*cpu0: uvm_fault(0xfffff2007e1bb9a0, 0x0, 0, 1) -> e ddb{1}> show kasan No such command ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xc743ee18d60, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff800032fa2470 rbx 0 rdx 0xffff80000160d040 rcx 0xffff80002a2602b8 rax 0x33 r8 0xffff800032fa23a0 r9 0 r10 0x36fd24e9a89cbd1a r11 0xf358a89752fe7bb1 r12 0 r13 0 r14 0xffff80002a2602b8 r15 0 rip 0xffffffff8274e3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff800032fa23f0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=4512 pid=95962 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a260a80,0xffff80002a21b780 process=0xffff800045fed378 user=0xffff800032f9d000, vmspace=0xfffff2007e1bb3e8 estcpu=21, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 83313 85376 52168 0 2 0 0 syz-executor 83313 132909 52168 0 3 0 0x4000080 fsleep syz-executor 52418 317176 76765 0 2 0x100002 0 sh 47226 458679 35032 0 2 0 0 syz-executor 47226 438288 35032 0 3 0 0x4000080 fsleep syz-executor 74064 257245 62175 0 2 0 0 syz-executor 74064 448359 62175 0 3 0 0x4000080 fsleep syz-executor 95962 385975 93495 0 2 0 0 syz-executor *95962 4512 93495 0 7 0 0x4000000 syz-executor 95962 150344 93495 0 2 0 0x4000000 syz-executor 998 331902 77335 0 2 0 0 syz-executor 998 189307 77335 0 7 0 0x4000000 syz-executor 998 17238 77335 0 2 0 0x4000000 syz-executor 80849 465826 68672 0 2 0x2 0 syz-executor 76765 371867 68672 0 2 0x10000002 0 syz-executor 93495 477822 68672 0 3 0x2 0x80 nanoslp syz-executor 52168 271029 68672 0 3 0x2 0x80 nanoslp syz-executor 62175 119248 68672 0 3 0x2 0x80 nanoslp syz-executor 35032 272433 68672 0 3 0x2 0x80 nanoslp syz-executor 24623 468068 68672 0 3 0x2 0x80 nanoslp syz-executor 77335 81823 68672 0 3 0x2 0x80 nanoslp syz-executor 68672 379407 89260 0 3 0x2 0x80 kqread syz-executor 89260 34361 43523 0 3 0x100002 0x88 sigsusp ksh 43523 152294 75918 0 3 0x10 0x88 kqread sshd-session 75918 342655 44156 0 3 0x12 0x80 kqread sshd-session 44248 32077 1 0 3 0x100003 0x80 ttyin getty 44156 277039 1 0 3 0 0x88 kqread sshd 75270 352511 8994 74 3 0x1100012 0x80 bpf pflogd 8994 406376 1 0 3 0 0x80 sbwait pflogd 94044 191119 65972 73 3 0x1100010 0x80 kqread syslogd 65972 397273 1 0 3 0x100002 0x80 sbwait syslogd 51659 357386 1 0 3 0x100000 0x80 kqread resolvd 62422 192451 43616 77 3 0x100012 0x80 kqread dhcpleased 87060 311530 43616 77 3 0x100012 0x80 kqread dhcpleased 43616 112141 1 0 3 0 0x80 kqread dhcpleased 54804 123390 0 0 3 0x14000 0x200 bored smr 85139 295760 0 0 2 0x14000 0x200 zerothread 18470 270682 0 0 3 0x14000 0x200 aiodoned aiodoned 15762 196348 0 0 3 0x14000 0x200 syncer update 39225 32038 0 0 3 0x14000 0x200 cleaner cleaner 64696 72384 0 0 3 0x14000 0x200 reaper reaper 80156 155774 0 0 3 0x14000 0x200 pgdaemon pagedaemon 72306 312689 0 0 3 0x14000 0x200 bored viomb 49360 35694 0 0 3 0x14000 0x40000200 acpi0 acpi0 60084 390443 0 0 3 0x14000 0x40000200 idle1 64734 29286 0 0 3 0x14000 0x200 bored softnet1 85829 509339 0 0 3 0x14000 0x200 bored softnet0 67516 90955 0 0 3 0x14000 0x200 bored systqmp 44468 46328 0 0 3 0x14000 0x200 bored systq 22355 200020 0 0 3 0x14000 0x200 tmoslp softclockmp 61825 92920 0 0 3 0x14000 0x40000200 tmoslp softclock 30720 469723 0 0 3 0x14000 0x40000200 idle0 1 284035 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff83b3b490) #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+0x4b4 sys/kern/kern_lock.c:487 #2 yield+0x35 sys/kern/sched_bsd.c:321 #3 pool_get+0x27e sys/kern/subr_pool.c:595 #4 soalloc+0x69 sys/kern/uipc_socket.c:149 #5 socreate+0xee sys/kern/uipc_socket.c:206 #6 sys_socket+0x124 sys/kern/uipc_syscalls.c:102 #7 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 #8 Xsyscall+0x128 Process 52418 (sh) thread 0xffff80002a21b4d8 (317176) exclusive