panic:W ApoRNoIlN_Gc:a chSPeL_ iNtOeTm _LOmaWgEiRcE_cDh eOcNk :S YmSCbAuLfpL l2 cp1u8 85fr4e2e11 7l0i EsXt ITmo d0 ifa i edStopped at savectx+0xb1: movl $0,%gs:0x530 TID PID UID PRFLAGS PFLAGS CPU COMMAND *337271 87248 0 0x2 0 0 syz-executor.1 174301 76896 0 0x12 0 1 sshd savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffd3cf0, 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 0xfffffd807d509b00+16 0x0!=0xc66aff598a14becc ddb{0}> trace savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffd3cf0, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800020ba5300 rbx 0 rdx 0xffff800020ad7ae8 rcx 0 rax 0x3a r8 0xffffffff81d5b7df kprintf+0x16f r9 0x1 r10 0x25 r11 0x698d7d658ae25828 r12 0 r13 0 r14 0xffff800020ad7ae8 r15 0 rip 0xffffffff81b0b3f1 savectx+0xb1 cs 0x8 rflags 0x46 rsp 0xffff800020ba5280 ss 0x10 savectx+0xb1: movl $0,%gs:0x530 ddb{0}> show proc PROC (syz-executor.1) pid=337271 stat=onproc flags process=2 proc=0 pri=79, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800020a7dd48,0xffff800020ad69e8 process=0xffff800020a912d0 user=0xffff800020ba0000, vmspace=0xfffffd807efffb80 estcpu=29, cpticks=1, pctcpu=0.19 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 29384 58964 87248 0 2 0 syz-executor.1 75733 196519 0 0 3 0x14200 bored sosplice *87248 337271 55278 0 7 0x2 syz-executor.1 2701 209726 55278 0 3 0x2 biowait syz-executor.0 55278 175228 79926 0 3 0x82 kqread syz-fuzzer 55278 491096 79926 0 3 0x4000082 nanosleep syz-fuzzer 55278 95873 79926 0 3 0x4000082 nanosleep syz-fuzzer 55278 331600 79926 0 3 0x4000082 thrsleep syz-fuzzer 55278 364229 79926 0 3 0x4000082 thrsleep syz-fuzzer 55278 108291 79926 0 3 0x4000082 thrsleep syz-fuzzer 55278 285757 79926 0 3 0x4000082 thrsleep syz-fuzzer 55278 301057 79926 0 3 0x4000082 thrsleep syz-fuzzer 55278 57713 79926 0 3 0x4000082 thrsleep syz-fuzzer 55278 46232 79926 0 3 0x4000082 thrsleep syz-fuzzer 55278 254273 79926 0 3 0x4000082 thrsleep syz-fuzzer 79926 439806 76896 0 3 0x10008a pause ksh 76896 174301 91950 0 7 0x12 sshd 44898 415163 1 0 3 0x100083 ttyin getty 91950 134853 1 0 3 0x80 select sshd 62240 133711 61345 74 3 0x100092 bpf pflogd 61345 29697 1 0 3 0x80 netio pflogd 97541 195902 9297 73 3 0x100090 kqread syslogd 9297 232986 1 0 3 0x100082 netio syslogd 15213 411526 0 0 2 0x14200 zerothread 49108 441411 0 0 3 0x14200 aiodoned aiodoned 91958 154684 0 0 3 0x14200 syncer update 23866 406014 0 0 3 0x14200 cleaner cleaner 32707 215998 0 0 3 0x14200 reaper reaper 8887 276287 0 0 3 0x14200 pgdaemon pagedaemon 53093 439764 0 0 3 0x14200 bored crynlk 13979 49973 0 0 3 0x14200 bored crypto 43918 40250 0 0 3 0x40014200 acpi0 acpi0 51552 252141 0 0 3 0x40014200 idle1 75527 98524 0 0 3 0x14200 bored softnet 35441 85011 0 0 3 0x14200 bored systqmp 48689 423832 0 0 3 0x14200 bored systq 71985 160651 0 0 3 0x40014200 bored softclock 49740 40687 0 0 3 0x40014200 idle0 18722 136369 0 0 3 0x14200 bored smr 1 260988 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex vmmpekpl r = 0 (0xffffffff8264f170) #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 pool_put+0x64 sys/kern/subr_pool.c:792 #4 uvm_unmap_detach+0x231 sys/uvm/uvm_map.c:1577 #5 uvm_map+0xe24 sys/uvm/uvm_map.c:1414 #6 