ò¬Ú‰×ok‘¶ÔAèqÏ|Ï®¥6~ÒuQ¼'äÖ‡eÇ7<´ž¤dd횤D=Û/kkiœeÿa¼‹ƒó¹¤èµ9panic:W ApRoNIolNG_c:a ScPheL _NOiTt emLO_WmaERgEicD_ OcNhe cSYk:SC mALbLu f2 pl1 0c9p45u 2f86re26e ElXisIT t 0m ao di fStopped at savectx+0xb1: movl $0,%gs:0x530 TID PID UID PRFLAGS PFLAGS CPU COMMAND *185006 41206 0 0x2 0 0 syz-executor.1 240575 64906 0 0x14000 0x200 1 softnet savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffd9c30, 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 pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd8063663b00+16 0x0!=0x8bec90e919ea12cc ddb{0}> trace savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffd9c30, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800022db1c40 rbx 0 rdx 0xffff800020ac3ae8 rcx 0 rax 0x3a r8 0xffffffff81e3200f kprintf+0x16f r9 0x1 r10 0x25 r11 0xc8a25a784fd503f6 r12 0 r13 0 r14 0xffff800020ac3ae8 r15 0 rip 0xffffffff81ce33f1 savectx+0xb1 cs 0x8 rflags 0x46 rsp 0xffff800022db1bc0 ss 0x10 savectx+0xb1: movl $0,%gs:0x530 ddb{0}> show proc PROC (syz-executor.1) pid=185006 stat=onproc flags process=2 proc=0 pri=17, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800020a7c4e8,0xffff800020ac3618 process=0xffff800020a91690 user=0xffff800022dac000, vmspace=0xfffffd807f000b80 estcpu=36, cpticks=2, pctcpu=1.26 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 45261 381155 41206 0 2 0 syz-executor.1 20857 290596 0 0 3 0x14200 bored sosplice 62274 317455 60642 0 3 0x2 biowait syz-executor.0 43976 174761 1 0 3 0x100083 ttyin getty *41206 185006 60642 0 7 0x2 syz-executor.1 60642 460804 64348 0 3 0x82 nanosleep syz-fuzzer 60642 432964 64348 0 3 0x4000082 nanosleep syz-fuzzer 60642 369947 64348 0 3 0x4000082 thrsleep syz-fuzzer 60642 411016 64348 0 3 0x4000082 thrsleep syz-fuzzer 60642 154281 64348 0 3 0x4000082 thrsleep syz-fuzzer 60642 270618 64348 0 3 0x4000082 thrsleep syz-fuzzer 60642 378298 64348 0 3 0x4000082 thrsleep syz-fuzzer 60642 123097 64348 0 3 0x4000082 kqread syz-fuzzer 60642 119082 64348 0 3 0x4000082 thrsleep syz-fuzzer 60642 495257 64348 0 3 0x4000082 thrsleep syz-fuzzer 64348 240326 19730 0 3 0x10008a pause ksh 19730 479818 44924 0 3 0x92 select sshd 44924 366322 1 0 3 0x80 select sshd 56543 312841 6608 74 3 0x100092 bpf pflogd 6608 469223 1 0 3 0x80 netio pflogd 31231 99383 51706 73 3 0x100090 kqread syslogd 51706 327586 1 0 3 0x100082 netio syslogd 53999 509818 1 77 3 0x100090 poll dhclient 30808 242752 1 0 3 0x80 poll dhclient 90787 123211 0 0 2 0x14200 zerothread 53420 397401 0 0 3 0x14200 aiodoned aiodoned 29544 457209 0 0 3 0x14200 syncer update 18436 447425 0 0 3 0x14200 cleaner cleaner 22946 509169 0 0 3 0x14200 reaper reaper 79088 314213 0 0 3 0x14200 pgdaemon pagedaemon 60203 171196 0 0 3 0x14200 bored crynlk 9298 41335 0 0 3 0x14200 bored crypto 67327 291381 0 0 3 0x40014200 acpi0 acpi0 99032 281737 0 0 3 0x40014200 idle1 64906 240575 0 0 7 0x14200 softnet 10176 114395 0 0 3 0x14200 bored systqmp 73220 124155 0 0 3 0x14200 bored systq 59870 274676 0 0 3 0x40014200 bored softclock 62372 499758 0 0 3 0x40014200 idle0 52603 29714 0 0 3 0x14200 bored smr 1 93698 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &(curpg)->mdpage.pv_mtx r = 0 (0xfffffd8006a7c218) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pmap_enter+0x698 pmap_enter_pv sys/arch/amd64/amd64/pmap.c:1032 [inline] #3 pmap_enter+0x698 sys/arch/amd64/amd64/pmap.c:2788 #4 uvm_km_kmemalloc_pla+0x355 sys/uvm/uvm_km.c:389 #5 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274 #6 fork1+0x295 