uvm_fault(0xfffffd8072dab530, 0x8, 0, 1) -> e kernel: page fault trap, code=0 Stopped at fifo_write+0x6e: movq 0x8(%rax),%r15 TID PID UID PRFLAGS PFLAGS CPU COMMAND 271013 92002 32767 0x10 0 0 syz-executor *408003 52136 32767 0x10 0x4000000 1K syz-executor fifo_write(ffff80002a0d0200) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd8074b462e0,ffff80002a0d0298,8,fffffd807f7d35b0) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8074b462e0,ffff80002a041000,104,0,1,89a0afaed7d6bf6,ffff80002a0d03c0,fffffd8074b462e0,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff80002a0d03c0) at ufs_symlink+0x1ee sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd805d4df8a0,ffff80002a0d0540,ffff80002a0d0570,ffff80002a0d0470,ffff80002a041000) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff800030996558,20000e80,6,20000d80) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff80002a0d06f0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a0d06f0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x37684aa7f80, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd8072dab530, 0x8, 0, 1) -> e ddb{1}> trace fifo_write(ffff80002a0d0200) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd8074b462e0,ffff80002a0d0298,8,fffffd807f7d35b0) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8074b462e0,ffff80002a041000,104,0,1,89a0afaed7d6bf6,ffff80002a0d03c0,fffffd8074b462e0,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff80002a0d03c0) at ufs_symlink+0x1ee sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd805d4df8a0,ffff80002a0d0540,ffff80002a0d0570,ffff80002a0d0470,ffff80002a041000) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff800030996558,20000e80,6,20000d80) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff80002a0d06f0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a0d06f0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x37684aa7f80, count: -8 ddb{1}> show registers rdi 0xfffffd8074b462e0 rsi 0x204b __ALIGN_SIZE+0x104b rbp 0xffff80002a0d01f0 rbx 0xfffffd8074b462e0 rdx 0xffff80002c731000 rcx 0x204a __ALIGN_SIZE+0x104a rax 0 r8 0 r9 0x1 r10 0xffff800029b7bff0 r11 0xed6d301f7e61371f r12 0x4000 __ALIGN_SIZE+0x3000 r13 0xffff80002a0d0298 r14 0xffff80002a0d0200 r15 0x1 rip 0xffffffff81faec7e fifo_write+0x6e cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a0d01c0 ss 0x10 fifo_write+0x6e: movq 0x8(%rax),%r15 ddb{1}> show proc PROC (syz-executor) tid=408003 pid=52136 tcnt=3 stat=onproc flags process=10 proc=4000000 runpri=17, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800030996f78,0xffff800030997c30 process=0xffff800030998920 user=0xffff80002a0cb000, vmspace=0xfffffd8072dab530 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 28766 20561 47187 32767 2 0x10 syz-executor 33208 63407 61258 32767 2 0x10 syz-executor 92002 271013 71444 32767 7 0x10 syz-executor 92002 39526 71444 32767 2 0x4000010 syz-executor 10613 107711 74493 32767 2 0x10 syz-executor 52136 329461 75534 32767 2 0x10 syz-executor 52136 481379 75534 32767 3 0x4000090 sbwait syz-executor *52136 408003 75534 32767 7 0x4000010 syz-executor 53836 464901 26580 32767 2 0x10 syz-executor 53836 489055 26580 32767 3 0x4000090 netacc syz-executor 53836 254366 26580 32767 2 0x4000010 syz-executor 75534 8426 54041 32767 3 0x90 nanoslp syz-executor 54041 74418 54789 0 3 0x82 wait syz-executor 24561 28455 49735 32767 3 0x90 wait syz-executor 49735 142996 54789 0 3 0x82 wait syz-executor 74493 337993 31 32767 3 0x90 nanoslp syz-executor 31 489904 54789 0 3 0x82 wait syz-executor 71444 426550 1905 32767 3 0x90 nanoslp syz-executor 1905 352470 54789 0 3 0x82 wait syz-executor 47187 319776 35134 32767 3 0x90 nanoslp syz-executor 35134 58761 54789 0 3 0x82 wait syz-executor 26580 100863 85521 32767 3 0x90 nanoslp