uvm_fault(0xfffffd8068456010, 0x8, 0, 1) -> e kernel: page fault trap, code=0 Stopped at fifo_write+0x4e: movq 0x8(%rax),%r12 TID PID UID PRFLAGS PFLAGS CPU COMMAND * 51585 83196 32767 0x10 0x4000000 0 syz-executor.3 50163 10912 32767 0x10 0 1 syz-executor.1 fifo_write(ffff800027b558a0) at fifo_write+0x4e sys/miscfs/fifofs/fifo_vnops.c:278 VOP_WRITE(fffffd8067cae340,ffff800027b55938,8,fffffd807f7d8540) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8067cae340,ffff8000211a6800,78,0,1,fa4be1d6e1fa1381,ffff800027b55a60,fffffd8067cae340,78) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:330 ufs_symlink(ffff800027b55a60) at ufs_symlink+0x129 sys/ufs/ufs/ufs_vnops.c:1398 VOP_SYMLINK(fffffd80625fbbf0,ffff800027b55be0,ffff800027b55c10,ffff800027b55b10,ffff8000211a6800) at VOP_SYMLINK+0xd0 sys/kern/vfs_vops.c:442 dosymlinkat(ffff800022cbad28,200000c0,4,20d06ff8) at dosymlinkat+0x154 sys/kern/vfs_syscalls.c:1803 syscall(ffff800027b55d90) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800027b55d90) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa35f7ee2080, count: 7 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 *cpu0: uvm_fault(0xfffffd8068456010, 0x8, 0, 1) -> e ddb{0}> trace fifo_write(ffff800027b558a0) at fifo_write+0x4e sys/miscfs/fifofs/fifo_vnops.c:278 VOP_WRITE(fffffd8067cae340,ffff800027b55938,8,fffffd807f7d8540) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8067cae340,ffff8000211a6800,78,0,1,fa4be1d6e1fa1381,ffff800027b55a60,fffffd8067cae340,78) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:330 ufs_symlink(ffff800027b55a60) at ufs_symlink+0x129 sys/ufs/ufs/ufs_vnops.c:1398 VOP_SYMLINK(fffffd80625fbbf0,ffff800027b55be0,ffff800027b55c10,ffff800027b55b10,ffff8000211a6800) at VOP_SYMLINK+0xd0 sys/kern/vfs_vops.c:442 dosymlinkat(ffff800022cbad28,200000c0,4,20d06ff8) at dosymlinkat+0x154 sys/kern/vfs_syscalls.c:1803 syscall(ffff800027b55d90) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800027b55d90) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa35f7ee2080, count: -8 ddb{0}> show registers rdi 0xffff8000260ee000 rsi 0x15cc __ALIGN_SIZE+0x5cc rbp 0xffff800027b55890 rbx 0x8 rdx 0xffff8000260ee000 rcx 0x15cb __ALIGN_SIZE+0x5cb rax 0 r8 0 r9 0x1 r10 0xfffffd807f7d8540 r11 0xe911d561c7bad7c0 r12 0x1 r13 0xffff800027b55938 r14 0xffff800027b558a0 r15 0xfffffd8067cae340 rip 0xffffffff81687ade fifo_write+0x4e cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800027b55850 ss 0x10 fifo_write+0x4e: movq 0x8(%rax),%r12 ddb{0}> show proc PROC (syz-executor.3) pid=51585 stat=onproc flags process=10 proc=4000000 pri=17, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff6fd0,0xffffffff8290de08 process=0xffff80002125cc90 user=0xffff800027b50000, vmspace=0xfffffd8068456010 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 83196 325179 71070 32767 2 0x10 syz-executor.3 *83196 51585 71070 32767 7 0x4000010 syz-executor.3 5848 253427 10912 32767 3 0x90 nanoslp syz-executor.1 5848 306061 10912 32767 3 0x4000090 netcon2 syz-executor.1 5848 183437 10912 32767 3 0x4000090 fsleep syz-executor.1 18369 312044 35475 32767 2 0x10 syz-executor.2 35475 318131 19885 0 3 0x82 wait syz-executor.2 71070 199296 47020 32767 2 0x490 syz-executor.3 47020 400225 19885 0 3 0x82 wait syz-executor.3 10912 50163 77768 32767 7 0x10 