panic: poWoAlR_NcIaNchGe_i:te Sm_PmLa gNic_OcTh eLckO:W mEbRuEfD plON c pSuY SfCrAeeL Lli s2 t 9m2o7d3i5f0i4e2d:8 itEeXmI Ta d0d ar 0xStopped at savectx+0xb1: movl $0,%gs:0x530 TID PID UID PRFLAGS PFLAGS CPU COMMAND *199654 57141 0 0x2 0 0 syz-executor.0 449209 84377 0 0x14000 0x200 1 softnet savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffc0740, 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 0xfffffd807badf800+16 0x0!=0x8a053df07c6c71c7 ddb{0}> trace savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffc0740, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800020b6b1a0 rbx 0 rdx 0xffff800020a6c758 rcx 0 rax 0x39 r8 0xffffffff817c6bdf kprintf+0x16f r9 0x1 r10 0x25 r11 0x948be3428968db79 r12 0 r13 0 r14 0xffff800020a6c758 r15 0 rip 0xffffffff813683f1 savectx+0xb1 cs 0x8 rflags 0x46 rsp 0xffff800020b6b120 ss 0x10 savectx+0xb1: movl $0,%gs:0x530 ddb{0}> show proc PROC (syz-executor.0) pid=199654 stat=onproc flags process=2 proc=0 pri=74, usrpri=74, nice=20 forw=0xffffffffffffffff, list=0xffff800020a6c4e8,0xffff800020ac7d68 process=0xffff800020a803d0 user=0xffff800020b66000, vmspace=0xfffffd807f0002e0 estcpu=24, cpticks=1, pctcpu=0.19 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 54016 446415 57141 0 2 0 syz-executor.0 69625 234339 0 0 3 0x14200 bored sosplice 13365 269330 95477 0 3 0x2 biowait syz-executor.1 *57141 199654 95477 0 7 0x2 syz-executor.0 95477 54438 55197 0 3 0x82 thrsleep syz-fuzzer 95477 80232 55197 0 3 0x4000082 nanosleep syz-fuzzer 95477 167883 55197 0 3 0x4000082 thrsleep syz-fuzzer 95477 182341 55197 0 3 0x4000082 thrsleep syz-fuzzer 95477 207573 55197 0 3 0x4000082 thrsleep syz-fuzzer 95477 298135 55197 0 3 0x4000082 kqread syz-fuzzer 95477 138687 55197 0 3 0x4000082 thrsleep syz-fuzzer 95477 284326 55197 0 3 0x4000082 thrsleep syz-fuzzer 95477 508592 55197 0 3 0x4000082 thrsleep syz-fuzzer 95477 110047 55197 0 3 0x4000082 nanosleep syz-fuzzer 55197 419543 63910 0 3 0x10008a pause ksh 63910 274751 73955 0 3 0x92 select sshd 46943 169040 1 0 3 0x100083 ttyin getty 73955 433733 1 0 3 0x80 select sshd 84456 57952 61365 74 3 0x100092 bpf pflogd 61365 518711 1 0 3 0x80 netio pflogd 40110 97727 79795 73 3 0x100090 kqread syslogd 79795 141701 1 0 3 0x100082 netio syslogd 9085 278260 1 77 3 0x100090 poll dhclient 34493 404207 1 0 3 0x80 poll dhclient 72841 206454 0 0 3 0x14200 bored smr 15738 108708 0 0 3 0x14200 pgzero zerothread 79165 256471 0 0 3 0x14200 aiodoned aiodoned 28397 513442 0 0 3 0x14200 syncer update 39119 476457 0 0 3 0x14200 cleaner cleaner 34427 76330 0 0 3 0x14200 reaper reaper 54669 228504 0 0 3 0x14200 pgdaemon pagedaemon 36162 321972 0 0 3 0x14200 bored crynlk 44400 95049 0 0 3 0x14200 bored crypto 95827 451771 0 0 3 0x40014200 acpi0 acpi0 11421 214291 0 0 3 0x40014200 idle1 84377 449209 0 0 7 0x14200 softnet 93926 269730 0 0 3 0x14200 bored systqmp 31566 434531 0 0 3 0x14200 bored systq 47797 82097 0 0 3 0x40014200 bored softclock 29441 230436 0 0 3 0x40014200 idle0 1 356212 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex vmmpepl r = 0 (0xffffffff8263e678) #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_get+0xbf sys/kern/subr_pool.c:578 #4 uvm_mapent_alloc+0x2d2 sys/uvm/uvm_map.c:1751 #5 uvm_map_mkentry+0x75 sys/uvm/uvm_map.c:1656 #6 uvm_mapent_clone+0x9e sys/uvm/uvm_map.c:3778 #7 uvm_mapent_forkcopy+0x6a sys/uvm/uvm_map.c:3879 #8 uvmspace_fork+0x226 #9 process_new+0x16c sys/kern/kern_fork.c:257 #10 fork1+0x31b