5kernel:XIag0e a uStopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND * 49849 95940 0 0x2 0 0 arp 431878 92294 0 0 0x4000000 1K syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x7f376a02e688, count: 14 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu1: uvm_fault(0xfffff0006c4a57b0, 0x98, 0, 1) -> e ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7f376a02e688, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a370090 rbx 0 rdx 0 rcx 0xffff80003c3bfcb0 rax 0x3b r8 0xffff80002a36ffc0 r9 0xffff80002a36fca0 r10 0x349d0980fdc201e8 r11 0x9a380b0463be365d r12 0 r13 0 r14 0xffff80003c3bfcb0 r15 0 rip 0xffffffff821503ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a370010 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{0}> show proc PROC (arp) tid=49849 pid=95940 tcnt=1 stat=onproc flags process=2 proc=0 runpri=80, usrpri=80, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c3be2c0,0xffff80003c3be568 process=0xffff80003c3c26a0 user=0xffff80002a36b000, vmspace=0xfffff0006d03a7a8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 72135 334141 8141 0 2 0 syz-executor 72135 206406 8141 0 2 0x4000000 syz-executor 72135 288961 8141 0 2 0x4000000 syz-executor *95940 49849 58788 0 7 0x2 arp 58788 355998 94613 0 3 0x10008a sigsusp sh 73033 417840 24282 0 2 0 syz-executor 73033 383358 24282 0 3 0x4000080 fsleep syz-executor 92294 347164 44480 0 2 0 syz-executor 92294 431878 44480 0 7 0x4000000 syz-executor 36418 71385 66766 0 2 0 syz-executor 36418 103330 66766 0 3 0x4000080 fsleep syz-executor 36418 483507 66766 0 3 0x4000080 fsleep syz-executor 36418 22055 66766 0 3 0x4000080 fsleep syz-executor 4306 134081 64857 0 2 0 syz-executor 4306 499383 64857 0 3 0x4000080 fsleep syz-executor 4306 128419 64857 0 3 0x4000080 fsleep syz-executor 98287 496540 48885 0 2 0 syz-executor 98287 152622 48885 0 3 0x4000080 fsleep syz-executor 98287 75983 48885 0 3 0x4000080 fsleep syz-executor 94613 320960 63322 0 3 0x82 wait syz-executor 48885 75611 63322 0 3 0x82 nanoslp syz-executor 61077 463503 65348 0 3 0x100082 sbwait arp 65348 94782 70223 0 3 0x10008a sigsusp sh 66766 353101 63322 0 3 0x82 nanoslp syz-executor 8141 150051 63322 0 3 0x82 nanoslp syz-executor 44480 504574 63322 0 3 0x82 nanoslp syz-executor 24282 406971 63322 0 3 0x82 nanoslp syz-executor 64857 464067 63322 0 3 0x82 nanoslp syz-executor 70223 471483 63322 0 3 0x82 wait syz-executor 63322 150659 1 0 3 0x82 kqread syz-executor 35304 198789 0 0 3 0x14200 bored smr 29482 146410 0 0 2 0x14200 zerothread 32959 436915 0 0 3 0x14200 aiodoned aiodoned 25158 41756 0 0 3 0x14200 syncer update 97401 263451 0 0 3 0x14200 cleaner cleaner 6542 83574 0 0 3 0x14200 reaper reaper 29468 173504 0 0 3 0x14200 pgdaemon pagedaemon 5733 415836 0 0 3 0x14200 bored viomb 32669 195793 0 0 3 0x40014200 acpi0 acpi0 6439 40527 0 0 3 0x40014200 idle1 81975 369503 0 0 3 0x14200 bored softnet1 25771 473180 0 0 3 0x14200 bored softnet0 92963 69268 0 0 3 0x14200 bored systqmp 60330 333892 0 0 3 0x14200 bored systq 65884 40772 0 0 3 0x14200 tmoslp softclockmp 4802 118806 0 0 3 0x40014200 tmoslp softclock 4923 523322 0 0 3 0x40014200 idle0 1 43976 0 0 3 0x10000082 nanoslp init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 95940 (arp) thread 0xffff80003c3bfcb0 (49849) exclusive rwlock kmmaplk r = 0 (0xffffffff83b2e2f0) #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:5171 #3 uvm_map_extract+0x5c7 sys/uvm/uvm_map.c:4278 #4 sys_kbind+0x6e4 sys/uvm/uvm_mmap.c:1279 #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 