login: panic: poolWA_RcNacINhGe_: itSPemL_ NmOaTg iLc_OWcEhReEcDk : ONm buSYfSpClA LcL pu10 fr-2ee4 60li00st EmXoIdTi f0ie 9d : Stopped at savectx+0xb1: movl $0,%gs:0x530 TID PID UID PRFLAGS PFLAGS CPU COMMAND 313248 75914 0 0 0x4000000 1 syz-executor.1 * 11365 26381 0 0x2 0 0 syz-executor.0 savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffc43c0, 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 0xfffffd806f2ada00+16 0x0!=0xd3dee1ff8ffdbd0e ddb{0}> trace savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffc43c0, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800020b6bdc0 rbx 0 rdx 0xffff800020a6c278 rcx 0 rax 0x38 r8 0xffffffff8113457f kprintf+0x16f r9 0x1 r10 0x25 r11 0x22534d7085712554 r12 0 r13 0 r14 0xffff800020a6c278 r15 0 rip 0xffffffff8114c3f1 savectx+0xb1 cs 0x8 rflags 0x46 rsp 0xffff800020b6bd40 ss 0x10 savectx+0xb1: movl $0,%gs:0x530 ddb{0}> show proc PROC (syz-executor.0) pid=11365 stat=onproc flags process=2 proc=0 pri=32, usrpri=63, nice=20 forw=0xffffffffffffffff, list=0xffff800020a6c008,0xffff800020ac7d68 process=0xffff800020a812d0 user=0xffff800020b66000, vmspace=0xfffffd807efff8a0 estcpu=36, cpticks=1, pctcpu=0.11 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 75914 239533 96640 0 2 0 syz-executor.1 75914 313248 96640 0 7 0x4000000 syz-executor.1 97359 455774 0 0 3 0x14200 bored sosplice 96640 478654 41498 0 3 0x82 nanosleep syz-executor.1 *26381 11365 41498 0 7 0x2 syz-executor.0 41498 357742 19787 0 3 0x82 thrsleep syz-fuzzer 41498 220833 19787 0 3 0x4000082 nanosleep syz-fuzzer 41498 265850 19787 0 3 0x4000082 thrsleep syz-fuzzer 41498 419000 19787 0 3 0x4000082 thrsleep syz-fuzzer 41498 269078 19787 0 3 0x4000082 nanosleep syz-fuzzer 41498 111248 19787 0 3 0x4000082 thrsleep syz-fuzzer 41498 201505 19787 0 3 0x4000082 thrsleep syz-fuzzer 41498 418360 19787 0 3 0x4000082 thrsleep syz-fuzzer 41498 227546 19787 0 3 0x4000082 thrsleep syz-fuzzer 41498 515509 19787 0 2 0x4000082 syz-fuzzer 19787 133558 34993 0 3 0x10008a pause ksh 34993 365321 61928 0 3 0x92 select sshd 80035 383886 1 0 3 0x100083 ttyin getty 61928 522494 1 0 3 0x80 select sshd 4093 435170 92849 74 3 0x100092 bpf pflogd 92849 284422 1 0 3 0x80 netio pflogd 50529 489415 1653 73 3 0x100090 kqread syslogd 1653 26511 1 0 3 0x100082 netio syslogd 91131 95230 1 77 3 0x100090 poll dhclient 56531 75902 1 0 3 0x80 poll dhclient 97815 327862 0 0 3 0x14200 bored smr 91337 333798 0 0 2 0x14200 zerothread 93 114900 0 0 3 0x14200 aiodoned aiodoned 67695 166621 0 0 3 0x14200 syncer update 42361 8268 0 0 3 0x14200 cleaner cleaner 50453 264856 0 0 3 0x14200 reaper reaper 16783 19745 0 0 3 0x14200 pgdaemon pagedaemon 79196 235130 0 0 3 0x14200 bored crynlk 21229 135883 0 0 3 0x14200 bored crypto 57947 152453 0 0 3 0x40014200 acpi0 acpi0 60719 478022 0 0 3 0x40014200 idle1 531 259164 0 0 2 0x14200 softnet 74900 110875 0 0 3 0x14200 bored systqmp 67128 502024 0 0 3 0x14200 bored systq 31747 249899 0 0 3 0x40014200 bored softclock 12942 291195 0 0 3 0x40014200 idle0 1 82705 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &bq->bufq_mtx r = 0 (0xffff80000017ad68) #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 bufq_queue+0x28 sys/kern/kern_bufq.c:182 #4 sdstrategy+0x178 sys/scsi/sd.c:585 #5 spec_strategy+0x74 sys/kern/spec_vnops.c:468 #6 ufs_strategy+0x17c #7 VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:711 #8 bwrite+0x1b9 sys/kern/vfs_bio.c:756 #9 ufs_dirremove+0x291 #10 ufs_remove+0x154 sys/ufs/ufs/ufs_vnops.c:611 #11 VOP_REMOVE+0x11f sys/kern/vfs_vops.c:378 #12 dounlinkat+0x195 sys/kern/vfs_syscalls.c:1896 #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 Process 75914 (syz-executor.1) thread 0xffff800020ac6c48 (313248) exclusive rwlock netlock r = 0 (0xffffffff82531638) #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 sendit+0x52b sys/kern/uipc_syscalls.c:657 #4 sys_sendto+0x80 sys/kern/uipc_syscalls.c:522 #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 Process 26381 (syz-executor.0) thread 0xffff800020a6c278 (11365) exclusive rrwlock inode r = 0 (0xfffffd80638541b0) #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 (0xfffffd8063854f80) #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 cache_lookup+0x2bb sys/kern/vfs_cache.c:224 #7 ufs_lookup+0x1bc sys/ufs/ufs/ufs_lookup.c:162 #8 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:90 #9 vfs_lookup+0x7a6 sys/kern/vfs_lookup.c:568 #10 namei+0x63c sys/kern/vfs_lookup.c:249 #11 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1860 #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 kernel_lock &kernel_lock r = 0 (0xffffffff82685300) #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 &bq->bufq_mtx r = 0 (0xffff80000017ad68) #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 bufq_queue+0x28 sys/kern/kern_bufq.c:182 #4 sdstrategy+0x178 sys/scsi/sd.c:585 #5 spec_strategy+0x74 sys/kern/spec_vnops.c:468 #6 ufs_strategy+0x17c #7 VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:711 #8 bwrite+0x1b9 sys/kern/vfs_bio.c:756 #9 ufs_dirremove+0x291 #10 ufs_remove+0x154 sys/ufs/ufs/ufs_vnops.c:611 #11 VOP_REMOVE+0x11f sys/kern/vfs_vops.c:378 #12 dounlinkat+0x195 sys/kern/vfs_syscalls.c:1896 #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9485 6402K 6601K 78643K 10701 0 pcb 13 8K 8K 78643K 41 0 rtable 105 3K 3K 78643K 208 0 ifaddr 49 11K 11K 78643K 60 0 counters 43 33K 34K 78643K 45 0 ioctlops 0 0K 4K 78643K 1473 0 iov 0 0K 12K 78643K 57 0 mount 1 1K 1K 78643K 1 0 vnodes 1221 77K 77K 78643K 1263 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 3 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 34 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 5 13K 25K 78643K 96 0 sigio 0 0K 0K 78643K 4 0 proc 60 63K 95K 78643K 444 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 14 0 in_multi 33 2K 2K 78643K 43 0 ether_multi 1 0K 0K 78643K 3 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 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 110 38K 47K 78643K 1242 0 UVM aobj 20 2K 2K 78643K 20 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 10 0 NDP 7 0K 0K 78643K 12 0 temp 81 3018K 3097K 78643K 2607 0 kqueue 3 4K 4K 78643K 3 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 