*cpu1: uvm_fault(0xfffff0806ccfc7c0, 0x98, 0, 1) -> e ddb{0}> show kasan No such command ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x780a3b5a6dd0, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800037f9dc30 rbx 0 rdx 0 rcx 0xffff800045feea78 rax 0x3b r8 0xffff800037f9db60 r9 0 r10 0x2219af5439f735a4 r11 0x95f50b2c6f753c73 r12 0 r13 0 r14 0xffff800045feea78 r15 0 rip 0xffffffff82f753ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff800037f9dbb0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{0}> show proc PROC (syz-executor) tid=455371 pid=1059 tcnt=2 stat=onproc flags process=0 proc=0 runpri=50, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800045fef770,0xffff800045feed20 process=0xffff80003c3d79e0 user=0xffff800037f98000, vmspace=0xfffff0806ccfc020 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 40122 109954 70716 0 2 0 0 syz-executor 53750 153547 42840 0 2 0 0 syz-executor 53750 422620 42840 0 7 0 0x4000000 syz-executor 48354 342599 10380 0 2 0 0 syz-executor * 1059 455371 36102 0 7 0 0 syz-executor 1059 188847 36102 0 3 0 0x4000080 fsleep syz-executor 98247 93309 57782 0 2 0 0 syz-executor 98247 158150 57782 0 2 0 0x4000000 syz-executor 5954 73574 50037 0 2 0 0 syz-executor 5954 181329 50037 0 3 0 0x4000080 fsleep syz-executor 89564 372674 38680 0 2 0 0 syz-executor 89564 180013 38680 0 3 0 0x4000080 lockf syz-executor 34215 111043 46743 0 2 0 0 syz-executor 34215 176896 46743 0 3 0 0x4000080 fifor syz-executor 50037 254903 1984 0 3 0x2 0x80 nanoslp syz-executor 10380 145805 1984 0 3 0x2 0x80 nanoslp syz-executor 36102 437470 1984 0 3 0x2 0x80 nanoslp syz-executor 42840 123521 1984 0 3 0x2 0x80 nanoslp syz-executor 38680 71501 1984 0 3 0x2 0x80 nanoslp syz-executor 57782 260700 1984 0 3 0x2 0x80 nanoslp syz-executor 46743 391965 1984 0 3 0x2 0x80 nanoslp syz-executor 70716 394007 1984 0 3 0x2 0x80 nanoslp syz-executor 1984 35483 17336 0 3 0x2 0x80 kqread syz-executor 17336 448098 47973 0 3 0x100002 0x88 sigsusp ksh 47973 159663 78967 0 3 0x10 0x88 kqread sshd-session 78967 308190 75841 0 3 0x12 0x80 kqread sshd-session 55187 496661 1 0 3 0x100003 0x80 ttyin getty 75841 278724 1 0 3 0 0x88 kqread sshd 17277 78206 77010 74 3 0x1100012 0x80 bpf pflogd 77010 314889 1 0 3 0 0x80 sbwait pflogd 81555 195535 23352 73 3 0x1100010 0x80 kqread syslogd 23352 478727 1 0 3 0x100002 0x80 sbwait syslogd 24960 491243 1 0 3 0x100000 0x80 kqread resolvd 88088 330861 46507 77 3 0x100012 0x80 kqread dhcpleased 17334 220284 46507 77 3 0x100012 0x80 kqread dhcpleased 46507 404689 1 0 3 0 0x80 kqread dhcpleased 18860 496194 0 0 3 0x14000 0x200 bored smr 6255 113402 0 0 2 0x14000 0x200 zerothread 12484 77950 0 0 3 0x14000 0x200 aiodoned aiodoned 63473 315384 0 0 3 0x14000 0x200 syncer update 92081 105976 0 0 3 0x14000 0x200 cleaner cleaner 28500 409700 0 0 3 0x14000 0x200 reaper reaper 76111 123830 0 0 3 0x14000 0x200 pgdaemon pagedaemon 87301 272959 0 0 3 0x14000 0x200 bored viomb 29537 16641 0 0 3 0x14000 0x40000200 acpi0 acpi0 88288 163432 0 0 3 0x14000 0x40000200 idle1 53337 296278 0 0 3 0x14000 0x200 bored softnet1 26551 271573 0 0 3 0x14000 0x200 bored softnet0 69641 39998 0 0 3 0x14000 0x200 smrbar systqmp 84035 301966 0 0 3 0x14000 0x200 bored systq 87982 31462 0 0 3 0x14000 0x200 tmoslp softclockmp 30155 339774 0 0 3 0x14000 0x40000200 tmoslp softclock 35723 389291 0 0 3 0x14000 0x40000200 idle0 1 389423 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &pmap->pm_mtx r = 0 (0xfffff0806ccfb610) #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 pmap_write_protect+0x80 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #2 pmap_write_protect+0x80 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline] #2 pmap_write_protect+0x80 sys/arch/amd64/amd64/pmap.c:2173 #3 uvm_map_protect+0xb95 pmap_protect sys/arch/amd64/compile/SYZKALLER/obj/machine/pmap.h:481 [inline] #3 uvm_map_protect+0xb95 sys/uvm/uvm_map.c:3202 #4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 Process 53750 (syz-executor) thread 0xffff800036f8c2c0 (422620) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a4dc00) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 Process 1059 (syz-executor) thread 0xffff800045feea78 (455371) exclusive rwlock uobjlk r = 0 (0xfffff0806ceaab10) #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 uvm_map_protect+0xb36 sys/uvm/uvm_map.c:3202 #3 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #5 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xfffff0806ccfc120) #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 uvm_map_protect+0xe0 sys/uvm/uvm_map.c:3075 #4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 exclusive mutex &pmap->pm_mtx r = 0 (0xfffff0806ccfb610) #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 pmap_write_protect+0x80 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #2 pmap_write_protect+0x80 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline] #2 pmap_write_protect+0x80 sys/arch/amd64/amd64/pmap.c:2173 #3 uvm_map_protect+0xb95 pmap_protect sys/arch/amd64/compile/SYZKALLER/obj/machine/pmap.h:481 [inline] #3 uvm_map_protect+0xb95 sys/uvm/uvm_map.c:3202 #4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 Process 69641 (systqmp) thread 0xffff800045ffe530 (39998) shared rwlock systqmp r = 0 (0xffffffff839bf5d8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11067 12215K 12223K 166960K 12175 0 pcb 17 12K 12K 166960K 26 0 rtable 240 7K 7K 166960K 372 0 pf 35 17K 18K 166960K 48 0 ifaddr 43 7K 7K 166960K 46 0 ifgroup 55 2K 2K 166960K 57 0 sysctl 1 1K 9K 166960K 5 0 counters 70 37K 37K 166960K 72 0 ioctlops 0 0K 4K 166960K 1489 0 iov 0 0K 0K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1292 81K 81K 166960K 1377 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 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 89K 166960K 170 0 sigio 0 0K 0K 166960K 1 0 proc 71 115K 164K 166960K 553 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 5 0 in_multi 99 6K 6K 166960K 100 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 5 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 55 254K 254K 166960K 55 0 exec 0 0K 1K 166960K 397 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 210 166K 177K 166960K 3515 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 43 86K 100K 166960K 1366 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 12 0K 2K 166960K 29 0 temp 34 9114K 9121K 166960K 4087 0 kqueue 13 20K 28K 166960K 37 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 28 0 0 1 0 1 1 0 8 0 rtpcb 120 40 0 36 1 0 1 1 0 8 0 rtentry 176 116 0 5 6 0 6 6 0 8 0 unpcb 144 56 0 37 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 16 0 11 1 0 1 1 0 8 0 arp 136 19 0 1 1 0 1 1 0 8 0 inpcb 328 92 0 83 2 0 2 2 0 8 0 nd6 152 25 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 1 0 1 1 0 1 1 0 8 1 pfstscr 40 2 0 0 1 0 1 1 0 8 0 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 3 0 3 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 pfrktable 1344 1 0 1 1 0 1 1 0 8 1 pfstitem 24 24 0 0 1 0 1 1 0 8 0 pfstkey 128 24 0 0 1 0 1 1 0 8 0 pfstate 448 23 0 0 3 0 3 3 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 487 0 28 31 0 31 31 0 8 1 art_table 40 488 0 28 5 0 5 5 0 8 0 art_node 32 116 0 11 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1615 0 146 92 0 92 92 0 8 0 ffsino 296 1615 0 146 114 0 114 114 0 8 0 nchpl 144 1856 0 157 64 0 64 64 0 8 0 vnodes 216 1714 0 0 96 0 96 96 0 8 0 namei 1024 5706 0 5706 2 0 2 2 0 8 2 percpumem 16 52 0 1 1 0 1 1 0 8 0 kstatmem 264 29 0 2 2 0 2 2 0 8 0 scxspl 216 6381 0 6381 4 2 2 3 1 8 2 plimitpl 152 31 0 14 1 0 1 1 0 8 0 sigapl 424 499 0 451 7 0 7 7 0 8 1 knotepl 120 73 0 0 3 0 3 3 0 8 0 kqueuepl 