panic: ffs2_balloc: unwind failed Starting stack trace... panic(ffffffff83446d5e) at panic+0x1d0 sys/kern/subr_prf.c:229 ffs2_balloc(fffff9006c870270,6001000003,1,fffff900097fd7b8,1,ffff80003c3bae30) at ffs2_balloc+0x1961 ffs_truncate(fffff9006c870270,6001000004,0,fffff900097fd7b8) at ffs_truncate+0x4f8 sys/ufs/ffs/ffs_inode.c:217 ufs_setattr(ffff80003c3baf50) at ufs_setattr+0x8e9 sys/ufs/ufs/ufs_vnops.c:403 VOP_SETATTR(fffff9006036feb8,ffff80003c3bafd8,fffff900097fd7b8,ffff80003c3b54e8) at VOP_SETATTR+0x11b sys/kern/vfs_vops.c:210 dotruncate(ffff80003c3b54e8,fffff9006036feb8,6001000004) at dotruncate+0x1da sys/kern/vfs_syscalls.c:2811 sys_truncate(ffff80003c3b54e8,ffff80003c3bb2b0,ffff80003c3bb200) at sys_truncate+0x13e sys/kern/vfs_syscalls.c:2835 syscall(ffff80003c3bb2b0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3bb2b0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x33b1737e30, count: 248 End of stack trace. syncing disks... done WARNING: SPL NOT LOWERED ON SYSCALL 91 285979368 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *223346 41669 0 0 0 1 syz-executor 308053 21091 0 0x14000 0x200 0 reaper savectx() at savectx+0xae end of kernel end trace frame: 0x77da110bb2d0, count: 14 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}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: ffs2_balloc: unwind failed ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x77da110bb2d0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a220b70 rbx 0 rdx 0 rcx 0xffff80003c3b4fb8 rax 0x3a r8 0xffff80002a220aa0 r9 0x1 r10 0x2496626c04fc2d30 r11 0xea5b6e1de6d41180 r12 0 r13 0 r14 0xffff80003c3b4fb8 r15 0 rip 0xffffffff8322f3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a220af0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=223346 pid=41669 tcnt=3 stat=onproc flags process=0 proc=0 runpri=32, usrpri=77, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c3b5250,0xffff80003c3b4d30 process=0xffff80003c3d3040 user=0xffff80002a21b000, vmspace=0xfffff9006f38db78 estcpu=27, cpticks=1, pctcpu=0.1, user=1, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 32400 65927 52696 0 2 0 syz-executor 78003 475200 71330 0 2 0 syz-executor 78003 210840 71330 0 3 0x4000080 fsleep syz-executor 79715 472123 44693 0 2 0 syz-executor 79715 516000 44693 0 3 0x4000000 sbar syz-executor 79715 512077 44693 0 3 0x4000080 fsleep syz-executor 86877 442399 61225 0 2 0 syz-executor 86877 307531 61225 0 3 0x4000080 ttyout syz-executor 41312 43114 5957 0 3 0x81 nanoslp syz-executor 41312 230070 5957 0 3 0x4000081 ttyin syz-executor 41312 395061 5957 0 3 0x4000081 fsleep syz-executor 41312 419703 5957 0 3 0x4000081 fsleep syz-executor *41669 223346 65754 0 7 0 syz-executor 41669 122605 65754 0 3 0x4000080 sbwait syz-executor 41669 503441 65754 0 3 0x4000080 fsleep syz-executor 20195 278204 91651 0 2 0 syz-executor 20195 194364 91651 0 2 0x4000000 syz-executor 20195 141362 91651 0 3 0x4000080 fsleep syz-executor 3428 200940 1 0 3 0x82 nanoslp getty 65754 508317 21610 0 2 0xc82 syz-executor 35443 206727 21610 0 3 0x82 nanoslp syz-executor 71330 143955 21610 0 2 0xc82 syz-executor 5957 286963 21610 0 2 0xc82 syz-executor 61225 278129 21610 0 3 0x82 nanoslp syz-executor 52696 133624 21610 0 3 0x82 nanoslp syz-executor 44693 470550 21610 0 3 0x82 nanoslp syz-executor 91651 71416 21610 0 2 0xc82 syz-executor 21610 218802 1 0 3 0x82 kqread syz-executor 50610 96618 62868 74 3 0x1100092 bpf pflogd 62868 90418 1 0 3 0x80 sbwait pflogd 12137 445543 1 73 3 0x1100090 kqread syslogd 68752 319971 0 0 3 0x14200 bored smr 40392 241157 0 0 2 0x14200 zerothread 77720 200430 0 0 3 0x14200 aiodoned aiodoned 86795 443917 0 0 3 0x14200 syncer update 45814 11600 0 0 3 0x14200 cleaner cleaner 21091 308053 0 0 7 0x14200 reaper 25481 78207 0 0 3 0x14200 pgdaemon pagedaemon 9369 101479 0 0 3 0x14200 bored viomb 21786 340128 0 0 3 0x40014200 acpi0 acpi0 36050 