panic: kernel diagnostic assertion "ISSET(bp->b_flags, B_BC)" failed: file "/syzkaller/managers/main/kernel/sys/kern/vfs_bio.c", line 1710 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *288943 32160 0 0 0x4000000 0 syz-executor.6 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8284c9fe) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828d358e,ffffffff82878c97,6ae,ffffffff828cd854) at __assert+0x29 sys/kern/subr_prf.c:157 bufcache_take(fffffd806d045810) at bufcache_take+0x244 sys/kern/vfs_bio.c:1711 getblk(fffffd806be35720,0,4000,0,ffffffffffffffff) at getblk+0x191 sys/kern/vfs_bio.c:1050 bread(fffffd806be35720,0,4000,ffff800037888bd0) at bread+0x3e bio_doread sys/kern/vfs_bio.c:433 [inline] bread(fffffd806be35720,0,4000,ffff800037888bd0) at bread+0x3e sys/kern/vfs_bio.c:478 ffs_bufatoff(fffffd8061a64f00,0,0,ffff800037888c88) at ffs_bufatoff+0x129 sys/ufs/ffs/ffs_subr.c:71 ufs_lookup() at ufs_lookup+0x466 sys/ufs/ufs/ufs_lookup.c:256 VOP_LOOKUP(fffffd806be35720,ffff800037889108,ffff800037889138) at VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 vfs_lookup(ffff8000378890d8) at vfs_lookup+0x6dc sys/kern/vfs_lookup.c:566 namei(ffff8000378890d8) at namei+0x55a sys/kern/vfs_lookup.c:250 vn_open(ffff8000378890d8,201,0) at vn_open+0x17b sys/kern/vfs_vnops.c:107 doopenat(ffff80002a6c9d40,ffffff9c,20000040,200,0,ffff8000378892a0) at doopenat+0x26e sys/kern/vfs_syscalls.c:1126 syscall(ffff800037889360) at syscall+0x5ef sys/arch/amd64/amd64/trap.c:591 end trace frame: 0xffff8000378893e0, 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: kernel diagnostic assertion "ISSET(bp->b_flags, B_BC)" failed: file "/syzkaller/managers/main/kernel/sys/kern/vfs_bio.c", line 1710 ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8284c9fe) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828d358e,ffffffff82878c97,6ae,ffffffff828cd854) at __assert+0x29 sys/kern/subr_prf.c:157 bufcache_take(fffffd806d045810) at bufcache_take+0x244 sys/kern/vfs_bio.c:1711 getblk(fffffd806be35720,0,4000,0,ffffffffffffffff) at getblk+0x191 sys/kern/vfs_bio.c:1050 bread(fffffd806be35720,0,4000,ffff800037888bd0) at bread+0x3e bio_doread sys/kern/vfs_bio.c:433 [inline] bread(fffffd806be35720,0,4000,ffff800037888bd0) at bread+0x3e sys/kern/vfs_bio.c:478 ffs_bufatoff(fffffd8061a64f00,0,0,ffff800037888c88) at ffs_bufatoff+0x129 sys/ufs/ffs/ffs_subr.c:71 ufs_lookup() at ufs_lookup+0x466 sys/ufs/ufs/ufs_lookup.c:256 VOP_LOOKUP(fffffd806be35720,ffff800037889108,ffff800037889138) at VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 vfs_lookup(ffff8000378890d8) at vfs_lookup+0x6dc sys/kern/vfs_lookup.c:566 namei(ffff8000378890d8) at namei+0x55a sys/kern/vfs_lookup.c:250 vn_open(ffff8000378890d8,201,0) at vn_open+0x17b sys/kern/vfs_vnops.c:107 doopenat(ffff80002a6c9d40,ffffff9c,20000040,200,0,ffff8000378892a0) at doopenat+0x26e sys/kern/vfs_syscalls.c:1126 syscall(ffff800037889360) at syscall+0x5ef sys/arch/amd64/amd64/trap.c:591 