224 34 0 24 1 0 1 1 0 8 0 pipepl 344 135 0 108 3 0 3 3 0 8 0 fdescpl 528 483 0 451 3 0 3 3 0 8 0 filepl 160 1738 0 1520 10 0 10 10 0 8 0 lockfpl 104 22 0 16 1 0 1 1 0 8 0 lockfspl 48 11 0 6 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 32 0 15 1 0 1 1 0 8 0 ucredpl 104 118 0 105 1 0 1 1 0 8 0 zombiepl 144 451 0 451 1 0 1 1 0 8 1 processpl 1232 499 0 451 5 0 5 5 0 8 0 procpl 664 560 0 506 6 0 6 6 0 8 1 sockpl 752 190 0 158 4 0 4 4 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 0 mcl2k 2048 15 0 0 2 0 2 2 0 8 0 mextrefs 64 15 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 145 0 0 10 0 10 10 0 8 0 bufpl 272 2330 0 105 149 0 149 149 0 8 0 anonpl 32 3682 0 0 30 0 30 30 0 247 0 amapchunkpl 152 9338 0 8919 21 0 21 21 0 158 4 amappl16 200 1511 0 1489 5 0 5 5 0 8 3 amappl15 192 5 0 5 1 0 1 1 0 8 1 amappl14 184 440 0 439 1 0 1 1 0 8 0 amappl13 176 129 0 117 1 0 1 1 0 8 0 amappl12 168 753 0 724 2 0 2 2 0 8 0 amappl11 160 4 0 3 1 0 1 1 0 8 0 amappl10 152 63 0 49 1 0 1 1 0 8 0 amappl9 144 274 0 274 1 0 1 1 0 8 1 amappl8 136 106 0 104 1 0 1 1 0 8 0 amappl7 128 157 0 143 1 0 1 1 0 8 0 amappl6 120 158 0 157 1 0 1 1 0 8 0 amappl5 112 100 0 90 1 0 1 1 0 8 0 amappl4 104 311 0 289 1 0 1 1 0 8 0 amappl3 96 1675 0 1592 3 0 3 3 0 8 0 amappl2 88 610 0 535 2 0 2 2 0 8 0 amappl1 80 10692 0 10085 16 1 15 15 0 8 1 amappl 88 2748 0 2610 4 0 4 4 0 92 0 uvmvnodes 80 98 0 0 2 0 2 2 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 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 483 0 451 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 483 0 451 1 0 1 1 0 8 0 vmmpekpl 168 5997 0 5965 2 0 2 2 0 8 0 vmmpepl 168 40083 0 38171 89 1 88 88 0 357 4 vmsppl 488 482 0 451 5 0 5 5 0 8 1 rwobjpl 80 14691 0 13699 24 0 24 24 0 8 1 pdppl 4096 973 0 902 99 28 71 83 0 8 0 pvpl 32 9658 0 0 78 0 78 78 0 265 0 pmappl 256 482 0 451 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 420 0 31 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: 0x780a3b5a6dd0, count: -1 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff80002999dff0) 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:670 comcnputc(800,66) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,66) at comcnputc+0x250 sys/dev/ic/com.c:1274 cnputc(66) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(66) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834b0bef) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003c3d13b0) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff80003c3d13b0) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c3d13b0) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff800036f8c2c0,fffff0806758e7b8,ffff80003c3d1590) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimes(ffff800036f8c2c0,ffff80003c3d16e0,ffff80003c3d1630) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2733 end trace frame: 0xffff80003c3d16d0, count: 0 ddb{1}> trace x86_ipi_db(ffff80002999dff0) 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:670 comcnputc(800,66) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,66) at comcnputc+0x250 sys/dev/ic/com.c:1274 cnputc(66) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(66) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834b0bef) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003c3d13b0) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff80003c3d13b0) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c3d13b0) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff800036f8c2c0,fffff0806758e7b8,ffff80003c3d1590) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimes(ffff800036f8c2c0,ffff80003c3d16e0,ffff80003c3d1630) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2733 syscall(ffff80003c3d16e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3d16e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8121326b950, count: -16