*cpu0: uvm_fault(0xfffffd805c7a5030, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7f91a353080, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c459630 rbx 0 rdx 0 rcx 0xffff80003c447780 rax 0x3b r8 0xffff80003c459560 r9 0x1 r10 0x578089ef4c04354b r11 0x1c7e11984f0e0235 r12 0 r13 0 r14 0xffff80003c447780 r15 0 rip 0xffffffff8163a3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c4595b0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=29252 pid=98042 tcnt=3 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c446a88,0xffff80003c4c1278 process=0xffff80002a2a70d0 user=0xffff80003c454000, vmspace=0xfffffd805c7a55e8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 949 129135 10265 0 2 0 syz-executor 949 302949 10265 0 2 0x4000000 syz-executor 949 453978 10265 0 3 0x4000080 fsleep syz-executor 97474 454430 39760 0 2 0 syz-executor 97474 287167 39760 0 3 0x4000080 sbwait syz-executor 97474 57790 39760 0 3 0x4000080 fsleep syz-executor 98042 75050 59440 0 2 0x10 syz-executor 98042 124414 59440 0 2 0x4000010 syz-executor *98042 29252 59440 0 7 0x4000010 syz-executor 36568 395531 48950 0 3 0x3000 suspend syz-executor 36568 396178 48950 0 2 0x4081000 syz-executor 48950 174191 1177 0 2 0xc82 syz-executor 10265 249157 1177 0 2 0xc82 syz-executor 10406 441476 1 0 3 0x100083 ttyin getty 87481 237124 0 0 3 0x14200 bored sosplice 58493 359082 1177 0 2 0x2 syz-executor 59440 470093 1177 0 2 0xc82 syz-executor 53011 409616 1177 0 2 0xc82 syz-executor 39760 222780 1177 0 2 0xc82 syz-executor 88647 324336 1177 0 2 0x2 syz-executor 38381 131873 1177 0 2 0xc82 syz-executor 1177 290777 22647 0 3 0x82 kqread syz-executor 22647 36189 30930 0 3 0x10008a sigsusp ksh 30930 346967 91461 0 3 0x98 kqread sshd-session 91461 266828 71750 0 3 0x92 kqread sshd-session 71750 7443 1 0 3 0x88 kqread sshd 46700 523858 71115 74 3 0x1100092 bpf pflogd 71115 505974 1 0 3 0x80 sbwait pflogd 19020 409342 20528 73 3 0x1100090 kqread syslogd 20528 255610 1 0 3 0x100082 sbwait syslogd 72555 476973 1 0 3 0x100080 kqread resolvd 8859 90963 36887 77 3 0x100092 kqread dhcpleased 6253 140798 36887 77 3 0x100092 kqread dhcpleased 36887 404664 1 0 3 0x80 kqread dhcpleased 93742 261187 0 0 3 0x14200 bored smr 37831 340949 0 0 2 0x14200 zerothread 85060 115300 0 0 3 0x14200 aiodoned aiodoned 46323 372299 0 0 3 0x14200 syncer update 9280 126150 0 0 3 0x14200 cleaner cleaner 23905 379698 0 0 2 0x14200 reaper 61747 13625 0 0 3 0x14200 pgdaemon pagedaemon 9206 123747 0 0 3 0x14200 bored viomb 6782 484267 0 0 3 0x40014200 acpi0 acpi0 92323 179305 0 0 3 0x40014200 idle1 51595 477404 0 0 3 0x14200 bored softnet7 31139 380129 0 0 3 0x14200 bored softnet6 38611 124657 0 0 3 0x14200 bored softnet5 78556 478492 0 0 3 0x14200 bored softnet4 29381 74367 0 0 3 0x14200 bored softnet3 2553 394161 0 0 3 0x14200 bored softnet2 57580 121134 0 0 3 0x14200 bored softnet1 48154 477106 0 0 3 0x14200 bored softnet0 80950 302121 0 0 3 0x14200 bored systqmp 74315 512378 0 0 3 0x14200 bored systq 48350 144923 0 0 3 0x14200 tmoslp softclockmp 89297 449477 0 0 2 0x40014200 softclock 97724 143034 0 0 3 0x40014200 idle0 1 290382 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff8389e208) #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 preempt+0x35 sys/kern/sched_bsd.c:340 #4 ast+0x15a mi_ast sys/sys/syscall_mi.h:252 [inline] #4 ast+0x15a sys/arch/amd64/amd64/trap.c:712 #5 Xsyscall+0x156 Process 36568 (syz-executor) thread 0xffff80003c4c0570 (396178) exclusive rrwlock inode r = 0 (0xfffffd806e25a240) #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+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 Process 58493 (syz-executor) thread 0xffff8000ffff2540 (359082) exclusive rrwlock inode r = 0 (0xfffffd806bd93200) #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+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3094 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10248 11133K 12590K 166960K 13567 0 pcb 17 20K 22K 