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdf6e5bc03a0, count: -15 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800037888870 rbx 0 rdx 0xffff800000dc4440 rcx 0 rax 0xffff80002a6c9d40 r8 0x101010101010101 r9 0x8080808080808080 r10 0x675e769b1726e632 r11 0x3173c3b03cbc97b2 r12 0 r13 0xfffffd806d045810 r14 0 r15 0x1 rip 0xffffffff81727edc db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800037888860 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb> show proc PROC (syz-executor.6) tid=288943 pid=32160 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=81, usrpri=81, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002a6c8d50,0xffff80002a6c9800 process=0xffff8000377e2198 user=0xffff800037884000, vmspace=0xfffffd805bd499d0 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 72938 514053 77538 60928 3 0x90 nanoslp syz-executor.1 72938 344548 77538 60928 3 0x4000010 smrbar syz-executor.1 72938 207959 77538 60928 3 0x4000090 fsleep syz-executor.1 30809 43538 83151 0 3 0x80 nanoslp syz-executor.4 30809 472087 83151 0 3 0x4000000 biowait syz-executor.4 30809 182858 83151 0 3 0x4000080 fsleep syz-executor.4 81925 228680 95890 0 2 0 syz-executor.3 81925 461429 95890 0 3 0x4000080 fsleep syz-executor.3 81925 251203 95890 0 3 0x4000080 fsleep syz-executor.3 90529 214703 60618 0 3 0x80 fsleep syz-executor.2 90529 4458 60618 0 3 0x4000080 nanoslp syz-executor.2 32160 216058 94430 0 3 0x80 fsleep syz-executor.6 *32160 288943 94430 0 7 0x4000000 syz-executor.6 13443 99475 77834 0 3 0x80 fsleep syz-executor.0 13443 27966 77834 0 3 0x4000080 netio syz-executor.0 43866 205604 0 0 3 0x14280 nfsidl nfsio 69404 484544 0 0 3 0x14280 nfsidl nfsio 49797 487177 0 0 3 0x14280 nfsidl nfsio 36721 210112 0 0 3 0x14280 nfsidl nfsio 74216 50805 0 0 3 0x14280 nfsidl nfsio 50777 444509 0 0 3 0x14280 nfsidl nfsio 77496 256988 0 0 3 0x14280 nfsidl nfsio 27337 277917 0 0 3 0x14280 nfsidl nfsio 57690 487433 0 0 3 0x14280 nfsidl nfsio 10953 136602 0 0 3 0x14280 nfsidl nfsio 20161 515289 0 0 3 0x14280 nfsidl nfsio 75806 522730 0 0 3 0x14280 nfsidl nfsio 62971 14598 0 0 3 0x14280 nfsidl nfsio 97478 132097 0 0 3 0x14280 nfsidl nfsio 38384 107228 0 0 3 0x14280 nfsidl nfsio 90584 382350 0 0 3 0x14280 nfsidl nfsio 10838 208381 0 0 3 0x14280 nfsidl nfsio 74964 185673 0 0 3 0x14280 nfsidl nfsio 65565 278513 0 0 3 0x14280 nfsidl nfsio 82552 358982 0 0 3 0x14280 nfsidl nfsio 8958 482403 0 0 3 0x14200 bored sosplice 87952 79031 1 0 3 0x100083 ttyin getty 94430 81988 17060 0 3 0x82 nanoslp syz-executor.6 86820 307233 17060 0 3 0x82 nanoslp syz-executor.7 83151 262233 17060 0 3 0x82 nanoslp syz-executor.4 95890 456198 17060 0 3 0x82 nanoslp syz-executor.3 60618 452477 17060 0 3 0x82 nanoslp syz-executor.2 77834 336885 17060 0 3 0x82 nanoslp syz-executor.0 77538 214226 17060 0 3 0x82 nanoslp syz-executor.1 17060 417916 86661 0 3 0x2000082 wait syz-fuzzer 17060 69084 86661 0 3 0x6000082 nanoslp syz-fuzzer 17060 26497 86661 