syz-executor 85521 78292 54789 0 3 0x82 wait syz-executor 61258 344315 25090 32767 3 0x90 nanoslp syz-executor 25090 310710 54789 0 3 0x82 wait syz-executor 94435 489649 56332 32767 3 0x10 biowait syz-executor 56332 244776 54789 0 3 0x82 wait syz-executor 94488 75542 76446 0 3 0x100082 sbwait arp 76446 394005 80093 0 3 0x10008a sigsusp sh 80093 465891 1 0 3 0x80 wait syz-executor 48452 292737 25137 0 3 0x100082 sbwait arp 25137 318370 6169 0 3 0x10008a sigsusp sh 6169 300968 1 0 3 0x80 wait syz-executor 16224 477583 0 0 3 0x14200 bored sosplice 54789 509725 65161 0 2 0x2 syz-executor 65161 433143 55180 0 3 0x10008a sigsusp ksh 55180 472120 8008 0 3 0x98 kqread sshd-session 8008 79359 93963 0 3 0x92 kqread sshd-session 36848 193140 1 0 3 0x100083 ttyin getty 93963 28554 1 0 3 0x88 kqread sshd 12995 427519 93385 73 3 0x1100090 kqread syslogd 93385 398512 1 0 3 0x100082 sbwait syslogd 52788 234181 1 0 3 0x100080 kqread resolvd 73549 477245 62988 77 3 0x100092 kqread dhcpleased 87192 439517 62988 77 3 0x100092 kqread dhcpleased 62988 4966 1 0 3 0x80 kqread dhcpleased 2473 260136 0 0 3 0x14200 bored smr 61586 249209 0 0 2 0x14200 zerothread 21948 117137 0 0 3 0x14200 aiodoned aiodoned 72059 448371 0 0 3 0x14200 syncer update 65928 476609 0 0 3 0x14200 cleaner cleaner 66339 148535 0 0 3 0x14200 reaper reaper 54384 68593 0 0 3 0x14200 pgdaemon pagedaemon 34676 302010 0 0 3 0x14200 bored viomb 95111 442061 0 0 3 0x40014200 acpi0 acpi0 24499 234585 0 0 3 0x40014200 idle1 60964 41223 0 0 3 0x14200 bored softnet3 48015 283204 0 0 3 0x14200 bored softnet2 58948 106778 0 0 3 0x14200 bored softnet1 35849 386926 0 0 3 0x14200 bored softnet0 75566 437106 0 0 3 0x14200 bored systqmp 50769 341721 0 0 3 0x14200 bored systq 22296 334118 0 0 3 0x14200 tmoslp softclockmp 84080 332637 0 0 3 0x40014200 tmoslp softclock 55483 120391 0 0 3 0x40014200 idle0 1 339866 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 52136 (syz-executor) thread 0xffff800030996558 (408003) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83543d28) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 __mp_acquire_count+0x58 #2 mi_switch+0x658 sys/kern/sched_bsd.c:460 #3 sleep_finish+0x219 sys/kern/kern_synch.c:416 #4 biowait+0xc1 sys/kern/vfs_bio.c:1254 #5 bwrite+0x2e2 sys/kern/vfs_bio.c:766 #6 VOP_BWRITE+0x60 sys/kern/vfs_vops.c:646 #7 ufs_direnter+0x7d1 sys/ufs/ufs/ufs_lookup.c:833 #8 ufs_makeinode+0x51e sys/ufs/ufs/ufs_vnops.c:1764 #9 ufs_symlink+0x54 sys/ufs/ufs/ufs_vnops.c:1293 #10 VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 #11 dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 #12 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #12 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #13 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8076002d58) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vget+0x2bd sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x171 sys/ufs/ufs/ufs_ihash.c:95 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393 #9 ufs_makeinode+0xcb sys/ufs/ufs/ufs_vnops.c:1728 #10 ufs_symlink+0x54 sys/ufs/ufs/ufs_vnops.c:1293 #11 VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 #12 dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 #13 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #13 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 Process 94435 (syz-executor) thread 0xffff8000ffff7968 (489649) exclusive rrwlock inode r = 0 (0xfffffd806aedbb48) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vget+0x2bd sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x171 sys/ufs/ufs/ufs_ihash.c:95 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1852 #13 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #13 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8050f8cd58) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1852 #8 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #8 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10220 10029K 10036K 166960K 12464 0 pcb 17 18K 20K 166960K 23 0 rtable 244 6K 7K 166960K 12885 0 pf 31 16K 16K 166960K 818 0 ifaddr 42 11K 13K 166960K 1590 0 ifgroup 50 2K 2K 166960K 1613 0 sysctl 4 1K 5K 166960K 77 0 counters 64 36K 36K 166960K 840 0 ioctlops 0 0K 2K 166960K 666 0 iov 0 0K 32K 166960K 1238 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1482 93K 93K 166960K 11059 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 13K 166960K 283 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 773 0 dirhash 21 4K 4K 166960K 237 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 31 117K 181K 166960K 17599 0 sigio 0 0K 0K 166960K 427 0 proc 56 78K 176K 166960K 12659 0 subproc 130 8K 13K 166960K 7124 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 3914 0 in_multi 99 7K 7K 166960K 4882 0 ether_multi 1 0K 0K 166960K 75 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 295 1314K 1314K 166960K 295 0 exec 0 0K 1K 166960K 7985 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 284 92K 148K 166960K 139450 0 UVM aobj 131 7K 7K 166960K 145 0 pinsyscall 54 108K 142K 166960K 28739 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 948 0 NDP 13 0K 2K 166960K 1176 0 temp 82 6824K 6953K 166960K 114949 0 kqueue 13 20K 35K 166960K 2322 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 24 0 0 1 0 1 1 0 8 0 rtpcb 120 2521 0 2516 16 15 1 3 0 8 0 rtentry 112 4465 0 4350 13 9 4 4 0 8 0 unpcb 144 15406 0 15388 106 102 4 9 0 8 3 syncache 336 100 0 100 30 29 1 1 0 8 1 tcpqe 32 36 0 36 19 19 0 1 0 8 0 tcpcb 808 8271 0 8261 130 122 8 14 0 8 6 arp 120 792 0 774 1 0 1 1 0 8 0 ipq 40 62 0 59 4 3 1 1 0 8 0 ipqe 40 437 0 434 4 3 1 1 0 8 0 inpcb 336 21073 0 21060 168 161 7 19 0 8 4 ip6q 72 1 0 1 1 1 0 1 0 8 0 ip6af 40 2 0 2 1 1 0 1 0 8 0 nd6 136 1308 0 1279 6 4 2 2 0 8 0 kcovpl 48 548 0 538 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 18165 0 17678 189 158 31 32 0 8 0 art_table 32 18166 0 17678 12 7 5 5 0 8 0 art_node 16 4464 0 4359 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 2 3 2 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 769 0 759 1 0 1 1 0 8 0 shmpl 112 142 0 14 4 0 4 4 0 8 0 dirhash 1024 174 0 147 10 6 4 4 0 8 0 dino2pl 256 20646 0 17906 172 0 172 172 0 8 0 ffsino 272 20646 0 17906 184 0 184 184 0 8 0 nchpl 144 36859 0 34246 98 0 98 98 0 8 0 uvmvnodes 80 9821 0 0 201 0 201 201 0 8 0 vnodes 216 9821 0 0 546 0 546 546 0 8 0 namei 1024 172497 0 172496 43 42 1 3 0 8 0 percpumem 16 434 0 388 1 0 1 1 0 8 0 kstatmem 264 798 0 776 2 0 2 2 0 8 0 scxspl 216 229920 0 229919 59 58 1 8 1 8 0 plimitpl 152 4768 0 4741 2 0 2 2 0 8 0 sigapl 424 16830 0 16768 16 8 8 9 0 8 0 futexpl 64 173454 0 173454 21 20 1 1 0 8 1 knotepl 120 1253 0 0 17 0 17 17 0 8 0 kqueuepl 216 4966 0 4957 55 52 3 8 0 8 2 pipepl 320 3905 0 3872 43 36 7 10 0 8 3 fdescpl 496 16811 0 16768 18 11 7 8 0 8 0 filepl 152 114886 0 114604 102 81 21 24 0 8 6 lockfpl 104 4530 0 4527 5 4 1 2 0 8 0 lockfspl 48 1286 0 1283 1 0 1 1 0 8 0 sessionpl 144 442 0 424 1 0 1 1 0 8 0 pgrppl 48 1182 0 1156 1 0 1 1 0 8 0 ucredpl 104 21810 0 21791 1 0 1 1 0 8 0 zombiepl 144 16769 0 16768 1 0 1 1 0 8 0 processpl 1160 16830 0 16768 8 2 6 6 0 8 0 procpl 648 35924 0 35857 14 6 8 8 0 8 0 srpgc 96 26 0 26 12 12 0 1 0 8 0 sosppl 168 200 0 200 24 23 1 1 0 8 1 sockpl 664 39293 0 39256 266 257 9 21 0 8 4 mcl64k 65536 29 0 0 4 1 3 3 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 6 0 0 1 0 1 1 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 554 0 0 29 7 22 29 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 5403 0 0 296 0 296 296 0 8 0 bufpl 280 30908 0 21086 703 1 702 702 0 