uvm_fault(0xffffffff83aa2070, 0xffff800029ee6000, 0, 2) -> e kernel: page fault trap, code=2 Stopped at kcov_remote_enter+0x122: movq $0,0(%rcx) TID PID UID PRFLAGS PFLAGS CPU COMMAND *493862 71408 0 0 0x4000000 0 syz-executor kcov_remote_enter(0,ffff8000ffff8498) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838fa0a0,ffff80002a7700b0) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7700b0,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756 softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788 softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87 dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 writedisklabel(d02,ffffffff828ab620,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff800001593000,3,ffff80002a766010) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd806e32fca8,84946467,ffff800001593000,3,fffffd8007ffd820,ffff80002a766010) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8068c89168,84946467,ffff800001593000,ffff80002a766010) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80002a766010,ffff80003c8dfb80,ffff80003c8dfad0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c8dfb80) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c8dfb80) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xea55b5ede50, count: 1 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: uvm_fault(0xffffffff83aa2070, 0xffff800029ee6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff8000ffff8498) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838fa0a0,ffff80002a7700b0) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7700b0,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756 softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788 softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87 dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 writedisklabel(d02,ffffffff828ab620,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff800001593000,3,ffff80002a766010) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd806e32fca8,84946467,ffff800001593000,3,fffffd8007ffd820,ffff80002a766010) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8068c89168,84946467,ffff800001593000,ffff80002a766010) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80002a766010,ffff80003c8dfb80,ffff80003c8dfad0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c8dfb80) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c8dfb80) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xea55b5ede50, count: -14 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80003c8df4f0 rbx 0xffff8000ffff8498 rdx 0xffff80002a766010 rcx 0xffff800029ee6000 rax 0xfffffd806cadfcf0 r8 0xffff80003c8df678 r9 0 r10 0x30b5794b3f3fbaf8 r11 0x3b2e355c7c66f1f8 r12 0xffffffff82d26620 endtsleep r13 0xffff80002a770018 r14 0xffff8000ffff8498 r15 0 rip 0xffffffff8317a6e2 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003c8df4d0 ss 0x10 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=493862 pid=71408 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a749788,0xffffffff839dcc08 process=0xffff80002a747608 user=0xffff80003c8da000, vmspace=0xfffffd806cad32f0 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 71408 485965 47466 0 2 0 syz-executor *71408 493862 47466 0 7 0x4000000 syz-executor 32470 243755 41900 0 2 0 syz-executor 32470 324583 41900 0 3 0x4000080 fifor syz-executor 25081 378801 14384 0 2 0 syz-executor 25081 200625 14384 0 3 0x4000080 kqread syz-executor 25081 57896 14384 0 2 0x4000000 syz-executor 54795 388969 5488 0 2 0 syz-executor 54795 503802 5488 0 3 0x4000080 fsleep syz-executor 43056 383766 39383 0 2 0 syz-executor 43056 109006 39383 0 3 0x4000080 fsleep syz-executor 43056 313849 39383 0 3 0x4000080 fsleep syz-executor 52518 84185 29921 0 2 0 syz-executor 52518 28663 29921 0 3 0x4000080 kqsel syz-executor 52518 228682 29921 0 3 0x4000080 kqsel syz-executor 51300 348245 20581 0 2 0 syz-executor 51300 510711 20581 0 3 0x4000080 fsleep syz-executor 84310 267256 1 0 3 0x80 nanoslp init 14384 18336 19860 