uvm_fault(0xfffffd806bcecc10, 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 *126097 52340 0 0 0x4000000 1K syz-executor 381649 13166 0 0 0 0 syz-executor fifo_write(ffff8000347a0210) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd8065d80dd0,ffff8000347a02a8,8,fffffd807f7d3548) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8065d80dd0,ffff80002a05d000,103,0,1,51e385b364982c17,ffff8000347a03d0,fffffd8065d80dd0,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff8000347a03d0) at ufs_symlink+0x1ee sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd8065d80488,ffff8000347a0550,ffff8000347a0580,ffff8000347a0480,ffff80002a05d000) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff8000ffff0538,20001640,ffffff9c,20000e40) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff8000347a0700) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000347a0700) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8d10d280300, 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(0xfffffd806bcecc10, 0x8, 0, 1) -> e ddb{1}> trace fifo_write(ffff8000347a0210) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd8065d80dd0,ffff8000347a02a8,8,fffffd807f7d3548) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8065d80dd0,ffff80002a05d000,103,0,1,51e385b364982c17,ffff8000347a03d0,fffffd8065d80dd0,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff8000347a03d0) at ufs_symlink+0x1ee sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd8065d80488,ffff8000347a0550,ffff8000347a0580,ffff8000347a0480,ffff80002a05d000) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff8000ffff0538,20001640,ffffff9c,20000e40) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff8000347a0700) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000347a0700) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8d10d280300, count: -8 ddb{1}> show registers rdi 0xfffffd8065d80dd0 rsi 0x1b56 __ALIGN_SIZE+0xb56 rbp 0xffff8000347a0200 rbx 0xfffffd8065d80dd0 rdx 0xffff80002a371000 rcx 0x1b55 __ALIGN_SIZE+0xb55 rax 0 r8 0 r9 0x1 r10 0xffff800029b7bff0 r11 0xe342c5e49966a0ce r12 0x4000 __ALIGN_SIZE+0x3000 r13 0xffff8000347a02a8 r14 0xffff8000347a0210 r15 0x1 rip 0xffffffff82aa47be fifo_write+0x6e cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000347a01d0 ss 0 fifo_write+0x6e: movq 0x8(%rax),%r15 ddb{1}> show proc PROC (syz-executor) tid=126097 pid=52340 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=17, usrpri=63, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff1978,0xffff8000ffff0a58 process=0xffff8000ffff7b00 user=0xffff80003479b000, vmspace=0xfffffd806bcecc10 estcpu=13, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 91746 430074 54773 0 2 0 syz-executor 91746 157861 54773 0 3 0x4000080 fsleep syz-executor 91746 349534 54773 0 3 0x4000080 fsleep syz-executor 11569 143072 27118 60928 2 0x10 syz-executor 11569 76116 27118 60928 3 0x4000090 fsleep syz-executor 52340 170599 14380 0 2 0 syz-executor *52340 126097 14380 0 7 0x4000000 syz-executor 13166 381649 40917 0 7 0 syz-executor 13166 102656 40917 0 3 0x4000080 bell syz-executor 13166 387965 40917 0 2 0x4000000 syz-executor 55246 69739 83618 0 3 0x82 wait syz-executor 40917 114587 83618 0 2 0x482 syz-executor 10640 91290 83618 0 3 0x82 wait syz-executor 53861 351174 83618 0 3 0x2 biowait syz-executor 20808 94249 83618 0 3 0x82 nanoslp syz-executor 27118 145977 83618 0 2 0x482 syz-executor 14380 451416 83618 0 2 0x482 syz-executor 54773 117147 83618 0 2 0x482 syz-executor 83618 486000 76908 0 3 0x82 kqread syz-executor 76908 321307 50002 0 3 0x10008a sigsusp ksh 50002 461566 64687 0 3 0x98 kqread sshd-session 64687 425828 46790 0 3 0x92 kqread sshd-session 67000 431934 1 0 3 0x100083 ttyin getty 46790 270399 1 0 3 0x88 kqread sshd 88004 386374 16010 74 3 0x1100092 bpf pflogd 16010 385777 1 0 3 0x80 sbwait pflogd 72251 155782 18297 73 3 0x1100010 ffs_fsync syslogd 18297 21036 1 0 3 0x100082 sbwait syslogd 2814 233720 1 0 3 0x100080 kqread resolvd 68066 509192 1216 77 3 0x100092 kqread dhcpleased 31555 465580 1216 77 3 0x100092 kqread dhcpleased 1216 172620 1 0 3 0x80 kqread dhcpleased 18295 64631 0 0 3 0x14200 bored smr 91933 469601 0 0 2 0x14200 zerothread 61275 513155 0 0 3 0x14200 aiodoned aiodoned 9144 459608 0 0 3 0x14200 syncer update 59260 476447 0 0 3 0x14200 cleaner cleaner 38600 520043 0 0 2 0x14200 reaper 19548 