"*"*load: 1.10 cmd: panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd80627ef000+16 0x0!=0x93df2550720979d4 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *107901 10377 0 0x2 0x4000000 0 syz-fuzzer 188336 64742 0 0x14000 0x200 1 softnet db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8240e744) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff828d47c8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828d47c8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828d47c8,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_clget(0,2,800) at m_clget+0x1c9 m_gethdr sys/kern/uipc_mbuf.c:283 [inline] m_clget(0,2,800) at m_clget+0x1c9 sys/kern/uipc_mbuf.c:400 vio_populate_rx_mbufs(ffff80000017c000) at vio_populate_rx_mbufs+0xf9 vio_add_rx_mbuf sys/dev/pv/if_vio.c:908 [inline] vio_populate_rx_mbufs(ffff80000017c000) at vio_populate_rx_mbufs+0xf9 sys/dev/pv/if_vio.c:951 vio_rx_intr(ffff80000017c050) at vio_rx_intr+0x69 intr_handler(ffff800020eaa600,ffff800000256b80) at intr_handler+0x8f sys/arch/amd64/amd64/intr.c:536 Xintr_ioapic_edge19_untramp() at Xintr_ioapic_edge19_untramp+0x19f end of kernel end trace frame: 0xc002c0cb40, count: 6 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 0xfffffd80627ef000+16 0x0!=0x93df2550720979d4 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8240e744) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff828d47c8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828d47c8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828d47c8,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_clget(0,2,800) at m_clget+0x1c9 m_gethdr sys/kern/uipc_mbuf.c:283 [inline] m_clget(0,2,800) at m_clget+0x1c9 sys/kern/uipc_mbuf.c:400 vio_populate_rx_mbufs(ffff80000017c000) at vio_populate_rx_mbufs+0xf9 vio_add_rx_mbuf sys/dev/pv/if_vio.c:908 [inline] vio_populate_rx_mbufs(ffff80000017c000) at vio_populate_rx_mbufs+0xf9 sys/dev/pv/if_vio.c:951 vio_rx_intr(ffff80000017c050) at vio_rx_intr+0x69 intr_handler(ffff800020eaa600,ffff800000256b80) at intr_handler+0x8f sys/arch/amd64/amd64/intr.c:536 Xintr_ioapic_edge19_untramp() at Xintr_ioapic_edge19_untramp+0x19f end of kernel end trace frame: 0xc002c0cb40, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020eaa280 rbx 0xffff800020eaa330 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffff800020eaa240 r9 0xffffffff8167b47f kprintf+0x16f r10 0x1 r11 0x6e303a86e409b060 r12 0x3000000008 r13 0xffff800020eaa290 r14 0x100 r15 0x1 rip 0xffffffff8215e708 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020eaa270 ss 0 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-fuzzer) pid=107901 stat=onproc flags process=2 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020dd64f8,0xffff800020dd6780 process=0xffff8000ffffd3b0 user=0xffff800020ea5000, vmspace=0xfffffd806e8f92e8 estcpu=36, cpticks=61, pctcpu=4.26 user=0, sys=0, intr=1 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 87719 195206 0 0 3 0x14280 nfsidl nfsio 79303 174429 0 0 3 0x14280 