login: panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd8079ba7600+24 0x8bac9bb0033a435a!=0x745366306c5b9d5a Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 313416 45030 0 0x2 0x4000000 1 syz-execprog *176573 37857 0 0x14000 0x40000200 0K softclock db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823fbb26) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff828bfde0) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828bfde0) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828bfde0,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,1) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 rtm_msg1(14,ffff800020d976f8) at rtm_msg1+0x6e sys/net/rtsock.c:1534 rtm_addr(14,ffff800000aa2b00) at rtm_addr+0x9b sys/net/rtsock.c:1740 nd6_dad_timer(ffff800000aa2b00) at nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 timeout_run(ffff800000af5e30) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffff800000af5e30) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020d89380) at softclock_thread+0x16a sys/kern/kern_timeout.c:580 end trace frame: 0x0, count: 5 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 0xfffffd8079ba7600+24 0x8bac9bb0033a435a!=0x745366306c5b9d5a ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823fbb26) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff828bfde0) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828bfde0) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828bfde0,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,1) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 rtm_msg1(14,ffff800020d976f8) at rtm_msg1+0x6e sys/net/rtsock.c:1534 rtm_addr(14,ffff800000aa2b00) at rtm_addr+0x9b sys/net/rtsock.c:1740 nd6_dad_timer(ffff800000aa2b00) at nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 timeout_run(ffff800000af5e30) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffff800000af5e30) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020d89380) at softclock_thread+0x16a sys/kern/kern_timeout.c:580 end trace frame: 0x0, count: -10 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020d97460 rbx 0xffff800020d97510 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff8121f16f kprintf+0x16f r9 0x1 r10 0x2 r11 0xd6f777cbc4b23c3a r12 0x3000000008 r13 0xffff800020d97470 r14 0x100 r15 0x1 rip 0xffffffff81b076f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020d97450 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (softclock) pid=176573 stat=onproc flags process=14000 proc=40000200 pri=0, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020d895f0,0xffff800020d89120 process=0xffff800020d8a3d8 user=0xffff800020d92000, vmspace=0xffffffff828f4038 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 10838 262400 45030 0 2 0x482 syz-executor.1 85311 154570 45030 0 3 0x82 nanosleep syz-executor.0 45030 215832 52229 0 3 0x82 kqread syz-execprog 45030 313416 52229 0 7 0x4000002 syz-execprog 45030 292172 52229 0 3 0x4000082 thrsleep syz-execprog 45030 356963 52229 0 3 0x4000082 thrsleep syz-execprog 45030 149276 52229 0 3 0x4000082 thrsleep syz-execprog 45030 344764 52229 0 3 0x4000082 thrsleep syz-execprog 45030 33746 52229 0 3 0x4000082 thrsleep syz-execprog 45030 293049 52229 0 3 0x4000082 thrsleep syz-execprog 45030 259489 52229 0 3 0x4000082 nanosleep syz-execprog 52229 97166 23503 0 3 0x10008a pause ksh 23503 46365 69834 0 3 0x92 select sshd 85151 78822 1 0 3 0x100083 ttyin getty 69834 29749 1 0 3 0x80 select sshd 40012 372675 16928 74 3 0x100092 bpf pflogd 16928 330613 1 0 3 0x80 netio pflogd 76507 142959 48106 73 3 0x100090 kqread syslogd 48106 503080 1 0 3 0x100082 netio syslogd 15331 451229 1 77 3 0x100090 poll dhclient 39915 405482 1 0 3 0x80 poll dhclient 64017 30579 0 0 3 0x14200 bored smr 26595 162196 0 0 3 0x14200 pgzero