*cpu0: uvm_fault(0xfffffd806bd19980, 0xcfce0, 0, 2) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7cc6a3c42e30, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c417730 rbx 0 rdx 0 rcx 0xffff8000367f82c8 rax 0x3b r8 0xffff80003c417660 r9 0x1 r10 0xf135a66521c135ad r11 0x5618907bb0b76505 r12 0 r13 0 r14 0xffff8000367f82c8 r15 0 rip 0xffffffff818253ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c4176b0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=418883 pid=38900 tcnt=3 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000367f9748,0xffff8000367f94c8 process=0xffff80003c487a48 user=0xffff80003c412000, vmspace=0xfffffd806bd19020 estcpu=36, cpticks=5, pctcpu=0.0, user=1, sys=4, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 40911 33871 2998 0 2 0 syz-executor 38698 367762 3693 0 2 0 syz-executor 38698 449624 3693 0 2 0x4000000 syz-executor 38698 283715 3693 0 7 0x4000000 syz-executor *38900 418883 54780 0 7 0 syz-executor 38900 302243 54780 0 3 0x4000080 fsleep syz-executor 38900 346506 54780 0 3 0x4000080 fsleep syz-executor 81433 266420 17259 0 2 0 syz-executor 81433 34573 17259 0 3 0x4000080 netcon syz-executor 92777 350503 73044 0 2 0 syz-executor 92777 371548 73044 0 3 0x4000080 kqsel syz-executor 92777 357293 73044 0 3 0x4000080 kqread syz-executor 92777 46405 73044 0 3 0x4000080 fsleep syz-executor 55425 41185 32271 0 3 0x80 nanoslp syz-executor 55425 326661 32271 0 3 0x4000080 pipewr syz-executor 80434 374424 0 0 3 0x14200 acct acct 2998 162020 68219 0 3 0x82 nanoslp syz-executor 92097 21564 0 0 3 0x14200 bored sosplice 58862 247623 93379 0 3 0x82 sbwait sshd-session 31562 287955 0 0 3 0x14280 nfsidl nfsio 1818 195946 0 0 3 0x14280 nfsidl nfsio 93248 379003 0 0 3 0x14280 nfsidl nfsio 75070 475955 0 0 3 0x14280 nfsidl nfsio 12449 149184 0 0 3 0x14280 nfsidl nfsio 15224 50872 0 0 3 0x14280 nfsidl nfsio 56209 274883 0 0 3 0x14280 nfsidl nfsio 38819 430332 0 0 3 0x14280 nfsidl nfsio 52790 70799 0 0 3 0x14280 nfsidl nfsio 17089 127740 0 0 3 0x14280 nfsidl nfsio 31480 445949 0 0 3 0x14280 nfsidl nfsio 57129 233839 0 0 3 0x14280 nfsidl nfsio 98243 355957 0 0 3 0x14280 nfsidl nfsio 52249 105278 0 0 3 0x14280 nfsidl nfsio 75514 473842 0 0 3 0x14280 nfsidl nfsio 22184 92940 0 0 3 0x14280 nfsidl nfsio 48791 166565 0 0 3 0x14280 nfsidl nfsio 57080 510141 0 0 3 0x14280 nfsidl nfsio 560 369204 0 0 3 0x14280 nfsidl nfsio 49145 107484 0 0 3 0x14280 nfsidl nfsio 17259 141751 68219 0 3 0x82 nanoslp syz-executor 60235 471750 68219 0 3 0x82 nanoslp syz-executor 54780 135323 68219 0 3 0x82 nanoslp syz-executor 81464 373112 68219 0 3 0x2 biowait syz-executor 32271 325392 68219 0 2 0xc82 syz-executor 3693 320351 68219 0 2 0xc82 syz-executor 73044 415065 68219 0 3 0x82 nanoslp syz-executor 68219 98195 41258 0 2 0x2 syz-executor 41258 326883 26820 0 3 0x10008a sigsusp ksh 26820 380827 60918 0 3 0x98 kqread sshd-session 60918 497881 93379 0 3 0x92 kqread sshd-session 34937 57444 1 0 3 0x100083 ttyin getty 93379 345998 1 0 3 0x88 kqread sshd 331 426782 92844 74 3 0x1100092 bpf pflogd 92844 87663 1 0 3 0x80 sbwait pflogd 5516 275277 52568 73 3 0x1100090 kqread syslogd 52568 184684 1 0 3 0x100082 sbwait syslogd 62113 520862 1 0 3 0x100080 kqread resolvd 24596 113573 66153 77 3 0x100092 kqread dhcpleased 83627 196986 66153 77 3 0x100092 kqread dhcpleased 66153 197683 1 0 3 0x80 kqread dhcpleased 85756 476682 0 0 2 0x40014200 smr 57103 437926 0 0 2 0x14200 zerothread 79838 76026 0 0 3 0x14200 aiodoned aiodoned 93136 156727 0 0 3 0x14200 syncer update 20510 132214 0 0 3 0x14200 cleaner cleaner 91996 231226 0 0 3 0x14200 reaper reaper 6741 48712 0 0 3 0x14200 pgdaemon pagedaemon 55984 260170 0 0 3 0x14200 bored viomb 7153 156382 0 0 3 0x40014200 acpi0 acpi0 76791 264805 0 0 3 0x40014200 idle1 4373 252750 0 0 3 0x14200 bored softnet3 52260 447440 0 0 3 0x14200 bored softnet2 26213 3963 0 0 3 0x14200 