panic: kernel diagnostic assertion "((len + sizeof(long) - 1) &~ (sizeof(long) - 1)) <= M_SIZE(m)" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/uipc_mbuf.c", line 1380 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 45098 87475 0 0x14000 0x200 1 sosplice 18192 81827 0 0x14000 0x200 0 softnet0 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827a5490) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82827587,ffffffff82790c18,564,ffffffff827db35e) at __assert+0x29 sys/kern/subr_prf.c:157 m_align(fffffd806d1d8000,7b2) at m_align+0x1e8 sys/kern/uipc_mbuf.c:1380 m_split(fffffd807989c300,3836,2) at m_split+0xe0 sys/kern/uipc_mbuf.c:1110 somove(fffffd806d6119a8,2) at somove+0xd5c sys/kern/uipc_socket.c:1673 sotask(fffffd806d6119a8) at sotask+0x52 sys/kern/uipc_socket.c:1427 taskq_thread(ffff800000d06400) at taskq_thread+0xe5 sys/kern/kern_task.c:450 end trace frame: 0x0, count: 7 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 *cpu1: kernel diagnostic assertion "((len + sizeof(long) - 1) &~ (sizeof(long) - 1)) <= M_SIZE(m)" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/uipc_mbuf.c", line 1380 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827a5490) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82827587,ffffffff82790c18,564,ffffffff827db35e) at __assert+0x29 sys/kern/subr_prf.c:157 m_align(fffffd806d1d8000,7b2) at m_align+0x1e8 sys/kern/uipc_mbuf.c:1380 m_split(fffffd807989c300,3836,2) at m_split+0xe0 sys/kern/uipc_mbuf.c:1110 somove(fffffd806d6119a8,2) at somove+0xd5c sys/kern/uipc_socket.c:1673 sotask(fffffd806d6119a8) at sotask+0x52 sys/kern/uipc_socket.c:1427 taskq_thread(ffff800000d06400) at taskq_thread+0xe5 sys/kern/kern_task.c:450 end trace frame: 0x0, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002126bb90 rbx 0xffff800020d59ba7 rdx 0x3fd rcx 0 rax 0xb7 r8 0x101010101010101 r9 0x8080808080808080 r10 0xd12e352ac0890667 r11 0xdb4b4ec687c38886 r12 0xffff800020d599a8 r13 0 r14 0 r15 0x1 rip 0xffffffff815a6dac db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff80002126bb80 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb{1}> show proc PROC (sosplice) tid=45098 pid=87475 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff8000211b3a98,0xffff8000211f5818 process=0xffff8000ffff4870 user=0xffff800021266000, vmspace=0xffffffff82d48650 estcpu=0, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *87475 45098 0 0 7 0x14200 sosplice 7747 464220 51247 0 3 0x82 nanoslp syz-executor1316767679 51247 283625 64027 0 3 0x10008a sigsusp ksh 64027 403153 6495 0 3 0x9a kqread sshd 25222 308734 1 0 3 0x100083 ttyin getty 6495 308463 1 0 3 0x88 kqread sshd 22336 76096 39279 74 3 0x1100092 bpf pflogd 39279 25378 1 0 3 0x80 netio pflogd 9958 472291 459 73 3 0x1100090 kqread syslogd 459 24988 1 0 3 0x100082 netio syslogd 40069 441954 1 0 3 0x100080 kqread resolvd 42155 16644 61909 77 3 0x100092 kqread dhcpleased 68825 381871 61909 77 3 0x100092 kqread dhcpleased 61909 506799 1 0 3 0x80 kqread dhcpleased 64196 105201 0 0 3 0x14200 bored smr 3002 412535 0 0 3 0x14200 pgzero zerothread 12226 317329 0 0 3 0x14200 aiodoned aiodoned 48982 317648 0 0 3 0x14200 syncer update 97833 46308 0 0 3 0x14200 cleaner cleaner 15231 63463 0 0 3 0x14200 reaper reaper 35945 90938 0 0 3 0x14200 pgdaemon pagedaemon 12391 167146 0 0 3 0x14200 bored viomb 14495 349656 0 0 3 0x40014200 acpi0 acpi0 89776 460134 0 0 3 0x40014200 idle1 59882 132807 0 0 3 0x14200 bored softnet3 66491 393024 0 0 3 0x14200 bored softnet2 28115 319175 0 0 3 0x14200 bored softnet1 81827 18192 0 0 7 0x14200 softnet0 37618 284232 0 0 3 0x14200 bored systqmp 