login: uvm_fault(0xffffffff83a0a7b0, 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 *457747 21754 0 0x2000 0x4080000 0 syz-executor kcov_remote_enter(0,ffff80002a776d10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8399e2b0,ffff80002a772340) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a772340,0) 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 vinvalbuf(fffff0806f2c6e70,2,fffff08007ffd478,ffff80002a75b4d8,0,ffffffffffffffff) at vinvalbuf+0x608 sys/kern/vfs_subr.c:2010 ffs_truncate(fffff080777b3600,0,4,fffff08007ffd478) at ffs_truncate+0xf41 sys/ufs/ffs/ffs_inode.c:-1 ffs_write(ffff80003ca08dc0) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffff0806f2c6e70,ffff80003ca08f78,7,fffff08007ffd478) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffff0806f5e7438,ffff80003ca08f78,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002a75b4d8,4,ffff80003ca08f78,0,ffff80003ca09020) at dofilewritev+0x2bd sys/kern/sys_generic.c:384 sys_write(ffff80002a75b4d8,ffff80003ca090d0,ffff80003ca09020) at sys_write+0xa2 sys/kern/sys_generic.c:300 end trace frame: 0xffff80003ca090c0, count: 0 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(0xffffffff83a0a7b0, 0xffff800029ee6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80002a776d10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8399e2b0,ffff80002a772340) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a772340,0) 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 vinvalbuf(fffff0806f2c6e70,2,fffff08007ffd478,ffff80002a75b4d8,0,ffffffffffffffff) at vinvalbuf+0x608 sys/kern/vfs_subr.c:2010 ffs_truncate(fffff080777b3600,0,4,fffff08007ffd478) at ffs_truncate+0xf41 sys/ufs/ffs/ffs_inode.c:-1 ffs_write(ffff80003ca08dc0) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffff0806f2c6e70,ffff80003ca08f78,7,fffff08007ffd478) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffff0806f5e7438,ffff80003ca08f78,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002a75b4d8,4,ffff80003ca08f78,0,ffff80003ca09020) at dofilewritev+0x2bd sys/kern/sys_generic.c:384 sys_write(ffff80002a75b4d8,ffff80003ca090d0,ffff80003ca09020) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80003ca090d0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003ca090d0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7662007a3a0, count: -16 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80003ca08840 rbx 0xffff80002a776d10 rdx 0xffff80002a75b4d8 rcx 0xffff800029ee6000 rax 0xfffff0806caa5d80 r8 0 r9 0xffffffffffffffff r10 0xffff80003ca088b0 r11 0xfd40b79df3b7a857 r12 0xffffffff83178f60 endtsleep r13 0xffff80002a7722a8 r14 0xffff80002a776d10 r15 0 rip 0xffffffff8305cb92 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003ca08820 ss 0x10 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=457747 pid=21754 tcnt=3 stat=onproc flags process=2000 proc=4080000 runpri=72, usrpri=72, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a75b240 scnt=1 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a75a7e0,0xffff80002a75b250 process=0xffff8000ffffb198 user=0xffff80003ca04000, vmspace=0xfffff0806ca9da20 estcpu=22, cpticks=13, pctcpu=0.10, user=0, sys=12, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 