*cpu0: uvm_fault(0xfffffd806894e180, 0x668, 0, 2) -> e ddb{1}> trace proc_trampoline() at proc_trampoline+0xdc end of kernel end trace frame: 0x204243bf7c0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff8000242b6960 rbx 0 rdx 0 rcx 0 rax 0x2a r8 0xffff8000242b6890 r9 0 r10 0x175c74c09007d433 r11 0xec8cdc846ccdf53c r12 0 r13 0 r14 0 r15 0 rip 0xffffffff8194e50c proc_trampoline+0xdc cs 0x8 rflags 0x246 rsp 0xffff8000242b68e0 ss 0 proc_trampoline+0xdc: movl $0,%gs:0x538 ddb{1}> show proc PROC (syz-executor.2) pid=149876 stat=onproc flags process=0 proc=4000000 pri=51, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000211eea80,0xffffffff8293ceb0 process=0xffff8000ffffa998 user=0xffff8000242b1000, vmspace=0xfffffd806894e010 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 55521 457727 97354 0 2 0 syz-executor.2 *55521 149876 97354 0 7 0x4000000 syz-executor.2 3292 120721 54517 0 2 0 syz-executor.0 3292 107001 54517 0 3 0x4000080 pipewr syz-executor.0 50088 409606 24616 0 2 0 syz-executor.1 50088 294474 24616 0 7 0x4000000 syz-executor.1 81410 260817 32698 0 2 0x2 syz-executor.3 97354 415714 32698 0 3 0x82 nanoslp syz-executor.2 24616 186187 32698 0 3 0x82 nanoslp syz-executor.1 54517 350641 32698 0 3 0x82 nanoslp syz-executor.0 32698 254644 23269 0 3 0x82 thrsleep syz-fuzzer 32698 404526 23269 0 3 0x4000082 nanoslp syz-fuzzer 32698 407327 23269 0 2 0x4000002 syz-fuzzer 32698 323204 23269 0 3 0x4000082 thrsleep syz-fuzzer 32698 214665 23269 0 3 0x4000082 thrsleep syz-fuzzer 32698 72509 23269 0 3 0x4000082 thrsleep syz-fuzzer 32698 344533 23269 0 3 0x4000082 nanoslp syz-fuzzer 23269 47424 3394 0 3 0x10008a sigsusp ksh 3394 202709 55055 0 3 0x9a poll sshd 61266 229280 1 0 3 0x100083 ttyin getty 55055 173084 1 0 3 0x88 poll sshd 1000 211928 77763 74 3 0x100092 bpf pflogd 77763 164230 1 0 3 0x80 netio pflogd 19330 230846 43431 73 3 0x100090 kqread syslogd 43431 61545 1 0 3 0x100082 netio syslogd 29 227439 1 0 3 0x100080 kqread resolvd 47206 113915 21198 77 3 0x100092 kqread dhcpleased 44467 506903 21198 77 3 0x100092 kqread dhcpleased 21198 95870 1 0 3 0x80 kqread dhcpleased 33738 336452 0 0 3 0x14200 bored smr 73239 180830 0 0 2 0x14200 zerothread 67021 112338 0 0 3 0x14200 aiodoned aiodoned 66638 26475 0 0 3 0x14200 syncer update 42950 356113 0 0 3 0x14200 cleaner cleaner 37270 416423 0 0 3 0x14200 reaper reaper 30388 204850 0 0 3 0x14200 pgdaemon pagedaemon 30964 211038 0 0 3 0x14200 bored viomb 96273 96211 0 0 3 0x40014200 acpi0 acpi0 64577 432128 0 0 3 0x40014200 idle1 82490 139820 0 0 3 0x14200 bored softnet 58741 347803 0 0 3 0x14200 bored systqmp 59148 140220 0 0 3 0x14200 bored systq 25811 193853 0 0 3 0x40014200 bored softclock 28963 452507 0 0 3 0x40014200 idle0 1 382193 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd807f0009c0) #0 witness_lock+0x44d #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pmap_enter+0x1af rcr3 machine/cpufunc.h:141 [inline] #3 pmap_enter+0x1af pmap_map_ptes sys/arch/amd64/amd64/pmap.c:414 [inline] #3 pmap_enter+0x1af sys/arch/amd64/amd64/pmap.c:2691 #4 uvm_fault_lower+0x77c sys/uvm/uvm_fault.c:1482 #5 uvm_fault+0x248 #6 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #7 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 #8 recall_trap+0x8 Process 55521 (syz-executor.2) thread 0xffff8000211ef7a0 (149876) exclusive rwlock amaplk r = 0 (0xfffffd806903a748) #0 witness_lock+0x44d #1 uvm_fault_check+0x3ca sys/uvm/uvm_fault.c:774 #2 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #3 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #4 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806894e028) #0 witness_lock+0x44d #1 uvmfault_lookup+0xe9 sys/uvm/uvm_fault.c:1744 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #4 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #5 