syz-executor.1 77768 462462 19885 0 3 0x82 wait syz-executor.1 49021 189047 11543 32767 2 0x10 syz-executor.0 11543 9884 19885 0 3 0x82 wait syz-executor.0 67613 165004 0 0 3 0x14200 bored sosplice 19885 90838 77344 0 3 0x82 thrsleep syz-fuzzer 19885 152993 77344 0 3 0x4000082 nanoslp syz-fuzzer 19885 119614 77344 0 3 0x4000082 thrsleep syz-fuzzer 19885 240214 77344 0 3 0x4000082 thrsleep syz-fuzzer 19885 451033 77344 0 3 0x4000082 thrsleep syz-fuzzer 19885 68823 77344 0 3 0x4000082 nanoslp syz-fuzzer 19885 258574 77344 0 3 0x4000082 thrsleep syz-fuzzer 19885 390715 77344 0 3 0x4000082 thrsleep syz-fuzzer 19885 2637 77344 0 3 0x4000082 thrsleep syz-fuzzer 19885 417924 77344 0 3 0x4000082 kqread syz-fuzzer 77344 482509 38170 0 3 0x10008a sigsusp ksh 38170 266482 37704 0 3 0x9a poll sshd 14778 194616 1 0 3 0x100083 ttyin getty 37704 57306 1 0 3 0x88 poll sshd 57163 59919 74792 73 3 0x100090 kqread syslogd 74792 90854 1 0 3 0x100082 netio syslogd 54991 409042 1 0 3 0x100080 kqread resolvd 73631 121896 15137 77 3 0x100092 kqread dhcpleased 44959 488371 15137 77 3 0x100092 kqread dhcpleased 15137 393533 1 0 3 0x80 kqread dhcpleased 2474 116518 0 0 3 0x14200 bored smr 23884 244813 0 0 3 0x14200 pgzero zerothread 16543 462855 0 0 3 0x14200 aiodoned aiodoned 96428 417767 0 0 3 0x14200 syncer update 59023 86621 0 0 3 0x14200 cleaner cleaner 26981 402737 0 0 3 0x14200 reaper reaper 29327 113044 0 0 3 0x14200 pgdaemon pagedaemon 38851 268623 0 0 3 0x14200 bored viomb 394 519592 0 0 3 0x40014200 acpi0 acpi0 19128 18739 0 0 3 0x40014200 idle1 9252 404824 0 0 3 0x14200 bored softnet 78051 315211 0 0 3 0x14200 bored systqmp 73526 249160 0 0 3 0x14200 bored systq 88061 335364 0 0 2 0x40014200 softclock 123 415780 0 0 3 0x40014200 idle0 1 445489 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 83196 (syz-executor.3) thread 0xffff800022cbad28 (51585) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff829177a0) #0 witness_lock+0x44d #1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 #2 mi_switch+0x3d3 sys/kern/sched_bsd.c:416 #3 sleep_finish+0x1b2 sys/kern/kern_synch.c:433 #4 tsleep+0x12c sys/kern/kern_synch.c:158 #5 biowait+0x91 sys/kern/vfs_bio.c:1271 #6 bwrite+0x21b sys/kern/vfs_bio.c:772 #7 VOP_BWRITE+0x4a sys/kern/vfs_vops.c:656 #8 ufs_direnter+0x8fa sys/ufs/ufs/ufs_lookup.c:909 #9 ufs_makeinode+0x4cc sys/ufs/ufs/ufs_vnops.c:1868 #10 ufs_symlink+0x47 sys/ufs/ufs/ufs_vnops.c:1382 #11 VOP_SYMLINK+0xd0 sys/kern/vfs_vops.c:442 #12 dosymlinkat+0x154 sys/kern/vfs_syscalls.c:1803 #13 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e523708) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vget+0x1d3 sys/kern/vfs_subr.c:677 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1318 #8 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #9 ufs_makeinode+0xae sys/ufs/ufs/ufs_vnops.c:1830 #10 ufs_symlink+0x47 sys/ufs/ufs/ufs_vnops.c:1382 #11 VOP_SYMLINK+0xd0 sys/kern/vfs_vops.c:442 #12 dosymlinkat+0x154 sys/kern/vfs_syscalls.c:1803 #13 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #14 Xsyscall+0x128 Process 18369 (syz-executor.2) thread 0xffff800022cba7e8 (312044) exclusive rrwlock inode r = 0 (0xfffffd807e1aa700) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vget+0x1d3 sys/kern/vfs_subr.c:677 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1318 #8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6e5 sys/kern/vfs_lookup.c:561 #11 namei+0x36a sys/kern/vfs_lookup.c:245 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1849 #13 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd807e1aa0a0) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1849 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 Process 49021 (syz-executor.0) thread 0xffff800022cba008 (189047) exclusive rrwlock inode r = 0 (0xfffffd806e523e78) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1347 #6 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #8 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404 #9 domkdirat+0x121 sys/kern/vfs_syscalls.c:3065 #10 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #10 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8068f65918) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3050 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10179 6402K 6416K 78643K 11328 0 pcb 13 16K 20K 78643K 19 0 rtable 168 5K 5K 78643K 2153 0 ifaddr 53 12K 12K 78643K 188 0 sysctl 3 1K 1K 78643K 3 0 counters 48 34K 34K 78643K 86 0 ioctlops 0 0K 2K 78643K 171 0 iov 0 0K 28K 78643K 2947 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1231 77K 77K 78643K 7931 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 215 0 VM map 2 1K 1K 78643K 2 0 sem 11 1K 1K 78643K 17 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 12 41K 65K 78643K 24045 0 sigio 0 0K 0K 78643K 339 0 proc 56 74K 99K 78643K 2383 0 subproc 52 3K 3K 78643K 299 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1864 0 in_multi 55 3K 4K 78643K 677 0 ether_multi 1 0K 0K 78643K 154 0 mrt 1 0K 0K 78643K 5 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 355 1579K 1579K 78643K 355 0 exec 0 0K 2K 78643K 2975 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 370 58K 76K 78643K 313425 0 UVM aobj 131 4K 4K 78643K 138 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 587 0 NDP 7 0K 1K 78643K 72 0 temp 93 4197K 4325K 78643K 58798 0 kqueue 10 14K 26K 78643K 1513 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 1935 0 1932 27 26 1 5 0 8 0 rtentry 112 322 0 247 4 1 3 3 0 8 0 unpcb 128 17201 0 17188 167 166 1 9 0 8 0 syncache 296 229 0 229 47 46 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 77 0 77 29 29 0 1 0 8 0 tcpcb 736 25561 0 25545 520 509 11 22 0 8 8 arp 120 53 0 42 1 0 1 1 0 8 0 ipq 40 45 0 44 16 15 1 1 0 8 0 ipqe 40 655 0 654 16 15 1 1 0 8 0 inpcb 304 34934 0 34917 342 332 10 16 0 8 8 rttmr 72 46 0 44 2 1 1 1 0 8 0 ip6q 72 25 0 25 10 9 1 1 0 8 1 ip6af 40 50 0 50 10 9 1 1 0 8 1 nd6 48 107 0 89 1 0 1 1 0 8 0 kcovpl 48 23 0 19 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1436 0 1069 35 12 23 26 0 8 0 art_table 32 1437 0 1069 4 0 4 4 0 8 0 art_node 16 321 0 252 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 6 2 2 0 1 0 8 0 semupl 112 7 0 7 1 1 0 1 0 8 0 semapl 112 9 0 0 1 0 1 1 0 8 0 shmpl 112 135 0 7 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 35517 0 34068 91 0 91 91 0 8 0 ffsino 272 35517 0 34068 98 0 98 98 0 8 0 nchpl 144 69488 0 67893 61 0 61 61 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 227402 0 227400 4 3 1 1 0 8 0 percpumem 16 55 0 19 1 0 1 1 0 8 0 scxspl 216 200623 0 200623 52 51 1 8 0 8 1 plimitpl 152 4545 0 4531 1 0 1 1 0 8 0 sigapl 