login: panic: lock (kernel_lock) mbufpl not locked Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 123054 77642 0 0 0 0 syz-executor.0 *438016 77642 0 0 0x4000000 1K syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821b6a4e) at panic+0x15c sys/kern/subr_prf.c:207 witness_unlock(ffffffff8262c8e8,8) at witness_unlock+0x4db mtx_leave(ffffffff8262c8d8) at mtx_leave+0x97 sys/kern/kern_lock.c:364 pool_cache_get(ffffffff8262c7f0) at pool_cache_get+0x195 pool_cache_list_alloc sys/kern/subr_pool.c:1816 [inline] pool_cache_get(ffffffff8262c7f0) at pool_cache_get+0x195 sys/kern/subr_pool.c:1887 pool_get(ffffffff8262c7f0,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_pullup(fffffd806f60cb00,2200) at m_pullup+0x242 m_get sys/kern/uipc_mbuf.c:250 [inline] m_pullup(fffffd806f60cb00,2200) at m_pullup+0x242 sys/kern/uipc_mbuf.c:976 swofp_input(ffff800000a49800,fffffd806f60cb00) at swofp_input+0x13f sys/net/switchofp.c:4703 switchwrite(86135,ffff8000237a9ac0,1) at switchwrite+0x3b0 sys/net/switchctl.c:282 spec_write(ffff8000237a9890) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd8062d97900,ffff8000237a9ac0,1,fffffd807f7be5a0) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:269 vn_write(fffffd8065d9a148,ffff8000237a9ac0,1) at vn_write+0x199 sys/kern/vfs_vnops.c:414 dofilewritev(ffff800020ac9650,3,ffff8000237a9ac0,1,ffff8000237a9bb0) at dofilewritev+0x1b7 sys/kern/sys_generic.c:364 sys_pwritev(ffff800020ac9650,ffff8000237a9b68,ffff8000237a9bb0) at sys_pwritev+0xb8 sys/kern/vfs_syscalls.c:3260 end trace frame: 0xffff8000237a9c20, count: 0 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic lock (kernel_lock) mbufpl not locked ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821b6a4e) at panic+0x15c sys/kern/subr_prf.c:207 witness_unlock(ffffffff8262c8e8,8) at witness_unlock+0x4db mtx_leave(ffffffff8262c8d8) at mtx_leave+0x97 sys/kern/kern_lock.c:364 pool_cache_get(ffffffff8262c7f0) at pool_cache_get+0x195 pool_cache_list_alloc sys/kern/subr_pool.c:1816 [inline] pool_cache_get(ffffffff8262c7f0) at pool_cache_get+0x195 sys/kern/subr_pool.c:1887 pool_get(ffffffff8262c7f0,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_pullup(fffffd806f60cb00,2200) at m_pullup+0x242 m_get sys/kern/uipc_mbuf.c:250 [inline] m_pullup(fffffd806f60cb00,2200) at m_pullup+0x242 sys/kern/uipc_mbuf.c:976 swofp_input(ffff800000a49800,fffffd806f60cb00) at swofp_input+0x13f sys/net/switchofp.c:4703 switchwrite(86135,ffff8000237a9ac0,1) at switchwrite+0x3b0 sys/net/switchctl.c:282 spec_write(ffff8000237a9890) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd8062d97900,ffff8000237a9ac0,1,fffffd807f7be5a0) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:269 vn_write(fffffd8065d9a148,ffff8000237a9ac0,1) at vn_write+0x199 sys/kern/vfs_vnops.c:414 dofilewritev(ffff800020ac9650,3,ffff8000237a9ac0,1,ffff8000237a9bb0) at dofilewritev+0x1b7 sys/kern/sys_generic.c:364 sys_pwritev(ffff800020ac9650,ffff8000237a9b68,ffff8000237a9bb0) at sys_pwritev+0xb8 sys/kern/vfs_syscalls.c:3260 syscall(ffff8000237a9c30) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff8000237a9c30) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x45f6c1f1150, count: -16 ddb{1}> show registers rdi 0xffffffff816d6247 db_enter+0x17 rsi 0x4a40 __ALIGN_SIZE+0x3a40 rbp 0xffff8000237a93e0 rbx 0xffff8000237a9490 rdx 0x4a41 __ALIGN_SIZE+0x3a41 rcx 0xffff800020b80000 rax 0xffff800020b80000 r8 0xffffffff813f6f6f kprintf+0x16f r9 0x1 r10 0x25 r11 0xae981263a894e9ef r12 0x3000000008 r13 0xffff8000237a93f0 r14 0x100 r15 0x1 rip 0xffffffff816d6248 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000237a93d0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=438016 stat=onproc flags process=0 proc=4000000 pri=61, usrpri=61, nice=20 forw=0xffffffffffffffff, list=0xffff800020ac8780,0xffffffff82629b28 process=0xffff800020af5880 user=0xffff8000237a4000, vmspace=0xfffffd807efff730 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 77642 123054 45313 0 7 0 syz-executor.0 *77642 438016 45313 0 7 0x4000000 syz-executor.0 38963 248739 0 0 3 0x14200 bored sosplice 5117 11087 17573 0 3 0x2 biowait syz-executor.1 45313 226341 17573 0 3 0x82 nanosleep syz-executor.0 17573 307740 45994 0 3 0x82 nanosleep syz-fuzzer 17573 86388 45994 0 3 0x4000082 nanosleep syz-fuzzer 17573 191417 45994 0 3 0x4000082 thrsleep syz-fuzzer 17573 348345 45994 0 3 0x4000082 thrsleep syz-fuzzer 17573 206088 45994 0 3 0x4000082 thrsleep syz-fuzzer 17573 215261 45994 0 3 0x4000082 kqread syz-fuzzer 17573 200814 45994 0 3 0x4000082 thrsleep syz-fuzzer 17573 68726 45994 0 3 0x4000082 thrsleep syz-fuzzer 17573 484623 45994 0 3 0x4000082 thrsleep syz-fuzzer 17573 335095 45994 0 3 0x4000082 thrsleep syz-fuzzer 45994 494899 38819 0 3 0x10008a pause ksh 38819 245608 98097 0 3 0x92 select sshd 55749 57453 1 0 3 0x100083 ttyin getty 98097 326899 1 0 3 0x80 select sshd 62183 423178 83000 74 3 0x100092 bpf pflogd 83000 390226 1 0 3 0x80 netio pflogd 43286 293904 39299 73 3 0x100090 kqread syslogd 39299 297927 1 0 3 0x100082 netio syslogd 20189 246030 1 77 3 0x100090 poll dhclient 89114 343403 1 0 3 0x80 poll dhclient 41771 300421 0 0 2 0x14200 zerothread 34030 392815 0 0 3 0x14200 aiodoned aiodoned 11671 288043 0 0 3 0x14200 syncer update 37820 310480 0 0 3 0x14200 cleaner cleaner 39231 105383 0 0 3 0x14200 reaper reaper 71180 349008 0 0 3 0x14200 pgdaemon pagedaemon 49375 112519 0 0 3 0x14200 bored crynlk 15012 266617 0 0 3 0x14200 bored crypto 61286 55705 0 0 3 0x40014200 acpi0 acpi0 92353 158828 0 0 3 0x40014200 idle1 45852 467944 0 0 3 0x14200 bored softnet 4595 249382 0 0 3 0x14200 bored systqmp 88072 126406 0 0 3 0x14200 bored systq 46232 248950 0 0 3 0x40014200 bored softclock 69008 20428 0 0 3 0x40014200 idle0 53995 494633 0 0 3 0x14200 bored smr 1 480846 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive kernel_lock mbufpl r = 0 (0xffffffff8262c8e8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 mtx_enter_try+0x102 #2 pool_cache_get+0xa3 pl_enter_try sys/kern/subr_pool.c:109 [inline] #2 pool_cache_get+0xa3 pool_list_enter sys/kern/subr_pool.c:1797 [inline] #2 pool_cache_get+0xa3 pool_cache_list_alloc sys/kern/subr_pool.c:1814 [inline] #2 pool_cache_get+0xa3 sys/kern/subr_pool.c:1887 #3 pool_get+0x91 sys/kern/subr_pool.c:572 #4 m_pullup+0x242 m_get sys/kern/uipc_mbuf.c:250 [inline] #4 m_pullup+0x242 sys/kern/uipc_mbuf.c:976 #5 