zerothread 85130 227763 0 0 3 0x14200 aiodoned aiodoned 17563 138727 0 0 3 0x14200 syncer update 7485 304816 0 0 3 0x14200 cleaner cleaner 69802 314812 0 0 3 0x14200 reaper reaper 55178 188232 0 0 3 0x14200 pgdaemon pagedaemon 44962 474583 0 0 3 0x14200 bored crynlk 83122 53769 0 0 3 0x14200 bored crypto 78558 369634 0 0 3 0x40014200 acpi0 acpi0 39647 405344 0 0 3 0x40014200 idle1 46551 523457 0 0 3 0x14200 bored softnet 61080 334846 0 0 3 0x14200 bored systqmp 67347 473463 0 0 3 0x14200 bored systq *37857 176573 0 0 7 0x40014200 softclock 57534 342136 0 0 3 0x40014200 idle0 1 457741 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 37857 (softclock) thread 0xffff800020d89380 (176573) exclusive rwlock netlock r = 0 (0xffffffff82732c98) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 nd6_dad_timer+0x34 sys/netinet6/nd6_nbr.c:1170 #2 timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] #2 timeout_run+0xc4 sys/kern/kern_timeout.c:490 #3 softclock_thread+0x16a sys/kern/kern_timeout.c:580 #4 proc_trampoline+0x1c shared rwlock timeout r = 0 (0xffffffff82756010) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 timeout_run+0xb9 sys/kern/kern_timeout.c:489 #2 softclock_thread+0x16a sys/kern/kern_timeout.c:580 #3 proc_trampoline+0x1c exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828ac7e0) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 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 softclock_thread+0x103 sys/kern/kern_timeout.c:575 #5 proc_trampoline+0x1c ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9471 6398K 6398K 78643K 10564 0 pcb 13 8K 8K 78643K 13 0 rtable 105 3K 3K 78643K 199 0 ifaddr 44 10K 10K 78643K 129 0 counters 43 33K 33K 78643K 43 0 ioctlops 0 0K 4K 78643K 1469 0 iov 0 0K 0K 78643K 84 0 mount 1 1K 1K 78643K 1 0 vnodes 1183 74K 75K 78643K 1188 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 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 3 8K 24K 78643K 117 0 proc 59 63K 83K 78643K 438 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 33 2K 2K 78643K 33 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 19 95K 95K 78643K 19 0 exec 0 0K 1K 78643K 210 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 80 20K 21K 78643K 1091 0 UVM aobj 2 2K 2K 78643K 2 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 7 0K 0K 78643K 10 0 temp 33 3853K 3917K 78643K 2134 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 19 0 17 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 29 0 19 1 0 1 1 0 8 0 syncache 264 5 0 5 2 1 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 296 121 0 115 1 0 1 1 0 8 0 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 11 0 2 1 0 1 1 0 8 0 pfstkey 112 11 0 2 1 0 1 1 0 8 0 pfstate 328 11 0 2 1 0 1 1 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 256 189 0 0 12 0 12 12 0 8 0 art_table 32 190 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1511 0 104 88 0 88 88 0 8 0 ffsino 272 1511 0 104 94 0 94 94 0 8 0 nchpl 144 1815 0 204 60 0 60 60 0 8 0 uvmvnodes 72 1521 0 0 28 0 28 28 0 8 0 vnodes 208 1521 0 0 81 0 81 81 0 8 0 namei 1024 4683 0 4683 2 1 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 scxspl 192 5125 0 5125 9 8 1 7 0 8 1 plimitpl 152 16 0 8 1 0 1 1 0 8 0 sigapl 424 337 0 307 4 0 4 4 0 8 0 knotepl 112 59 0 42 1 0 1 1 0 8 0 kqueuepl 144 2 0 0 1 0 1 1 0 8 0 pipelkpl 48 81 0 71 2 1 1 1 0 8 0 pipepl 120 162 0 143 2 1 1 1 0 8 0 fdescpl 496 322 0 307 3 0 3 3 0 8 0 filepl 152 1311 0 1244 3 0 3 3 0 8 0 lockfpl 104 5 0 4 1 0 1 1 0 8 0 lockfspl 48 3 0 2 1 0 1 1 0 8 0 sessionpl 112 20 0 9 1 0 1 1 0 8 0 pgrppl 48 20 0 9 1 0 1 1 0 8 0 ucredpl 96 62 0 53 1 0 1 1 0 8 0 zombiepl 144 307 0 305 2 1 1 1 0 8 0 processpl 984 337 0 305 5 0 5 5 0 8 0 procpl 624 345 0 305 4 0 4 4 0 8 0 sockpl 400 169 0 151 3 0 3 3 0 8 1 mcl4k 4096 