nfsidl nfsio 30806 510111 0 0 3 0x14280 nfsidl nfsio 7053 244933 0 0 3 0x14280 nfsidl nfsio 75604 303471 0 0 3 0x14280 nfsidl nfsio 77836 439705 0 0 3 0x14280 nfsidl nfsio 48217 391124 0 0 3 0x14280 nfsidl nfsio 41912 285912 0 0 3 0x14280 nfsidl nfsio 25899 4728 0 0 3 0x14280 nfsidl nfsio 98492 290507 0 0 3 0x14280 nfsidl nfsio 14340 248029 0 0 3 0x14280 nfsidl nfsio 74738 448390 0 0 3 0x14280 nfsidl nfsio 27723 511041 0 0 3 0x14280 nfsidl nfsio 19040 384346 0 0 3 0x14280 nfsidl nfsio 20542 217251 0 0 3 0x14280 nfsidl nfsio 34135 57429 0 0 3 0x14280 nfsidl nfsio 1065 310684 0 0 3 0x14280 nfsidl nfsio 33078 307388 0 0 3 0x14280 nfsidl nfsio 75753 397497 0 0 3 0x14280 nfsidl nfsio 60792 498070 0 0 3 0x14280 nfsidl nfsio 44865 442206 10377 0 3 0x2 biowait syz-executor.1 38725 122605 0 0 3 0x14200 bored sosplice 30112 126226 10377 0 3 0x82 piperd syz-executor.0 10377 97163 53470 0 3 0x82 thrsleep syz-fuzzer 10377 34103 53470 0 3 0x4000082 nanosleep syz-fuzzer 10377 82209 53470 0 3 0x4000082 thrsleep syz-fuzzer 10377 338020 53470 0 3 0x4000082 thrsleep syz-fuzzer 10377 317907 53470 0 3 0x4000082 thrsleep syz-fuzzer 10377 87991 53470 0 3 0x4000082 kqread syz-fuzzer 10377 223102 53470 0 3 0x4000082 thrsleep syz-fuzzer *10377 107901 53470 0 7 0x4000002 syz-fuzzer 53470 469872 20419 0 3 0x10008a pause ksh 20419 500284 76862 0 3 0x92 select sshd 39731 75758 1 0 3 0x100083 ttyin getty 76862 248624 1 0 3 0x80 select sshd 58464 91552 98763 74 3 0x100092 bpf pflogd 98763 470281 1 0 3 0x80 netio pflogd 6236 133612 76874 73 3 0x100090 kqread syslogd 76874 294081 1 0 3 0x100082 netio syslogd 24752 203491 1 77 3 0x100090 poll dhclient 22193 229318 1 0 3 0x80 poll dhclient 94032 426728 0 0 3 0x14200 bored smr 93362 452767 0 0 3 0x14200 pgzero zerothread 30033 297715 0 0 3 0x14200 aiodoned aiodoned 95541 105288 0 0 3 0x14200 syncer update 36977 459784 0 0 3 0x14200 cleaner cleaner 57425 105437 0 0 3 0x14200 reaper reaper 84272 130680 0 0 3 0x14200 pgdaemon pagedaemon 77734 142965 0 0 3 0x14200 bored crynlk 67749 474104 0 0 3 0x14200 bored crypto 37381 370351 0 0 3 0x40014200 acpi0 acpi0 4668 492893 0 0 3 0x40014200 idle1 64742 188336 0 0 7 0x14200 softnet 92606 477765 0 0 3 0x14200 bored systqmp 69641 71507 0 0 3 0x14200 bored systq 73187 445611 0 0 3 0x40014200 bored softclock 74343 265166 0 0 3 0x40014200 idle0 1 225898 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 44865 (syz-executor.1) thread 0xffff800020e918c8 (442206) exclusive rrwlock inode r = 0 (0xfffffd806ecee3c8) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 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 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:1853 #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 (0xfffffd806b0ed918) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 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 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1853 #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 10377 (syz-fuzzer) thread 