0 3 0x6000082 thrsleep syz-fuzzer 17060 97217 86661 0 3 0x6000082 thrsleep syz-fuzzer 17060 324463 86661 0 3 0x6000082 wait syz-fuzzer 17060 468544 86661 0 3 0x6000082 wait syz-fuzzer 17060 443590 86661 0 3 0x6000082 wait syz-fuzzer 17060 323865 86661 0 3 0x6000082 wait syz-fuzzer 17060 83642 86661 0 3 0x6000082 kqread syz-fuzzer 17060 77003 86661 0 3 0x6000082 wait syz-fuzzer 17060 192985 86661 0 3 0x6000082 thrsleep syz-fuzzer 17060 45251 86661 0 3 0x6000082 wait syz-fuzzer 17060 47344 86661 0 3 0x6000082 thrsleep syz-fuzzer 17060 219697 86661 0 3 0x6000082 thrsleep syz-fuzzer 86661 183471 90382 0 3 0x10008a sigsusp ksh 90382 373010 64382 0 3 0x9a kqread sshd 64382 99794 1 0 3 0x88 kqread sshd 69374 44746 13641 73 3 0x1100090 kqread syslogd 13641 71393 1 0 3 0x100082 netio syslogd 24006 69839 1 0 3 0x100080 kqread resolvd 43531 217436 80344 77 3 0x100092 kqread dhcpleased 40237 157487 80344 77 3 0x100092 kqread dhcpleased 80344 67885 1 0 3 0x80 kqread dhcpleased 17410 175194 0 0 3 0x14200 bored smr 7715 120121 0 0 2 0x14200 zerothread 28599 446752 0 0 3 0x14200 aiodoned aiodoned 96328 357560 0 0 3 0x14200 syncer update 32424 289479 0 0 3 0x14200 cleaner cleaner 22039 243727 0 0 3 0x14200 reaper reaper 34449 211191 0 0 3 0x14200 pgdaemon pagedaemon 93185 93369 0 0 3 0x14200 bored viomb 46925 107374 0 0 3 0x40014200 acpi0 acpi0 78411 365727 0 0 3 0x14200 bored softnet3 10950 137672 0 0 3 0x14200 bored softnet2 53292 250465 0 0 3 0x14200 bored softnet1 20913 440468 0 0 3 0x14200 bored softnet0 2866 381020 0 0 3 0x14200 bored systqmp 37735 334981 0 0 3 0x14200 bored systq 30305 464609 0 0 3 0x40014200 tmoslp softclock 15668 150297 0 0 3 0x40014200 idle0 1 12211 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 10167 6409K 6851K 166960K 12992 0 pcb 15 14K 16K 166960K 201 0 rtable 195 6K 7K 166960K 468 0 pf 28 8K 8K 166960K 47 0 ifaddr 36 10K 11K 166960K 53 0 ifgroup 47 2K 2K 166960K 80 0 counters 29 17K 17K 166960K 36 0 ioctlops 0 0K 2K 166960K 80 0 iov 0 0K 12K 166960K 38 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1339 84K 84K 166960K 1646 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 334 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 15 53K 77K 166960K 1028 0 sigio 0 0K 0K 166960K 126 0 proc 56 58K 83K 166960K 529 0 subproc 91 5K 6K 166960K 104 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 205 0 in_multi 77 5K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 614 0 tdb 3 0K 0K 166960K 3 0 pagedep 1 8K 8K 166960K 1 0 inodedep 1 32K 32K 166960K 1 0 newblk 1 0K 0K 166960K 1 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 329 160K 184K 166960K 12168 0 UVM aobj 128 3K 3K 166960K 134 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 21 0 NDP 10 0K 1K 166960K 33 0 temp 69 6699K 6764K 166960K 14880 0 kqueue 12 18K 24K 166960K 77 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 120 135 0 132 3 1 2 2 0 8 1 rtentry 112 123 0 34 4 0 4 4 0 8 0 unpcb 144 690 0 673 