0 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 45 0 1 2 0 2 2 0 8 0 unpcb 120 152 0 140 1 0 1 1 0 8 0 syncache 264 6 0 6 2 1 1 1 0 8 1 tcpqe 32 603 0 603 1 0 1 1 0 8 1 tcpcb 544 40 0 36 1 0 1 1 0 8 0 inpcb 280 140 0 132 1 0 1 1 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 pffrag 232 3 0 2 1 0 1 1 0 482 0 pffrnode 88 3 0 2 1 0 1 1 0 8 0 pffrent 40 68 0 47 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 22 0 1 1 0 1 1 0 8 0 pfstkey 112 22 0 1 1 0 1 1 0 8 0 pfstate 328 22 0 0 2 0 2 2 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 256 188 0 0 12 0 12 12 0 8 0 art_table 32 189 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 22 0 12 1 0 1 1 0 8 0 semupl 112 9 0 9 1 0 1 1 0 8 1 semapl 112 28 0 18 1 0 1 1 0 8 0 shmpl 112 18 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1516 0 106 46 0 46 46 0 8 0 ffsino 272 1516 0 106 95 0 95 95 0 8 0 nchpl 144 1877 0 258 61 0 61 61 0 8 0 uvmvnodes 72 1590 0 0 29 0 29 29 0 8 0 vnodes 208 1590 0 0 84 0 84 84 0 8 0 namei 1024 4936 0 4936 1 0 1 1 0 8 1 percpumem 16 33 0 1 1 0 1 1 0 8 0 vcpupl 1984 2 0 0 1 0 1 1 0 8 0 vmpool 560 2 0 0 1 0 1 1 0 8 0 scxspl 192 5900 0 5900 8 1 7 7 0 8 7 plimitpl 152 25 0 17 1 0 1 1 0 8 0 sigapl 424 312 0 280 4 0 4 4 0 8 0 futexpl 56 1662 0 1662 1 0 1 1 0 8 1 knotepl 112 53 0 34 1 0 1 1 0 8 0 kqueuepl 144 9 0 7 1 0 1 1 0 8 0 pipelkpl 48 93 0 83 1 0 1 1 0 8 0 pipepl 120 186 0 167 1 0 1 1 0 8 0 fdescpl 496 296 0 280 3 0 3 3 0 8 0 filepl 152 1813 0 1710 6 0 6 6 0 8 2 lockfpl 104 52 0 51 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 96 163 0 154 1 0 1 1 0 8 0 zombiepl 144 280 0 280 1 0 1 1 0 8 1 processpl 960 312 0 280 5 0 5 5 0 8 0 procpl 624 476 0 434 4 0 4 4 0 8 0 sosppl 128 3 0 3 1 0 1 1 0 8 1 sockpl 400 313 0 291 4 0 4 4 0 8 1 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 199 0 0 24 0 24 24 0 8 0 mtagpl 80 7 0 0 1 0 1 1 0 8 0 mbufpl 256 265 0 0 17 0 17 17 0 8 0 bufpl 280 4515 0 174 311 0 311 311 0 8 0 anonpl 16 46252 0 29847 76 1 75 75 0 124 7 amapchunkpl 152 1583 0 1444 11 0 11 11 0 158 4 amappl16 192 1355 0 462 46 0 46 46 0 8 1 amappl15 184 1 0 1 1 1 0 1 0 8 0 amappl14 176 69 0 65 2 1 1 1 0 8 0 amappl13 168 26 0 24 1 0 1 1 0 8 0 amappl12 160 9 0 8 2 1 1 1 0 8 0 amappl11 152 72 0 54 1 0 1 1 0 8 0 amappl10 144 23 0 18 1 0 1 1 0 8 0 amappl9 136 390 0 386 1 0 1 1 0 8 0 amappl8 128 322 0 296 1 0 1 1 0 8 0 amappl7 120 120 0 109 1 0 1 1 0 8 0 amappl6 112 27 0 22 1 0 1 1 0 8 0 amappl5 104 202 0 186 1 0 1 1 0 8 0 amappl4 96 501 0 469 2 1 1 2 0 8 0 amappl3 88 109 0 104 1 0 1 1 0 8 0 amappl2 80 1448 0 1379 3 1 2 3 0 8 0 amappl1 72 16531 0 16082 26 14 12 20 0 8 2 amappl 80 730 0 684 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 19 0 0 1 0 1 1 0 8 0 uaddrrnd 24 298 0 280 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 298 0 280 1 0 1 1 0 8 0 vmmpekpl 168 6310 0 6280 2 0 2 2 0 8 0 vmmpepl 168 43447 0 41408 123 7 116 116 0 357 26 vmsppl 368 297 0 280 2 0 2 2 0 8 0 pdppl 4096 604 0 562 6 0 6 6 0 8 0 pvpl 32 153434 0 133921 180 0 180 180 0 265 18 pmappl 232 297 0 280 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 178 0 3 5 0 5 5 0 8 0