panic: WpAoRNoIl_NcaGc:h Se_PiLt NeOm_T maLOgiWEcR_cEDh eOcNk: S mYSbCuAfLpLl 1c3pu7 f r-8ee87 0li4 sEtX ImTo d0 i9f i eStopped at savectx+0xb1: movl $0,%gs:0x530 TID PID UID PRFLAGS PFLAGS CPU COMMAND *211665 44008 0 0x2 0 0 syz-executor.0 67535 18402 0 0x12 0 1 sshd savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffea570, 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 0xfffffd8060d93300+16 0x0!=0xfdaf2202a1dbdd70 ddb{0}> trace savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffea570, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800021b9d600 rbx 0 rdx 0xffff800020ace518 rcx 0 rax 0x38 r8 0xffffffff815a9a5f kprintf+0x16f r9 0x1 r10 0x25 r11 0xe598164a292014a7 r12 0 r13 0 r14 0xffff800020ace518 r15 0 rip 0xffffffff815033f1 savectx+0xb1 cs 0x8 rflags 0x46 rsp 0xffff800021b9d580 ss 0x10 savectx+0xb1: movl $0,%gs:0x530 ddb{0}> show proc PROC (syz-executor.0) pid=211665 stat=onproc flags process=2 proc=0 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ace790,0xffff800020acea18 process=0xffff800020adc000 user=0xffff800021b98000, vmspace=0xfffffd807f00a8a0 estcpu=36, cpticks=1, pctcpu=0.2 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 41887 171479 44032 0 2 0 syz-executor.1 41887 237795 44032 0 3 0x4000080 netio syz-executor.1 23963 433930 0 0 3 0x14200 acct acct *44008 211665 91569 0 7 0x2 syz-executor.0 44032 209967 91569 0 3 0x82 nanosleep syz-executor.1 31765 113997 1 0 3 0x100083 ttyin getty 52575 256579 0 0 3 0x14200 bored sosplice 91569 120643 72036 0 3 0x82 kqread syz-fuzzer 91569 215759 72036 0 3 0x4000082 nanosleep syz-fuzzer 91569 459450 72036 0 3 0x4000082 thrsleep syz-fuzzer 91569 110197 72036 0 3 0x4000082 thrsleep syz-fuzzer 91569 10960 72036 0 3 0x4000082 thrsleep syz-fuzzer 91569 233644 72036 0 3 0x4000082 nanosleep syz-fuzzer 91569 5529 72036 0 3 0x4000082 thrsleep syz-fuzzer 91569 70931 72036 0 3 0x4000082 thrsleep syz-fuzzer 91569 231173 72036 0 3 0x4000082 thrsleep syz-fuzzer 91569 176368 72036 0 3 0x4000082 thrsleep syz-fuzzer 72036 1705 18402 0 3 0x10008a pause ksh 18402 67535 54675 0 7 0x12 sshd 54675 381107 1 0 3 0x80 select sshd 3798 292648 60936 74 3 0x100092 bpf pflogd 60936 275536 1 0 3 0x80 netio pflogd 51047 494745 79172 73 3 0x100090 kqread syslogd 79172 64880 1 0 3 0x100082 netio syslogd 31426 127474 1 77 3 0x100090 poll dhclient 58314 488191 1 0 3 0x80 poll dhclient 27865 399104 0 0 3 0x14200 pgzero zerothread 35367 285037 0 0 3 0x14200 aiodoned aiodoned 5196 48363 0 0 3 0x14200 syncer update 94117 195769 0 0 3 0x14200 cleaner cleaner 90503 431182 0 0 3 0x14200 reaper reaper 9680 24653 0 0 3 0x14200 pgdaemon pagedaemon 66823 267112 0 0 3 0x14200 bored crynlk 52731 172588 0 0 3 0x14200 bored crypto 68885 31338 0 0 3 0x40014200 acpi0 acpi0 18674 87569 0 0 3 0x40014200 idle1 10544 221567 0 0 3 0x14200 bored softnet 25624 513926 0 0 3 0x14200 bored systqmp 727 462036 0 0 3 0x14200 bored systq 97936 244713 0 0 3 0x40014200 bored softclock 45073 97556 0 