panic: Caught invalid memory access at ffff80003b3267d8 size 4 op 0 Stopped at db_enter+0x17: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND 480708 5690 -1 0x10 0 0 syz-executor *504592 24249 0 0x14000 0x200 1K reaper db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff84635b4e) at panic+0x270 sys/kern/subr_prf.c:198 __asan_load4_noabort(ffff80003b3267d8) at __asan_load4_noabort+0xa3 witness_checkorder(ffff80003b3267b8,9,0) at witness_checkorder+0x111 sys/kern/subr_witness.c:779 mtx_enter(ffff80003b3267a8) at mtx_enter+0x105 sys/kern/kern_lock.c:406 knote_processexit(ffff80003b3266a0) at knote_processexit+0x43 sys/kern/kern_event.c:2236 reaper(ffff800029895760) at reaper+0x38d sys/kern/kern_exit.c:515 end trace frame: 0x0, count: 8 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: Caught invalid memory access at ffff80003b3267d8 size 4 op 0 ddb{1}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff84635b4e) at panic+0x270 sys/kern/subr_prf.c:198 __asan_load4_noabort(ffff80003b3267d8) at __asan_load4_noabort+0xa3 witness_checkorder(ffff80003b3267b8,9,0) at witness_checkorder+0x111 sys/kern/subr_witness.c:779 mtx_enter(ffff80003b3267a8) at mtx_enter+0x105 sys/kern/kern_lock.c:406 knote_processexit(ffff80003b3266a0) at knote_processexit+0x43 sys/kern/kern_event.c:2236 reaper(ffff800029895760) at reaper+0x38d sys/kern/kern_exit.c:515 end trace frame: 0x0, count: -7 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800029893b10 rbx 0xffff800029893b80 rdx 0 rcx 0xffff800028fe3ff0 rax 0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xffff8000298938f8 r11 0xffffffff83f284c0 x86_bus_space_io_read_1 r12 0xffffffff84635b4e .str.23+0x9d50e r13 0xffff800028fe4c08 r14 0xffff800028fe4e07 r15 0x1 rip 0xffffffff818a32b7 db_enter+0x17 cs 0x8 rflags 0x246 rsp 0xffff800029893b10 ss 0x10 db_enter+0x17: popq %rbp ddb{1}> show proc PROC (reaper) tid=504592 pid=24249 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=32, usrpri=53, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800045fff9f0,0xffff8000298954d8 process=0xffff800029802b50 user=0xffff800029888000, vmspace=0xffffffff854c0c80 estcpu=3, cpticks=26, pctcpu=0.2, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 67421 34621 34004 0 2 0x10 syz-executor 67421 314828 34004 0 2 0x4000090 syz-executor 24999 350787 50568 0 2 0 syz-executor 24999 453710 50568 0 3 0x4000080 fsleep syz-executor 51485 200891 67686 0 2 0 syz-executor 51485 437832 67686 0 3 0x4000080 fsleep syz-executor 86202 366188 78698 0 2 0 syz-executor 86202 279335 78698 0 2 0x4000000 syz-executor 5690 480708 36876 -1 7 0x10 syz-executor 5690 151066 36876 -1 3 0x4000090 sbwait syz-executor 5690 145027 36876 -1 3 0x4000090 fsleep syz-executor 5690 311141 36876 -1 2 0x4000010 syz-executor 85432 420990 43789 0 3 0x100082 sbwait arp 43789 111274 66946 0 3 0x10008a sigsusp sh 66946 463573 9686 0 3 0x82 wait syz-executor 34004 417342 9686 0 2 0xc82 syz-executor 36876 348430 9686 0 3 0x82 nanoslp syz-executor 67686 212877 9686 0 3 0x82 nanoslp syz-executor 78698 273228 9686 0 2 0xc82 syz-executor 68026 292550 9686 0 3 0x2 biowait syz-executor 61937 480654 9686 0 3 0x82 wait syz-executor 50568 137388 9686 0 3 0x82 nanoslp syz-executor 9686 