rwlock vmmaplk r = 0 (0xfffff0006d03a8a8) #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:5171 #3 uvm_map_extract+0x17c sys/uvm/uvm_map.c:4242 #4 sys_kbind+0x6e4 sys/uvm/uvm_mmap.c:1279 #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 92294 (syz-executor) thread 0xffff807ffffe6a80 (431878) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83b0b900) #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11049 12088K 12279K 166960K 12374 0 pcb 17 14K 16K 166960K 121 0 rtable 198 7K 8K 166960K 644 0 pf 33 17K 24K 166960K 111 0 ifaddr 35 5K 7K 166960K 92 0 ifgroup 51 2K 2K 166960K 125 0 sysctl 3 1K 9K 166960K 8 0 counters 68 36K 37K 166960K 110 0 ioctlops 0 0K 4K 166960K 1527 0 iov 0 0K 12K 166960K 6 0 mount 1 1K 1K 166960K 1 0 log 1 0K 0K 166960K 5 0 vnodes 1395 88K 88K 166960K 1668 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 8 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 73K 93K 166960K 424 0 sigio 0 0K 0K 166960K 65 0 proc 12 17K 164K 166960K 836 0 subproc 72 4K 4K 166960K 162 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 14 0 in_multi 68 5K 6K 166960K 189 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 10 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 537 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 136 81K 180K 166960K 5288 0 UVM aobj 131 4K 4K 166960K 132 0 pinsyscall 22 44K 108K 166960K 1862 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 6 0 NDP 11 0K 1K 166960K 63 0 temp 73 9127K 9154K 166960K 14256 0 kqueue 1 2K 24K 166960K 52 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 57 0 56 1 0 1 1 0 8 0 rtentry 176 209 0 124 5 0 5 5 0 8 0 unpcb 144 233 0 231 6 1 5 6 0 8 4 syncache 336 7 0 7 1 0 1 1 0 8 1 tcpcb 736 106 0 105 7 0 7 7 0 8 6 arp 136 37 0 22 1 0 1 1 0 8 0 inpcb 328 349 0 347 7 0 7 7 0 8 6 nd6 152 49 0 34 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 18 0 10 1 0 1 1 0 8 0 ppxss 1192 6 0 6 1 0 1 1 0 8 1 pfstscr 40 4 0 2 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 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 pfrktable 1344 1 0 0 1 0 1 1 0 8 0 pfsrclim 320 1 0 1 1 0 1 1 0 8 1 pfanchor 1288 4 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 32 0 0 1 0 1 1 0 8 0 pfstkey 128 34 0 2 2 0 2 2 0 8 0 pfstate 448 32 0 1 4 0 4 4 0 8 0 pfrule 1360 22 0 16 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 840 0 504 27 0 27 27 0 8 3 art_table 40 842 0 504 5 0 5 5 0 8 0 art_node 32 209 0 131 1 0 1 1 0 8 0 semapl 72 4 0 1 1 0 1 1 0 8 0 shmpl 112 129 0 1 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1847 0 349 94 0 94 94 0 8 0 ffsino 296 1847 0 349 116 0 116 116 0 8 0 nchpl 144 2219 0 477 65 0 65 65 0 8 0 vnodes 216 2195 0 0 122 0 122 122 0 8 0 namei 1024 7854 0 7854 3 0 3 3 0 8 3 percpumem 16 70 0 21 1 0 1 1 0 8 0 kstatmem 264 65 0 40 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 9133 0 9133 4 3 1 3 1 8 1 plimitpl 152 54 0 37 1 0 1 1 0 8 0 sigapl 424 733 0 683 7 1 6 7 0 8 0 knotepl 120 301 0 0 10 0 10 10 0 8 0 kqueuepl 224 58 0 57 1 0 1 1 0 8 0 pipepl 344 172 0 145 3 0 3 3 0 8 0 fdescpl 528 716 0 695 3 0 3 3 0 8 0 filepl 160 3013 0 2786 18 2 16 18 0 8 6 lockfpl 104 124 0 90 1 0 1 1 0 8 0 lockfspl 48 76 0 42 1 0 1 1 0 8 0 sessionpl 144 39 0 30 1 0 1 1 0 8 0 pgrppl 48 58 0 41 1 0 1 1 0 8 0 ucredpl 104 221 0 208 1 0 1 1 0 8 0 zombiepl 144 696 0 683 1 0 1 1 0 8 0 processpl 1232 733 0 683 5 1 4 5 0 8 0 procpl 664 991 0 930 6 0 6 6 0 8 0 sosppl 176 1 0 1 1 0 1 1 0 8 1 sockpl 752 644 0 639 24 14 10 24 0 8 8 