0xffff800020dd78b8 (107901) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8293cf68) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 #2 Xintr_ioapic_edge19_untramp+0x19f ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9529 6450K 7064K 78643K 12250 0 pcb 13 8K 8K 78643K 183 0 rtable 113 16K 19K 78643K 679 0 ifaddr 95 19K 19K 78643K 252 0 sysctl 2 0K 0K 78643K 2 0 counters 43 33K 34K 78643K 75 0 ioctlops 0 0K 8K 78643K 1686 0 iov 0 0K 16K 78643K 117 0 mount 1 1K 1K 78643K 1 0 vnodes 1216 76K 77K 78643K 1790 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 17 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 319 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 4 9K 25K 78643K 1401 0 sigio 0 0K 0K 78643K 6 0 proc 63 63K 83K 78643K 570 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 93 0 in_multi 91 4K 4K 78643K 252 0 ether_multi 1 0K 0K 78643K 27 0 mrt 1 0K 0K 78643K 11 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 310 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 188 109K 109K 78643K 5382 0 UVM aobj 38 7K 7K 78643K 42 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 1K 78643K 146 0 NDP 13 0K 0K 78643K 47 0 temp 145 3884K 3948K 78643K 18527 0 kqueue 3 4K 8K 78643K 29 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 3 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 88 63 0 61 1 0 1 1 0 8 0 rtentry 112 107 0 73 2 0 2 2 0 8 0 unpcb 120 510 0 500 1 0 1 1 0 8 0 syncache 272 9 0 9 5 5 0 1 0 8 0 tcpqe 32 151 0 151 2 2 0 1 0 8 0 tcpcb 592 454 0 450 5 3 2 2 0 8 1 inpcb 296 1245 0 1238 5 3 2 2 0 8 1 rttmr 72 6 0 6 3 2 1 1 0 8 1 nd6 48 35 0 30 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 ppxss 1136 2 0 2 1 1 0 1 0 8 0 pfstscr 40 8 0 8 2 2 0 1 0 8 0 pffrag 232 9 0 9 2 1 1 1 0 482 1 pffrnode 88 9 0 9 2 1 1 1 0 8 1 pffrent 40 67 0 67 2 1 1 1 0 8 1 pfosfp 40 847 0 423 5 0 5 5 0 8 0 pfosfpen 112 1430 0 714 21 0 21 21 0 8 0 pfrke_plain 160 31 0 27 2 1 1 1 0 8 0 pfrktable 1344 76 0 68 3 2 1 2 0 8 0 pfstitem 24 17 0 15 1 0 1 1 0 8 0 pfstkey 112 23 0 21 1 0 1 1 0 8 0 pfstate 328 18 0 16 2 1 1 2 0 8 0 pfrule 1360 47 0 36 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 543 0 354 16 3 13 15 0 8 0 art_table 32 545 0 354 2 0 2 2 0 8 0 art_node 16 106 0 78 1 0 1 1 0 8 0 sysvmsgpl 40 51 0 34 2 1 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 317 0 307 1 0 1 1 0 8 0 shmpl 112 39 0 4 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3173 0 1774 88 0 88 88 0 8 0 ffsino 272 3173 0 1774 94 0 94 94 0 8 0 nchpl 144 6308 0 4714 60 0 60 60 0 8 0 uvmvnodes 72 3636 0 0 67 0 67 67 0 8 0 vnodes 208 3636 0 0 192 0 192 192 0 8 0 namei 1024 16650 0 16650 3 2 1 1 0 8 1 percpumem 16 48 0 16 1 0 1 1 0 8 0 vcpupl 1984 9 0 0 2 0 2 2 0 8 0 vmpool 560 14 0 5 2 1 1 1 0 8 0 pfiaddrpl 120 27 0 21 3 2 1 1 0 8 0 scxspl 200 16593 0 16592 19 16 3 7 0 8 2 plimitpl 152 110 0 102 1 0 1 1 0 8 0 sigapl 424 1634 0 1583 6 0 6 6 0 8 0 futexpl 56 19538 0 19538 2 1 1 1 0 8 1 knotepl 112 107 0 87 1 0 1 1 0 8 0 kqueuepl 152 136 