74356 124672 0 0 3 0x14200 bored systq 63282 157575 0 0 3 0x14200 tmoslp softclockmp 29477 352117 0 0 3 0x40014200 tmoslp softclock 16567 328514 0 0 3 0x40014200 idle0 1 382650 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive sched_lock &sched_lock r = 0 (0xffffffff82c913c8) #0 witness_lock+0x447 #1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 #2 mi_switch+0x486 sys/kern/sched_bsd.c:473 #3 sleep_finish+0x19b sys/kern/kern_synch.c:414 #4 msleep+0xea sys/kern/kern_synch.c:249 #5 taskq_next_work+0x6e sys/kern/kern_task.c:403 #6 taskq_thread+0x135 sys/kern/kern_task.c:443 #7 proc_trampoline+0x1c Process 87475 (sosplice) thread 0xffff8000211f5ab0 (45098) exclusive rwlock netlock r = 0 (0xffffffff82ba48a0) #0 witness_lock+0x447 #1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309 #2 sotask+0x1e sys/kern/uipc_socket.c:1419 #3 taskq_thread+0xe5 sys/kern/kern_task.c:450 #4 proc_trampoline+0x1c shared rwlock sosplice r = 0 (0xffff800000d06470) #0 witness_lock+0x447 #1 taskq_thread+0xca sys/kern/kern_task.c:446 #2 proc_trampoline+0x1c ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10163 6456K 6457K 78643K 11241 0 pcb 13 8K 8K 78643K 13 0 rtable 58 1K 2K 78643K 114 0 pf 15 6K 10K 78643K 26 0 ifaddr 13 9K 9K 78643K 13 0 ifgroup 22 1K 1K 78643K 22 0 counters 44 33K 33K 78643K 44 0 ioctlops 0 0K 4K 78643K 1475 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1176 74K 74K 78643K 1192 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 1697 195K 286K 78643K 12548 0 file desc 1 0K 0K 78643K 1 0 proc 67 91K 91K 78643K 302 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 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 25 122K 122K 78643K 25 0 exec 0 0K 1K 78643K 269 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 111 12K 12K 78643K 2506 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 4 0K 0K 78643K 4 0 temp 1 5908K 5972K 78643K 3107 0 kqueue 11 16K 18K 78643K 24 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 plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 20 0 17 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 144 35 0 20 1 0 1 1 0 8 0 syncache 304 7 0 7 2 1 1 1 0 8 1 tcpqe 32 200 0 200 2 1 1 1 0 8 1 tcpcb 808 14 0 8 1 0 1 1 0 8 0 arp 120 2 0 0 1 0 1 1 0 8 0 inpcb 368 39 0 30 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 9 0 7 2 1 1 1 0 8 0 pfstkey 128 9 0 7 2 1 1 1 0 8 0 pfstate 376 9 0 7 2 1 1 1 0 8 0 pfrule 1344 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 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1435 0 39 88 0 88 88 0 8 0 ffsino 272 1435 0 39 94 0 94 94 0 8 0 nchpl 144 1623 0 52 59 0 59 59 0 8 0 uvmvnodes 80 1449 0 0 30 0 30 30 0 8 0 vnodes 216 1449 0 0 81 0 81 81 0 8 0 namei 1024 4569 0 4569 2 1 1 1 0 8 1 percpumem 16 35 0 0 1 0 1 1 0 8 0 kstatmem 264 8 0 0 1 0 1 1 0 8 0 scxspl 216 5150 0 5150 10 9 1 8 1 8 1 plimitpl 152 18 0 10 1 0 1 1 0 8 0 sigapl 424 341 0 306 5 1 4 5 0 8 0 futexpl 64 17 0 17 1 0 1 1 0 8 1 knotepl 120 41 0 0 2 0 2 2 0 8 0 kqueuepl 216 20 0 13 1 0 1 1 0 8 0 pipepl 320 94 0 91 2 1 1 1 0 8 0 fdescpl 496 322 0 306 3 0 3 3 0 8 0 filepl 152 1282 0 1221 3 0 3 3 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 18 0 9 1 0 1 1 0 8 0 pgrppl 48 18 0 9 1 0 1 1 0 8 0 ucredpl 104 71 0 59 1 0 1 1 0 8 0 zombiepl 144 307 0 306 2 1 1 1 0 8 0 processpl 1072 341 0 306 3 0 3 3 0 8 0 procpl 680 345 0 310 5 1 4 4 0 8 0 sosppl 168 4 0 2 1 0 1 1 0 8 0 sockpl 488 94 0 67 5 1 4 4 0 8 0 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 298 0 0 33 4 29 33 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 328 0 0 18 1 17 18 0 8 0 bufpl 288 2536 0 86 