:1841 #4 dopselect+0x84e sys/kern/sys_generic.c:706 #5 sys_pselect+0x25a sys/kern/sys_generic.c:589 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #7 Xsyscall+0x128 Process 66837 (syz-executor) thread 0xffff80002a3142e8 (395306) Process 72419 (syz-executor) thread 0xffff8000ffff3a00 (321744) Process 56420 (systqmp) thread 0xffff8000ffffe298 (317003) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10269 11105K 12491K 166960K 17845 0 pcb 18 20K 28K 166960K 1906 0 rtable 261 18K 19K 166960K 1501 0 pf 44 19K 67488K 166960K 803 0 ifaddr 47 12K 13K 166960K 479 0 ifgroup 63 2K 3K 166960K 898 0 sysctl 4 1K 9K 166960K 65 0 counters 72 37K 38K 166960K 1008 0 ioctlops 0 0K 4K 166960K 3078 0 iov 0 0K 48K 166960K 522 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1519 96K 96K 166960K 7335 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 16K 24K 166960K 112 0 VM map 2 1K 1K 166960K 2 0 sem 17 60K 60K 166960K 292 0 dirhash 12 2K 3K 166960K 129 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 240K 166960K 7570 0 sigio 1 0K 0K 166960K 138 0 proc 61 83K 180K 166960K 1751 0 subproc 72 4K 4K 166960K 231 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 1116 0 in_multi 79 5K 7K 166960K 583 0 ether_multi 1 0K 0K 166960K 99 0 mrt 1 0K 0K 166960K 47 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 283 1261K 1261K 166960K 283 0 exec 0 0K 1K 166960K 1805 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 46 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 227 136K 179K 166960K 68047 0 UVM aobj 6 2K 2K 166960K 8 0 pinsyscall 34 68K 104K 166960K 9037 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 1K 166960K 431 0 NDP 14 0K 2K 166960K 367 0 temp 101 8652K 8908K 166960K 384080 0 kqueue 7 12K 34K 166960K 1496 0 SYN cache 2 8K 16K 166960K 3 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 120 827 0 826 7 6 1 3 0 8 0 rtentry 176 513 0 426 6 1 5 5 0 8 0 unpcb 144 6346 0 6335 45 39 6 6 0 8 5 syncache 336 5 0 5 2 2 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 2602 0 2595 37 35 2 7 0 8 1 arp 128 64 0 53 1 0 1 1 0 8 0 ipq 40 4 0 3 3 2 1 1 0 8 0 ipqe 40 4 0 3 3 2 1 1 0 8 0 inpcb 328 8599 0 8590 48 39 9 10 0 8 7 nd6 144 91 0 74 1 0 1 1 0 8 0 pkpcb 40 143 0 143 8 7 1 1 0 8 1 kcovpl 48 25 0 17 1 0 1 1 0 8 0 mppekey 1024 8 0 8 8 7 1 1 0 8 1 ppxss 1192 381 0 381 4 3 1 1 0 8 1 pppxif 1504 40 0 40 15 15 0 2 0 8 0 pfstscr 40 5 0 4 2 1 1 1 0 8 0 pffrag 232 18 0 18 1 1 0 1 0 482 0 pffrnode 88 17 0 17 1 1 0 1 0 8 0 pffrent 40 33 0 33 1 1 0 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 2 0 2 2 2 0 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pfstitem 24 149 0 134 1 0 1 1 0 8 0 pfstkey 128 168 0 152 3 0 3 3 0 8 0 pfstate 384 154 0 143 9 3 6 9 0 8 0 pfrule 1344 38 0 34 2 1 1 2 0 8 0 rttmr 136 11 0 11 7 7 0 1 0 8 0 art_heap8 4096 9 0 4 7 2 5 5 0 8 0 art_heap4 256 2085 0 1643 50 19 31 32 0 8 0 art_table 40 2094 0 1647 7 1 6 6 0 8 0 art_node 32 494 0 420 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 semupl 112 10 0 10 7 7 0 1 0 8 0 semapl 112 276 0 261 1 0 1 1 0 8 0 shmpl 112 5 0 2 1 0 1 1 0 8 0 dirhash 1024 96 0 79 3 0 3 3 0 8 0 dino2pl 256 16077 0 14527 98 0 98 98 0 8 0 ffsino 296 16077 0 14527 120 0 120 120 0 8 0 nchpl 144 26635 0 25992 64 39 25 64 0 8 0 rtmask 32 81 0 81 11 10 1 1 0 8 1 uvmvnodes 80 17598 0 0 360 0 360 360 0 8 0 vnodes 216 17598 0 0 978 0 978 978 0 8 0 namei 1024 91232 0 91231 9 8 1 2 0 8 0 percpumem 16 519 0 468 1 0 1 1 0 8 0 kstatmem 264 632 0 598 4 1 3 3 0 8 0 acpiwqpl 32 5 0 5 1 0 1 1 1 8 1 scsiplug 72 34 0 34 11 10 1 1 0 8 1 scxspl 216 186535 0 186533 27 25 2 8 1 8 1 plimitpl 152 1489 0 1470 1 0 1 1 0 8 0 sigapl 424 7829 0 7778 9 2 7 9 0 8 0 knotepl 120 982 0 0 24 0 24 24 0 8 0 kqueuepl 224 2941 0 2935 22 21 1 7 0 8 0 pipepl 344 1149 0 1121 19 13 6 9 0 8 2 fdescpl 528 7753 0 7726 3 0 3 3 0 8 0 filepl 160 55722 0 55463 44 25 19 19 0 8 5 lockfpl 104 3845 0 3842 7 6 1 2 0 8 0 lockfspl 48 1257 0 1255 1 0 1 1 0 8 0 sessionpl 144 42 0 35 1 0 1 1 0 8 0 pgrppl 48 149 0 134 1 0 1 1 0 8 0 ucredpl 104 9631 0 9621 1 0 1 1 0 8 0 zombiepl 144 8774 0 8772 1 0 1 1 0 8 0 processpl 1248 7829 0 7778 6 1 5 6 0 8 0 procpl 664 20400 0 20341 11 4 7 8 0 8 0 sosppl 168 67 0 67 11 10 1 1 0 8 1 sockpl 752 16164 0 16143 112 99 13 21 0 8 8 mcl64k 65536 19 0 0 3 1 2 3 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 