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 70 0 0 9 0 9 9 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 137 0 0 8 0 8 8 0 8 0 bufpl 280 3141 0 133 215 0 215 215 0 8 0 anonpl 16 25285 0 23540 14 2 12 12 0 124 4 amapchunkpl 152 1125 0 1056 6 0 6 6 0 158 2 amappl16 192 500 0 455 3 0 3 3 0 8 0 amappl15 184 9 0 7 1 0 1 1 0 8 0 amappl14 176 32 0 28 1 0 1 1 0 8 0 amappl13 168 31 0 27 2 1 1 1 0 8 0 amappl12 160 56 0 54 2 1 1 1 0 8 0 amappl11 152 62 0 46 1 0 1 1 0 8 0 amappl10 144 18 0 15 1 0 1 1 0 8 0 amappl9 136 276 0 273 1 0 1 1 0 8 0 amappl8 128 339 0 329 1 0 1 1 0 8 0 amappl7 120 121 0 110 1 0 1 1 0 8 0 amappl6 112 28 0 23 1 0 1 1 0 8 0 amappl5 104 261 0 247 1 0 1 1 0 8 0 amappl4 96 509 0 480 1 0 1 1 0 8 0 amappl3 88 106 0 100 1 0 1 1 0 8 0 amappl2 80 1108 0 1048 3 1 2 2 0 8 0 amappl1 72 16244 0 15824 23 5 18 18 0 8 8 amappl 80 591 0 560 1 0 1 1 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 322 0 307 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 322 0 307 1 0 1 1 0 8 0 vmmpekpl 168 6536 0 6510 2 0 2 2 0 8 0 vmmpepl 168 37443 0 36470 82 10 72 72 0 357 27 vmsppl 368 321 0 307 2 0 2 2 0 8 0 pdppl 4096 651 0 614 6 0 6 6 0 8 1 pvpl 32 125723 0 121538 110 6 104 104 0 265 68 pmappl 232 321 0 307 2 0 2 2 0 8 1 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 238 0 4 7 0 7 7 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(ffffffff823fbb26) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff828bfde0) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828bfde0) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828bfde0,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,1) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 rtm_msg1(14,ffff800020d976f8) at rtm_msg1+0x6e sys/net/rtsock.c:1534 rtm_addr(14,ffff800000aa2b00) at rtm_addr+0x9b sys/net/rtsock.c:1740 nd6_dad_timer(ffff800000aa2b00) at nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 timeout_run(ffff800000af5e30) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffff800000af5e30) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020d89380) at softclock_thread+0x16a sys/kern/kern_timeout.c:580 end trace frame: 0x0, count: -10 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020d70ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff828ac5d8) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828ac5d8) at __mp_lock+0x127 sys/kern/kern_lock.c:147 sleep_setup(ffff800020e839c0,ffffffff827adcc0,120,ffffffff823eaed3) at sleep_setup+0xcf sys/kern/kern_synch.c:373 tsleep(ffffffff827adcc0,120,ffffffff823eaed3,2) at tsleep+0xe6 sleep_setup_timeout sys/kern/kern_synch.c:435 [inline] tsleep(ffffffff827adcc0,120,ffffffff823eaed3,2) at tsleep+0xe6 sys/kern/kern_synch.c:151 sys_nanosleep(ffff800020e40010,ffff800020e83af0,ffff800020e83b40) at sys_nanosleep+0x205 sys/kern/kern_time.c:297 syscall(ffff800020e83bc0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e83bc0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc000045f38, count: 6 ddb{1}> trace x86_ipi_db(ffff800020d70ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff828ac5d8) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828ac5d8) at __mp_lock+0x127 sys/kern/kern_lock.c:147 sleep_setup(ffff800020e839c0,ffffffff827adcc0,120,ffffffff823eaed3) at sleep_setup+0xcf sys/kern/kern_synch.c:373 tsleep(ffffffff827adcc0,120,ffffffff823eaed3,2) at tsleep+0xe6 sleep_setup_timeout sys/kern/kern_synch.c:435 [inline] tsleep(ffffffff827adcc0,120,ffffffff823eaed3,2) at tsleep+0xe6 sys/kern/kern_synch.c:151 sys_nanosleep(ffff800020e40010,ffff800020e83af0,ffff800020e83b40) at sys_nanosleep+0x205 sys/kern/kern_time.c:297 syscall(ffff800020e83bc0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e83bc0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc000045f38, count: -9 ddb{1}>