uvm_km_kmemalloc_pla+0x11d sys/uvm/uvm_km.c:334 #7 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274 #8 fork1+0x295 sys/kern/kern_fork.c:368 #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 Process 87248 (syz-executor.1) thread 0xffff800020ad7ae8 (337271) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff82653998) #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 vmmpekpl r = 0 (0xffffffff8264f170) #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 pool_put+0x64 sys/kern/subr_pool.c:792 #4 uvm_unmap_detach+0x231 sys/uvm/uvm_map.c:1577 #5 uvm_map+0xe24 sys/uvm/uvm_map.c:1414 #6 uvm_km_kmemalloc_pla+0x11d sys/uvm/uvm_km.c:334 #7 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274 #8 fork1+0x295 sys/kern/kern_fork.c:368 #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 Process 2701 (syz-executor.0) thread 0xffff800020a7c4e8 (209726) exclusive rrwlock inode r = 0 (0xfffffd807e34fe70) #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 vget+0x1c8 sys/kern/vfs_subr.c:671 #6 ufs_ihashget+0x141 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x74 sys/ufs/ffs/ffs_vfsops.c:1323 #8 ufs_lookup+0x14b7 sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:91 #10 vfs_lookup+0x7a6 sys/kern/vfs_lookup.c:568 #11 namei+0x63c sys/kern/vfs_lookup.c:249 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1860 #13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b4316f8) #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 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1860 #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 76896 (sshd) thread 0xffff800020aeec40 (174301) exclusive rwlock netlock r = 0 (0xffffffff82460e68) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sosend+0x559 sys/kern/uipc_socket.c:537 #3 dofilewritev+0x1b7 sys/kern/sys_generic.c:364 #4 sys_write+0x83 sys/kern/sys_generic.c:284 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #6 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9515 6353K 6935K 78643K 10937 0 pcb 13 8K 8K 78643K 85 0 rtable 106 4K 4K 78643K 290 0 ifaddr 76 14K 15K 78643K 114 0 counters 43 33K 34K 78643K 53 0 ioctlops 0 0K 4K 78643K 1486 0 iov 0 0K 16K 78643K 28 0 mount 1 1K 1K 78643K 1 0 vnodes 1224 77K 77K 78643K 1316 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 23 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 5 13K 25K 78643K 176 0 proc 55 51K 95K 78643K 468 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 21 0 in_multi 44 2K 2K 78643K 89 0 ether_multi 1 0K 0K 78643K 14 0 mrt 0 0K 0K 78643K 6 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 49 228K 228K 78643K 49 0 exec 0 0K 1K 78643K 211 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 103 21K 38K 78643K 1552 0 UVM aobj 11 2K 2K 78643K 13 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 46 0 NDP 13 0K 0K 78643K 23 0 temp 124 3019K 3083K 78643K 3729 0 kqueue 3 4K 8K 78643K 10 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 8 0 3 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 29 0 29 1 0 1 1 0 8 1 rtentry 112 57 0 17 2 0 2 2 0 8 0 unpcb 120 452 0 444 2 0 2 2 0 8 1 syncache 264 5 0 5 2 2 0 1 0 8 0 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 544 83 0 77 1 0 1 1 0 