36300 0 0 3 0x40014200 idle1 74072 119035 0 0 3 0x14200 bored softnet1 78152 436952 0 0 2 0x14200 softnet0 99673 60560 0 0 2 0x40014200 systqmp 4036 357997 0 0 3 0x14200 bored systq 5377 296129 0 0 3 0x14200 tmoslp softclockmp 36628 278586 0 0 3 0x40014200 tmoslp softclock 19280 257166 0 0 3 0x40014200 idle0 1 139183 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 79715 (syz-executor) thread 0xffff80003c3b54e8 (516000) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a80780) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 sleep_finish+0x2d8 sys/kern/kern_synch.c:369 #3 biowait+0xc6 sys/kern/vfs_bio.c:1110 #4 bwrite+0x359 sys/kern/vfs_bio.c:625 #5 ffs2_balloc+0xc24 sys/ufs/ffs/ffs_balloc.c:646 #6 ffs_truncate+0x4f8 sys/ufs/ffs/ffs_inode.c:217 #7 ufs_setattr+0x8e9 sys/ufs/ufs/ufs_vnops.c:403 #8 VOP_SETATTR+0x11b sys/kern/vfs_vops.c:210 #9 dotruncate+0x1da sys/kern/vfs_syscalls.c:2811 #10 sys_truncate+0x13e sys/kern/vfs_syscalls.c:2835 #11 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #12 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffff9006c870310) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 sys_truncate+0xce sys/kern/vfs_syscalls.c:2834 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #7 Xsyscall+0x128 Process 20195 (syz-executor) thread 0xffff80003c3b5250 (194364) shared rwlock vmmaplk r = 0 (0xfffff9006f38de60) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvm_vslock_device+0x149 sys/uvm/uvm_glue.c:173 #3 physio+0x257 sys/kern/kern_physio.c:139 #4 spec_write+0x11f sys/kern/spec_vnops.c:302 #5 VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 #6 vn_write+0x1d3 sys/kern/vfs_vnops.c:414 #7 dofilewritev+0x2bd sys/kern/sys_generic.c:384 #8 sys_write+0xa2 sys/kern/sys_generic.c:300 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #10 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11053 12081K 12290K 166960K 12237 0 pcb 17 12K 12K 166960K 29 0 rtable 241 7K 8K 166960K 365 0 pf 35 17K 24K 166960K 76 0 ifaddr 43 7K 7K 166960K 52 0 ifgroup 55 2K 2K 166960K 68 0 sysctl 3 1K 9K 166960K 7 0 counters 70 37K 37K 166960K 84 0 ioctlops 0 0K 4K 166960K 1504 0 iov 0 0K 12K 166960K 36 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1298 82K 82K 166960K 1433 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 4 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 226 0 proc 31 50K 180K 166960K 570 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 0 0K 0K 166960K 6 0 in_multi 99 7K 7K 166960K 101 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 396 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 170 92K 169K 166960K 3993 0 UVM aobj 10 4K 4K 166960K 12 0 pinsyscall 25 50K 102K 166960K 1416 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 5 0 NDP 12 0K 2K 166960K 33 0 temp 40 9114K 9122K 166960K 7431 0 kqueue 3 4K 24K 166960K 37 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 44 0 43 1 0 1 1 0 8 0 rtentry 176 111 0 1 5 0 5 5 0 8 0 unpcb 144 138 0 130 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 27 0 26 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 123 0 122 1 0 1 1 0 8 0 nd6 152 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 6 0 6 1 0 1 1 0 8 1 pfstscr 40 4 0 2 1 0 1 1 0 8 0 pffrag 232 1 0 1 1 0 1 1 0 482 1 pffrnode 88 1 0 1 1 0 1 1 0 8 1 pffrent 40 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 pfsrclim 320 2 0 2 1 0 1 1 0 8 1 pfanchor 1288 9 0 9 1 0 1 1 0 8 1 pfstitem 24 28 0 2 1 0 1 1 0 8 0 pfstkey 128 28 0 2 1 0 1 1 0 8 0 pfstate 448 26 0 1 3 0 3 3 0 8 0 pfrule 1360 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 452 0 0 29 0 29 29 0 8 0 art_table 40 453 0 0 5 0 5 5 0 8 0 art_node 32 111 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semapl 72 2 0 0 1 0 1 1 0 8 0 shmpl 112 9 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1728 0 256 93 0 93 93 0 8 0 ffsino 296 1728 0 256 114 0 114 114 0 8 0 nchpl 144 