login: panic: pool_cache_item_magicW_AcRhNIeNckG:: mSbPuL fpNOl T cLpOu WEfRrEeDe OlNi stSY mSCoAdLiLfi 1e3d6: -i1t1em12 0a0d dErX 0ITxf f0 f9ff d8Stopped at savectx+0xb1: movl $0,%gs:0x530 TID PID UID PRFLAGS PFLAGS CPU COMMAND *468088 34430 0 0x2 0 0 syz-executor.0 213562 71387 0 0x14000 0x200 1 softnet savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffe4e10, 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 0xfffffd8070611f00+24 0xc3a78d046d155e89!=0xc3a78d84006ff689 ddb{0}> trace savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffe4e10, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800020f6b780 rbx 0 rdx 0xffff800020e6c278 rcx 0 rax 0x39 r8 0xffffffff816473af kprintf+0x16f r9 0x1 r10 0x25 r11 0x25cbf7e3b51e5dcf r12 0 r13 0 r14 0xffff800020e6c278 r15 0 rip 0xffffffff821643f1 savectx+0xb1 cs 0x8 rflags 0x46 rsp 0xffff800020f6b700 ss 0x10 savectx+0xb1: movl $0,%gs:0x530 ddb{0}> show proc PROC (syz-executor.0) pid=468088 stat=onproc flags process=2 proc=0 pri=17, usrpri=69, nice=20 forw=0xffffffffffffffff, list=0xffff800020e6dd48,0xffff800020e6d878 process=0xffff800020e80010 user=0xffff800020f66000, vmspace=0xfffffd807f0008a0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 28025 333368 0 0 3 0x14200 bored sosplice 57722 72080 37886 0 3 0x82 nanosleep syz-executor.1 *34430 468088 37886 0 7 0x2 syz-executor.0 37886 193861 49932 0 3 0x82 nanosleep syz-fuzzer 37886 127519 49932 0 3 0x4000082 nanosleep syz-fuzzer 37886 485634 49932 0 3 0x4000082 thrsleep syz-fuzzer 37886 223573 49932 0 3 0x4000082 thrsleep syz-fuzzer 37886 147294 49932 0 3 0x4000082 thrsleep syz-fuzzer 37886 3445 49932 0 3 0x4000082 thrsleep syz-fuzzer 37886 254544 49932 0 3 0x4000082 thrsleep syz-fuzzer 37886 80944 49932 0 3 0x4000082 thrsleep syz-fuzzer 37886 139690 49932 0 3 0x4000082 kqread syz-fuzzer 37886 9410 49932 0 3 0x4000082 thrsleep syz-fuzzer 49932 354158 42823 0 3 0x10008a pause ksh 42823 229080 60580 0 3 0x92 select sshd 46930 254421 1 0 3 0x100083 ttyin getty 60580 402842 1 0 3 0x80 select sshd 35554 88919 32338 74 3 0x100092 bpf pflogd 32338 108105 1 0 3 0x80 netio pflogd 9084 102968 35154 73 3 0x100090 kqread syslogd 35154 269165 1 0 3 0x100082 netio syslogd 58184 222206 1 77 3 0x100090 poll dhclient 69862 274706 1 0 3 0x80 poll dhclient 27561 414782 0 0 3 0x14200 bored smr 9376 390292 0 0 3 0x14200 pgzero zerothread 70507 21507 0 0 3 0x14200 aiodoned aiodoned 14138 446180 0 0 3 0x14200 syncer update 89220 475938 0 0 3 0x14200 cleaner cleaner 10663 186661 0 0 3 0x14200 reaper reaper 15774 383467 0 0 3 0x14200 pgdaemon pagedaemon 13299 487751 0 0 3 0x14200 bored crynlk 49741 223553 0 0 3 0x14200 bored crypto 98926 180192 0 0 3 0x40014200 acpi0 acpi0 42746 180165 0 0 3 0x40014200 idle1 71387 213562 0 0 7 0x14200 softnet 29839 478416 0 0 3 0x14200 bored systqmp 19389 291076 0 0 3 0x14200 bored systq 30873 457588 0 0 3 0x40014200 bored softclock 99580 197124 0 0 3 0x40014200 idle0 1 294683 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &iopl->mtx r = 0 (0xffff800000038170) #0 witness_lock+0x4c5 sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 scsi_iopool_run+0x131 scsi_ioh_pending sys/scsi/scsi_base.c:405 [inline] #3 scsi_iopool_run+0x131 sys/scsi/scsi_base.c:420 #4 scsi_xsh_runqueue+0x210 sys/scsi/scsi_base.c:596 #5 scsi_xsh_add+0xc9 sys/scsi/scsi_base.c:535 #6 sdstrategy+0x187 sys/scsi/sd.c:585 #7 spec_strategy+0x74 sys/kern/spec_vnops.c:468 #8 VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:712 #9 bwrite+0x1b9 sys/kern/vfs_bio.c:756 #10 ffs_update+0x2c2 sys/ufs/ffs/ffs_inode.c:113 #11 ufs_mkdir+0x665 sys/ufs/ufs/ufs_vnops.c:1232 #12 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 #13 domkdirat+0x121 sys/kern/vfs_syscalls.c:3051 #14 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #14 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #15 Xsyscall+0x128 Process 34430 (syz-executor.0) thread 0xffff800020e6c278 (468088) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8267b700) #0 witness_lock+0x4c5 sys/kern/subr_witness.c:1164 #1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 #2 mi_switch+0x392 sys/kern/sched_bsd.c:435 #3 sleep_finish+0x113 sys/kern/kern_synch.c:418 #4 sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] #4 sleep_finish_all+0x32 sys/kern/kern_synch.c:393 #5 tsleep+0x1cc sys/kern/kern_synch.c:155 #6 biowait+0xa6 sys/kern/vfs_bio.c:1255 #7 bwrite+0x1e4 sys/kern/vfs_bio.c:765 #8 ffs_update+0x2c2 sys/ufs/ffs/ffs_inode.c:113 #9 ufs_mkdir+0x42e sys/ufs/ufs/ufs_vnops.c:1197 #10 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 #11 domkdirat+0x121 sys/kern/vfs_syscalls.c:3051 #12 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #12 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #13 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80644f0c50) #0 witness_lock+0x4c5 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 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x13e sys/ufs/ffs/ffs_vfsops.c:1358 #5 ffs_inode_alloc+0x1cf sys/ufs/ffs/ffs_alloc.c:392 #6 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #7 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 #8 domkdirat+0x121 sys/kern/vfs_syscalls.c:3051 #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 (0xfffffd806b4451a8) #0 witness_lock+0x4c5 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:603 #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 domkdirat+0x75 sys/kern/vfs_syscalls.c:3036 #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 exclusive mutex &iopl->mtx r = 0 (0xffff800000038170) #0 witness_lock+0x4c5 sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 scsi_iopool_run+0x131 scsi_ioh_pending sys/scsi/scsi_base.c:405 [inline] #3 scsi_iopool_run+0x131 sys/scsi/scsi_base.c:420 #4 scsi_xsh_runqueue+0x210 sys/scsi/scsi_base.c:596 #5 scsi_xsh_add+0xc9 sys/scsi/scsi_base.c:535 #6 sdstrategy+0x187 sys/scsi/sd.c:585 #7 spec_strategy+0x74 sys/kern/spec_vnops.c:468 #8 VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:712 #9 bwrite+0x1b9 sys/kern/vfs_bio.c:756 #10 ffs_update+0x2c2 sys/ufs/ffs/ffs_inode.c:113 #11 ufs_mkdir+0x665 sys/ufs/ufs/ufs_vnops.c:1232 #12 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 #13 domkdirat+0x121 sys/kern/vfs_syscalls.c:3051 #14 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #14 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #15 Xsyscall+0x128 Process 71387 (softnet) thread 0xffff800020e18270 (213562) exclusive rwlock netlock r = 0 (0xffffffff82499d58) #0 witness_lock+0x4c5 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+0x4c5 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 9494 6403K 6985K 78643K 10924 0 pcb 13 8K 8K 78643K 25 0 rtable 105 3K 3K 78643K 247 0 ifaddr 59 12K 13K 78643K 86 0 counters 43 33K 34K 78643K 53 0 ioctlops 0 0K 4K 78643K 1470 0 iov 0 0K 16K 78643K 26 0 mount 1 1K 1K 78643K 1 0 vnodes 1222 77K 77K 78643K 1316 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 4 0 VM map 2 1K 1K 78643K 2 0 sem 10 0K 0K 78643K 10 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 4 9K 