456423 90727 0 3 0x82 kqread syz-executor 90727 74928 10643 0 3 0x10008a sigsusp ksh 10643 240582 21529 0 3 0x98 kqread sshd-session 21529 451198 30527 0 3 0x92 kqread sshd-session 88731 355836 1 0 3 0x100083 ttyin getty 30527 151970 1 0 3 0x88 kqread sshd 31795 23979 6151 74 3 0x1100092 bpf pflogd 6151 451517 1 0 3 0x80 sbwait pflogd 43122 319903 24337 73 3 0x1100090 kqread syslogd 24337 396806 1 0 3 0x100082 sbwait syslogd 65924 454029 1 0 3 0x100080 kqread resolvd 91777 187606 75848 77 3 0x100092 kqread dhcpleased 19712 386143 75848 77 3 0x100092 kqread dhcpleased 75848 63974 1 0 3 0x80 kqread dhcpleased 60592 342809 0 0 3 0x14200 bored smr 10797 454492 0 0 2 0x14200 zerothread 36773 84309 0 0 3 0x14200 aiodoned aiodoned 52697 86013 0 0 3 0x14200 syncer update 15043 519430 0 0 3 0x14200 cleaner cleaner *24249 504592 0 0 7 0x14200 reaper 1409 435902 0 0 3 0x14200 pgdaemon pagedaemon 24454 116845 0 0 3 0x14200 bored viomb 33035 23567 0 0 3 0x40014200 acpi0 acpi0 66564 77745 0 0 3 0x40014200 idle1 82193 227047 0 0 3 0x14200 bored softnet1 33114 200259 0 0 3 0x14200 bored softnet0 72560 26459 0 0 3 0x14200 bored systqmp 55369 81990 0 0 3 0x14200 bored systq 35940 495873 0 0 3 0x14200 tmoslp softclockmp 41026 422510 0 0 3 0x40014200 tmoslp softclock 45207 195470 0 0 3 0x40014200 idle0 1 519982 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 68026 (syz-executor) thread 0xffff800029912d08 (292550) exclusive rrwlock inode r = 0 (0xffff800001d3c440) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xf0 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0x17e sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0xda sys/ufs/ufs/ufs_ihash.c:146 #5 ffs_vget+0x2e9 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x576 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0x25d sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x1a8 sys/kern/vfs_vops.c:394 #9 domkdirat+0x1f9 sys/kern/vfs_syscalls.c:3063 #10 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xffff800001bf1e98) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xf0 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0x17e sys/kern/vfs_vops.c:527 #4 vn_lock+0xca sys/kern/vfs_vnops.c:576 #5 vfs_lookup+0x1f7 sys/kern/vfs_lookup.c:431 #6 namei+0xe19 sys/kern/vfs_lookup.c:250 #7 domkdirat+0xe1 sys/kern/vfs_syscalls.c:3048 #8 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 Process 24249 (reaper) thread 0xffff800029895760 (504592) exclusive rwlock kqpsl r = 0 (0xffffffff852babb8) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320 #2 knote_processexit+0x2b sys/kern/kern_event.c:2235 #3 reaper+0x38d sys/kern/kern_exit.c:515 #4 proc_trampoline+0x10 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff854812c0) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:-1 #2 sleep_finish+0x423 sys/kern/kern_synch.c:369 #3 rw_do_enter_write+0x21f sys/kern/kern_rwlock.c:298 #4 knote_processexit+0x2b sys/kern/kern_event.c:2235 #5 reaper+0x38d sys/kern/kern_exit.c:515 #6 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11061 12251K 12534K 166960K 12389 0 pcb 17 24K 24K 166960K 64 0 rtable 225 11K 12K 166960K 333 0 pf 34 22K 38K 166960K 59 0 ifaddr 41 11K 12K 166960K 49 0 ifgroup 55 2K 2K 