2057 0 350 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 1859 0 0 104 0 104 104 0 8 0 namei 1024 6509 0 6509 2 0 2 2 0 8 2 percpumem 16 57 0 7 1 0 1 1 0 8 0 kstatmem 264 37 0 10 3 0 3 3 0 8 1 scxspl 216 7174 0 7174 4 2 2 3 1 8 2 plimitpl 152 40 0 25 1 0 1 1 0 8 0 sigapl 424 553 0 514 7 0 7 7 0 8 1 knotepl 120 283 0 0 9 0 9 9 0 8 0 kqueuepl 224 48 0 46 1 0 1 1 0 8 0 pipepl 344 134 0 106 3 0 3 3 0 8 0 fdescpl 528 537 0 515 3 0 3 3 0 8 0 filepl 160 2204 0 2005 10 0 10 10 0 8 1 lockfpl 104 60 0 57 1 0 1 1 0 8 0 lockfspl 48 27 0 24 1 0 1 1 0 8 0 sessionpl 144 27 0 22 1 0 1 1 0 8 0 pgrppl 48 35 0 22 1 0 1 1 0 8 0 ucredpl 104 222 0 215 1 0 1 1 0 8 0 zombiepl 144 515 0 514 1 0 1 1 0 8 0 processpl 1232 553 0 514 5 0 5 5 0 8 0 procpl 664 704 0 654 6 0 6 6 0 8 1 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 752 309 0 299 4 0 4 4 0 8 2 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 122 0 0 16 0 16 16 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 155 0 0 10 0 10 10 0 8 0 bufpl 272 2560 0 105 164 0 164 164 0 8 0 anonpl 32 5486 0 0 45 0 45 45 0 246 0 amapchunkpl 152 11035 0 10621 27 0 27 27 0 158 9 amappl16 200 1136 0 981 10 1 9 9 0 8 0 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 453 0 453 1 0 1 1 0 8 1 amappl13 176 164 0 160 1 0 1 1 0 8 0 amappl12 168 799 0 779 2 0 2 2 0 8 0 amappl11 160 41 0 40 1 0 1 1 0 8 0 amappl10 152 66 0 60 1 0 1 1 0 8 0 amappl9 144 286 0 286 1 1 0 1 0 8 0 amappl8 136 99 0 98 1 0 1 1 0 8 0 amappl7 128 164 0 158 1 0 1 1 0 8 0 amappl6 120 156 0 156 1 0 1 1 0 8 1 amappl5 112 99 0 95 1 0 1 1 0 8 0 amappl4 104 294 0 284 1 0 1 1 0 8 0 amappl3 96 2087 0 2002 4 0 4 4 0 8 1 amappl2 88 558 0 536 2 0 2 2 0 8 0 amappl1 80 11054 0 10845 15 0 15 15 0 8 4 amappl 88 3221 0 3082 5 0 5 5 0 92 1 uvmvnodes 80 102 0 0 3 0 3 3 0 8 0 dma65536 65536 1 0 1 1 0 1 1 0 8 1 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 11 0 2 1 0 1 1 0 8 0 uaddrrnd 24 537 0 515 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 537 0 515 1 0 1 1 0 8 0 vmmpekpl 168 6392 0 6355 2 0 2 2 0 8 0 vmmpepl 168 43255 0 42053 86 0 86 86 0 357 25 vmsppl 488 536 0 515 5 0 5 5 0 8 2 rwobjpl 80 15084 0 14380 23 0 23 23 0 8 0 pdppl 4096 1081 0 1030 99 28 71 83 0 8 20 pvpl 32 13020 0 0 106 1 105 106 0 265 0 pmappl 256 536 0 515 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 437 0 31 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff839baff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 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(ffffffff83a7ff80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a7ff80) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80002a1f4180,ffff800000079600) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff83a7ff80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a7ff80) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff83a7ff80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a7ff80) at __mp_lock+0x192 sys/kern/kern_lock.c:173 reaper(ffff8000ffffdc90) at reaper+0x211 sys/kern/kern_exit.c:505 end trace frame: 0x0, count: 3 ddb{0}> trace x86_ipi_db(ffffffff839baff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 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(ffffffff83a7ff80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a7ff80) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80002a1f4180,ffff800000079600) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff83a7ff80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a7ff80) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff83a7ff80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a7ff80) at __mp_lock+0x192 sys/kern/kern_lock.c:173 reaper(ffff8000ffffdc90) at reaper+0x211 sys/kern/kern_exit.c:505 end trace frame: 0x0, count: -12 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x77da110bb2d0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x77da110bb2d0, count: -1 ddb{1}>