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k128 9344 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 124 0 0 16 0 16 16 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 220 0 0 14 0 14 14 0 8 0 bufpl 272 4228 0 106 275 0 275 275 0 8 0 anonpl 32 7904 0 0 64 0 64 64 0 115 0 amapchunkpl 152 14865 0 14523 26 0 26 26 0 158 11 amappl16 200 1871 0 1855 15 5 10 15 0 8 8 amappl15 192 21 0 21 1 1 0 1 0 8 0 amappl14 184 550 0 547 1 0 1 1 0 8 0 amappl13 176 203 0 201 1 0 1 1 0 8 0 amappl12 168 1053 0 1034 2 0 2 2 0 8 0 amappl11 160 3 0 3 1 1 0 1 0 8 0 amappl10 152 73 0 73 1 0 1 1 0 8 1 amappl9 144 318 0 318 1 1 0 1 0 8 0 amappl8 136 143 0 143 1 0 1 1 0 8 1 amappl7 128 166 0 163 1 0 1 1 0 8 0 amappl6 120 250 0 248 1 0 1 1 0 8 0 amappl5 112 103 0 103 1 0 1 1 0 8 1 amappl4 104 346 0 343 1 0 1 1 0 8 0 amappl3 96 2852 0 2772 4 0 4 4 0 8 1 amappl2 88 645 0 635 2 0 2 2 0 8 0 amappl1 80 12893 0 12749 17 2 15 17 0 8 8 amappl 88 4297 0 4181 4 0 4 4 0 92 1 uvmvnodes 80 108 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 7 0 7 2 1 1 1 0 8 1 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 72 131 0 1 3 0 3 3 0 8 0 uaddrrnd 24 716 0 695 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 716 0 695 1 0 1 1 0 8 0 vmmpekpl 168 7716 0 7677 3 0 3 3 0 8 0 vmmpepl 168 55573 0 54698 99 0 99 99 0 357 57 vmsppl 488 715 0 695 5 0 5 5 0 8 1 rwobjpl 80 18939 0 18355 30 1 29 29 0 8 6 pdppl 4096 1439 0 1390 113 64 49 85 0 8 0 pvpl 32 15915 0 0 129 0 129 129 0 265 0 pmappl 256 715 0 695 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 574 0 67 15 0 15 15 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7f376a02e688, count: -1 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff80002998dff0) 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(800,75) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,75) at comcnputc+0x250 sys/dev/ic/com.c:1274 cnputc(75) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(75) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834ace1c) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80002a364090) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff80002a364090) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80002a364090) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff807ffffe6a80,fffff0006abc96e0,ffff80002a364270) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2690 sys_futimes(ffff807ffffe6a80,ffff80002a3643c0,ffff80002a364310) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2732 end trace frame: 0xffff80002a3643b0, count: 0 ddb{1}> trace x86_ipi_db(ffff80002998dff0) 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(800,75) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,75) at comcnputc+0x250 sys/dev/ic/com.c:1274 cnputc(75) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(75) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834ace1c) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80002a364090) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff80002a364090) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80002a364090) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff807ffffe6a80,fffff0006abc96e0,ffff80002a364270) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2690 sys_futimes(ffff807ffffe6a80,ffff80002a3643c0,ffff80002a364310) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2732 syscall(ffff80002a3643c0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3643c0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9f0b9bfc7e0, count: -16 ddb{1}>