79186 238878 48675 0 2 0 syz-executor 79186 260380 48675 0 3 0x4000080 fsleep syz-executor 79186 182629 48675 0 3 0x4000080 fsleep syz-executor 35804 18296 8019 0 2 0 syz-executor 35804 127439 8019 0 3 0x4000080 lockf syz-executor 34635 432017 84286 0 3 0x80 nanoslp syz-executor 34635 332388 84286 0 3 0x4000080 sbwait syz-executor 7194 447245 6217 -1 3 0x90 nanoslp syz-executor 7194 9161 6217 -1 3 0x4000090 sbwait syz-executor 7194 340483 6217 -1 3 0x4000090 fsleep syz-executor 34797 413313 259 -1 3 0x90 nanoslp syz-executor 34797 393687 259 -1 3 0x4000090 kqpoll syz-executor 34797 16064 259 -1 3 0x4000090 fsleep syz-executor 51449 100671 99818 60929 3 0x90 nanoslp syz-executor 51449 236470 99818 60929 3 0x4000090 ttyin syz-executor 51449 178149 99818 60929 3 0x4000090 fsleep syz-executor 21754 409124 70573 0 4 0x82000 syz-executor *21754 457747 70573 0 7 0x4082000 syz-executor 21754 12271 70573 0 3 0x4002000 suspend syz-executor 30718 126331 1 0 3 0x100083 ttyin getty 52935 72755 0 0 3 0x14200 acct acct 48675 346096 80621 0 3 0x82 nanoslp syz-executor 70573 422443 80621 0 3 0x82 nanoslp syz-executor 99818 452630 80621 0 3 0x82 nanoslp syz-executor 259 354946 80621 0 3 0x82 nanoslp syz-executor 84286 164710 80621 0 3 0x82 nanoslp syz-executor 8019 215458 80621 0 3 0x82 nanoslp syz-executor 6217 15105 80621 0 3 0x82 nanoslp syz-executor 80621 47103 1 0 3 0x82 wait syz-executor 42513 494873 1 73 3 0x1100090 kqread syslogd 58283 131799 0 0 3 0x14200 bored smr 9996 216127 0 0 2 0x14200 zerothread 87139 488029 0 0 3 0x14200 aiodoned aiodoned 25148 156979 0 0 3 0x14200 syncer update 70507 323527 0 0 3 0x14200 cleaner cleaner 88281 134786 0 0 3 0x14200 reaper reaper 49264 121782 0 0 3 0x14200 pgdaemon pagedaemon 24814 83072 0 0 3 0x14200 bored viomb 58697 317859 0 0 3 0x40014200 acpi0 acpi0 12280 23888 0 0 2 0x14200 softnet0 27167 35518 0 0 3 0x14200 bored systqmp 10400 444885 0 0 3 0x14200 bored systq 93796 180728 0 0 3 0x40014200 tmoslp softclock 49151 40272 0 0 3 0x40014200 idle0 1 469996 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 11061 12163K 16270K 166960K 13127 0 pcb 17 16K 18K 166960K 322 0 rtable 200 8K 9K 166960K 888 0 pf 29 13K 17K 166960K 94 0 ifaddr 31 5K 8K 166960K 71 0 ifgroup 42 1K 2K 166960K 114 0 sysctl 4 1K 9K 166960K 11 0 counters 31 17K 18K 166960K 61 0 ioctlops 0 0K 4K 166960K 326 0 iov 0 0K 20K 166960K 69 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1452 91K 92K 166960K 2073 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 99 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 236K 166960K 643 0 sigio 0 0K 0K 166960K 82 0 proc 26 41K 124K 166960K 554 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 3 0K 0K 166960K 70 0 in_multi 68 5K 7K 166960K 120 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 13 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 289 1288K 1288K 166960K 289 0 exec 0 0K 1K 166960K 496 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 164 84K 157K 166960K 7206 0 UVM aobj 78 3K 3K 166960K 80 0 pinsyscall 21 42K 96K 166960K 1734 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 31 0 NDP 9 