0 3 0x40014200 idle0 36549 132128 0 0 3 0x14200 bored smr 1 294162 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &diskp->dk_mtx r = 0 (0xffff800000172898) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 disk_busy+0x21 sys/kern/subr_disk.c:1235 #4 sdstart+0x3dc sys/scsi/sd.c:711 #5 scsi_iopool_run+0x129 scsi_ioh_pending sys/scsi/scsi_base.c:394 [inline] #5 scsi_iopool_run+0x129 sys/scsi/scsi_base.c:410 #6 scsi_xsh_runqueue+0x210 sys/scsi/scsi_base.c:586 #7 scsi_xsh_add+0xc9 sys/scsi/scsi_base.c:525 #8 sdstrategy+0x187 sys/scsi/sd.c:582 #9 spec_strategy+0x74 sys/kern/spec_vnops.c:468 #10 VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:727 #11 bwrite+0x1b9 sys/kern/vfs_bio.c:738 #12 ffs_update+0x2c2 sys/ufs/ffs/ffs_inode.c:113 #13 ffs_truncate+0xc76 #14 ufs_rmdir+0x3af sys/ufs/ufs/ufs_vnops.c:1357 #15 VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474 #16 dounlinkat+0x14c sys/kern/vfs_syscalls.c:1818 #17 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #17 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #18 Xsyscall+0x128 Process 44008 (syz-executor.0) thread 0xffff800020ace518 (211665) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8263a9c8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 #2 mi_switch+0x392 sys/kern/sched_bsd.c:434 #3 sleep_finish+0x113 sys/kern/kern_synch.c:374 #4 sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:403 [inline] #4 sleep_finish_all+0x32 sys/kern/kern_synch.c:183 #5 tsleep+0x1cf sys/kern/kern_synch.c:153 #6 biowait+0xa1 sys/kern/vfs_bio.c:1231 #7 bwrite+0x1e4 sys/kern/vfs_bio.c:747 #8 ufs_dirremove+0x291 #9 ufs_rmdir+0x247 sys/ufs/ufs/ufs_vnops.c:1330 #10 VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474 #11 dounlinkat+0x14c sys/kern/vfs_syscalls.c:1818 #12 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #12 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #13 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8064d7c920) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x447 sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:571 #5 vget+0x1c3 sys/kern/vfs_subr.c:672 #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+0x14b4 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:1785 #13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e13de70) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x447 sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0xf0 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:1785 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #9 Xsyscall+0x128 exclusive mutex &diskp->dk_mtx r = 0 (0xffff800000172898) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 disk_busy+0x21 sys/kern/subr_disk.c:1235 #4 sdstart+0x3dc sys/scsi/sd.c:711 #5 scsi_iopool_run+0x129 scsi_ioh_pending sys/scsi/scsi_base.c:394 [inline] #5 scsi_iopool_run+0x129 sys/scsi/scsi_base.c:410 #6 scsi_xsh_runqueue+0x210 sys/scsi/scsi_base.c:586 #7 scsi_xsh_add+0xc9 sys/scsi/scsi_base.c:525 #8 sdstrategy+0x187 