0 3 0x82 nanoslp syz-executor 50766 235685 0 0 3 0x14280 nfsidl nfsio 66875 147403 0 0 3 0x14280 nfsidl nfsio 67046 323715 0 0 3 0x14280 nfsidl nfsio 10631 338559 0 0 3 0x14280 nfsidl nfsio 89713 422422 0 0 3 0x14280 nfsidl nfsio 34056 91035 0 0 3 0x14280 nfsidl nfsio 43368 396664 0 0 3 0x14280 nfsidl nfsio 12702 274738 0 0 3 0x14280 nfsidl nfsio 612 49297 0 0 3 0x14280 nfsidl nfsio 85103 342424 0 0 3 0x14280 nfsidl nfsio 97858 292510 0 0 3 0x14280 nfsidl nfsio 29967 94672 0 0 3 0x14280 nfsidl nfsio 16295 150723 0 0 3 0x14280 nfsidl nfsio 65009 463595 0 0 3 0x14280 nfsidl nfsio 57179 472177 0 0 3 0x14280 nfsidl nfsio 46319 162001 0 0 3 0x14280 nfsidl nfsio 55523 35579 0 0 3 0x14280 nfsidl nfsio 65295 204345 0 0 3 0x14280 nfsidl nfsio 49696 168989 0 0 3 0x14280 nfsidl nfsio 80921 352211 0 0 3 0x14280 nfsidl nfsio 84004 159147 0 0 3 0x14200 acct acct 29921 438920 19860 0 3 0x82 nanoslp syz-executor 20581 519861 19860 0 3 0x82 nanoslp syz-executor 18444 268643 19860 0 3 0x82 nanoslp syz-executor 5488 45399 19860 0 3 0x82 nanoslp syz-executor 41900 483521 19860 0 3 0x82 nanoslp syz-executor 39383 428104 19860 0 3 0x82 nanoslp syz-executor 47466 13394 19860 0 3 0x82 nanoslp syz-executor 19860 390395 1 0 2 0x2 syz-executor 87167 506254 0 0 3 0x14200 bored smr 91170 83672 0 0 2 0x14200 zerothread 64822 181287 0 0 3 0x14200 aiodoned aiodoned 61302 425305 0 0 3 0x14200 syncer update 41864 410118 0 0 3 0x14200 cleaner cleaner 717 192904 0 0 3 0x14200 reaper reaper 30236 278493 0 0 3 0x14200 pgdaemon pagedaemon 62351 492067 0 0 3 0x14200 bored viomb 88187 344014 0 0 3 0x40014200 acpi0 acpi0 59202 79420 0 0 3 0x14200 bored softnet0 63273 319823 0 0 3 0x14200 bored systqmp 94581 402100 0 0 3 0x14200 bored systq 24409 86788 0 0 3 0x40014200 tmoslp softclock 40263 169675 0 0 3 0x40014200 idle0 1 151829 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11043 12130K 12599K 166960K 13564 0 pcb 19 13K 14K 166960K 149 0 rtable 196 6K 10K 166960K 547 0 pf 34 14K 74K 166960K 117 0 ifaddr 37 6K 7K 166960K 78 0 ifgroup 46 2K 2K 166960K 110 0 sysctl 4 1K 9K 166960K 12 0 counters 32 17K 18K 166960K 58 0 ioctlops 1 2K 4K 166960K 280 0 iov 0 0K 16K 166960K 92 0 mount 1 1K 1K 166960K 1 0 log 1 0K 0K 166960K 5 0 vnodes 1451 91K 91K 166960K 2315 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 20K 24K 166960K 17 0 VM map 2 1K 1K 166960K 2 0 sem 16 3K 4K 166960K 30 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 65K 93K 166960K 797 0 sigio 0 0K 0K 166960K 11 0 proc 14 25K 100K 166960K 670 0 subproc 72 4K 4K 166960K 100 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 76 0 in_multi 87 6K 7K 166960K 154 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 22 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 461 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 138 78K 165K 166960K 8455 0 UVM aobj 17 4K 4K 166960K 17 0 pinsyscall 19 38K 94K 166960K 1984 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 22 0 NDP 10 0K 2K 166960K 53 0 temp 74 9116K 9180K 166960K 23924 0 kqueue 5 8K 35K 166960K 140 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 139 0 138 3 0 3 3 0 8 2 rtentry 136 166 0 82 4 0 4 4 0 8 0 unpcb 144 555 0 553 9 3 6 6 0 8 5 syncache 336 7 0 7 2 1 1 1 0 8 1 tcpcb 736 190 0 188 4 0 4 4 0 8 3 arp 96 27 0 12 1 0 1 1 0 8 0 ipq 40 7 0 1 1 0 1 1 0 8 0 ipqe 40 9 0 2 1 0 1 1 0 8 0 inpcb 328 653 0 647 8 2 6 6 0 8 5 ip6q 72 4 0 0 1 0 1 1 0 8 0 ip6af 40 4 0 0 1 0 1 1 0 8 0 nd6 112 38 0 17 1 0 1 1 0 8 0 pkpcb 40 5 0 5 1 0 1 1 0 8 1 kcovpl 48 11 0 3 1 0 1 1 0 8 0 ppxss 1072 16 0 16 2 1 1 1 0 8 1 pfstscr 40 41 0 39 2 1 1 1 0 8 0 pfosfp 40 2 0 0 1 0 1 1 0 8 0 pfosfpen 112 2 0 0 1 0 1 1 0 8 0 pfrktable 1344 12 0 12 2 1 1 1 0 8 1 pfanchor 1288 2 0 1 2 1 1 1 0 8 0 pftag 88 2 0 2 2 1 1 1 0 8 1 pfstitem 24 6 0 0 1 0 1 1 0 8 0 pfstkey 128 78 0 72 2 1 1 1 0 8 0 pfstate 384 39 0 36 2 1 1 1 0 8 0 pfrule 1360 3 0 3 2 1 1 1 0 8 1 rttmr 136 3 0 3 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 739 0 321 29 2 27 29 0 8 0 art_table 40 740 0 321 5 0 