bored softnet1 56138 433004 0 0 2 0x14200 softnet0 57882 52960 0 0 3 0x14200 bored systqmp 98314 506939 0 0 3 0x14200 bored systq 87470 219128 0 0 2 0x14200 softclockmp 96843 16411 0 0 3 0x40014200 tmoslp softclock 11449 120850 0 0 3 0x40014200 idle0 1 458391 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &newfdp->fd_fd.fd_fplock r = 0 (0xffff80002a2ae0a0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:296 #2 mtx_enter+0x62 sys/kern/kern_lock.c:253 #3 fd_getfile+0x6d sys/kern/kern_descrip.c:237 #4 kqueue_register+0x291 sys/kern/kern_event.c:-1 #5 pselregister+0x135 sys/kern/sys_generic.c:760 #6 dopselect+0x503 sys/kern/sys_generic.c:653 #7 sys_pselect+0x263 sys/kern/sys_generic.c:589 #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 Process 81464 (syz-executor) thread 0xffff80002a2ad208 (373112) exclusive rrwlock inode r = 0 (0xfffffd806f6e9ad8) #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 vget+0x2bd sys/kern/vfs_subr.c:693 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #13 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c35a1f8) #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 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10224 11186K 12389K 166960K 12167 0 pcb 18 13K 13K 166960K 64 0 rtable 217 8K 9K 166960K 419 0 pf 40 18K 20K 166960K 108 0 ifaddr 40 6K 7K 166960K 61 0 ifgroup 59 2K 2K 166960K 83 0 sysctl 1 1K 9K 166960K 6 0 counters 70 37K 37K 166960K 94 0 ioctlops 0 0K 4K 166960K 1629 0 iov 0 0K 12K 166960K 45 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1435 90K 91K 166960K 1835 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 20 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 388 0 sigio 0 0K 0K 166960K 4 0 proc 72 91K 140K 166960K 576 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 25 0 in_multi 84 6K 7K 166960K 118 0 ether_multi 1 0K 0K 166960K 1 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 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 406 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 243 152K 161K 166960K 5166 0 UVM aobj 8 2K 2K 166960K 9 0 pinsyscall 44 88K 101K 166960K 1500 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 15 0K 2K 166960K 39 0 temp 45 8688K 8754K 166960K 8807 0 kqueue 16 22K 26K 166960K 71 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 176 127 0 31 6 0 6 6 0 8 0 unpcb 144 272 0 252 4 0 4 4 0 8 3 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 808 247 0 238 8 0 8 8 0 8 7 arp 128 21 0 4 1 0 1 1 0 8 0 inpcb 328 455 0 443 7 0 7 7 0 8 5 nd6 144 29 0 9 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 9 0 9 1 0 1 1 0 8 1 pppxif 1504 2 0 2 1 0 1 1 0 8 1 pffrag 232 2 0 1 1 0 1 1 0 482 0 pffrnode 88 2 0 1 1 0 1 1 0 8 0 pffrent 40 4 0 3 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 1 0 0 1 0 1 1 0 8 0 pfstitem 24 41 0 0 1 0 1 1 0 8 0 pfstkey 128 41 0 0 2 0 2 2 0 8 0 pfstate 384 41 0 0 5 0 5 5 0 8 0 pfrule 1344 26 0 18 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 543 0 118 29 0 29 29 0 8 2 art_table 32 544 0 118 4 0 4 4 0 8 0 art_node 16 126 0 39 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 2 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 18 0 8 1 0 1 1 0 8 0 shmpl 112 6 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2109 0 599 95 0 95 95 0 8 0 ffsino 288 2109 0 599 109 0 109 109 0 8 0 nchpl 144 2625 0 934 64 0 64 64 0 8 0 uvmvnodes 80 2484 0 0 51 0 51 51 0 8 0 vnodes 216 2484 0 0 138 0 138 138 0 8 0 namei 1024 12923 0 12923 1 0 1 1 0 8 1 percpumem 16 62 0 12 1 0 1 1 0 8 0 kstatmem 264 46 0 16 3 0 3 3 0 8 1 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 7902 0 7901 4 3 1 3 1 8 0 plimitpl 152 57 0 40 1 0 1 1 0 8 0 sigapl 424 709 0 637 9 0 9 9 0 8 0 knotepl 120 337 0 0 11 0 11 11 0 8 0 kqueuepl 224 160 0 148 5 0 5 5 0 8 4 pipepl 336 154 0 127 5 0 5 5 0 8 2 fdescpl 520 668 0 636 3 0 3 3 0 8 0 filepl 160 3921 0 3696 17 0 17 17 