sys/scsi/sd.c:582 #9 spec_strategy+0x74 sys/kern/spec_vnops.c:468 #10 VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:727 #11 bwrite+0x1b9 sys/kern/vfs_bio.c:738 #12 ffs_update+0x2c2 sys/ufs/ffs/ffs_inode.c:113 #13 ffs_truncate+0xc76 #14 ufs_rmdir+0x3af sys/ufs/ufs/ufs_vnops.c:1357 #15 VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474 #16 dounlinkat+0x14c sys/kern/vfs_syscalls.c:1818 #17 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #17 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #18 Xsyscall+0x128 Process 18402 (sshd) thread 0xffff800020ac1b38 (67535) exclusive rwlock netlock r = 0 (0xffffffff8247ccd8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sosend+0x51b sys/kern/uipc_socket.c:512 #3 dofilewritev+0x1b7 sys/kern/sys_generic.c:364 #4 sys_write+0x83 sys/kern/sys_generic.c:284 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #6 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9593 6596K 9405K 78643K 21141 0 0 pcb 13 9K 9K 78643K 1157 0 0 rtable 121 6K 6K 78643K 2579 0 0 ifaddr 274 31K 32K 78643K 977 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1687 0 0 iov 0 0K 32K 78643K 710 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1234 77K 78K 78643K 4976 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 49 0 0 VM map 40 20K 20K 78643K 56 0 0 sem 12 0K 1K 78643K 1016 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 3364 0 0 sigio 0 0K 0K 78643K 86 0 0 proc 61 63K 95K 78643K 1702 0 0 subproc 32 2K 2K 78643K 408 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 1K 78643K 295 0 0 in_multi 71 4K 4K 78643K 490 0 0 ether_multi 1 0K 0K 78643K 34 0 0 mrt 0 0K 0K 78643K 21 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 84 371K 371K 78643K 84 0 0 exec 0 0K 1K 78643K 879 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 186 301K 302K 78643K 12746 0 0 UVM aobj 130 6K 6K 78643K 138 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 1K 78643K 961 0 0 NDP 22 0K 1K 78643K 247 0 0 temp 178 3556K 4195K 78643K 96759 0 0 kqueue 0 0K 0K 78643K 29 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 95 0 86 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 348 0 346 1 0 1 1 0 8 0 rtentry 112 433 0 387 2 0 2 2 0 8 0 unpcb 120 2083 0 2066 2 1 1 2 0 8 0 syncache 264 14 0 14 6 6 0 1 0 8 0 tcpqe 32 332 0 332 5 5 0 1 0 8 0 tcpcb 544 1733 0 1729 11 10 1 4 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 2 0 2 1 1 0 1 0 8 0 inpcb 280 5911 0 5903 25 23 2 6 0 8 1 rttmr 72 8 0 7 1 0 1 1 0 8 0 nd6 48 63 0 60 2 1 1 1 0 8 0 pkpcb 40 15 0 15 3 3 0 1 0 8 0 swfcl 56 3 0 0 1 0 1 1 0 8 0 ppxss 1128 110 0 110 16 15 1 1 0 8 1 pffrag 232 91 0 91 14 13 1 1 0 482 1 pffrnode 88 91 0 91 14 13 1 1 0 8 1 pffrent 40 3750 0 3750 14 13 1 1 0 8 1 pfosfp 40 846 0 846 5 0 5 5 0 8 5 pfosfpen 112 1428 0 1428 21 0 21 21 0 8 21 pfstitem 24 304 0 237 1 0 1 1 0 8 0 pfstkey 112 304 0 237 3 0 3 3 0 8 0 pfstate 328 304 0 237 7 0 7 7 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 5 0 4 