0 132 1 0 1 1 0 8 0 pipepl 304 285 0 274 4 2 2 2 0 8 1 fdescpl 496 1598 0 1583 3 0 3 3 0 8 0 filepl 152 9637 0 9535 8 3 5 6 0 8 1 lockfpl 104 240 0 239 1 0 1 1 0 8 0 lockfspl 48 80 0 79 1 0 1 1 0 8 0 sessionpl 120 19 0 8 1 0 1 1 0 8 0 pgrppl 48 42 0 31 1 0 1 1 0 8 0 ucredpl 96 898 0 889 1 0 1 1 0 8 0 zombiepl 144 1583 0 1583 1 0 1 1 0 8 1 processpl 1008 1634 0 1583 7 0 7 7 0 8 0 procpl 632 4467 0 4409 8 2 6 6 0 8 1 srpgc 72 4 0 4 2 2 0 1 0 8 0 sosppl 144 8 0 8 3 3 0 1 0 8 0 sockpl 400 1821 0 1802 8 4 4 4 0 8 2 mcl64k 65536 523 0 0 66 0 66 66 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 7 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 16 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 188 0 0 23 1 22 23 0 8 0 mtagpl 96 59 0 0 2 0 2 2 0 8 0 mbufpl 256 709 0 0 41 0 41 41 0 8 0 bufpl 280 6221 0 150 434 0 434 434 0 8 0 anonpl 16 166965 0 148479 114 23 91 91 0 124 14 amapchunkpl 152 9679 0 9345 29 13 16 27 0 158 1 amappl16 192 8176 0 7312 74 22 52 56 0 8 8 amappl15 184 5 0 3 1 0 1 1 0 8 0 amappl14 176 2 0 1 1 0 1 1 0 8 0 amappl13 168 541 0 537 1 0 1 1 0 8 0 amappl12 160 28 0 25 1 0 1 1 0 8 0 amappl11 152 260 0 245 1 0 1 1 0 8 0 amappl10 144 23 0 20 1 0 1 1 0 8 0 amappl9 136 365 0 364 1 0 1 1 0 8 0 amappl8 128 394 0 349 2 0 2 2 0 8 0 amappl7 120 133 0 119 1 0 1 1 0 8 0 amappl6 112 234 0 227 1 0 1 1 0 8 0 amappl5 104 1512 0 1497 1 0 1 1 0 8 0 amappl4 96 1025 0 994 1 0 1 1 0 8 0 amappl3 88 189 0 181 1 0 1 1 0 8 0 amappl2 80 11861 0 11800 2 0 2 2 0 8 0 amappl1 72 55992 0 55563 23 13 10 18 0 8 0 amappl 80 4778 0 4690 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 41 0 4 1 0 1 1 0 8 0 uaddrrnd 24 1612 0 1588 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1612 0 1588 1 0 1 1 0 8 0 vmmpekpl 168 15670 0 15630 2 0 2 2 0 8 0 vmmpepl 168 211104 0 209116 158 56 102 126 0 357 4 vmsppl 368 1611 0 1588 3 0 3 3 0 8 0 pdppl 4096 3231 0 3185 7 0 7 7 0 8 0 pvpl 32 505006 0 483312 257 44 213 214 0 265 32 pmappl 232 1611 0 1588 4 2 2 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 367 0 18 10 0 10 10 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8240e744) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff828d47c8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828d47c8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828d47c8,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_clget(0,2,800) at m_clget+0x1c9 m_gethdr sys/kern/uipc_mbuf.c:283 [inline] m_clget(0,2,800) at m_clget+0x1c9 sys/kern/uipc_mbuf.c:400 vio_populate_rx_mbufs(ffff80000017c000) at vio_populate_rx_mbufs+0xf9 vio_add_rx_mbuf sys/dev/pv/if_vio.c:908 [inline] vio_populate_rx_mbufs(ffff80000017c000) at vio_populate_rx_mbufs+0xf9 sys/dev/pv/if_vio.c:951 vio_rx_intr(ffff80000017c050) at vio_rx_intr+0x69 intr_handler(ffff800020eaa600,ffff800000256b80) at intr_handler+0x8f sys/arch/amd64/amd64/intr.c:536 Xintr_ioapic_edge19_untramp() at Xintr_ioapic_edge19_untramp+0x19f end of kernel end trace frame: 0xc002c0cb40, count: -9 ddb{0}> machine ddbcpu 1