6kernel:I Tp 0g ea faStopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 278680 84806 0 0x10 0x4000000 1K syz-executor *321288 92537 0 0 0 0 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x7a6ec9bdfe20, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu1: uvm_fault(0xfffff8006c4bc7c0, 0x98, 0, 1) -> e ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7a6ec9bdfe20, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a2298f0 rbx 0 rdx 0 rcx 0xffff80002a223a00 rax 0x3c r8 0xffff80002a229820 r9 0 r10 0x54448af98b96475d r11 0x75349fd2a7862f11 r12 0 r13 0 r14 0xffff80002a223a00 r15 0 rip 0xffffffff8306a3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a229870 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{0}> show proc PROC (syz-executor) tid=321288 pid=92537 tcnt=4 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c3d6558,0xffff80003c3d6d30 process=0xffff8000ffff0e80 user=0xffff80002a224000, vmspace=0xfffff8000b063988 estcpu=36, cpticks=6, pctcpu=0.0, user=3, sys=3, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 43288 186303 6809 0 2 0 syz-executor 43288 228523 6809 0 3 0x4000080 fsleep syz-executor 43288 9107 6809 0 3 0x4000080 fsleep syz-executor 84806 231198 30297 0 2 0x10 syz-executor 84806 278680 30297 0 7 0x4000010 syz-executor 31915 400694 89316 -1 2 0x10 syz-executor 31915 513204 89316 -1 3 0x4000090 fsleep syz-executor 31915 257027 89316 -1 3 0x4000090 fsleep syz-executor 31915 104052 89316 -1 2 0x4000010 syz-executor 60055 36252 10415 0 3 0x80 nanoslp syz-executor 60055 353672 10415 0 3 0x4000080 sbwait syz-executor 60055 395913 10415 0 3 0x4000080 fsleep syz-executor *92537 321288 80642 0 7 0 syz-executor 92537 386046 80642 0 3 0x4000080 ttyout syz-executor 92537 481802 80642 0 3 0x4000080 fsleep syz-executor 92537 491673 80642 0 3 0x4000080 fsleep syz-executor 97224 103561 1 0 3 0x100083 ttyopn getty 89316 94074 54241 0 3 0x82 nanoslp syz-executor 29388 289552 54241 0 3 0x2 biowait syz-executor 5854 36743 54241 0 3 0x2 biowait syz-executor 30297 31015 54241 0 3 0x82 nanoslp syz-executor 92499 21220 54241 0 3 0x2 biowait syz-executor 80642 515742 54241 0 3 0x82 nanoslp syz-executor 6809 263907 54241 0 3 0x82 nanoslp syz-executor 10415 449739 54241 0 3 0x82 nanoslp syz-executor 54241 463976 1 0 3 0x82 kqread syz-executor 87406 312711 0 0 3 0x14200 bored smr 97580 381603 0 0 2 0x14200 zerothread 49309 149309 0 0 3 0x14200 aiodoned aiodoned 40010 177781 0 0 3 0x14200 syncer update 15158 120981 0 0 3 0x14200 cleaner cleaner 70962 180868 0 0 3 0x14200 reaper reaper 64637 446944 0 0 3 0x14200 pgdaemon pagedaemon 10648 453177 0 0 3 0x14200 bored viomb 62611 348285 0 0 3 0x40014200 acpi0 acpi0 18933 206065 0 0 3 0x40014200 idle1 28571 122770 0 0 3 0x14200 bored softnet1 32302 144830 0 0 3 0x14200 bored softnet0 2083 391825 0 0 3 0x14200 bored systqmp 31974 189400 0 0 3 0x14200 bored systq 5552 272 0 0 3 0x14200 tmoslp softclockmp 46607 285947 0 0 3 0x40014200 tmoslp softclock 94949 508360 0 0 3 0x40014200 idle0 1 311322 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 84806 (syz-executor) thread 0xffff8000fffee548 (278680) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a3c2c0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 Process 29388 (syz-executor) thread 0xffff8000fffef240 (289552) exclusive rrwlock inode r = 0 (0xfffff8006c6748e0) #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 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580 #11 namei+0x7c5 sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1806 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffff8006ee61368) #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 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x16bd sys/ufs/ufs/ufs_lookup.c:573 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580 #11 namei+0x7c5 sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1806 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #14 Xsyscall+0x128 Process 5854 (syz-executor) thread 0xffff8000fffef770 (36743) exclusive rrwlock inode r = 0 (0xfffff8006c6747b8) #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 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3062 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffff8006cdbd7a8) #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 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431 #6 namei+0x7c5 sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3047 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 Process 92499 (syz-executor) thread 0xffff80002a222010 (21220) exclusive rrwlock inode r = 0 (0xfffff8006c674d80) #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 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580 #11 namei+0x7c5 sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1806 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffff8006cdbd430) #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 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431 #6 namei+0x7c5 sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1806 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11064 12221K 12352K 166960K 12403 0 pcb 18 12K 12K 166960K 66 0 rtable 242 8K 8K 166960K 374 0 pf 40 19K 22K 166960K 111 0 ifaddr 43 7K 7K 166960K 52 0 ifgroup 55 2K 2K 166960K 70 0 sysctl 4 1K 9K 166960K 11 0 counters 70 37K 37K 166960K 80 0 ioctlops 0 0K 4K 166960K 1520 0 iov 0 0K 16K 166960K 6 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1291 81K 82K 166960K 1637 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 9 0K 0K 166960K 18 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 14 53K 93K 166960K 332 0 sigio 0 0K 0K 166960K 3 0 proc 21 33K 180K 166960K 579 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 19 0 in_multi 99 7K 7K 166960K 102 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 10 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 398 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 130 82K 170K 166960K 4832 0 UVM aobj 9 2K 2K 166960K 9 0 pinsyscall 17 34K 104K 166960K 1502 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 1K 166960K 33 0 temp 41 9115K 9154K 166960K 10982 0 kqueue 1 2K 24K 166960K 51 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 41 0 41 1 0 1 1 0 8 1 rtentry 176 113 0 3 6 0 6 6 0 8 1 unpcb 144 130 0 128 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 40 0 39 2 0 2 2 0 8 1 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 221 0 219 2 0 2 2 0 8 1 nd6 152 25 0 1 1 0 1 1 0 8 0 pkpcb 40 65 0 65 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 3 0 3 1 0 1 1 0 8 1 pfstscr 40 6 0 2 1 0 1 1 0 8 0 pffrag 232 3 0 0 1 0 1 1 0 482 0 pffrnode 88 3 0 0 1 0 1 1 0 8 0 pffrent 40 8 0 4 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfrktable 1344 7 0 5 1 0 1 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pfstitem 24 36 0 0 1 0 1 1 0 8 0 pfstkey 128 38 0 2 2 0 2 2 0 8 0 pfstate 448 35 0 1 4 0 4 4 0 8 0 pfrule 1360 31 0 18 3 1 2 2 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 496 0 45 31 0 31 31 0 8 2 art_table 40 497 0 45 5 0 5 5 0 8 0 art_node 32 113 0 13 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 1 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 72 14 0 7 1 0 1 1 0 8 0 shmpl 112 6 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2026 0 554 93 0 93 93 0 8 0 ffsino 296 2026 0 554 115 0 115 115 0 8 1 nchpl 144 2466 0 757 64 0 64 64 0 8 0 vnodes 216 2215 0 0 124 0 124 124 0 8 0 namei 1024 7958 0 7957 3 0 3 3 0 8 2 percpumem 16 55 0 5 1 0 1 1 0 8 0 pfiaddrpl 120 8 0 0 1 0 1 1 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 kstatmem 264 37 0 10 3 0 3 3 0 8 1 scsiplug 72 3 0 3 1 0 1 1 0 8 1 scxspl 216 9942 0 9939 4 3 1 3 1 8 0 plimitpl 152 185 0 175 1 0 1 1 0 8 0 sigapl 424 653 0 620 7 1 6 7 0 8 0 knotepl 120 278 0 0 9 0 9 9 0 8 0 kqueuepl 224 60 0 59 1 0 1 1 0 8 0 pipepl 344 134 0 107 3 0 3 3 0 8 0 fdescpl 528 637 0 620 3 0 3 3 0 8 0 filepl 160 3120 0 2952 13 0 13 13 0 8 3 lockfpl 104 134 0 129 1 0 1 1 0 8 0 lockfspl 48 67 0 62 1 0 1 1 0 8 0 sessionpl 144 94 0 91 1 0 1 1 0 8 0 pgrppl 48 102 0 91 1 0 1 1 0 8 0 ucredpl 104 718 0 712 1 0 1 1 0 8 0 zombiepl 144 620 0 620 1 0 1 1 0 8 1 processpl 1232 653 0 620 5 1 4 5 0 8 0 procpl 664 962 0 918 6 0 6 6 0 8 1 sockpl 752 462 0 458 8 0 8 8 0 8 7 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl9k128 9344 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 126 0 0 16 0 16 16 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 20 0 0 3 0 3 3 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 154 0 0 10 0 10 10 0 8 0 bufpl 272 5833 0 105 382 0 382 382 0 8 0 anonpl 32 5694 0 0 46 0 46 46 0 246 0 amapchunkpl 152 14615 0 14267 23 0 23 23 0 158 8 amappl16 200 1953 0 1918 17 3 14 14 0 8 12 amappl15 192 24 0 24 2 2 0 1 0 8 0 amappl14 184 436 0 436 1 0 1 1 0 8 1 amappl13 176 126 0 125 1 0 1 1 0 8 0 amappl12 168 887 0 871 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 91 0 91 1 0 1 1 0 8 1 amappl9 144 277 0 277 1 1 0 1 0 8 0 amappl8 136 99 0 99 1 0 1 1 0 8 1 amappl7 128 149 0 147 1 0 1 1 0 8 0 amappl6 120 190 0 190 1 0 1 1 0 8 1 amappl5 112 191 0 190 1 0 1 1 0 8 0 amappl4 104 295 0 292 1 0 1 1 0 8 0 amappl3 96 2788 0 2710 3 0 3 3 0 8 0 amappl2 88 543 0 535 2 0 2 2 0 8 0 amappl1 80 11415 0 11301 14 0 14 14 0 8 7 amappl 88 4004 0 3889 4 0 4 4 0 92 0 uvmvnodes 80 108 0 0 3 0 3 3 0 8 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 128 255 0 255 2 1 1 1 0 8 1 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 8 0 0 1 0 1 1 0 8 0 uaddrrnd 24 637 0 620 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 637 0 620 1 0 1 1 0 8 0 vmmpekpl 168 7022 0 6987 2 0 2 2 0 8 0 vmmpepl 168 49308 0 48533 86 0 86 86 0 357 45 vmsppl 488 636 0 620 5 0 5 5 0 8 1 rwobjpl 80 16739 0 16287 24 1 23 24 0 8 2 pdppl 4096 1281 0 1240 101 54 47 85 0 8 6 pvpl 32 10377 0 0 84 0 84 84 0 265 0 pmappl 256 636 0 620 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 662 0 57 18 0 18 18 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}>