login: panic: WAaRcNqIuNirGi:n g SPbLl NoOcT kLaObWlEReE Ds lOeNe pSY SloCcAkL Lwi 2 t15h7 s79p3i4n4l5o0c kEX IorT 0c rai t iStopped at savectx+0xb1: movl $0,%gs:0x530 TID PID UID PRFLAGS PFLAGS CPU COMMAND *210227 3166 0 0x2 0 0 syz-executor.1 348508 13235 0 0x12 0 1 sshd savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffc6a50, 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 acquiring blockable sleep lock with spinlock or critical section held (kernel_lock) &kernel_lock ddb{0}> trace savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffc6a50, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800022da9db0 rbx 0 rdx 0xffff800020ad69f8 rcx 0 rax 0x3a r8 0xffffffff818f616f kprintf+0x16f r9 0x1 r10 0x25 r11 0xfc4633967e4c1b70 r12 0 r13 0 r14 0xffff800020ad69f8 r15 0 rip 0xffffffff81eea3f1 savectx+0xb1 cs 0x8 rflags 0x46 rsp 0xffff800022da9d30 ss 0x10 savectx+0xb1: movl $0,%gs:0x530 ddb{0}> show proc PROC (syz-executor.1) pid=210227 stat=onproc flags process=2 proc=0 pri=57, usrpri=57, nice=20 forw=0xffffffffffffffff, list=0xffff800020ad6290,0xffff800020ad6ef8 process=0xffff800020af4380 user=0xffff800022da4000, vmspace=0xfffffd807f000a10 estcpu=36, cpticks=1, pctcpu=0.4 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 76774 234294 3166 0 2 0 syz-executor.1 * 3166 210227 31580 0 7 0x2 syz-executor.1 57348 136453 31580 0 3 0x2 biowait syz-executor.0 31580 461086 45755 0 3 0x82 thrsleep syz-fuzzer 31580 49968 45755 0 3 0x4000082 nanosleep syz-fuzzer 31580 272184 45755 0 3 0x4000082 thrsleep syz-fuzzer 31580 230596 45755 0 3 0x4000082 thrsleep syz-fuzzer 31580 39504 45755 0 3 0x4000082 thrsleep syz-fuzzer 31580 86352 45755 0 2 0x4000082 syz-fuzzer 31580 188532 45755 0 3 0x4000082 thrsleep syz-fuzzer 31580 261832 45755 0 3 0x4000082 thrsleep syz-fuzzer 31580 147840 45755 0 3 0x4000082 thrsleep syz-fuzzer 31580 18987 45755 0 2 0x4000002 syz-fuzzer 45755 92764 13235 0 3 0x10008a pause ksh 13235 348508 73319 0 7 0x12 sshd 37576 167007 1 0 3 0x100083 ttyin getty 73319 63108 1 0 3 0x80 select sshd 93397 150514 74699 74 3 0x100092 bpf pflogd 74699 149558 1 0 3 0x80 netio pflogd 29636 72074 28747 73 3 0x100090 kqread syslogd 28747 119773 1 0 3 0x100082 netio syslogd 98942 434619 1 77 3 0x100090 poll dhclient 79894 313183 1 0 3 0x80 poll dhclient 67970 414989 0 0 2 0x14200 zerothread 3171 9150 0 0 3 0x14200 aiodoned aiodoned 72129 199524 0 0 3 0x14200 syncer update 25412 165980 0 0 3 0x14200 cleaner cleaner 61707 38587 0 0 3 0x14200 reaper reaper 93768 391269 0 0 3 0x14200 pgdaemon pagedaemon 95484 163400 0 0 3 0x14200 bored crynlk 46082 385368 0 0 3 0x14200 bored crypto 38622 120205 0 0 3 0x40014200 acpi0 acpi0 13123 190228 0 0 3 0x40014200 idle1 37826 311148 0 0 2 0x14200 softnet 52772 128701 0 0 3 0x14200 bored systqmp 51482 359344 0 0 3 0x14200 bored systq 29868 19403 0 0 3 0x40014200 bored softclock 43009 404929 0 0 3 0x40014200 idle0 54686 258696 0 0 3 0x14200 bored smr 1 386027 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive sched_lock &sched_lock r = 1 (0xffffffff826567a8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 wakeup_n+0x37 sys/kern/kern_synch.c:569 #2 uvm_pmr_getpages+0xd80 sys/uvm/uvm_pmemrange.c:1172 #3 uvm_pglistalloc+0x362 sys/uvm/uvm_page.c:790 #4 uvm_km_kmemalloc_pla+0x238 sys/uvm/uvm_km.c:366 #5 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274 #6 fork1+0x295 