sys/kern/kern_fork.c:376 #11 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #11 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #12 Xsyscall+0x128 Process 13365 (syz-executor.1) thread 0xffff800020ac7d58 (269330) exclusive rrwlock inode r = 0 (0xfffffd80638d73d0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:311 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:575 #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:1329 #8 ufs_lookup+0x14b7 sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:90 #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 (0xfffffd806b44e098) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:311 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:575 #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 57141 (syz-executor.0) thread 0xffff800020a6c758 (199654) exclusive rwlock vmmaplk r = 0 (0xfffffd80627da478) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:311 #2 vm_map_lock_ln+0x111 sys/uvm/uvm_map.c:5448 #3 uvmspace_fork+0x113 sys/uvm/uvm_map.c:4072 #4 process_new+0x16c sys/kern/kern_fork.c:257 #5 fork1+0x31b sys/kern/kern_fork.c:376 #6 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #6 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #7 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xfffffd807f0002f8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:311 #2 vm_map_lock_ln+0x111 sys/uvm/uvm_map.c:5448 #3 uvmspace_fork+0x37 sys/uvm/uvm_map.c:4063 #4 process_new+0x16c sys/kern/kern_fork.c:257 #5 fork1+0x31b sys/kern/kern_fork.c:376 #6 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #6 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #7 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82634b10) #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 vmmpepl r = 0 (0xffffffff8263e678) #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_get+0xbf sys/kern/subr_pool.c:578 #4 uvm_mapent_alloc+0x2d2 sys/uvm/uvm_map.c:1751 #5 uvm_map_mkentry+0x75 sys/uvm/uvm_map.c:1656 #6 uvm_mapent_clone+0x9e sys/uvm/uvm_map.c:3778 #7 uvm_mapent_forkcopy+0x6a sys/uvm/uvm_map.c:3879 #8 uvmspace_fork+0x226 #9 process_new+0x16c sys/kern/kern_fork.c:257 #10 fork1+0x31b sys/kern/kern_fork.c:376 #11 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #11 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #12 Xsyscall+0x128 Process 84377 (softnet) thread 0xffff800020a18750 (449209) shared rwlock netlock r = 0 (0xffffffff824ec4d8) #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 9518 6415K 7063K 78643K 11365 0 pcb 13 8K 8K 78643K 80 0 rtable 97 3K 3K 78643K 299 0 ifaddr 82 16K 17K 78643K 129 0 counters 43 33K 34K 78643K 55 0 ioctlops 0 0K 4K 78643K 1496 0 iov 0 0K 16K 78643K 203 0 mount 1 1K 1K 78643K 1 0 vnodes 1220 77K 77K 78643K 1430 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 13 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 34 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 5 13K 25K 78643K 289 0 sigio 0 0K 0K 78643K 3 0 proc 61 63K 95K 78643K 478 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 49 0 in_multi 73 3K 3K 78643K 129 0 ether_multi 1 0K 0K 78643K 12 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 231 0 pfkey data 0 0K 0K 78643K 2 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 122 103K 103K 78643K 1902 0 UVM aobj 26 2K 2K 78643K 43 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 54 0 NDP 12 0K 0K 78643K 25 0 temp 122 3024K 3088K 78643K 4843 0 kqueue 3 4K 16K 