rwlock vmmaplk r = 0 (0xfffff2000b1f7a88) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5170 #3 uvmspace_fork+0x44 sys/uvm/uvm_map.c:3743 #4 process_new+0x583 sys/kern/kern_fork.c:282 #5 fork1+0x3f9 sys/kern/kern_fork.c:-1 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 #7 Xsyscall+0x128 Process 47226 (syz-executor) thread 0xffff80002a21a2b0 (458679) exclusive rrwlock inode r = 0 (0xfffff2006e12c678) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 uvn_io+0x411 sys/uvm/uvm_vnode.c:1226 #6 uvn_get+0x31d sys/uvm/uvm_vnode.c:1075 #7 uvm_fault_lower_io+0x2ce sys/uvm/uvm_fault.c:1612 #8 uvm_fault_lower+0x28d sys/uvm/uvm_fault.c:1381 #9 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #10 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:194 #11 usertrap+0x430 sys/arch/amd64/amd64/trap.c:648 #12 recall_trap+0x8 Process 998 (syz-executor) thread 0xffff80002a21afa8 (189307) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a5b8c0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 malloc+0xe3 sys/kern/kern_malloc.c:175 #3 sys_shmat+0x9c sys/kern/sysv_shm.c:-1 #4 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 #5 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11052 12084K 12095K 166960K 12158 0 pcb 17 12K 12K 166960K 21 0 rtable 193 5K 7K 166960K 355 0 pf 35 17K 24K 166960K 68 0 ifaddr 37 6K 7K 166960K 51 0 ifgroup 56 2K 2K 166960K 68 0 sysctl 1 1K 9K 166960K 5 0 counters 70 37K 37K 166960K 78 0 ioctlops 0 0K 4K 166960K 1484 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1292 81K 81K 166960K 1381 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 18 65K 85K 166960K 159 0 proc 70 115K 163K 166960K 566 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 2 0 in_multi 77 5K 6K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 37 175K 175K 166960K 37 0 exec 0 0K 1K 166960K 402 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 228 168K 175K 166960K 3331 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 43 86K 98K 166960K 1378 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 1 0 NDP 24 1K 2K 166960K 32 0 temp 34 9118K 9124K 166960K 3735 0 kqueue 13 20K 24K 166960K 32 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 28 0 0 1 0 1 1 0 8 0 rtpcb 120 35 0 32 1 0 1 1 0 8 0 rtentry 176 111 0 23 5 0 5 5 0 8 0 unpcb 144 61 0 44 1 0 1 1 0 8 0 syncache 336 7 0 7 1 1 0 1 0 8 0 tcpcb 736 15 0 10 1 0 1 1 0 8 0 arp 136 18 0 4 1 0 1 1 0 8 0 inpcb 328 84 0 74 2 0 2 2 0 8 0 nd6 152 24 0 6 1 0 1 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1192 2 0 2 1 0 1 1 0 8 1 pffrag 232 1 0 1 1 0 1 1 0 482 1 pffrnode 88 1 0 1 1 0 1 1 0 8 1 pffrent 40 2 0 2 1 0 1 1 0 8 1 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfanchor 1288 4 0 0 1 0 1 1 0 8 0 pfstitem 24 33 0 0 1 0 1 1 0 8 0 pfstkey 128 33 0 0 2 0 2 2 0 8 0 pfstate 448 33 0 0 4 0 4 4 0 8 0 pfrule 1360 21 0 15 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 452 0 88 29 0 29 29 0 8 2 art_table 40 453 0 88 5 0 5 5 0 8 0 art_node 32 111 0 31 1 0 1 1 0 8 0 shmpl 120 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1582 0 110 93 0 93 93 0 8 0 ffsino 296 1582 0 110 114 0 114 114 0 8 0 nchpl 144 1788 0 83 64 0 64 64 0 8 0 vnodes 216 1689 0 0 94 0 94 94 0 8 0 namei 1024 6437 0 6437 3 2 1 2 0 8 1 percpumem 16 55 0 4 1 0 1 1 0 8 0 kstatmem 264 35 0 8 2 0 2 2 0 8 0 scxspl 216 6208 0 6208 4 3 1 3 1 8 1 plimitpl 152 32 0 15 1 0 1 1 0 8 0 sigapl 424 485 0 437 6 0 6 6 0 8 0 knotepl 120 56 0 0 2 0 2 2 0 8 0 kqueuepl 224 30 0 21 1 0 1 1 0 8 0 pipepl 344 137 0 110 3 0 3 3 0 8 0 fdescpl 528 469 0 437 3 0 3 3 0 8 0 filepl 160 1751 0 1540 11 1 10 10 0 8 0 lockfpl 104 14 0 12 1 0 1 1 0 8 0 lockfspl 48 6 0 4 1 0 1 1 0 8 0 sessionpl 144 30 0 19 1 0 1 1 0 8 0 pgrppl 48 40 0 22 1 0 1 1 0 8 0 ucredpl 104 110 0 96 1 0 1 