166960K 322 0 rtable 173 10K 11K 166960K 626 0 pf 39 18K 22K 166960K 207 0 ifaddr 35 6K 7K 166960K 131 0 ifgroup 61 2K 2K 166960K 242 0 sysctl 4 1K 9K 166960K 25 0 counters 72 37K 38K 166960K 272 0 ioctlops 0 0K 4K 166960K 1840 0 iov 0 0K 28K 166960K 139 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1527 96K 96K 166960K 2918 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 25 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 92 0 dirhash 12 2K 2K 166960K 36 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 240K 166960K 1569 0 sigio 1 0K 0K 166960K 62 0 proc 72 115K 164K 166960K 750 0 subproc 72 4K 4K 166960K 93 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 400 0 in_multi 59 4K 7K 166960K 184 0 ether_multi 1 0K 0K 166960K 10 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 187 837K 837K 166960K 187 0 exec 0 0K 1K 166960K 524 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 250 168K 183K 166960K 15969 0 UVM aobj 22 2K 2K 166960K 26 0 pinsyscall 41 82K 102K 166960K 2730 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 78 0 NDP 14 0K 2K 166960K 95 0 temp 78 8648K 8755K 166960K 70559 0 kqueue 17 26K 32K 166960K 327 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 120 245 0 242 3 2 1 2 0 8 0 rtentry 176 152 0 92 5 0 5 5 0 8 0 unpcb 144 966 0 943 8 2 6 6 0 8 5 syncache 336 14 0 14 5 4 1 1 0 8 1 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 736 538 0 529 16 9 7 7 0 8 6 arp 128 20 0 9 1 0 1 1 0 8 0 inpcb 328 1939 0 1924 37 28 9 12 0 8 7 nd6 144 23 0 12 1 0 1 1 0 8 0 pkpcb 40 11 0 11 4 3 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 mppekey 1024 2 0 2 1 1 0 1 0 8 0 ppxss 1192 80 0 79 3 2 1 1 0 8 0 pppxif 1504 12 0 12 2 1 1 1 0 8 1 pfstscr 40 1 0 0 1 0 1 1 0 8 0 pffrag 232 12 0 6 1 0 1 1 0 482 0 pffrnode 88 12 0 6 1 0 1 1 0 8 0 pffrent 40 19 0 13 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 2 0 2 1 0 1 1 0 8 1 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pfstitem 24 102 0 25 1 0 1 1 0 8 0 pfstkey 128 102 0 25 3 0 3 3 0 8 0 pfstate 384 101 0 25 8 0 8 8 0 8 0 pfrule 1344 25 0 20 2 1 1 2 0 8 0 rttmr 136 2 0 2 2 2 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 634 0 365 29 7 22 28 0 8 2 art_table 40 637 0 365 5 0 5 5 0 8 0 art_node 32 151 0 102 1 0 1 1 0 8 0 sysvmsgpl 40 45 0 5 1 0 1 1 0 8 0 semapl 112 89 0 79 1 0 1 1 0 8 0 shmpl 112 23 0 4 1 0 1 1 0 8 0 dirhash 1024 33 0 16 3 0 3 3 0 8 0 dino2pl 256 4389 0 2882 95 0 95 95 0 8 0 ffsino 296 4389 0 2882 117 0 117 117 0 8 0 nchpl 144 6529 0 4829 65 1 64 64 0 8 0 rtmask 32 15 0 15 3 2 1 1 0 8 1 uvmvnodes 80 5408 0 0 111 0 111 111 0 8 0 vnodes 216 5408 0 0 301 0 301 301 0 8 0 namei 1024 23270 0 23269 2 1 1 1 0 8 0 percpumem 16 151 0 100 1 0 1 1 0 8 0 kstatmem 264 154 0 122 5 2 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 9 0 9 4 3 1 1 0 8 1 scxspl 216 43797 0 43797 16 13 3 8 1 8 3 plimitpl 152 482 0 464 1 0 1 1 0 8 0 sigapl 424 1890 0 1837 9 0 9 9 0 8 2 knotepl 120 869 0 0 26 0 26 26 0 8 0 kqueuepl 224 657 0 644 7 2 5 5 0 8 4 pipepl 344 298 0 270 9 6 3 9 0 8 0 fdescpl 528 1841 0 1811 3 0 3 3 0 8 0 filepl 160 12727 0 12495 40 19 21 21 0 8 8 lockfpl 104 594 0 592 1 0 1 1 0 8 0 lockfspl 48 236 0 234 1 0 1 1 0 8 0 sessionpl 144 33 0 24 1 0 1 1 0 8 0 pgrppl 48 113 0 96 1 0 1 1 0 8 0 ucredpl 104 1875 0 1858 1 0 1 1 0 8 0 zombiepl 144 2419 0 2416 2 1 1 1 0 8 0 processpl 1248 1890 0 1837 6 0 6 6 0 8 1 procpl 664 4411 0 4350 11 3 8 8 0 8 2 sosppl 168 12 0 12 4 4 0 1 0 8 0 sockpl 752 3302 0 3261 64 52 12 30 0 8 7 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 117 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mtagpl 96 79 0 0 2 0 2 2 0 8 0 mbufpl 256 394 0 0 25 0 25 25 0 8 0 bufpl 280 17586 0 11443 440 0 440 440 0 8 0 anonpl 32 11814 0 0 96 0 96 96 0 246 0 amapchunkpl 152 55309 0 54784 71 40 31 37 0 158 9 amappl16 200 6770 0 6693 51 34 17 23 0 8 8 amappl15 192 1 0 1 1 1 0 1 0 8 0 amappl14 184 185 0 173 1 0 1 1 0 8 0 amappl13 176 8 0 8 2 1 1 1 0 8 1 amappl12 