166960K 66 0 sysctl 4 1K 13K 166960K 11 0 counters 70 42K 43K 166960K 78 0 ioctlops 0 0K 4K 166960K 1505 0 iov 0 0K 16K 166960K 6 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1357 87K 87K 166960K 1594 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 2 2K 14K 166960K 12 0 VM map 2 1K 1K 166960K 2 0 sem 10 0K 0K 166960K 10 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 292K 166960K 11964 0 file desc 18 65K 93K 166960K 295 0 sigio 1 0K 0K 166960K 70 0 proc 72 128K 177K 166960K 572 0 subproc 72 9K 9K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 in_multi 89 6K 6K 166960K 89 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 11 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 73 506K 506K 166960K 73 0 exec 0 0K 2K 166960K 391 0 fusefs mount 1 36K 36K 166960K 1 0 tdb 3 1K 1K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 241 239K 256K 166960K 4546 0 UVM aobj 17 4K 4K 166960K 18 0 pinsyscall 1068 1790K 1791K 166960K 1445 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 12 0K 1K 166960K 30 0 temp 37 9162K 9482K 166960K 6218 0 kqueue 16 43K 53K 166960K 61 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 28 0 0 1 0 1 1 0 8 0 rtpcb 120 33 0 29 1 0 1 1 0 8 0 rtentry 176 105 0 1 5 0 5 5 0 8 0 unpcb 144 332 0 309 4 0 4 4 0 8 3 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 736 28 0 24 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 177 0 169 2 0 2 2 0 8 1 nd6 152 22 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 3 0 3 1 0 1 1 0 8 1 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 67 0 64 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 pfstitem 24 33 0 3 1 0 1 1 0 8 0 pfstkey 128 33 0 3 2 0 2 2 0 8 0 pfstate 448 33 0 3 4 0 4 4 0 8 0 pfrule 1360 23 0 18 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 414 0 0 26 0 26 26 0 8 0 art_table 40 415 0 0 5 0 5 5 0 8 0 art_node 32 105 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 1 0 1 0 8 0 semapl 72 8 0 0 1 0 1 1 0 8 0 shmpl 112 15 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1886 0 413 93 0 93 93 0 8 0 ffsino 296 1886 0 413 114 0 114 114 0 8 0 nchpl 144 2306 0 602 64 0 64 64 0 8 0 vnodes 216 2136 0 0 119 0 119 119 0 8 0 namei 1024 7345 0 7344 2 1 1 1 0 8 0 percpumem 16 55 0 4 1 0 1 1 0 8 0 kstatmem 264 35 0 8 2 0 2 2 0 8 0 scxspl 216 8265 0 8264 4 1 3 3 1 8 2 plimitpl 152 38 0 21 1 0 1 1 0 8 0 sigapl 424 613 0 565 7 1 6 7 0 8 0 knotepl 120 79 0 0 3 0 3 3 0 8 0 kqueuepl 224 81 0 67 1 0 1 1 0 8 0 pipepl 344 152 0 125 3 0 3 3 0 8 0 fdescpl 528 597 0 565 3 0 3 3 0 8 0 filepl 160 2854 0 2615 13 0 13 13 0 8 2 lockfpl 104 133 0 128 2 0 2 2 0 8 1 lockfspl 48 65 0 60 1 0 1 1 0 8 0 sessionpl 144 35 0 26 1 0 1 1 0 8 0 pgrppl 48 45 0 28 1 0 1 1 0 8 0 ucredpl 104 403 0 385 1 0 1 1 0 8 0 zombiepl 144 566 0 565 1 0 1 1 0 8 0 processpl 1232 613 0 565 5 0 5 5 0 8 0 procpl 664 878 0 823 6 0 6 6 0 8 0 sosppl 176 6 0 6 1 0 1 1 0 8 1 sockpl 752 546 0 511 10 0 10 10 0 8 6 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 0 mcl2k 2048 27 0 0 4 0 4 4 0 8 1 mextrefs 64 22 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 202 0 0 13 0 13 13 0 8 0 bufpl 272 2685 0 105 172 0 172 172 0 8 0 anonpl 32 4774 0 0 39 0 39 39 0 222 0 amapchunkpl 152 13358 0 12871 