8 0 anonpl 24 2101460 0 2094880 315 248 67 111 0 185 5 amapchunkpl 152 458333 0 457571 187 141 46 50 0 158 12 amappl16 200 46300 0 46256 403 385 18 28 0 8 9 amappl15 192 11 0 11 4 4 0 1 0 8 0 amappl14 184 952 0 940 1 0 1 1 0 8 0 amappl13 176 12 0 12 4 4 0 1 0 8 0 amappl12 168 23688 0 23645 7 4 3 3 0 8 0 amappl11 160 51 0 40 1 0 1 1 0 8 0 amappl10 152 10 0 9 2 1 1 1 0 8 0 amappl9 144 143 0 142 1 0 1 1 0 8 0 amappl8 136 21 0 19 1 0 1 1 0 8 0 amappl7 128 967 0 954 1 0 1 1 0 8 0 amappl6 120 3993 0 3989 1 0 1 1 0 8 0 amappl5 112 1713 0 1703 1 0 1 1 0 8 0 amappl4 104 1622 0 1603 1 0 1 1 0 8 0 amappl3 96 78962 0 78846 5 1 4 4 0 8 0 amappl2 88 18139 0 18050 3 0 3 3 0 8 0 amappl1 80 93019 0 92407 21 5 16 17 0 8 1 amappl 88 135112 0 134890 9 2 7 7 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 72 144 0 14 3 0 3 3 0 8 0 uaddrrnd 24 16811 0 16768 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 16811 0 16768 1 0 1 1 0 8 0 vmmpekpl 168 142901 0 142841 8 4 4 5 0 8 0 vmmpepl 168 1019416 0 1017144 314 197 117 127 0 357 4 vmsppl 440 16810 0 16768 13 7 6 7 0 8 0 rwobjpl 56 273109 0 262132 206 46 160 163 0 8 0 pdppl 4096 33629 0 33536 1135 1038 97 125 0 8 4 pvpl 32 48626 0 0 385 1 384 384 0 265 0 pmappl 248 16810 0 16768 9 5 4 4 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2399 0 1566 24 0 24 24 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff834e9ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:158 __mp_lock(ffffffff83543b20) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83543b20) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 intr_handler(ffff80002f35ea40,ffff80000006bc00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x6ff98c4509e0, count: 8 ddb{0}> trace x86_ipi_db(ffffffff834e9ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:589 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:158 __mp_lock(ffffffff83543b20) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83543b20) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 intr_handler(ffff80002f35ea40,ffff80000006bc00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x6ff98c4509e0, count: -7 ddb{0}> machine ddbcpu 1 Stopped at fifo_write+0x6e: movq 0x8(%rax),%r15 fifo_write(ffff80002a0d0200) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd8074b462e0,ffff80002a0d0298,8,fffffd807f7d35b0) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8074b462e0,ffff80002a041000,104,0,1,89a0afaed7d6bf6,ffff80002a0d03c0,fffffd8074b462e0,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff80002a0d03c0) at ufs_symlink+0x1ee sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd805d4df8a0,ffff80002a0d0540,ffff80002a0d0570,ffff80002a0d0470,ffff80002a041000) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff800030996558,20000e80,6,20000d80) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff80002a0d06f0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a0d06f0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x37684aa7f80, count: 7 ddb{1}> trace fifo_write(ffff80002a0d0200) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd8074b462e0,ffff80002a0d0298,8,fffffd807f7d35b0) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8074b462e0,ffff80002a041000,104,0,1,89a0afaed7d6bf6,ffff80002a0d03c0,fffffd8074b462e0,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff80002a0d03c0) at ufs_symlink+0x1ee sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd805d4df8a0,ffff80002a0d0540,ffff80002a0d0570,ffff80002a0d0470,ffff80002a041000) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff800030996558,20000e80,6,20000d80) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff80002a0d06f0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a0d06f0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x37684aa7f80, count: -8