1 0 8 0 zombiepl 144 445 0 444 2 1 1 1 0 8 0 processpl 1240 485 0 437 5 1 4 5 0 8 0 procpl 664 514 0 459 5 0 5 5 0 8 0 sockpl 752 180 0 150 5 1 4 4 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 132 0 0 17 0 17 17 0 8 0 mcl2k 2048 16 0 0 2 0 2 2 0 8 0 mextrefs 64 13 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 157 0 0 10 0 10 10 0 8 0 bufpl 272 2296 0 105 147 0 147 147 0 8 0 anonpl 32 3712 0 0 30 0 30 30 0 247 0 amapchunkpl 152 8774 0 8320 18 0 18 18 0 158 0 amappl16 200 1376 0 1360 5 4 1 5 0 8 0 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 443 0 440 1 0 1 1 0 8 0 amappl13 176 137 0 125 1 0 1 1 0 8 0 amappl12 168 771 0 741 2 0 2 2 0 8 0 amappl11 160 2 0 2 1 1 0 1 0 8 0 amappl10 152 66 0 52 1 0 1 1 0 8 0 amappl9 144 278 0 278 1 1 0 1 0 8 0 amappl8 136 117 0 116 1 0 1 1 0 8 0 amappl7 128 157 0 143 1 0 1 1 0 8 0 amappl6 120 196 0 194 1 0 1 1 0 8 0 amappl5 112 125 0 115 1 0 1 1 0 8 0 amappl4 104 316 0 298 1 0 1 1 0 8 0 amappl3 96 1556 0 1466 4 1 3 3 0 8 0 amappl2 88 628 0 555 2 0 2 2 0 8 0 amappl1 80 13597 0 12995 16 2 14 16 0 8 1 amappl 88 2545 0 2390 4 0 4 4 0 92 0 uvmvnodes 80 100 0 0 3 0 3 3 0 8 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 468 0 437 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 468 0 437 1 0 1 1 0 8 0 vmmpekpl 168 6616 0 6567 3 0 3 3 0 8 0 vmmpepl 168 43844 0 41982 82 1 81 81 0 357 0 vmsppl 488 468 0 437 5 1 4 5 0 8 0 rwobjpl 80 17333 0 16328 23 1 22 23 0 8 0 pdppl 4096 943 0 874 107 36 71 81 0 8 2 pvpl 32 8660 0 0 71 1 70 71 0 265 0 pmappl 256 468 0 437 3 1 2 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 428 0 42 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff838f7ff0) 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_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:677 comcnputc(800,20) at comcnputc+0xd0 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,20) at comcnputc+0xd0 sys/dev/ic/com.c:1264 cnputc(20) at cnputc+0x67 sys/dev/cons.c:218 kputchar(20,5,0) at kputchar+0x2ed sys/kern/subr_prf.c:367 kprintf() at kprintf+0x223 sys/kern/subr_prf.c:723 printf(ffffffff8357b726) at printf+0x8b sys/kern/subr_prf.c:529 trap_print(ffff80003c3a88d0,6) at trap_print+0x70 sys/arch/amd64/amd64/trap.c:669 kerntrap(ffff80003c3a88d0) at kerntrap+0x2e6 sys/arch/amd64/amd64/trap.c:528 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b sys_shmat(ffff80002a21afa8,ffff80003c3a8af0,ffff80003c3a8a40) at sys_shmat+0x39d sys/kern/sysv_shm.c:283 syscall(ffff80003c3a8af0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3a8af0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 end trace frame: 0xffff80003c3a8b70, count: 0 ddb{0}> trace x86_ipi_db(ffffffff838f7ff0) 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_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:677 comcnputc(800,20) at comcnputc+0xd0 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,20) at comcnputc+0xd0 sys/dev/ic/com.c:1264 cnputc(20) at cnputc+0x67 sys/dev/cons.c:218 kputchar(20,5,0) at kputchar+0x2ed sys/kern/subr_prf.c:367 kprintf() at kprintf+0x223 sys/kern/subr_prf.c:723 printf(ffffffff8357b726) at printf+0x8b sys/kern/subr_prf.c:529 trap_print(ffff80003c3a88d0,6) at trap_print+0x70 sys/arch/amd64/amd64/trap.c:669 kerntrap(ffff80003c3a88d0) at kerntrap+0x2e6 sys/arch/amd64/amd64/trap.c:528 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b sys_shmat(ffff80002a21afa8,ffff80003c3a8af0,ffff80003c3a8a40) at sys_shmat+0x39d sys/kern/sysv_shm.c:283 syscall(ffff80003c3a8af0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3a8af0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x92ee76a4d20, count: -15 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0xc743ee18d60, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xc743ee18d60, count: -1