343598 0 0 3 0x14200 pgdaemon pagedaemon 87494 19099 0 0 3 0x14200 bored viomb 61120 492655 0 0 3 0x40014200 acpi0 acpi0 60354 186548 0 0 3 0x40014200 idle1 37581 231239 0 0 3 0x14200 bored softnet3 40481 381178 0 0 3 0x14200 bored softnet2 30593 56872 0 0 3 0x14200 bored softnet1 38016 367304 0 0 3 0x14200 bored softnet0 48472 356502 0 0 3 0x14200 bored systqmp 66629 125345 0 0 3 0x14200 bored systq 71008 451735 0 0 3 0x14200 tmoslp softclockmp 23353 401340 0 0 3 0x40014200 tmoslp softclock 83459 209681 0 0 3 0x40014200 idle0 1 440839 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 52340 (syz-executor) thread 0xffff8000ffff0538 (126097) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff835f9448) #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 (0xfffffd807e36fa30) #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 53861 (syz-executor) thread 0xffff80002a04d6e0 (351174) exclusive rrwlock inode r = 0 (0xfffffd806de1f708) #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 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:120 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0x113 sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x102 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3100 #10 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #10 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c572d58) #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 domkdirat+0x8b sys/kern/vfs_syscalls.c:3085 #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 Process 72251 (syslogd) thread 0xffff8000ffffdbe8 (155782) exclusive rrwlock inode r = 0 (0xfffffd806e4a33d0) #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 sys_fsync+0x152 sys/kern/vfs_syscalls.c:2927 #6 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #6 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 38600 (reaper) thread 0xffff800029fd91c0 (520043) exclusive rwlock vmmaplk r = 0 (0xfffffd806bcec468) #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 vm_map_lock_ln+0x143 sys/uvm/uvm_map.c:5252 #3 uvm_map_teardown+0x5e sys/uvm/uvm_map.c:2466 #4 uvmspace_free+0xcd sys/uvm/uvm_map.c:3422 #5 reaper+0x246 sys/kern/kern_exit.c:481 #6 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10191 10102K 10225K 166960K 11309 0 pcb 17 12K 12K 166960K 31 0 rtable 210 5K 6K 166960K 348 0 pf 34 17K 18K 166960K 50 0 ifaddr 40 6K 7K 166960K 47 0 ifgroup 55 2K 2K 166960K 59 0 counters 64 36K 36K 166960K 68 0 ioctlops 0 0K 4K 166960K 1548 0 iov 0 0K 8K 166960K 5 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1372 86K 87K 166960K 1482 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 14 49K 89K 166960K 182 0 proc 69 91K 128K 166960K 528 0 subproc 104 6K 6K 166960K 104 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 9 0 in_multi 85 6K 7K 166960K 104 0 ether_multi 1 0K 0K 166960K 2 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 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 365 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 249 77K 87K 166960K 3177 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 39 78K 103K 166960K 1251 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 2 0 NDP 12 0K 2K 166960K 30 0 temp 37 6814K 6880K 166960K 4231 0 kqueue 13 20K 24K 166960K 25 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 34 0 31 1 0 1 1 0 8 0 rtentry 112 111 0 13 4 0 4 4 0 8 0 unpcb 144 333 0 315 6 0 6 6 0 8 5 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 808 18 0 14 1 0 1 1 0 8 0 arp 120 18 0 0 1 0 1 1 0 8 0 inpcb 336 112 0 104 2 0 2 2 0 8 0 nd6 136 24 0 5 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 2 0 2 1 0 1 1 0 8 1 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 20 0 0 1 0 1 1 0 8 0 pfstkey 128 20 0 0 1 0 1 1 0 8 0 pfstate 376 20 0 0 2 0 2 2 0 8 0 pfrule 1344 21 0 15 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 453 0 56 29 0 29 29 0 8 1 art_table 32 454 0 56 4 0 4 4 0 8 0 art_node 16 110 0 20 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 0 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1696 0 187 95 0 95 95 0 8 0 ffsino 272 1696 0 187 101 0 101 101 0 8 0 nchpl 144 1941 0 259 63 0 63 63 0 8 0 uvmvnodes 80 1835 0 0 38 0 38 38 0 8 0 vnodes 216 1835 0 0 102 0 102 102 0 8 0 namei 1024 6273 0 6271 2 0 2 2 0 8 1 percpumem 16 48 0 2 1 0 1 1 0 8 0 kstatmem 264 28 0 4 2 0 2 2 0 8 0 scxspl 216 5459 0 