13 5 8 8 0 8 7 syncache 312 21 0 21 4 3 1 1 0 8 1 tcpqe 32 428 0 428 4 4 0 1 0 8 0 tcpcb 808 345 0 318 16 12 4 10 0 8 1 arp 88 21 0 7 1 0 1 1 0 8 0 inpcb 336 915 0 885 24 15 9 13 0 8 6 nd6 104 26 0 6 1 0 1 1 0 8 0 pkpcb 40 10 0 10 2 2 0 1 0 8 0 kcovpl 48 8 0 1 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 460 0 92 29 4 25 29 0 8 0 art_table 32 461 0 92 4 0 4 4 0 8 0 art_node 16 118 0 38 1 0 1 1 0 8 0 sysvmsgpl 40 50 0 10 1 0 1 1 0 8 0 semapl 112 331 0 321 1 0 1 1 0 8 0 shmpl 112 131 0 6 4 0 4 4 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2625 0 1186 91 0 91 91 0 8 0 ffsino 240 2625 0 1186 85 0 85 85 0 8 0 nchpl 144 4188 0 2560 63 0 63 63 0 8 0 uvmvnodes 80 3038 0 0 62 0 62 62 0 8 0 vnodes 216 3038 0 0 169 0 169 169 0 8 0 namei 1024 13919 0 13916 3 2 1 3 0 8 0 vcpupl 2048 42 0 1 6 0 6 6 0 8 0 vmpool 664 42 0 1 4 0 4 4 0 8 0 kstatmem 264 34 0 14 2 0 2 2 0 8 0 scxspl 216 14185 0 14184 11 10 1 8 1 8 0 plimitpl 152 165 0 151 1 0 1 1 0 8 0 sigapl 424 1510 0 1446 8 0 8 8 0 8 0 futexpl 64 9363 0 9356 1 0 1 1 0 8 0 knotepl 120 13563 0 13487 6 2 4 6 0 8 0 kqueuepl 184 212 0 204 5 4 1 4 0 8 0 pipepl 288 236 0 211 3 0 3 3 0 8 0 fdescpl 432 1313 0 1287 4 0 4 4 0 8 0 filepl 120 6892 0 6668 18 4 14 14 0 8 5 lockfpl 104 527 0 525 1 0 1 1 0 8 0 lockfspl 48 254 0 252 1 0 1 1 0 8 0 sessionpl 144 24 0 9 1 0 1 1 0 8 0 pgrppl 48 29 0 14 1 0 1 1 0 8 0 ucredpl 104 637 0 625 1 0 1 1 0 8 0 zombiepl 144 1447 0 1446 1 0 1 1 0 8 0 processpl 1072 1510 0 1446 5 0 5 5 0 8 0 procpl 680 3182 0 3096 8 0 8 8 0 8 0 sosppl 168 9 0 6 1 0 1 1 0 8 0 sockpl 456 1750 0 1700 49 18 31 31 0 8 24 mcl64k 65536 42 0 42 1 0 1 1 0 8 1 mcl16k 16384 18 0 18 2 1 1 1 0 8 1 mcl12k 12288 30 0 30 3 2 1 1 0 8 1 mcl9k 9216 11 0 11 4 4 0 1 0 8 0 mcl8k 8192 122 0 122 2 1 1 1 0 8 1 mcl4k 4096 119 0 118 2 1 1 1 0 8 0 mcl2k2 2112 8 0 8 2 2 0 1 0 8 0 mcl2k 2048 69476 0 69433 47 40 7 32 0 8 0 mtagpl 96 209 0 24 6 1 5 5 0 8 0 mbufpl 256 122456 0 122134 100 70 30 84 0 8 8 bufpl 288 5913 0 144 413 0 413 413 0 8 0 anonpl 24 283436 0 269769 94 4 90 93 0 188 7 amapchunkpl 152 40140 0 39154 43 5 38 41 0 158 0 amappl16 200 7105 0 6745 23 1 22 22 0 8 0 amappl15 192 9 0 9 1 1 0 1 0 8 0 amappl14 184 151 0 140 2 1 1 2 0 8 0 amappl13 176 32 0 31 1 0 1 1 0 8 0 amappl12 168 1944 0 1916 2 0 2 2 0 8 0 amappl11 160 60 0 50 1 0 1 1 0 8 0 amappl10 152 31 0 21 1 0 1 1 0 8 0 amappl9 144 149 0 148 2 1 1 1 0 8 0 amappl8 136 211 0 156 2 0 2 2 0 8 0 amappl7 128 165 0 144 2 0 2 2 0 8 0 amappl6 120 239 0 232 1 0 1 1 0 8 0 amappl5 112 153 0 143 1 0 1 1 0 8 0 amappl4 104 412 0 391 2 1 1 2 0 8 0 amappl3 96 8162 0 8074 3 0 3 3 0 8 0 amappl2 88 1779 0 1712 3 1 2 3 0 8 0 amappl1 80 12861 0 12357 22 10 12 22 0 8 0 amappl 88 11640 0 11415 6 0 6 6 0 92 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 72 133 0 6 3 0 3 3 0 8 0 uaddrrnd 24 1355 0 1288 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1355 0 1288 1 0 1 1 0 8 0 vmmpekpl 168 15625 0 15567 3 0 3 3 0 8 0 vmmpepl 168 98866 0 