0K 2K 166960K 48 0 temp 51 9109K 9173K 166960K 24669 0 kqueue 4 6K 29K 166960K 148 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 120 133 0 133 3 2 1 3 0 8 1 rtentry 136 348 0 270 4 0 4 4 0 8 0 unpcb 144 571 0 567 6 5 1 6 0 8 0 syncache 336 6 0 6 2 2 0 1 0 8 0 tcpcb 736 199 0 194 7 6 1 4 0 8 0 arp 96 84 0 72 1 0 1 1 0 8 0 ipq 40 4 0 0 1 0 1 1 0 8 0 ipqe 40 4 0 0 1 0 1 1 0 8 0 inpcb 328 818 0 810 14 12 2 9 0 8 0 ip6q 72 2 0 0 1 0 1 1 0 8 0 ip6af 40 2 0 0 1 0 1 1 0 8 0 nd6 112 25 0 10 1 0 1 1 0 8 0 pkpcb 40 3 0 3 2 2 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 20 0 20 2 2 0 1 0 8 0 pppxif 1416 2 0 2 1 1 0 1 0 8 0 pfstscr 40 8 0 3 1 0 1 1 0 8 0 pfrktable 1344 1 0 0 1 0 1 1 0 8 0 pfsrclim 320 2 0 1 2 1 1 1 0 8 0 pfstlim 224 2 0 2 1 1 0 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfqueue 320 1 0 0 1 0 1 1 0 8 0 pfstitem 24 7 0 0 1 0 1 1 0 8 0 pfstkey 128 13 0 6 1 0 1 1 0 8 0 pfstate 384 7 0 3 1 0 1 1 0 8 0 pfrule 1360 2 0 2 2 2 0 1 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 925 0 603 45 18 27 38 0 8 0 art_table 40 926 0 603 7 1 6 7 0 8 0 art_node 32 347 0 277 3 1 2 3 0 8 0 sysvmsgpl 40 8 0 3 1 0 1 1 0 8 0 semapl 72 96 0 86 1 0 1 1 0 8 0 shmpl 112 77 0 2 3 0 3 3 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2455 0 1002 92 0 92 92 0 8 0 ffsino 256 2456 0 1003 92 0 92 92 0 8 0 nchpl 144 3436 0 1739 64 0 64 64 0 8 0 rtmask 32 2 0 2 2 2 0 1 0 8 0 vnodes 216 3101 0 0 173 0 173 173 0 8 0 namei 1024 12411 0 12411 3 2 1 2 0 8 1 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 kstatmem 264 65 0 46 2 0 2 2 0 8 0 scsiplug 72 3 0 3 2 2 0 1 0 8 0 scxspl 216 17005 0 17005 11 10 1 8 1 8 1 plimitpl 152 220 0 206 1 0 1 1 0 8 0 sigapl 424 918 0 884 6 1 5 6 0 8 0 knotepl 120 27852 0 27591 37 27 10 23 0 8 0 kqueuepl 184 239 0 235 4 3 1 4 0 8 0 pipepl 304 186 0 159 5 2 3 5 0 8 0 fdescpl 448 904 0 884 5 1 4 5 0 8 0 filepl 120 5804 0 5622 14 6 8 14 0 8 0 lockfpl 104 175 0 173 2 1 1 1 0 8 0 lockfspl 48 76 0 75 2 1 1 1 0 8 0 sessionpl 144 133 0 129 1 0 1 1 0 8 0 pgrppl 48 145 0 133 1 0 1 1 0 8 0 ucredpl 104 923 0 915 1 0 1 1 0 8 0 zombiepl 144 890 0 889 3 2 1 1 0 8 0 processpl 1152 918 0 884 4 0 4 4 0 8 0 procpl 664 1653 0 1607 6 1 5 6 0 8 0 sockpl 552 1605 0 1593 15 13 2 15 0 8 0 mcl64k 65536 29 0 28 2 1 1 1 0 8 0 mcl16k 16384 2 0 2 1 1 0 1 0 8 0 mcl12k 12288 1 0 1 1 1 0 1 0 8 0 mcl9k128 9344 3 0 3 2 2 0 1 0 8 0 mcl8k 8192 38 0 38 2 2 0 1 0 8 0 mcl4k 4096 3200 0 3147 15 8 7 14 0 8 0 mcl2k 2048 679 0 678 1 0 1 1 0 8 0 mtagpl 96 6 0 6 2 2 0 1 0 8 0 mbufpl 256 10909 0 10724 92 78 14 91 0 8 0 bufpl 280 6315 0 105 444 0 444 444 0 8 0 anonpl 24 164345 0 158318 82 43 39 69 0 186 0 amapchunkpl 152 23925 0 23482 43 24 19 31 0 158 0 amappl16 200 3427 0 3161 28 13 15 21 0 8 0 amappl15 192 6 0 6 2 2 0 1 0 8 0 amappl14 184 414 0 414 1 1 0 1 0 8 0 amappl13 176 119 0 116 1 0 1 1 0 8 0 amappl12 168 1158 0 1139 2 0 2 2 0 8 0 amappl11 160 3 0 3 1 1 0 1 0 8 0 amappl10 152 61 0 59 1 0 1 1 0 8 0 amappl9 144 271 0 271 1 1 0 1 0 8 0 amappl8 136 111 0 111 1 1 0 1 0 8 0 amappl7 128 232 0 228 1 0 1 1 0 8 0 amappl6 120 149 0 148 1 0 1 1 0 8 0 amappl5 112 93 0 91 1 0 1 1 0 8 0 amappl4 104 267 0 258 1 0 1 1 0 8 0 amappl3 96 