sys/kern/kern_fork.c:368 #7 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #7 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #8 Xsyscall+0x128 Process 62274 (syz-executor.0) thread 0xffff800020ac2eb8 (317455) exclusive rrwlock inode r = 0 (0xfffffd806faa3c50) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:453 #3 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x13e sys/ufs/ffs/ffs_vfsops.c:1352 #5 ffs_inode_alloc+0x1cf sys/ufs/ffs/ffs_alloc.c:392 #6 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1164 #7 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 #8 domkdirat+0x121 sys/kern/vfs_syscalls.c:3058 #9 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #9 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806faa30a0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:453 #3 VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:571 #5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419 #6 namei+0x63c sys/kern/vfs_lookup.c:249 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3043 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #9 Xsyscall+0x128 Process 41206 (syz-executor.1) thread 0xffff800020ac3ae8 (185006) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82647250) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x400 sys/arch/amd64/amd64/trap.c:570 #2 Xsyscall+0x128 exclusive mutex &(curpg)->mdpage.pv_mtx r = 0 (0xfffffd8006a7c218) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pmap_enter+0x698 pmap_enter_pv sys/arch/amd64/amd64/pmap.c:1032 [inline] #3 pmap_enter+0x698 sys/arch/amd64/amd64/pmap.c:2788 #4 uvm_km_kmemalloc_pla+0x355 sys/uvm/uvm_km.c:389 #5 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274 #6 fork1+0x295 sys/kern/kern_fork.c:368 #7 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #7 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #8 Xsyscall+0x128 Process 64906 (softnet) thread 0xffff800020a28750 (240575) shared rwlock netlock r = 0 (0xffffffff824fd6d8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 if_input_process+0x84 sys/net/if.c:941 #2 ifiq_process+0x80 sys/net/ifq.c:646 #3 taskq_thread+0x9c sys/kern/kern_task.c:369 #4 proc_trampoline+0x1c shared rwlock softnet r = 0 (0xffff80000002b0e0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 taskq_thread+0x8f sys/kern/kern_task.c:368 #2 proc_trampoline+0x1c ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9529 6429K 7396K 78643K 11690 0 pcb 13 8K 8K 78643K 289 0 rtable 113 4K 4K 78643K 363 0 ifaddr 86 17K 17K 78643K 138 0 counters 43 33K 34K 78643K 55 0 ioctlops 0 0K 4K 78643K 1500 0 iov 0 0K 16K 78643K 76 0 mount 1 1K 1K 78643K 1 0 vnodes 1230 77K 78K 78643K 1565 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 14 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 75 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 5 13K 25K 78643K 447 0 sigio 0 0K 0K 78643K 11 0 proc 63 63K 95K 78643K 558 0 subproc 32 2K 2K 78643K 51 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 227 0 in_multi 76 3K 4K 78643K 144 0 ether_multi 1 0K 0K 78643K 16 0 mrt 0 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 61 281K 281K 78643K 61 0 exec 0 0K 1K 78643K 278 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 125 54K 55K 78643K 2541 0 UVM aobj 59 6K 6K 78643K 64 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 178 0 NDP 13 0K 0K 78643K 28 0 temp 137 3022K 3102K 78643K 10161 0 kqueue 3 4K 9K 78643K 47 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 9 0 2 