175 0 175 175 0 8 0 anonpl 24 175991 0 173915 29 15 14 25 0 186 1 amapchunkpl 152 8592 0 8415 8 1 7 8 0 158 0 amappl16 200 5011 0 5009 6 5 1 5 0 8 0 amappl15 192 9 0 9 1 1 0 1 0 8 0 amappl14 184 111 0 100 1 0 1 1 0 8 0 amappl13 176 10 0 10 1 1 0 1 0 8 0 amappl12 168 874 0 857 2 1 1 2 0 8 0 amappl11 160 78 0 64 1 0 1 1 0 8 0 amappl10 152 28 0 28 2 1 1 1 0 8 1 amappl9 144 147 0 147 1 1 0 1 0 8 0 amappl8 136 32 0 30 1 0 1 1 0 8 0 amappl7 128 25 0 22 1 0 1 1 0 8 0 amappl6 120 184 0 169 1 0 1 1 0 8 0 amappl5 112 118 0 107 1 0 1 1 0 8 0 amappl4 104 468 0 434 1 0 1 1 0 8 0 amappl3 96 2438 0 2399 2 1 1 2 0 8 0 amappl2 88 499 0 451 2 0 2 2 0 8 0 amappl1 80 9508 0 9031 16 4 12 12 0 8 0 amappl 88 2202 0 2138 2 0 2 2 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 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 72 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 322 0 306 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 322 0 306 1 0 1 1 0 8 0 vmmpekpl 168 7311 0 7296 1 0 1 1 0 8 0 vmmpepl 168 35917 0 34829 59 8 51 52 0 357 3 vmsppl 464 321 0 306 3 0 3 3 0 8 0 rwobjpl 56 19237 0 17075 34 3 31 33 0 8 0 pdppl 4096 651 0 612 59 20 39 45 0 8 0 pvpl 32 279106 0 274203 64 21 43 57 0 265 3 pmappl 248 321 0 306 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 492 0 29 14 0 14 14 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82c07ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82c58b00) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c58b00) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x52 sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __sanitizer_cov_trace_const_cmp4(ffff80000002d000,ffff80002118d9e0) at __sanitizer_cov_trace_const_cmp4+0x10 sys/dev/kcov.c:234 taskq_thread(ffff80000002d000) at taskq_thread+0x135 sys/kern/kern_task.c:443 end trace frame: 0x0, count: 7 ddb{0}> trace x86_ipi_db(ffffffff82c07ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82c58b00) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c58b00) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x52 sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __sanitizer_cov_trace_const_cmp4(ffff80000002d000,ffff80002118d9e0) at __sanitizer_cov_trace_const_cmp4+0x10 sys/dev/kcov.c:234 taskq_thread(ffff80000002d000) at taskq_thread+0x135 sys/kern/kern_task.c:443 end trace frame: 0x0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x1c: addq $0x8,%rsp db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827a5490) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82827587,ffffffff82790c18,564,ffffffff827db35e) at __assert+0x29 sys/kern/subr_prf.c:157 m_align(fffffd806d1d8000,7b2) at m_align+0x1e8 sys/kern/uipc_mbuf.c:1380 m_split(fffffd807989c300,3836,2) at m_split+0xe0 sys/kern/uipc_mbuf.c:1110 somove(fffffd806d6119a8,2) at somove+0xd5c sys/kern/uipc_socket.c:1673 sotask(fffffd806d6119a8) at sotask+0x52 sys/kern/uipc_socket.c:1427 taskq_thread(ffff800000d06400) at taskq_thread+0xe5 sys/kern/kern_task.c:450 end trace frame: 0x0, count: 7 ddb{1}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff827a5490) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82827587,ffffffff82790c18,564,ffffffff827db35e) at __assert+0x29 sys/kern/subr_prf.c:157 m_align(fffffd806d1d8000,7b2) at m_align+0x1e8 sys/kern/uipc_mbuf.c:1380 m_split(fffffd807989c300,3836,2) at m_split+0xe0 sys/kern/uipc_mbuf.c:1110 somove(fffffd806d6119a8,2) at somove+0xd5c sys/kern/uipc_socket.c:1673 sotask(fffffd806d6119a8) at sotask+0x52 sys/kern/uipc_socket.c:1427 taskq_thread(ffff800000d06400) at taskq_thread+0xe5 sys/kern/kern_task.c:450 end trace frame: 0x0, count: -8