5 5 0 8 0 art_node 32 164 0 89 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 2 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 72 20 0 6 1 0 1 1 0 8 0 shmpl 112 14 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2777 0 1316 92 0 92 92 0 8 0 ffsino 256 2777 0 1316 92 0 92 92 0 8 0 nchpl 144 3847 0 2136 64 0 64 64 0 8 0 rtmask 32 3 0 3 1 0 1 1 0 8 1 vnodes 216 3528 0 0 196 0 196 196 0 8 0 namei 1024 13380 0 13380 3 1 2 2 0 8 2 pfiaddrpl 120 3 0 3 1 1 0 1 0 8 0 kstatmem 264 61 0 40 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 17428 0 17428 10 2 8 8 1 8 8 plimitpl 152 123 0 113 1 0 1 1 0 8 0 sigapl 424 1110 0 1056 9 1 8 8 0 8 0 knotepl 120 27510 0 27490 30 19 11 18 0 8 8 kqueuepl 184 205 0 198 1 0 1 1 0 8 0 pipepl 304 172 0 144 3 0 3 3 0 8 0 fdescpl 448 1076 0 1056 5 1 4 5 0 8 0 filepl 120 6334 0 6163 17 5 12 14 0 8 2 lockfpl 104 315 0 315 1 0 1 1 0 8 1 lockfspl 48 133 0 133 1 0 1 1 0 8 1 sessionpl 144 86 0 84 1 0 1 1 0 8 0 pgrppl 48 106 0 96 1 0 1 1 0 8 0 ucredpl 104 1037 0 1034 1 0 1 1 0 8 0 zombiepl 144 1057 0 1056 2 1 1 1 0 8 0 processpl 1152 1110 0 1056 5 0 5 5 0 8 0 procpl 664 2078 0 2014 8 0 8 8 0 8 1 sosppl 176 3 0 3 2 1 1 1 0 8 1 sockpl 552 1384 0 1375 17 8 9 10 0 8 8 mcl64k 65536 110 0 109 2 1 1 1 0 8 0 mcl16k 16384 4 0 4 1 0 1 1 0 8 1 mcl12k 12288 2 0 2 1 0 1 1 0 8 1 mcl9k128 9344 2 0 2 1 0 1 1 0 8 1 mcl8k 8192 17 0 17 2 1 1 1 0 8 1 mcl4k 4096 3405 0 3351 15 6 9 14 0 8 1 mcl2k 2048 699 0 697 1 0 1 1 0 8 0 mtagpl 96 12 0 4 1 0 1 1 0 8 0 mbufpl 256 11136 0 10968 32 12 20 26 0 8 8 bufpl 280 6226 0 104 438 0 438 438 0 8 0 anonpl 24 169893 0 168246 64 12 52 52 0 186 22 amapchunkpl 152 28254 0 27867 38 5 33 33 0 158 13 amappl16 200 3032 0 3006 22 9 13 19 0 8 8 amappl15 192 8 0 8 2 1 1 1 0 8 1 amappl14 184 448 0 448 1 0 1 1 0 8 1 amappl13 176 122 0 122 1 0 1 1 0 8 1 amappl12 168 1325 0 1307 2 0 2 2 0 8 0 amappl11 160 2 0 2 1 1 0 1 0 8 0 amappl10 152 62 0 62 1 0 1 1 0 8 1 amappl9 144 271 0 271 1 1 0 1 0 8 0 amappl8 136 125 0 124 1 0 1 1 0 8 0 amappl7 128 148 0 146 1 0 1 1 0 8 0 amappl6 120 177 0 177 1 0 1 1 0 8 1 amappl5 112 103 0 102 1 0 1 1 0 8 0 amappl4 104 272 0 269 1 0 1 1 0 8 0 amappl3 96 5616 0 5530 4 0 4 4 0 8 0 amappl2 88 651 0 641 2 0 2 2 0 8 0 amappl1 80 13154 0 13055 13 1 12 13 0 8 5 amappl 88 7604 0 7477 5 0 5 5 0 92 0 uvmvnodes 80 115 0 0 3 0 3 3 0 8 0 dma8192 8192 1 0 1 1 0 1 1 0 8 1 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 16 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1076 0 1056 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1076 0 1056 1 0 1 1 0 8 0 vmmpekpl 168 9905 0 9854 3 0 3 3 0 8 0 vmmpepl 168 74794 0 73915 95 1 94 94 0 357 53 vmsppl 368 1075 0 1056 4 1 3 4 0 8 0 rwobjpl 40 22199 0 21770 14 0 14 14 0 8 2 pdppl 4096 2158 0 2112 102 56 46 80 0 8 0 pvpl 32 480431 0 475774 136 19 117 117 0 265 47 pmappl 216 1075 0 1056 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 396 0 85 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff8000ffff8498) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838fa0a0,ffff80002a7700b0) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a7700b0,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756 softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788 softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87 dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 writedisklabel(d02,ffffffff828ab620,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff800001593000,3,ffff80002a766010) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd806e32fca8,84946467,ffff800001593000,3,fffffd8007ffd820,ffff80002a766010) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8068c89168,84946467,ffff800001593000,ffff80002a766010) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80002a766010,ffff80003c8dfb80,ffff80003c8dfad0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003c8dfb80) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c8dfb80) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xea55b5ede50, count: -14 ddb>