96718 133 33 100 132 0 357 3 vmsppl 352 1354 0 1288 7 0 7 7 0 8 0 rwobjpl 24 34764 0 30243 28 0 28 28 0 8 0 pdppl 4096 2716 0 2617 181 81 100 105 0 8 1 pvpl 32 625135 0 605772 334 50 284 334 0 265 127 pmappl 216 1354 0 1288 4 0 4 4 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1024 0 232 25 0 25 25 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8284c9fe) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828d358e,ffffffff82878c97,6ae,ffffffff828cd854) at __assert+0x29 sys/kern/subr_prf.c:157 bufcache_take(fffffd806d045810) at bufcache_take+0x244 sys/kern/vfs_bio.c:1711 getblk(fffffd806be35720,0,4000,0,ffffffffffffffff) at getblk+0x191 sys/kern/vfs_bio.c:1050 bread(fffffd806be35720,0,4000,ffff800037888bd0) at bread+0x3e bio_doread sys/kern/vfs_bio.c:433 [inline] bread(fffffd806be35720,0,4000,ffff800037888bd0) at bread+0x3e sys/kern/vfs_bio.c:478 ffs_bufatoff(fffffd8061a64f00,0,0,ffff800037888c88) at ffs_bufatoff+0x129 sys/ufs/ffs/ffs_subr.c:71 ufs_lookup() at ufs_lookup+0x466 sys/ufs/ufs/ufs_lookup.c:256 VOP_LOOKUP(fffffd806be35720,ffff800037889108,ffff800037889138) at VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 vfs_lookup(ffff8000378890d8) at vfs_lookup+0x6dc sys/kern/vfs_lookup.c:566 namei(ffff8000378890d8) at namei+0x55a sys/kern/vfs_lookup.c:250 vn_open(ffff8000378890d8,201,0) at vn_open+0x17b sys/kern/vfs_vnops.c:107 doopenat(ffff80002a6c9d40,ffffff9c,20000040,200,0,ffff8000378892a0) at doopenat+0x26e sys/kern/vfs_syscalls.c:1126 syscall(ffff800037889360) at syscall+0x5ef sys/arch/amd64/amd64/trap.c:591 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdf6e5bc03a0, count: -15 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8284c9fe) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828d358e,ffffffff82878c97,6ae,ffffffff828cd854) at __assert+0x29 sys/kern/subr_prf.c:157 bufcache_take(fffffd806d045810) at bufcache_take+0x244 sys/kern/vfs_bio.c:1711 getblk(fffffd806be35720,0,4000,0,ffffffffffffffff) at getblk+0x191 sys/kern/vfs_bio.c:1050 bread(fffffd806be35720,0,4000,ffff800037888bd0) at bread+0x3e bio_doread sys/kern/vfs_bio.c:433 [inline] bread(fffffd806be35720,0,4000,ffff800037888bd0) at bread+0x3e sys/kern/vfs_bio.c:478 ffs_bufatoff(fffffd8061a64f00,0,0,ffff800037888c88) at ffs_bufatoff+0x129 sys/ufs/ffs/ffs_subr.c:71 ufs_lookup() at ufs_lookup+0x466 sys/ufs/ufs/ufs_lookup.c:256 VOP_LOOKUP(fffffd806be35720,ffff800037889108,ffff800037889138) at VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 vfs_lookup(ffff8000378890d8) at vfs_lookup+0x6dc sys/kern/vfs_lookup.c:566 namei(ffff8000378890d8) at namei+0x55a sys/kern/vfs_lookup.c:250 vn_open(ffff8000378890d8,201,0) at vn_open+0x17b sys/kern/vfs_vnops.c:107 doopenat(ffff80002a6c9d40,ffffff9c,20000040,200,0,ffff8000378892a0) at doopenat+0x26e sys/kern/vfs_syscalls.c:1126 syscall(ffff800037889360) at syscall+0x5ef sys/arch/amd64/amd64/trap.c:591 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdf6e5bc03a0, count: -15