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 57 0 55 1 0 1 1 0 8 0 rtentry 112 75 0 30 2 0 2 2 0 8 0 unpcb 120 341 0 331 1 0 1 1 0 8 0 syncache 264 7 0 7 3 2 1 1 0 8 1 tcpqe 32 129 0 129 2 2 0 1 0 8 0 tcpcb 544 394 0 390 2 0 2 2 0 8 1 inpcb 280 1364 0 1357 2 0 2 2 0 8 1 rttmr 72 2 0 2 2 1 1 1 0 8 1 nd6 48 9 0 6 1 0 1 1 0 8 0 ppxss 1128 1 0 1 1 1 0 1 0 8 0 pffrag 232 5 0 5 2 1 1 1 0 482 1 pffrnode 88 5 0 5 2 1 1 1 0 8 1 pffrent 40 225 0 225 2 1 1 1 0 8 1 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 53 0 7 1 0 1 1 0 8 0 pfstkey 112 53 0 7 2 0 2 2 0 8 0 pfstate 328 53 0 7 4 0 4 4 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 340 0 130 15 1 14 15 0 8 0 art_table 32 342 0 130 2 0 2 2 0 8 0 art_node 16 72 0 31 1 0 1 1 0 8 0 sysvmsgpl 40 33 0 16 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 69 0 59 1 0 1 1 0 8 0 shmpl 112 62 0 5 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2015 0 608 46 0 46 46 0 8 0 ffsino 272 2015 0 608 95 0 95 95 0 8 0 nchpl 144 2833 0 1229 61 0 61 61 0 8 0 uvmvnodes 72 2349 0 0 43 0 43 43 0 8 0 vnodes 208 2349 0 0 124 0 124 124 0 8 0 namei 1024 8389 0 8388 1 0 1 1 0 8 0 percpumem 16 38 0 6 1 0 1 1 0 8 0 vcpupl 1984 5 0 0 1 0 1 1 0 8 0 vmpool 560 9 0 4 1 0 1 1 0 8 0 scsiplug 64 1 0 1 1 1 0 1 0 8 0 scxspl 192 8468 0 8467 7 6 1 6 0 8 0 plimitpl 152 53 0 45 1 0 1 1 0 8 0 sigapl 432 644 0 629 3 1 2 3 0 8 0 futexpl 56 9441 0 9441 1 0 1 1 0 8 1 knotepl 112 126 0 107 1 0 1 1 0 8 0 kqueuepl 104 67 0 65 1 0 1 1 0 8 0 pipelkpl 48 221 0 211 1 0 1 1 0 8 0 pipepl 120 442 0 423 2 1 1 2 0 8 0 fdescpl 496 645 0 629 3 0 3 3 0 8 0 filepl 152 5085 0 4985 7 1 6 6 0 8 2 lockfpl 104 86 0 85 1 0 1 1 0 8 0 lockfspl 48 33 0 32 1 0 1 1 0 8 0 sessionpl 112 20 0 9 1 0 1 1 0 8 0 pgrppl 48 52 0 41 1 0 1 1 0 8 0 ucredpl 96 475 0 466 1 0 1 1 0 8 0 zombiepl 144 631 0 631 1 0 1 1 0 8 1 processpl 960 663 0 631 5 0 5 5 0 8 0 procpl 624 1678 0 1637 5 1 4 5 0 8 0 sosppl 128 6 0 6 1 0 1 1 0 8 1 sockpl 400 1776 0 1757 6 2 4 6 0 8 2 mcl64k 65536 16 0 0 2 0 2 2 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 7 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 12 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 169 0 0 21 0 21 21 0 8 0 mtagpl 80 47 0 0 1 0 1 1 0 8 0 mbufpl 256 356 0 0 21 0 21 21 0 8 0 bufpl 280 5009 0 196 344 0 344 344 0 8 0 anonpl 16 70814 0 53924 70 1 69 69 0 125 0 amapchunkpl 152 5471 0 5335 26 10 16 20 0 158 9 amappl16 192 2751 0 1830 48 1 47 47 0 8 0 amappl15 184 196 0 192 1 0 1 1 0 8 0 amappl14 176 301 0 297 1 0 1 1 0 8 0 amappl12 160 4 0 3 1 0 1 1 0 8 0 amappl11 152 62 0 47 1 0 1 1 0 8 0 amappl10 144 10 0 7 1 0 1 1 0 8 0 amappl9 136 617 0 613 1 0 1 1 0 8 0 amappl8 128 147 0 118 2 0 2 2 0 8 0 amappl7 120 119 0 106 1 0 1 1 0 8 0 amappl6 112 61 0 53 1 0 1 1 0 8 0 amappl5 104 157 0 143 1 0 1 1 0 8 0 amappl4 96 911 0 879 1 0 1 1 0 8 0 amappl3 88 330 0 322 1 0 1 1 0 8 0 amappl2 80 4336 0 4266 3 1 2 3 0 8 0 amappl1 72 24295 0 23861 25 15 10 20 0 8 0 amappl 80 1958 0 1913 2 0 2 2 0 84 0 dma4096 4096 1 0 1 1 1 0 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 64 63 0 5 1 0 1 1 0 8 0 uaddrrnd 24 654 0 633 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 654 0 633 1 0 1 1 0 8 0 vmmpekpl 168 9195 0 9163 2 0 2 2 0 8 0 vmmpepl 168 86265 0 84182 136 21 115 125 0 357 18 vmsppl 368 653 0 633 2 0 2 2 0 8 0 pdppl 4096 1315 0 1271 6 0 6 6 0 8 0 pvpl 32 230323 0 210292 169 0 169 169 0 265 4 pmappl 232 653 0 633 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 189 0 7 6 0 6 6 0 8 0