5457 3 1 2 2 1 8 1 plimitpl 152 134 0 115 1 0 1 1 0 8 0 sigapl 424 480 0 431 7 0 7 7 0 8 1 futexpl 64 816 0 813 1 0 1 1 0 8 0 knotepl 120 301 0 0 10 0 10 10 0 8 0 kqueuepl 216 27 0 18 1 0 1 1 0 8 0 pipepl 320 107 0 80 3 0 3 3 0 8 0 fdescpl 496 462 0 434 5 0 5 5 0 8 1 filepl 152 2245 0 2000 15 0 15 15 0 8 4 lockfpl 104 21 0 18 1 0 1 1 0 8 0 lockfspl 48 11 0 8 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 31 0 14 1 0 1 1 0 8 0 ucredpl 104 323 0 308 1 0 1 1 0 8 0 zombiepl 144 434 0 431 1 0 1 1 0 8 0 processpl 1160 480 0 431 5 0 5 5 0 8 1 procpl 648 567 0 506 6 0 6 6 0 8 0 sockpl 664 481 0 452 14 3 11 14 0 8 8 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 220 0 0 28 0 28 28 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 224 0 0 14 0 14 14 0 8 0 bufpl 280 5062 0 97 355 0 355 355 0 8 0 anonpl 24 141049 0 127998 79 0 79 79 0 185 0 amapchunkpl 152 11013 0 9941 42 0 42 42 0 158 0 amappl16 200 3325 0 3309 10 0 10 10 0 8 8 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 116 0 104 1 0 1 1 0 8 0 amappl13 176 25 0 25 1 1 0 1 0 8 0 amappl12 168 1101 0 1070 3 1 2 2 0 8 0 amappl11 160 59 0 45 1 0 1 1 0 8 0 amappl10 152 8 0 8 1 1 0 1 0 8 0 amappl9 144 135 0 134 2 1 1 1 0 8 0 amappl8 136 25 0 23 1 0 1 1 0 8 0 amappl7 128 117 0 105 1 0 1 1 0 8 0 amappl6 120 189 0 188 1 0 1 1 0 8 0 amappl5 112 130 0 119 1 0 1 1 0 8 0 amappl4 104 310 0 289 1 0 1 1 0 8 0 amappl3 96 2055 0 1928 4 0 4 4 0 8 0 amappl2 88 614 0 549 2 0 2 2 0 8 0 amappl1 80 7814 0 7228 14 0 14 14 0 8 1 amappl 88 2809 0 2622 5 0 5 5 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 462 0 432 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 462 0 432 1 0 1 1 0 8 0 vmmpekpl 168 5921 0 5887 2 0 2 2 0 8 0 vmmpepl 168 36736 0 34844 92 0 92 92 0 357 8 vmsppl 440 461 0 431 6 1 5 5 0 8 1 rwobjpl 56 16241 0 13446 40 0 40 40 0 8 0 pdppl 4096 931 0 862 101 26 75 85 0 8 6 pvpl 32 43171 0 0 350 1 349 349 0 265 0 pmappl 248 461 0 431 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 384 0 28 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83459ff0) 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 __mp_lock(ffffffff835f9240) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835f9240) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80003378dfe0,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: 0x7a1c39511550, count: 9 ddb{0}> trace x86_ipi_db(ffffffff83459ff0) 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 __mp_lock(ffffffff835f9240) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835f9240) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80003378dfe0,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: 0x7a1c39511550, count: -6 ddb{0}> machine ddbcpu 1 Stopped at fifo_write+0x6e: movq 0x8(%rax),%r15 fifo_write(ffff8000347a0210) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd8065d80dd0,ffff8000347a02a8,8,fffffd807f7d3548) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8065d80dd0,ffff80002a05d000,103,0,1,51e385b364982c17,ffff8000347a03d0,fffffd8065d80dd0,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff8000347a03d0) at ufs_symlink+0x1ee sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd8065d80488,ffff8000347a0550,ffff8000347a0580,ffff8000347a0480,ffff80002a05d000) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff8000ffff0538,20001640,ffffff9c,20000e40) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff8000347a0700) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000347a0700) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8d10d280300, count: 7 ddb{1}> trace fifo_write(ffff8000347a0210) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd8065d80dd0,ffff8000347a02a8,8,fffffd807f7d3548) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8065d80dd0,ffff80002a05d000,103,0,1,51e385b364982c17,ffff8000347a03d0,fffffd8065d80dd0,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff8000347a03d0) at ufs_symlink+0x1ee sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd8065d80488,ffff8000347a0550,ffff8000347a0580,ffff8000347a0480,ffff80002a05d000) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff8000ffff0538,20001640,ffffff9c,20000e40) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff8000347a0700) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000347a0700) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8d10d280300, count: -8