8 0 inpcb 280 386 0 380 2 0 2 2 0 8 1 rttmr 72 2 0 2 2 2 0 1 0 8 0 nd6 48 7 0 3 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 1 0 1 0 8 0 ppxss 1128 1 0 1 1 1 0 1 0 8 0 pffrag 232 6 0 6 1 1 0 1 0 482 0 pffrnode 88 6 0 6 1 1 0 1 0 8 0 pffrent 40 267 0 267 1 1 0 1 0 8 0 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 49 0 7 1 0 1 1 0 8 0 pfstkey 112 49 0 7 2 0 2 2 0 8 0 pfstate 328 49 0 7 4 0 4 4 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 291 0 58 15 0 15 15 0 8 0 art_table 32 292 0 58 2 0 2 2 0 8 0 art_node 16 56 0 19 1 0 1 1 0 8 0 sysvmsgpl 40 20 0 17 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 19 0 9 1 0 1 1 0 8 0 shmpl 112 11 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1639 0 232 46 0 46 46 0 8 0 ffsino 272 1639 0 232 95 0 95 95 0 8 0 nchpl 144 2062 0 447 61 0 61 61 0 8 0 uvmvnodes 72 1753 0 0 32 0 32 32 0 8 0 vnodes 208 1753 0 0 93 0 93 93 0 8 0 namei 1024 5528 0 5528 1 0 1 1 0 8 1 percpumem 16 37 0 5 1 0 1 1 0 8 0 vcpupl 1984 1 0 0 1 0 1 1 0 8 0 vmpool 560 3 0 2 2 1 1 1 0 8 0 scxspl 192 6104 0 6103 8 7 1 7 0 8 0 plimitpl 152 23 0 16 1 0 1 1 0 8 0 sigapl 432 375 0 362 3 1 2 3 0 8 0 futexpl 56 3053 0 3053 1 0 1 1 0 8 1 knotepl 112 62 0 43 1 0 1 1 0 8 0 kqueuepl 104 26 0 24 1 0 1 1 0 8 0 pipelkpl 48 104 0 94 1 0 1 1 0 8 0 pipepl 120 208 0 189 1 0 1 1 0 8 0 fdescpl 496 376 0 362 3 0 3 3 0 8 0 filepl 152 2620 0 2531 6 0 6 6 0 8 2 lockfpl 104 26 0 26 1 0 1 1 0 8 1 lockfspl 48 10 0 10 1 0 1 1 0 8 1 sessionpl 112 18 0 9 1 0 1 1 0 8 0 pgrppl 48 18 0 9 1 0 1 1 0 8 0 ucredpl 96 152 0 144 1 0 1 1 0 8 0 zombiepl 144 362 0 362 1 0 1 1 0 8 1 processpl 960 392 0 362 5 0 5 5 0 8 0 procpl 624 764 0 724 4 0 4 4 0 8 0 srpgc 64 2 0 2 1 1 0 1 0 8 0 sosppl 128 2 0 2 1 1 0 1 0 8 0 sockpl 400 870 0 856 6 0 6 6 0 8 3 mcl64k 65536 9 0 0 2 0 2 2 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 6 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 173 0 0 21 0 21 21 0 8 0 mtagpl 80 13 0 0 1 0 1 1 0 8 0 mbufpl 256 455 0 0 28 0 28 28 0 8 0 bufpl 280 4312 0 191 295 0 295 295 0 8 0 anonpl 16 61404 0 45508 83 2 81 81 0 125 16 amapchunkpl 152 2061 0 1930 9 0 9 9 0 158 1 amappl16 192 2276 0 1413 64 10 54 56 0 8 10 amappl15 184 139 0 134 1 0 1 1 0 8 0 amappl14 176 28 0 26 1 0 1 1 0 8 0 amappl13 168 64 0 63 2 1 1 1 0 8 0 amappl12 160 11 0 6 1 0 1 1 0 8 0 amappl11 152 55 0 47 1 0 1 1 0 8 0 amappl10 144 16 0 8 1 0 1 1 0 8 0 amappl9 136 610 0 606 1 0 1 1 0 8 0 amappl8 128 125 0 101 1 0 1 1 0 8 0 amappl7 120 108 0 98 1 0 1 1 0 8 0 amappl6 112 56 0 51 1 0 1 1 0 8 0 amappl5 104 132 0 120 1 0 1 1 0 8 0 amappl4 96 687 0 660 1 0 1 1 0 8 0 amappl3 88 115 0 108 1 0 1 1 0 8 0 amappl2 80 2187 0 2125 3 1 2 3 0 8 0 amappl1 72 17999 0 17595 26 16 10 21 0 8 0 amappl 80 1025 0 986 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 12 0 2 1 0 1 1 0 8 0 uaddrrnd 24 379 0 364 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 379 0 364 1 0 1 1 0 8 0 vmmpekpl 168 6925 0 6893 2 0 2 2 0 8 0 vmmpepl 168 53822 0 51882 119 16 103 111 0 357 12 vmsppl 368 378 0 364 2 0 2 2 0 8 0 pdppl 4096 765 0 729 6 1 5 6 0 8 0 pvpl 32 180720 0 161813 193 1 192 192 0 265 36 pmappl 232 378 0 364 2 1 1 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 192 0 4 6 0 6 6 0 8 0