0 8 5 lockfpl 104 78 0 76 1 0 1 1 0 8 0 lockfspl 48 33 0 31 1 0 1 1 0 8 0 sessionpl 144 24 0 14 1 0 1 1 0 8 0 pgrppl 48 38 0 20 1 0 1 1 0 8 0 ucredpl 104 567 0 554 1 0 1 1 0 8 0 zombiepl 144 638 0 637 1 0 1 1 0 8 0 processpl 1240 709 0 637 6 0 6 6 0 8 0 procpl 656 1142 0 1061 8 0 8 8 0 8 0 srpgc 96 4 0 4 1 0 1 1 0 8 1 sockpl 728 788 0 751 10 0 10 10 0 8 6 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 1 mcl2k 2048 31 0 0 4 0 4 4 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 188 0 0 12 0 12 12 0 8 0 bufpl 280 3747 0 123 259 0 259 259 0 8 0 anonpl 32 7645 0 0 62 0 62 62 0 246 0 amapchunkpl 152 15736 0 15181 26 0 26 26 0 158 2 amappl16 200 2550 0 2454 15 4 11 15 0 8 5 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 115 0 102 1 0 1 1 0 8 0 amappl13 176 9 0 9 1 1 0 1 0 8 0 amappl12 168 1320 0 1289 3 1 2 2 0 8 0 amappl11 160 49 0 35 1 0 1 1 0 8 0 amappl10 152 9 0 8 1 0 1 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 128 107 0 93 1 0 1 1 0 8 0 amappl6 120 184 0 180 1 0 1 1 0 8 0 amappl5 112 124 0 115 1 0 1 1 0 8 0 amappl4 104 313 0 294 1 0 1 1 0 8 0 amappl3 96 2826 0 2716 4 0 4 4 0 8 0 amappl2 88 658 0 589 2 0 2 2 0 8 0 amappl1 80 9531 0 8832 16 1 15 15 0 8 0 amappl 88 4447 0 4279 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 128 254 0 254 2 1 1 1 0 8 1 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 8 0 1 1 0 1 1 0 8 0 uaddrrnd 24 668 0 636 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 668 0 636 1 0 1 1 0 8 0 vmmpekpl 168 7183 0 7140 3 0 3 3 0 8 0 vmmpepl 168 48679 0 46489 105 0 105 105 0 357 7 vmsppl 480 667 0 636 5 0 5 5 0 8 0 rwobjpl 72 18203 0 14604 66 0 66 66 0 8 0 pdppl 4096 1343 0 1272 99 24 75 83 0 8 4 pvpl 32 16074 0 0 131 1 130 130 0 265 0 pmappl 256 667 0 636 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 391 0 26 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff838a4ff0) 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(ffffffff838e99e8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:129 [inline] __mp_lock(ffffffff838e99e8) at __mp_lock+0x192 sys/kern/kern_lock.c:160 intr_handler(ffff80003c4e6900,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xspllower() at Xspllower+0x1d cnputc(75) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(75) at db_putchar+0x65c sys/ddb/db_output.c:155 kprintf() at kprintf+0x2aba sys/kern/subr_prf.c:1065 db_printf(ffffffff83409e9d) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff833b044b) at fault+0xa7 sys/arch/amd64/amd64/trap.c:157 kpageflttrap(ffff80003c4e6db0,cfce0) at kpageflttrap+0x385 sys/arch/amd64/amd64/trap.c:290 kerntrap(ffff80003c4e6db0) at kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332 end trace frame: 0xffff80003c4e6e30, count: 0 ddb{0}> trace x86_ipi_db(ffffffff838a4ff0) 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(ffffffff838e99e8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:129 [inline] __mp_lock(ffffffff838e99e8) at __mp_lock+0x192 sys/kern/kern_lock.c:160 intr_handler(ffff80003c4e6900,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f Xspllower() at Xspllower+0x1d cnputc(75) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(75) at db_putchar+0x65c sys/ddb/db_output.c:155 kprintf() at kprintf+0x2aba sys/kern/subr_prf.c:1065 db_printf(ffffffff83409e9d) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff833b044b) at fault+0xa7 sys/arch/amd64/amd64/trap.c:157 kpageflttrap(ffff80003c4e6db0,cfce0) at kpageflttrap+0x385 sys/arch/amd64/amd64/trap.c:290 kerntrap(ffff80003c4e6db0) at kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x57 syscall(ffff80003c4e7200) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4e7200) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9e2b6ff0750, count: -18 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7cc6a3c42e30, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7cc6a3c42e30, count: -1