sys/kern/kern_fork.c:365 #7 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #7 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #8 Xsyscall+0x128 exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff82628fd0) #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 uvm_pmr_getpages+0xd2c sys/uvm/uvm_pmemrange.c:1170 #4 uvm_pglistalloc+0x362 sys/uvm/uvm_page.c:790 #5 uvm_km_kmemalloc_pla+0x238 sys/uvm/uvm_km.c:366 #6 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274 #7 fork1+0x295 sys/kern/kern_fork.c:365 #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 CPU 1: exclusive mutex mbufpl r = 0 (0xffffffff82652d78) #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_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] #4 m_copym+0x174 sys/kern/uipc_mbuf.c:667 #5 tcp_output+0x15ba sys/netinet/tcp_output.c:673 #6 tcp_usrreq+0xa55 #7 sosend+0x671 sys/kern/uipc_socket.c:549 #8 dofilewritev+0x1b7 sys/kern/sys_generic.c:364 #9 sys_write+0x83 sys/kern/sys_generic.c:284 #10 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #10 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #11 Xsyscall+0x128 Process 3166 (syz-executor.1) thread 0xffff800020ad69f8 (210227) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82655880) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:83 [inline] #1 syscall+0x400 sys/arch/amd64/amd64/trap.c:570 #2 Xsyscall+0x128 exclusive sched_lock &sched_lock r = 1 (0xffffffff826567a8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 wakeup_n+0x37 sys/kern/kern_synch.c:569 #2 uvm_pmr_getpages+0xd80 sys/uvm/uvm_pmemrange.c:1172 #3 uvm_pglistalloc+0x362 sys/uvm/uvm_page.c:790 #4 uvm_km_kmemalloc_pla+0x238 sys/uvm/uvm_km.c:366 #5 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274 #6 fork1+0x295 sys/kern/kern_fork.c:365 #7 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #7 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #8 Xsyscall+0x128 exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff82628fd0) #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 uvm_pmr_getpages+0xd2c sys/uvm/uvm_pmemrange.c:1170 #4 uvm_pglistalloc+0x362 sys/uvm/uvm_page.c:790 #5 uvm_km_kmemalloc_pla+0x238 sys/uvm/uvm_km.c:366 #6 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274 #7 fork1+0x295 sys/kern/kern_fork.c:365 #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 Process 57348 (syz-executor.0) thread 0xffff800020ad6290 (136453) exclusive rrwlock inode r = 0 (0xfffffd80653e6920) #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 (0xfffffd806ac935e8) #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 Process 13235 (sshd) thread 0xffff800020ad9b38 (348508) exclusive rwlock netlock r = 0 (0xffffffff824e9568) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sosend+0x559 sys/kern/uipc_socket.c:537 #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:570 #6 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9478 6401K 6592K 78643K 10629 0 pcb 13 8K 8K 78643K 27 0 rtable 105 3K 3K 78643K 211 0 ifaddr 49 11K 11K 78643K 59 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1473 0 iov 0 0K 12K 78643K 8 0 mount 1 1K 1K 78643K 1 0 vnodes 1218 77K 77K 78643K 1236 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 5 0K 0K 78643K 6 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 5 13K 25K 78643K 64 0 proc 60 63K 95K 78643K 444 