22 1 21 22 0 158 1 amappl16 200 2164 0 2133 5 3 2 5 0 8 0 amappl15 192 6 0 6 2 1 1 1 0 8 1 amappl14 184 428 0 426 1 0 1 1 0 8 0 amappl13 176 132 0 118 1 0 1 1 0 8 0 amappl12 168 856 0 825 2 0 2 2 0 8 0 amappl11 160 6 0 6 2 1 1 1 0 8 1 amappl10 152 99 0 85 1 0 1 1 0 8 0 amappl9 144 271 0 271 1 1 0 1 0 8 0 amappl8 136 98 0 96 1 0 1 1 0 8 0 amappl7 128 164 0 150 1 0 1 1 0 8 0 amappl6 120 172 0 170 1 0 1 1 0 8 0 amappl5 112 126 0 116 1 0 1 1 0 8 0 amappl4 104 296 0 276 1 0 1 1 0 8 0 amappl3 96 2518 0 2399 4 0 4 4 0 8 0 amappl2 88 538 0 476 2 0 2 2 0 8 0 amappl1 80 11029 0 10401 17 1 16 16 0 8 0 amappl 88 3798 0 3634 5 0 5 5 0 92 0 uvmvnodes 80 102 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 128 253 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 17 0 1 1 0 1 1 0 8 0 uaddrrnd 24 597 0 565 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 597 0 565 1 0 1 1 0 8 0 vmmpekpl 168 6846 0 6808 2 0 2 2 0 8 0 vmmpepl 168 47042 0 45098 88 0 88 88 0 357 1 vmsppl 488 596 0 565 5 0 5 5 0 8 0 rwobjpl 80 16515 0 15416 27 2 25 26 0 8 0 pdppl 4096 1203 0 1130 101 26 75 87 0 8 2 pvpl 32 12219 0 0 102 3 99 99 0 265 0 pmappl 256 596 0 565 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 448 0 32 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x19: leave x86_ipi_db(ffffffff85143ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 sys/dev/kcov.c:153 __mp_lock(ffffffff85480ac0) at __mp_lock+0x290 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85480ac0) at __mp_lock+0x290 sys/kern/kern_lock.c:173 intr_handler(ffff8000336e0310,ffff800000171180) at intr_handler+0x113 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7c638aa33ff0, count: 8 ddb{0}> trace x86_ipi_db(ffffffff85143ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x28 sys/dev/kcov.c:153 __mp_lock(ffffffff85480ac0) at __mp_lock+0x290 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85480ac0) at __mp_lock+0x290 sys/kern/kern_lock.c:173 intr_handler(ffff8000336e0310,ffff800000171180) at intr_handler+0x113 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7c638aa33ff0, count: -7 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x17: popq %rbp db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff84635b4e) at panic+0x270 sys/kern/subr_prf.c:198 __asan_load4_noabort(ffff80003b3267d8) at __asan_load4_noabort+0xa3 witness_checkorder(ffff80003b3267b8,9,0) at witness_checkorder+0x111 sys/kern/subr_witness.c:779 mtx_enter(ffff80003b3267a8) at mtx_enter+0x105 sys/kern/kern_lock.c:406 knote_processexit(ffff80003b3266a0) at knote_processexit+0x43 sys/kern/kern_event.c:2236 reaper(ffff800029895760) at reaper+0x38d sys/kern/kern_exit.c:515 end trace frame: 0x0, count: 8 ddb{1}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff84635b4e) at panic+0x270 sys/kern/subr_prf.c:198 __asan_load4_noabort(ffff80003b3267d8) at __asan_load4_noabort+0xa3 witness_checkorder(ffff80003b3267b8,9,0) at witness_checkorder+0x111 sys/kern/subr_witness.c:779 mtx_enter(ffff80003b3267a8) at mtx_enter+0x105 sys/kern/kern_lock.c:406 knote_processexit(ffff80003b3266a0) at knote_processexit+0x43 sys/kern/kern_event.c:2236 reaper(ffff800029895760) at reaper+0x38d sys/kern/kern_exit.c:515 end trace frame: 0x0, count: -7