424 24199 0 24161 5 0 5 5 0 8 0 futexpl 64 201384 0 201383 4 3 1 1 0 8 0 knotepl 112 236 0 0 3 0 3 3 0 8 0 kqueuepl 216 8812 0 8797 162 157 5 8 0 8 4 pipepl 336 7191 0 7175 168 161 7 10 0 8 5 fdescpl 496 24184 0 24161 7 3 4 4 0 8 0 filepl 152 180900 0 180750 291 280 11 18 0 8 5 lockfpl 104 3957 0 3954 5 4 1 2 0 8 0 lockfspl 48 1094 0 1091 1 0 1 1 0 8 0 sessionpl 144 38 0 26 1 0 1 1 0 8 0 pgrppl 48 273 0 261 1 0 1 1 0 8 0 ucredpl 96 34390 0 34376 1 0 1 1 0 8 0 zombiepl 144 24161 0 24161 1 0 1 1 0 8 1 processpl 1064 24199 0 24161 4 1 3 3 0 8 0 procpl 672 72301 0 72251 51 44 7 7 0 8 2 sosppl 168 295 0 293 38 37 1 1 0 8 0 sockpl 480 55120 0 55089 1038 1026 12 34 0 8 8 mcl64k 65536 62 0 0 4 1 3 3 0 8 0 mcl16k 16384 28 0 0 4 2 2 3 0 8 0 mcl12k 12288 73 0 0 2 0 2 2 0 8 0 mcl9k 9216 18 0 0 2 0 2 2 0 8 0 mcl8k 8192 33 0 0 4 1 3 3 0 8 0 mcl4k 4096 49 0 0 5 2 3 3 0 8 0 mcl2k2 2112 14 0 0 1 0 1 1 0 8 0 mcl2k 2048 403 0 0 22 9 13 22 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 7000 0 0 420 0 420 420 0 8 0 bufpl 288 43928 0 37586 454 0 454 454 0 8 0 anonpl 24 7269526 0 7256348 422 315 107 131 0 186 7 amapchunkpl 152 821835 0 821222 283 250 33 40 0 158 2 amappl16 200 82116 0 81738 430 401 29 46 0 8 7 amappl15 192 4072 0 4070 4 3 1 1 0 8 0 amappl14 184 2814 0 2809 3 2 1 1 0 8 0 amappl13 176 1614 0 1612 1 0 1 1 0 8 0 amappl12 168 2256 0 2251 1 0 1 1 0 8 0 amappl11 160 2177 0 2166 1 0 1 1 0 8 0 amappl10 152 7144 0 7134 1 0 1 1 0 8 0 amappl9 144 781 0 778 1 0 1 1 0 8 0 amappl8 136 6007 0 5841 6 0 6 6 0 8 0 amappl7 128 4733 0 4719 1 0 1 1 0 8 0 amappl6 120 574 0 550 1 0 1 1 0 8 0 amappl5 112 30393 0 30376 1 0 1 1 0 8 0 amappl4 104 4431 0 4401 1 0 1 1 0 8 0 amappl3 96 4378 0 4361 1 0 1 1 0 8 0 amappl2 88 3130 0 3086 2 0 2 2 0 8 0 amappl1 80 446031 0 445536 16 4 12 12 0 8 1 amappl 88 311799 0 311593 8 2 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 72 137 0 7 3 0 3 3 0 8 0 uaddrrnd 24 24184 0 24161 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 24184 0 24161 1 0 1 1 0 8 0 vmmpekpl 168 193038 0 192992 3 0 3 3 0 8 0 vmmpepl 168 2241615 0 2239533 381 276 105 119 0 357 4 vmsppl 368 24183 0 24161 3 0 3 3 0 8 0 rwobjpl 56 564675 0 557327 144 37 107 111 0 8 0 pdppl 4096 48376 0 48322 108 50 58 66 0 8 4 pvpl 32 11616534 0 11599221 766 586 180 213 0 265 14 pmappl 248 24183 0 24161 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 1947 0 752 37 2 35 35 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace fifo_write(ffff800027b558a0) at fifo_write+0x4e sys/miscfs/fifofs/fifo_vnops.c:278 VOP_WRITE(fffffd8067cae340,ffff800027b55938,8,fffffd807f7d8540) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8067cae340,ffff8000211a6800,78,0,1,fa4be1d6e1fa1381,ffff800027b55a60,fffffd8067cae340,78) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:330 ufs_symlink(ffff800027b55a60) at ufs_symlink+0x129 sys/ufs/ufs/ufs_vnops.c:1398 VOP_SYMLINK(fffffd80625fbbf0,ffff800027b55be0,ffff800027b55c10,ffff800027b55b10,ffff8000211a6800) at VOP_SYMLINK+0xd0 sys/kern/vfs_vops.c:442 dosymlinkat(ffff800022cbad28,200000c0,4,20d06ff8) at dosymlinkat+0x154 sys/kern/vfs_syscalls.c:1803 syscall(ffff800027b55d90) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800027b55d90) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa35f7ee2080, count: -8 ddb{0}> machine ddbcpu 1