4592 0 4498 4 1 3 4 0 8 0 amappl2 88 532 0 516 2 0 2 2 0 8 0 amappl1 80 12147 0 11992 13 6 7 13 0 8 0 amappl 88 6404 0 6261 5 1 4 5 0 92 0 uvmvnodes 80 119 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 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 7 0 7 1 1 0 1 0 8 0 dma128 128 254 0 254 2 2 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 20 0 19 1 0 1 1 0 8 0 aobjpl 72 79 0 2 2 0 2 2 0 8 0 uaddrrnd 24 904 0 884 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 904 0 884 1 0 1 1 0 8 0 vmmpekpl 168 8906 0 8869 3 1 2 3 0 8 0 vmmpepl 168 65672 0 64464 102 46 56 96 0 357 0 vmsppl 368 903 0 884 4 1 3 4 0 8 0 rwobjpl 40 20651 0 19811 15 1 14 14 0 8 0 pdppl 4096 1814 0 1768 104 56 48 82 0 8 2 pvpl 32 430575 0 421496 173 87 86 154 0 265 0 pmappl 216 903 0 884 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 477 0 181 12 0 12 12 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace kcov_remote_enter(0,ffff80002a776d10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8399e2b0,ffff80002a772340) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a772340,0) 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 vinvalbuf(fffff0806f2c6e70,2,fffff08007ffd478,ffff80002a75b4d8,0,ffffffffffffffff) at vinvalbuf+0x608 sys/kern/vfs_subr.c:2010 ffs_truncate(fffff080777b3600,0,4,fffff08007ffd478) at ffs_truncate+0xf41 sys/ufs/ffs/ffs_inode.c:-1 ffs_write(ffff80003ca08dc0) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffff0806f2c6e70,ffff80003ca08f78,7,fffff08007ffd478) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffff0806f5e7438,ffff80003ca08f78,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002a75b4d8,4,ffff80003ca08f78,0,ffff80003ca09020) at dofilewritev+0x2bd sys/kern/sys_generic.c:384 sys_write(ffff80002a75b4d8,ffff80003ca090d0,ffff80003ca09020) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80003ca090d0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003ca090d0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7662007a3a0, count: -16 ddb> machine ddbcpu 1 No such command ddb> trace kcov_remote_enter(0,ffff80002a776d10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff8399e2b0,ffff80002a772340) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80002a772340,0) 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 vinvalbuf(fffff0806f2c6e70,2,fffff08007ffd478,ffff80002a75b4d8,0,ffffffffffffffff) at vinvalbuf+0x608 sys/kern/vfs_subr.c:2010 ffs_truncate(fffff080777b3600,0,4,fffff08007ffd478) at ffs_truncate+0xf41 sys/ufs/ffs/ffs_inode.c:-1 ffs_write(ffff80003ca08dc0) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffff0806f2c6e70,ffff80003ca08f78,7,fffff08007ffd478) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffff0806f5e7438,ffff80003ca08f78,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002a75b4d8,4,ffff80003ca08f78,0,ffff80003ca09020) at dofilewritev+0x2bd sys/kern/sys_generic.c:384 sys_write(ffff80002a75b4d8,ffff80003ca090d0,ffff80003ca09020) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80003ca090d0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003ca090d0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7662007a3a0, count: -16 ddb>