4 3 1 3 0 8 0 art_heap4 256 1949 0 1699 34 18 16 17 0 8 0 art_table 32 1954 0 1703 6 3 3 3 0 8 0 art_node 16 432 0 389 1 0 1 1 0 8 0 sysvmsgpl 40 15 0 8 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 1014 0 1004 1 0 1 1 0 8 0 shmpl 112 136 0 8 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 6970 0 5559 46 0 46 46 0 8 0 ffsino 272 6970 0 5559 95 0 95 95 0 8 0 nchpl 144 12342 0 11878 61 40 21 61 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 208 5926 0 0 312 0 312 312 0 8 0 namei 1024 44975 0 44975 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 38 0 0 5 0 5 5 0 8 0 vmpool 552 54 0 16 3 0 3 3 0 8 0 scxspl 192 40978 0 40978 27 26 1 7 0 8 1 plimitpl 152 288 0 280 1 0 1 1 0 8 0 sigapl 432 3500 0 3485 3 1 2 3 0 8 0 futexpl 56 83805 0 83805 2 1 1 1 0 8 1 knotepl 112 838 0 819 5 4 1 3 0 8 0 kqueuepl 104 1025 0 1022 3 2 1 2 0 8 0 pipepl 160 4820 0 4801 4 2 2 2 0 8 1 fdescpl 488 3501 0 3485 3 0 3 3 0 8 0 filepl 152 34967 0 34860 25 19 6 8 0 8 1 lockfpl 104 1512 0 1511 1 0 1 1 0 8 0 lockfspl 48 473 0 472 1 0 1 1 0 8 0 sessionpl 112 44 0 33 1 0 1 1 0 8 0 pgrppl 48 88 0 77 1 0 1 1 0 8 0 ucredpl 96 3622 0 3611 1 0 1 1 0 8 0 zombiepl 144 3487 0 3487 2 1 1 1 0 8 1 processpl 896 3520 0 3487 4 0 4 4 0 8 0 procpl 632 10716 0 10673 6 1 5 5 0 8 0 srpgc 64 34 0 34 13 12 1 1 0 8 1 sosppl 128 153 0 153 14 14 0 1 0 8 0 sockpl 384 8430 0 8403 40 36 4 10 0 8 1 mcl64k 65536 265 0 0 34 28 6 34 0 8 1 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 20 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 10 0 0 1 0 1 1 0 8 0 mcl2k 2048 201 0 0 20 4 16 20 0 8 0 mtagpl 80 122 0 0 2 0 2 2 0 8 0 mbufpl 256 947 0 0 46 0 46 46 0 8 0 bufpl 256 15848 0 8790 442 0 442 442 0 8 0 anonpl 16 491299 0 468199 197 94 103 120 0 124 5 amapchunkpl 152 25427 0 25250 39 28 11 15 0 158 0 amappl16 192 21122 0 19759 184 112 72 92 0 8 0 amappl15 184 751 0 751 5 4 1 1 0 8 1 amappl14 176 1099 0 1088 1 0 1 1 0 8 0 amappl13 168 86 0 86 2 2 0 1 0 8 0 amappl12 160 327 0 323 2 1 1 1 0 8 0 amappl11 152 494 0 478 1 0 1 1 0 8 0 amappl10 144 234 0 227 1 0 1 1 0 8 0 amappl9 136 961 0 958 1 0 1 1 0 8 0 amappl8 128 665 0 614 2 0 2 2 0 8 0 amappl7 120 349 0 340 1 0 1 1 0 8 0 amappl6 112 447 0 436 1 0 1 1 0 8 0 amappl5 104 792 0 776 1 0 1 1 0 8 0 amappl4 96 3734 0 3697 1 0 1 1 0 8 0 amappl3 88 815 0 808 1 0 1 1 0 8 0 amappl2 80 26130 0 26053 3 1 2 3 0 8 0 amappl1 72 89300 0 88859 25 15 10 20 0 8 0 amappl 80 11437 0 11368 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 17 0 17 1 1 0 1 0 8 0 aobjpl 64 137 0 8 3 0 3 3 0 8 0 uaddrrnd 24 3555 0 3485 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3555 0 3485 1 0 1 1 0 8 0 vmmpekpl 168 36689 0 36645 3 0 3 3 0 8 0 vmmpepl 168 461947 0 459259 303 136 167 178 0 357 36 vmsppl 368 3500 0 3485 2 0 2 2 0 8 0 pdppl 4096 7117 0 7040 13 2 11 11 0 8 1 pvpl 32 1257582 0 1233777 379 143 236 253 0 265 29 pmappl 232 3554 0 3501 4 0 4 4 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 719 0 69 19 0 19 19 0 8 0