25K 78643K 101 0 sigio 0 0K 0K 78643K 2 0 proc 61 63K 95K 78643K 440 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 12 0 in_multi 41 2K 2K 78643K 44 0 ether_multi 1 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 31 148K 148K 78643K 31 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 91 21K 21K 78643K 1251 0 UVM aobj 7 2K 2K 78643K 7 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 8 0 NDP 9 0K 0K 78643K 18 0 temp 82 3036K 3101K 78643K 4787 0 kqueue 3 4K 8K 78643K 7 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 1 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 21 0 19 1 0 1 1 0 8 0 rtentry 112 48 0 4 2 0 2 2 0 8 0 unpcb 120 63 0 53 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 54 0 50 1 0 1 1 0 8 0 inpcb 280 138 0 131 2 0 2 2 0 8 1 nd6 48 6 0 0 1 0 1 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 27 0 0 1 0 1 1 0 8 0 pfstkey 112 27 0 0 1 0 1 1 0 8 0 pfstate 328 27 0 0 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 256 195 0 2 13 0 13 13 0 8 0 art_table 32 196 0 2 2 0 2 2 0 8 0 art_node 16 47 0 8 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 2 1 0 1 1 0 8 0 semapl 112 8 0 0 1 0 1 1 0 8 0 shmpl 112 5 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1541 0 135 46 0 46 46 0 8 0 ffsino 272 1541 0 135 95 0 95 95 0 8 0 nchpl 144 1856 0 239 61 0 61 61 0 8 1 uvmvnodes 72 1660 0 0 31 0 31 31 0 8 0 vnodes 208 1660 0 0 88 0 88 88 0 8 0 namei 1024 4831 0 4831 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 1 0 0 1 0 1 1 0 8 0 scxspl 192 5570 0 5570 7 1 6 6 0 8 6 plimitpl 152 17 0 9 1 0 1 1 0 8 0 sigapl 424 317 0 286 4 0 4 4 0 8 0 futexpl 56 1193 0 1193 1 0 1 1 0 8 1 knotepl 112 57 0 38 1 0 1 1 0 8 0 kqueuepl 144 8 0 6 1 0 1 1 0 8 0 pipelkpl 48 102 0 92 1 0 1 1 0 8 0 pipepl 120 204 0 185 1 0 1 1 0 8 0 fdescpl 496 301 0 286 3 0 3 3 0 8 0 filepl 152 1611 0 1511 5 0 5 5 0 8 1 lockfpl 104 31 0 30 1 0 1 1 0 8 0 lockfspl 48 14 0 13 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 87 0 78 1 0 1 1 0 8 0 zombiepl 144 286 0 285 1 0 1 1 0 8 0 processpl 984 317 0 285 5 0 5 5 0 8 0 procpl 624 498 0 457 4 0 4 4 0 8 0 sosppl 128 8 0 8 1 0 1 1 0 8 1 sockpl 400 223 0 204 3 0 3 3 0 8 1 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 163 0 0 20 0 20 20 0 8 0 mtagpl 80 40 0 0 1 0 1 1 0 8 0 mbufpl 256 175 0 0 11 0 11 11 0 8 0 bufpl 280 4243 0 174 291 0 291 291 0 8 0 anonpl 16 41147 0 27234 59 1 58 58 0 124 0 amapchunkpl 152 1408 0 1282 7 0 7 7 0 158 0 amappl16 192 1144 0 399 39 0 39 39 0 8 1 amappl15 184 78 0 76 2 1 1 1 0 8 0 amappl14 176 1 0 1 1 1 0 1 0 8 0 amappl13 168 30 0 28 1 0 1 1 0 8 0 amappl12 160 39 0 36 1 0 1 1 0 8 0 amappl11 152 84 0 64 2 0 2 2 0 8 1 amappl10 144 20 0 14 1 0 1 1 0 8 0 amappl9 136 381 0 378 1 0 1 1 0 8 0 amappl8 128 301 0 288 1 0 1 1 0 8 0 amappl7 120 120 0 108 1 0 1 1 0 8 0 amappl6 112 27 0 20 1 0 1 1 0 8 0 amappl5 104 248 0 233 1 0 1 1 0 8 0 amappl4 96 500 0 472 1 0 1 1 0 8 0 amappl3 88 112 0 105 1 0 1 1 0 8 0 amappl2 80 1528 0 1466 3 1 2 3 0 8 0 amappl1 72 16618 0 16185 26 13 13 20 0 8 3 amappl 80 753 0 713 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 6 0 0 1 0 1 1 0 8 0 uaddrrnd 24 302 0 286 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 302 0 286 1 0 1 1 0 8 0 vmmpekpl 168 6357 0 6324 2 0 2 2 0 8 0 vmmpepl 168 43458 0 41683 107 6 101 101 0 357 18 vmsppl 368 301 0 286 2 0 2 2 0 8 0 pdppl 4096 612 0 573 6 0 6 6 0 8 0 pvpl 32 144243 0 127278 146 0 146 146 0 265 7 pmappl 232 301 0 286 2 0 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 167 0 3 5 0 5 5 0 8 0