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 #6 recall_trap+0x8 exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd807f0009c0) #0 witness_lock+0x44d #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pmap_enter+0x1af rcr3 machine/cpufunc.h:141 [inline] #3 pmap_enter+0x1af pmap_map_ptes sys/arch/amd64/amd64/pmap.c:414 [inline] #3 pmap_enter+0x1af sys/arch/amd64/amd64/pmap.c:2691 #4 uvm_fault_lower+0x77c sys/uvm/uvm_fault.c:1482 #5 uvm_fault+0x248 #6 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #7 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 #8 recall_trap+0x8 Process 50088 (syz-executor.1) thread 0xffff8000211ee2a0 (294474) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff828f9c10) #0 witness_lock+0x44d #1 syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 #2 Xsyscall+0x128 Process 81410 (syz-executor.3) thread 0xffff8000211eed20 (260817) exclusive rrwlock inode r = 0 (0xfffffd8069c36e70) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vget+0x1d3 sys/kern/vfs_subr.c:677 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1318 #8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6e5 sys/kern/vfs_lookup.c:561 #11 namei+0x36a sys/kern/vfs_lookup.c:245 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1849 #13 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806a654c48) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1849 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10157 6465K 6465K 78643K 11247 0 pcb 13 8K 8K 78643K 13 0 rtable 150 4K 4K 78643K 232 0 ifaddr 58 13K 13K 78643K 60 0 counters 48 34K 34K 78643K 48 0 ioctlops 0 0K 4K 78643K 1483 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1232 77K 77K 78643K 1237 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 9 29K 49K 78643K 71 0 proc 67 87K 111K 78643K 393 0 subproc 52 3K 3K 78643K 52 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 55 3K 3K 78643K 55 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 25 122K 122K 78643K 25 0 exec 0 0K 2K 78643K 448 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 189 39K 40K 78643K 2200 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 16 1K 1K 78643K 16 0 temp 57 4187K 4251K 78643K 3545 0 kqueue 10 14K 14K 78643K 10 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 25 0 22 1 0 1 1 0 8 0 rtentry 112 67 0 1 2 0 2 2 0 8 0 unpcb 136 35 0 20 1 0 1 1 0 8 0 syncache 296 4 0 4 1 0 1 1 0 8 1 tcpcb 736 7 0 3 1 0 1 1 0 8 0 arp 120 10 0 0 1 0 1 1 0 8 0 inpcb 304 45 0 38 1 0 1 1 0 8 0 nd6 48 12 0 0 1 0 1 1 0 8 0 kcovpl 48 4 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 11 0 0 1 0 1 1 0 8 0 pfstkey 112 11 0 0 1 0 1 1 0 8 0 pfstate 320 11 0 0 1 0 1 1 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 276 0 0 18 0 18 18 0 8 0 art_table 32 277 0 0 3 0 3 3 0 8 0 art_node 16 66 0 6 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1445 0 30 89 0 89 89 0 8 0 ffsino 272 1445 0 30 95 0 95 95 0 8 0 nchpl 144 1674 0 48 61 0 61 61 0 8 0 uvmvnodes 80 1507 0 0 31 0 31 31 0 8 0 vnodes 224 1507 0 0 89 0 89 89 0 8 0 namei 1024 4893 0 4893 1 0 1 1 0 8 1 percpumem 16 36 0 0 1 0 1 1 0 8 0 scxspl 216 4884 0 4884 2 1 1 2 0 8 1 plimitpl 152 19 0 8 1 0 1 1 0 8 0 sigapl 424 309 0 273 5 0 5 5 0 8 0 futexpl 64 8 0 8 1 0 1 1 0 8 1 knotepl 112 64 0 0 2 0 2 2 0 8 0 kqueuepl 216 6 0 0 1 0 1 1 0 8 0 pipepl 336 89 0 72 2 0 2 2 0 8 0 fdescpl 496 295 0 273 4 0 4 4 0 8 0 filepl 152 1290 0 1137 6 0 6 6 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 20 0 7 1 0 1 1 0 8 0 pgrppl 48 20 0 7 1 0 1 1 0 8 0 ucredpl 96 60 0 48 1 0 1 1 0 8 0 zombiepl 144 273 0 273 1 0 1 1 0 8 1 processpl 1064 309 0 273 3 0 3 3 0 8 0 procpl 672 320 0 275 4 0 4 4 0 8 0 sockpl 480 105 0 80 4 0 4 4 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 91 0 0 11 0 11 11 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 