133 0 0 17 1 16 17 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 142 0 0 9 0 9 9 0 8 0 mtagpl 96 13 0 0 1 0 1 1 0 8 0 mbufpl 256 2520 0 0 146 0 146 146 0 8 0 bufpl 280 75385 0 69242 440 0 440 440 0 8 0 anonpl 32 19810 0 0 159 1 158 158 0 246 0 amapchunkpl 152 240545 0 239898 88 54 34 40 0 158 6 amappl16 200 26733 0 26425 163 136 27 46 0 8 8 amappl15 192 14 0 14 4 4 0 1 0 8 0 amappl14 184 149 0 141 1 0 1 1 0 8 0 amappl13 176 11 0 11 2 1 1 1 0 8 1 amappl12 168 8669 0 8643 3 1 2 2 0 8 0 amappl11 160 51 0 43 1 0 1 1 0 8 0 amappl10 152 7 0 7 2 2 0 1 0 8 0 amappl9 144 251 0 251 1 1 0 1 0 8 0 amappl8 136 60 0 56 1 0 1 1 0 8 0 amappl7 128 208 0 199 1 0 1 1 0 8 0 amappl6 120 352 0 348 1 0 1 1 0 8 0 amappl5 112 193 0 185 1 0 1 1 0 8 0 amappl4 104 327 0 306 1 0 1 1 0 8 0 amappl3 96 50719 0 50617 4 0 4 4 0 8 0 amappl2 88 1042 0 996 2 0 2 2 0 8 0 amappl1 80 39130 0 38655 15 1 14 15 0 8 0 amappl 88 65747 0 65572 6 1 5 5 0 92 0 dma65536 65536 4 0 4 3 3 0 1 0 8 0 dma32768 32768 1 0 1 1 0 1 1 0 8 1 dma16384 16384 1 0 1 1 1 0 1 0 8 0 dma8192 8192 2 0 2 1 1 0 1 0 8 0 dma4096 4096 2 0 2 2 2 0 1 0 8 0 dma2048 2048 3 0 3 2 2 0 1 0 8 0 dma1024 1024 67 0 66 1 0 1 1 0 8 0 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 9 0 9 4 4 0 1 0 8 0 dma128 128 264 0 264 10 9 1 1 0 8 1 dma64 64 13 0 13 7 7 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 23 0 22 1 0 1 1 0 8 0 aobjpl 72 7 0 2 1 0 1 1 0 8 0 uaddrrnd 24 7753 0 7726 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 7753 0 7726 1 0 1 1 0 8 0 vmmpekpl 168 54010 0 53951 5 1 4 4 0 8 0 vmmpepl 168 485082 0 483145 202 88 114 118 0 357 17 vmsppl 488 7752 0 7726 6 1 5 5 0 8 0 rwobjpl 80 133552 0 114897 389 3 386 386 0 8 0 pdppl 4096 15513 0 15452 135 70 65 83 0 8 4 pvpl 32 27300 0 0 219 2 217 218 0 265 0 pmappl 256 7752 0 7726 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 545 0 159 12 0 12 12 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x797b6d6d6a40, 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:666 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,d) at comcnputc+0x29b sys/dev/ic/com.c:1269 db_putchar(a) at db_putchar+0x498 sys/ddb/db_output.c:168 kprintf() at kprintf+0x203 sys/kern/subr_prf.c:723 db_printf(ffffffff83313b06) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff833d88f1) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80002a383060,0) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff80002a383060) at kerntrap+0x198 sys/arch/amd64/amd64/trap.c:491 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001472000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 end trace frame: 0xffff80002a383190, 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:666 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,d) at comcnputc+0x29b sys/dev/ic/com.c:1269 db_putchar(a) at db_putchar+0x498 sys/ddb/db_output.c:168 kprintf() at kprintf+0x203 sys/kern/subr_prf.c:723 db_printf(ffffffff83313b06) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff833d88f1) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80002a383060,0) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff80002a383060) at kerntrap+0x198 sys/arch/amd64/amd64/trap.c:491 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001472000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(21e5f,81,2000,ffff80003ac287f0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff80003ac287f0) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002a383210) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8070b80130,81,fffffd80097fb820,ffff80003ac287f0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd807b4bb348,ffff80003ac287f0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd807b4bb348,ffff80003ac287f0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd807b4bb348,ffff80003ac287f0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd807b4bb348,ffff80003ac287f0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003ac287f0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003ac287f0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003ac287f0,ffff80002a383580,ffff80002a3834d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a383580) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a383580) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c9272740d10, count: -25