swofp_input+0x13f sys/net/switchofp.c:4703 #6 switchwrite+0x3b0 sys/net/switchctl.c:282 #7 spec_write+0xd4 sys/kern/spec_vnops.c:309 #8 VOP_WRITE+0xc6 sys/kern/vfs_vops.c:269 #9 vn_write+0x199 sys/kern/vfs_vnops.c:414 #10 dofilewritev+0x1b7 sys/kern/sys_generic.c:364 #11 sys_pwritev+0xb8 sys/kern/vfs_syscalls.c:3260 #12 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #12 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #13 Xsyscall+0x128 Process 77642 (syz-executor.0) thread 0xffff800020ac9650 (438016) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff826509a0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 vn_write+0x42 sys/kern/vfs_vnops.c:399 #2 dofilewritev+0x1b7 sys/kern/sys_generic.c:364 #3 sys_pwritev+0xb8 sys/kern/vfs_syscalls.c:3260 #4 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #4 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #5 Xsyscall+0x128 exclusive kernel_lock mbufpl r = 0 (0xffffffff8262c8e8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 mtx_enter_try+0x102 #2 pool_cache_get+0xa3 pl_enter_try sys/kern/subr_pool.c:109 [inline] #2 pool_cache_get+0xa3 pool_list_enter sys/kern/subr_pool.c:1797 [inline] #2 pool_cache_get+0xa3 pool_cache_list_alloc sys/kern/subr_pool.c:1814 [inline] #2 pool_cache_get+0xa3 sys/kern/subr_pool.c:1887 #3 pool_get+0x91 sys/kern/subr_pool.c:572 #4 m_pullup+0x242 m_get sys/kern/uipc_mbuf.c:250 [inline] #4 m_pullup+0x242 sys/kern/uipc_mbuf.c:976 #5 swofp_input+0x13f sys/net/switchofp.c:4703 #6 switchwrite+0x3b0 sys/net/switchctl.c:282 #7 spec_write+0xd4 sys/kern/spec_vnops.c:309 #8 VOP_WRITE+0xc6 sys/kern/vfs_vops.c:269 #9 vn_write+0x199 sys/kern/vfs_vnops.c:414 #10 dofilewritev+0x1b7 sys/kern/sys_generic.c:364 #11 sys_pwritev+0xb8 sys/kern/vfs_syscalls.c:3260 #12 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #12 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #13 Xsyscall+0x128 Process 5117 (syz-executor.1) thread 0xffff800020ac89f8 (11087) exclusive rrwlock inode r = 0 (0xfffffd8066b56920) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:453 #3 VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:571 #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:1323 #8 ufs_lookup+0x14b7 sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:91 #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:1776 #13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806acc3098) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:453 #3 VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:571 #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:1776 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9500 6472K 6982K 78643K 10700 0 pcb 13 8K 8K 78643K 29 0 rtable 105 3K 3K 78643K 211 0 ifaddr 61 13K 13K 78643K 65 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1471 0 iov 1 2K 16K 78643K 11 0 mount 1 1K 1K 78643K 1 0 vnodes 1220 77K 77K 78643K 1259 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 12 0K 0K 78643K 22 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 5 13K 25K 78643K 81 0 sigio 0 0K 0K 78643K 8 0 proc 60 63K 95K 78643K 439 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 47 2K 2K 78643K 47 