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 4 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 31 148K 148K 78643K 31 0 exec 0 0K 1K 78643K 209 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 113 54K 54K 78643K 1127 0 UVM aobj 4 2K 2K 78643K 4 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 7 0K 0K 78643K 12 0 temp 74 3012K 3076K 78643K 4201 0 kqueue 3 4K 6K 78643K 4 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 21 0 19 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 111 0 101 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 150 0 150 1 0 1 1 0 8 1 tcpcb 544 12 0 8 1 0 1 1 0 8 0 inpcb 280 98 0 91 2 0 2 2 0 8 1 nd6 48 4 0 0 1 0 1 1 0 8 0 pffrag 232 4 0 4 1 0 1 1 0 482 1 pffrnode 88 4 0 4 1 0 1 1 0 8 1 pffrent 40 54 0 54 1 0 1 1 0 8 1 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 17 0 0 1 0 1 1 0 8 0 pfstkey 112 17 0 0 1 0 1 1 0 8 0 pfstate 328 17 0 0 2 0 2 2 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 sysvmsgpl 40 2 0 2 1 0 1 1 0 8 1 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 4 0 1 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1476 0 67 46 0 46 46 0 8 0 ffsino 272 1476 0 67 95 0 95 95 0 8 0 nchpl 144 1752 0 132 61 0 61 61 0 8 0 uvmvnodes 72 1534 0 0 28 0 28 28 0 8 0 vnodes 208 1534 0 0 81 0 81 81 0 8 0 namei 1024 4548 0 4548 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 3 0 0 1 0 1 1 0 8 0 vmpool 560 3 0 0 1 0 1 1 0 8 0 scxspl 192 4955 0 4954 8 1 7 7 0 8 6 plimitpl 152 19 0 11 1 0 1 1 0 8 0 sigapl 432 263 0 248 3 0 3 3 0 8 1 futexpl 56 633 0 633 1 0 1 1 0 8 1 knotepl 112 54 0 35 1 0 1 1 0 8 0 kqueuepl 104 8 0 6 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 496 264 0 248 3 0 3 3 0 8 0 filepl 152 1473 0 1373 5 0 5 5 0 8 1 lockfpl 104 23 0 22 1 0 1 1 0 8 0 lockfspl 48 8 0 7 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 71 0 62 1 0 1 1 0 8 0 zombiepl 144 248 0 248 1 0 1 1 0 8 1 processpl 896 279 0 248 4 0 4 4 0 8 0 procpl 632 363 0 323 5 0 5 5 0 8 1 sockpl 400 231 0 212 5 0 5 5 0 8 3 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 6 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 162 0 0 20 0 20 20 0 8 0 mtagpl 80 2 0 0 1 0 1 1 0 8 0 mbufpl 256 196 0 0 12 0 12 12 0 8 0 bufpl 280 6381 0 1340 361 0 361 361 0 8 0 anonpl 16 39525 0 25246 60 1 59 59 0 125 1 amapchunkpl 152 1225 0 1090 7 0 7 7 0 158 1 amappl16 192 991 0 227 40 0 40 40 0 8 1 amappl15 184 58 0 54 1 0 1 1 0 8 0 amappl14 176 30 0 28 1 0 1 1 0 8 0 amappl13 168 11 0 9 1 0 1 1 0 8 0 amappl12 160 13 0 9 2 1 1 1 0 8 0 amappl11 152 84 0 67 1 0 1 1 0 8 0 amappl10 144 17 0 11 1 0 1 1 0 8 0 amappl9 136 619 0 614 1 0 1 1 0 8 0 amappl8 128 129 0 108 1 0 1 1 0 8 0 amappl7 120 106 0 93 1 0 1 1 0 8 0 amappl6 112 69 0 63 1 0 1 1 0 8 0 amappl5 104 133 0 118 1 0 1 1 0 8 0 amappl4 96 509 0 479 1 0 1 1 0 8 0 amappl3 88 113 0 105 1 0 1 1 0 8 0 amappl2 80 1199 0 1133 3 1 2 3 0 8 0 amappl1 72 15966 0 15526 26 13 13 21 0 8 3 amappl 80 609 0 564 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 267 0 248 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 267 0 248 1 0 1 1 0 8 0 vmmpekpl 168 5985 0 5955 2 0 2 2 0 8 0 vmmpepl 168 39904 0 37983 120 8 112 112 0 357 24 vmsppl 368 266 0 248 2 0 2 2 0 8 0 pdppl 4096 541 0 499 6 0 6 6 0 8 0 pvpl 32 138594 0 121243 150 1 149 149 0 265 7 pmappl 232 266 0 248 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 168 0 3 5 0 5 5 0 8 0