168 2527 0 2497 3 1 2 2 0 8 0 amappl11 160 53 0 38 1 0 1 1 0 8 0 amappl10 152 6 0 6 1 1 0 1 0 8 0 amappl9 144 292 0 292 1 1 0 1 0 8 0 amappl8 136 57 0 53 1 0 1 1 0 8 0 amappl7 128 118 0 106 1 0 1 1 0 8 0 amappl6 120 250 0 246 1 0 1 1 0 8 0 amappl5 112 132 0 122 1 0 1 1 0 8 0 amappl4 104 347 0 327 1 0 1 1 0 8 0 amappl3 96 11078 0 10961 5 1 4 4 0 8 0 amappl2 88 735 0 672 2 0 2 2 0 8 0 amappl1 80 16245 0 15646 17 2 15 15 0 8 0 amappl 88 14970 0 14793 5 0 5 5 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 3 0 2 1 0 1 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 254 0 254 2 2 0 1 0 8 0 dma64 64 8 0 8 3 2 1 1 0 8 1 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 25 0 4 1 0 1 1 0 8 0 uaddrrnd 24 1841 0 1811 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1841 0 1811 1 0 1 1 0 8 0 vmmpekpl 168 16990 0 16948 3 0 3 3 0 8 0 vmmpepl 168 123472 0 121451 130 23 107 110 0 357 7 vmsppl 488 1840 0 1811 7 2 5 5 0 8 0 rwobjpl 80 39773 0 33342 132 0 132 132 0 8 0 pdppl 4096 3690 0 3622 112 40 72 84 0 8 4 pvpl 32 20319 0 0 164 0 164 164 0 265 0 pmappl 256 1840 0 1811 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 320 0 65 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8376fff0) 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:654 comcnputc(800,67) at comcnputc+0xd0 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,67) at comcnputc+0xd0 sys/dev/ic/com.c:1259 cnputc(67) at cnputc+0x67 sys/dev/cons.c:218 kputchar(67,5,0) at kputchar+0x2ed sys/kern/subr_prf.c:367 kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1 printf(ffffffff83417c57) at printf+0x8b sys/kern/subr_prf.c:529 trap_print(ffff80003c46b120,6) at trap_print+0x70 sys/arch/amd64/amd64/trap.c:626 kerntrap(ffff80003c46b120) at kerntrap+0x2e6 sys/arch/amd64/amd64/trap.c:487 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001665000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80003c4467f0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003c4467f0) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 end trace frame: 0xffff80003c46b2c0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff8376fff0) 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:654 comcnputc(800,67) at comcnputc+0xd0 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,67) at comcnputc+0xd0 sys/dev/ic/com.c:1259 cnputc(67) at cnputc+0x67 sys/dev/cons.c:218 kputchar(67,5,0) at kputchar+0x2ed sys/kern/subr_prf.c:367 kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1 printf(ffffffff83417c57) at printf+0x8b sys/kern/subr_prf.c:529 trap_print(ffff80003c46b120,6) at trap_print+0x70 sys/arch/amd64/amd64/trap.c:626 kerntrap(ffff80003c46b120) at kerntrap+0x2e6 sys/arch/amd64/amd64/trap.c:487 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001665000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80003c4467f0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003c4467f0) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c46b2d0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80710a6510,81,fffffd80097fb680,ffff80003c4467f0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8071255d90,ffff80003c4467f0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8071255d90,ffff80003c4467f0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8071255d90,ffff80003c4467f0) at fdrop+0x121 sys/kern/kern_descrip.c:1267 closef(fffffd8071255d90,ffff80003c4467f0) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80003c4467f0) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80003c4467f0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c4467f0,ffff80003c46b640,ffff80003c46b590) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c46b640) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c46b640) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cc64964aec0, count: -24 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7f91a353080, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7f91a353080, count: -1