78643K 20 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 6 0 1 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 33 0 31 1 0 1 1 0 8 0 rtentry 112 62 0 22 2 0 2 2 0 8 0 unpcb 120 282 0 271 1 0 1 1 0 8 0 syncache 264 6 0 6 2 2 0 1 0 8 0 tcpqe 32 12 0 12 1 1 0 1 0 8 0 tcpcb 544 120 0 116 1 0 1 1 0 8 0 inpcb 280 437 0 430 2 0 2 2 0 8 1 rttmr 72 2 0 2 1 0 1 1 0 8 1 nd6 48 10 0 6 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 pffrag 232 4 0 4 2 2 0 1 0 482 0 pffrnode 88 4 0 4 2 2 0 1 0 8 0 pffrent 40 180 0 180 2 2 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 39 0 7 1 0 1 1 0 8 0 pfstkey 112 39 0 7 1 0 1 1 0 8 0 pfstate 328 39 0 7 3 0 3 3 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 256 267 0 91 13 0 13 13 0 8 0 art_table 32 268 0 91 2 0 2 2 0 8 0 art_node 16 61 0 24 1 0 1 1 0 8 0 sysvmsgpl 40 38 0 19 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 26 0 16 1 0 1 1 0 8 0 shmpl 112 41 0 17 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1795 0 391 46 0 46 46 0 8 0 ffsino 272 1795 0 391 95 0 95 95 0 8 0 nchpl 144 2541 0 928 61 0 61 61 0 8 0 uvmvnodes 72 2008 0 0 37 0 37 37 0 8 0 vnodes 208 2008 0 0 106 0 106 106 0 8 0 namei 1024 7530 0 7530 1 0 1 1 0 8 1 percpumem 16 38 0 6 1 0 1 1 0 8 0 vcpupl 1984 13 0 0 2 0 2 2 0 8 0 vmpool 560 13 0 0 1 0 1 1 0 8 0 scxspl 192 7506 0 7505 8 7 1 7 0 8 0 plimitpl 152 36 0 28 1 0 1 1 0 8 0 sigapl 424 505 0 473 4 0 4 4 0 8 0 futexpl 56 5832 0 5832 1 0 1 1 0 8 1 knotepl 112 74 0 55 1 0 1 1 0 8 0 kqueuepl 144 133 0 131 1 0 1 1 0 8 0 pipelkpl 48 155 0 145 1 0 1 1 0 8 0 pipepl 120 310 0 291 2 1 1 2 0 8 0 fdescpl 496 489 0 473 3 0 3 3 0 8 0 filepl 152 3573 0 3473 6 1 5 6 0 8 1 lockfpl 104 155 0 154 1 0 1 1 0 8 0 lockfspl 48 48 0 47 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 22 0 11 1 0 1 1 0 8 0 ucredpl 96 321 0 312 1 0 1 1 0 8 0 zombiepl 144 473 0 473 1 0 1 1 0 8 1 processpl 960 505 0 473 5 0 5 5 0 8 0 procpl 624 1120 0 1079 4 0 4 4 0 8 0 sosppl 128 13 0 13 1 0 1 1 0 8 1 sockpl 400 760 0 740 5 1 4 4 0 8 1 mcl64k 65536 6 0 0 1 0 1 1 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 5 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 201 0 0 25 0 25 25 0 8 0 mtagpl 80 26 0 0 1 0 1 1 0 8 0 mbufpl 256 319 0 0 20 0 20 20 0 8 0 bufpl 280 6840 0 573 448 0 448 448 0 8 0 anonpl 16 61393 0 44130 87 7 80 86 0 124 9 amapchunkpl 152 2777 0 2639 13 6 7 13 0 158 0 amappl16 192 2428 0 1484 60 11 49 60 0 8 1 amappl15 184 2 0 1 2 1 1 1 0 8 0 amappl14 176 6 0 3 2 1 1 1 0 8 0 amappl13 168 155 0 153 1 0 1 1 0 8 0 amappl12 160 14 0 12 1 0 1 1 0 8 0 amappl11 152 195 0 176 1 0 1 1 0 8 0 amappl10 144 28 0 22 1 0 1 1 0 8 0 amappl9 136 390 0 387 1 0 1 1 0 8 0 amappl8 128 320 0 294 1 0 1 1 0 8 0 amappl7 120 119 0 108 1 0 1 1 0 8 0 amappl6 112 153 0 147 1 0 1 1 0 8 0 amappl5 104 390 0 375 1 0 1 1 0 8 0 amappl4 96 638 0 606 2 1 1 2 0 8 0 amappl3 88 111 0 106 1 0 1 1 0 8 0 amappl2 80 3002 0 2938 3 1 2 3 0 8 0 amappl1 72 20359 0 19934 25 15 10 20 0 8 0 amappl 80 1374 0 1327 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 42 0 17 1 0 1 1 0 8 0 uaddrrnd 24 502 0 473 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 502 0 473 1 0 1 1 0 8 0 vmmpekpl 168 7755 0 7722 2 0 2 2 0 8 0 vmmpepl 168 67108 0 65025 125 18 107 121 0 357 10 vmsppl 368 501 0 473 3 0 3 3 0 8 0 pdppl 4096 1012 0 959 7 0 7 7 0 8 0 pvpl 32 196745 0 176441 202 6 196 202 0 265 28 pmappl 232 501 0 473 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 186 0 4 6 0 6 6 0 8 0