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 37 175K 175K 78643K 37 0 exec 0 0K 1K 78643K 208 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 108 21K 22K 78643K 1188 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 9 0K 0K 78643K 13 0 temp 84 3009K 3073K 78643K 4888 0 kqueue 3 4K 21K 78643K 18 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> 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 25 0 23 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 99 0 89 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 99 0 99 1 0 1 1 0 8 1 tcpcb 544 24 0 20 1 0 1 1 0 8 0 inpcb 280 83 0 76 2 0 2 2 0 8 1 nd6 48 4 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 0 1 0 1 1 0 8 0 pfstkey 112 11 0 0 1 0 1 1 0 8 0 pfstate 328 11 0 0 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 256 212 0 0 14 0 14 14 0 8 0 art_table 32 213 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 semapl 112 20 0 10 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1502 0 94 46 0 46 46 0 8 0 ffsino 272 1502 0 94 95 0 95 95 0 8 0 nchpl 144 1800 0 180 61 0 61 61 0 8 0 uvmvnodes 72 1572 0 0 29 0 29 29 0 8 0 vnodes 208 1572 0 0 83 0 83 83 0 8 0 namei 1024 4737 0 4737 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 4800 0 4799 2 1 1 2 0 8 0 plimitpl 152 23 0 15 1 0 1 1 0 8 0 sigapl 432 280 0 265 3 0 3 3 0 8 1 futexpl 56 1058 0 1058 1 0 1 1 0 8 1 knotepl 112 87 0 68 1 0 1 1 0 8 0 kqueuepl 104 79 0 77 1 0 1 1 0 8 0 pipelkpl 48 88 0 78 1 0 1 1 0 8 0 pipepl 120 176 0 157 1 0 1 1 0 8 0 fdescpl 496 281 0 265 3 0 3 3 0 8 0 filepl 152 1622 0 1521 5 0 5 5 0 8 1 lockfpl 104 14 0 13 1 0 1 1 0 8 0 lockfspl 48 6 0 5 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 96 134 0 125 1 0 1 1 0 8 0 zombiepl 144 265 0 265 1 0 1 1 0 8 1 processpl 896 297 0 265 4 0 4 4 0 8 0 procpl 632 416 0 374 5 0 5 5 0 8 1 sosppl 128 2 0 2 1 0 1 1 0 8 1 sockpl 384 207 0 188 4 0 4 4 0 8 2 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 166 0 0 20 0 20 20 0 8 0 mtagpl 80 4 0 0 1 0 1 1 0 8 0 mbufpl 256 167 0 0 10 0 10 10 0 8 0 bufpl 280 6330 0 1340 357 0 357 357 0 8 0 anonpl 16 41064 0 25538 64 1 63 63 0 125 0 amapchunkpl 152 1280 0 1152 8 0 8 8 0 158 2 amappl16 192 1093 0 246 44 1 43 43 0 8 0 amappl15 184 59 0 55 1 0 1 1 0 8 0 amappl14 176 57 0 53 1 0 1 1 0 8 0 amappl13 168 8 0 7 1 0 1 1 0 8 0 amappl12 160 5 0 2 1 0 1 1 0 8 0 amappl11 152 56 0 41 1 0 1 1 0 8 0 amappl10 144 17 0 10 1 0 1 1 0 8 0 amappl9 136 626 0 621 1 0 1 1 0 8 0 amappl8 128 135 0 116 1 0 1 1 0 8 0 amappl7 120 101 0 90 1 0 1 1 0 8 0 amappl6 112 60 0 53 1 0 1 1 0 8 0 amappl5 104 128 0 115 1 0 1 1 0 8 0 amappl4 96 535 0 503 2 0 2 2 0 8 1 amappl3 88 143 0 134 1 0 1 1 0 8 0 amappl2 80 1348 0 1273 3 0 3 3 0 8 1 amappl1 72 16405 0 15964 25 8 17 20 0 8 7 amappl 80 657 0 614 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 281 0 265 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 281 0 265 1 0 1 1 0 8 0 vmmpekpl 168 6128 0 6094 2 0 2 2 0 8 0 vmmpepl 168 41874 0 39863 115 5 110 110 0 357 21 vmsppl 368 280 0 265 2 0 2 2 0 8 0 pdppl 4096 569 0 530 6 0 6 6 0 8 1 pvpl 32 142590 0 123896 152 0 152 152 0 265 1 pmappl 232 280 0 265 2 0 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 160 0 3 5 0 5 5 0 8 0