192 0 0 12 0 12 12 0 8 0 bufpl 288 3567 0 141 245 0 245 245 0 8 0 anonpl 24 46476 0 40675 41 4 37 37 0 186 1 amapchunkpl 152 4804 0 4373 20 0 20 20 0 158 1 amappl16 200 278 0 183 6 0 6 6 0 8 0 amappl15 192 2 0 0 1 0 1 1 0 8 0 amappl14 184 7 0 4 1 0 1 1 0 8 0 amappl13 176 43 0 41 1 0 1 1 0 8 0 amappl12 168 40 0 33 1 0 1 1 0 8 0 amappl11 160 57 0 41 1 0 1 1 0 8 0 amappl10 152 58 0 49 1 0 1 1 0 8 0 amappl9 144 493 0 487 1 0 1 1 0 8 0 amappl8 136 343 0 324 1 0 1 1 0 8 0 amappl7 128 75 0 66 1 0 1 1 0 8 0 amappl6 120 163 0 144 1 0 1 1 0 8 0 amappl5 112 165 0 147 1 0 1 1 0 8 0 amappl4 104 604 0 583 1 0 1 1 0 8 0 amappl3 96 162 0 144 1 0 1 1 0 8 0 amappl2 88 363 0 322 2 0 2 2 0 8 1 amappl1 80 8505 0 8016 13 0 13 13 0 8 2 amappl 88 1881 0 1728 4 0 4 4 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 295 0 273 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 295 0 273 1 0 1 1 0 8 0 vmmpekpl 168 6702 0 6662 2 0 2 2 0 8 0 vmmpepl 168 29375 0 27848 70 0 70 70 0 357 0 vmsppl 368 294 0 273 3 0 3 3 0 8 0 rwobjpl 56 10161 0 7777 36 0 36 36 0 8 0 pdppl 4096 598 0 546 74 12 62 62 0 8 10 pvpl 32 172242 0 162862 141 0 141 141 0 265 63 pmappl 248 294 0 273 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 562 0 15 16 0 16 16 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff82779ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x28 sys/arch/amd64/amd64/bus_space.c:639 comcnputc(800,20) at comcnputc+0x97 sys/dev/ic/com.c:1259 cnputc(20) at cnputc+0x4b sys/dev/cons.c:239 db_putchar(2d) at db_putchar+0x316 db_force_whitespace sys/ddb/db_output.c:102 [inline] db_putchar(2d) at db_putchar+0x316 sys/ddb/db_output.c:153 kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1068 db_printf(ffffffff824fe220) at db_printf+0x85 sys/kern/subr_prf.c:502 fault(ffffffff824b579c) at fault+0x95 sys/arch/amd64/amd64/trap.c:154 kpageflttrap(ffff800027af01d0,668) at kpageflttrap+0x25a sys/arch/amd64/amd64/trap.c:275 kerntrap(ffff800027af01d0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b pppacopen(86353,1,2000,ffff8000211ee2a0) at pppacopen+0x1b5 sys/net/if_pppx.c:1020 end trace frame: 0xffff800027af0340, count: 0 ddb{0}> trace x86_ipi_db(ffffffff82779ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x28 sys/arch/amd64/amd64/bus_space.c:639 comcnputc(800,20) at comcnputc+0x97 sys/dev/ic/com.c:1259 cnputc(20) at cnputc+0x4b sys/dev/cons.c:239 db_putchar(2d) at db_putchar+0x316 db_force_whitespace sys/ddb/db_output.c:102 [inline] db_putchar(2d) at db_putchar+0x316 sys/ddb/db_output.c:153 kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1068 db_printf(ffffffff824fe220) at db_printf+0x85 sys/kern/subr_prf.c:502 fault(ffffffff824b579c) at fault+0x95 sys/arch/amd64/amd64/trap.c:154 kpageflttrap(ffff800027af01d0,668) at kpageflttrap+0x25a sys/arch/amd64/amd64/trap.c:275 kerntrap(ffff800027af01d0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b pppacopen(86353,1,2000,ffff8000211ee2a0) at pppacopen+0x1b5 sys/net/if_pppx.c:1020 spec_open(ffff800027af0358) at spec_open+0x3d7 sys/kern/spec_vnops.c:157 VOP_OPEN(fffffd80695b76b8,1,fffffd807f7d7480,ffff8000211ee2a0) at VOP_OPEN+0x75 sys/kern/vfs_vops.c:138 vn_open(ffff800027af05a8,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:183 doopenat(ffff8000211ee2a0,ffffff9c,20000780,0,0,ffff800027af0790) at doopenat+0x26a sys/kern/vfs_syscalls.c:1128 syscall(ffff800027af0800) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800027af0800) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x21501e0b630, count: -20 ddb{0}> machine ddbcpu 1 Stopped at proc_trampoline+0xdc: movl $0,%gs:0x538 proc_trampoline() at proc_trampoline+0xdc end of kernel end trace frame: 0x204243bf7c0, count: 14 ddb{1}> trace proc_trampoline() at proc_trampoline+0xdc end of kernel end trace frame: 0x204243bf7c0, count: -1