login: panic: acquiring blockable sleep lock with spinlock or critical section held (kernel_lock) &kernel_lock Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 372468 96779 0 0 0 1 syz-executor.0 *432002 96779 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 witness_checkorder(ffffffff8265f5f8,9,0) at witness_checkorder+0x10cc sys/kern/subr_witness.c:820 __mp_lock(ffffffff8265f3f0) at __mp_lock+0xa1 pageflttrap() at pageflttrap+0x6f sys/arch/amd64/amd64/trap.c:162 kerntrap(ffff800021b96bf0) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:287 alltraps_kern_meltdown(6,0,600,0,fffffd8007df6854,fffffd80667faf40) at alltraps_kern_meltdown+0x7b frag6_input(ffff800021b96f58,ffff800021b96f64,2c,18) at frag6_input+0x7d2 sys/netinet6/frag6.c:321 ip_deliver(ffff800021b96f58,ffff800021b96f64,2c,18) at ip_deliver+0x353 sys/netinet/ip_input.c:665 ip6_input_if(ffff800021b96f58,ffff800021b96f64,29,0,ffff80000066d000) at ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline] ip6_input_if(ffff800021b96f58,ffff800021b96f64,29,0,ffff80000066d000) at ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340 ipv6_input(ffff80000066d000,fffffd8069558c00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000066d000,fffffd8069558c00,18) at if_input_local+0x121 sys/net/if.c:783 ip6_output(fffffd806d722300,ffff800000a9bf00,fffffd806f6beb60,0,0,fffffd806f6beaf0) at ip6_output+0xd59 rip6_output(fffffd806d722300,fffffd80669f7918,ffff800021b972c8,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 end trace frame: 0xffff800021b97360, 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{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 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 witness_checkorder(ffffffff8265f5f8,9,0) at witness_checkorder+0x10cc sys/kern/subr_witness.c:820 __mp_lock(ffffffff8265f3f0) at __mp_lock+0xa1 pageflttrap() at pageflttrap+0x6f sys/arch/amd64/amd64/trap.c:162 kerntrap(ffff800021b96bf0) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:287 alltraps_kern_meltdown(6,0,600,0,fffffd8007df6854,fffffd80667faf40) at alltraps_kern_meltdown+0x7b frag6_input(ffff800021b96f58,ffff800021b96f64,2c,18) at frag6_input+0x7d2 sys/netinet6/frag6.c:321 ip_deliver(ffff800021b96f58,ffff800021b96f64,2c,18) at ip_deliver+0x353 sys/netinet/ip_input.c:665 ip6_input_if(ffff800021b96f58,ffff800021b96f64,29,0,ffff80000066d000) at ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline] ip6_input_if(ffff800021b96f58,ffff800021b96f64,29,0,ffff80000066d000) at ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340 ipv6_input(ffff80000066d000,fffffd8069558c00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000066d000,fffffd8069558c00,18) at if_input_local+0x121 sys/net/if.c:783 ip6_output(fffffd806d722300,ffff800000a9bf00,fffffd806f6beb60,0,0,fffffd806f6beaf0) at ip6_output+0xd59 rip6_output(fffffd806d722300,fffffd80669f7918,ffff800021b972c8,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd80669f7918,9,fffffd806d722300,0,0,ffff800020ab0c70) at rip6_usrreq+0x5cd sys/netinet6/raw_ip6.c:670 sosend(fffffd80669f7918,0,ffff800021b974f8,0,0,0) at sosend+0x668 sys/kern/uipc_socket.c:524 dofilewritev(ffff800020ab0c70,3,ffff800021b974f8,0,ffff800021b97600) at dofilewritev+0x1ac sys/kern/sys_generic.c:364 sys_write(ffff800020ab0c70,ffff800021b97598,ffff800021b97600) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff800021b97670) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800021b97670) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,c,0,3,100c6b3010) at Xsyscall+0x128 end of kernel end trace frame: 0x12bf9448d0, count: -20 ddb{0}> show registers rdi 0xffffffff81d56a37 db_enter+0x17 rsi 0x302e __ALIGN_SIZE+0x202e rbp 0xffff800021b96950 rbx 0xffff800021b96a00 rdx 0x302f __ALIGN_SIZE+0x202f rcx 0xffff800020b5c000 rax 0xffff800020b5c000 r8 0xffffffff812e94e3 kprintf+0x173 r9 0x1 r10 0x25 r11 0x16b06a1b1bf2cd40 r12 0x3000000008 r13 0xffff800021b96960 r14 0x100 r15 0x1 rip 0xffffffff81d56a38 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021b96940 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=432002 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab1b40,0xffffffff826641e8 process=0xffff800020adca80 user=0xffff800021b92000, vmspace=0xfffffd807f00b000 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 96779 372468 99791 0 7 0 syz-executor.0 *96779 432002 99791 0 7 0x4000000 syz-executor.0 16668 358460 29422 0 2 0x2 syz-executor.1 99791 151836 29422 0 3 0x82 nanosleep syz-executor.0 29422 204127 47931 0 3 0x82 thrsleep syz-fuzzer 29422 38630 47931 0 3 0x4000082 nanosleep syz-fuzzer 29422 53333 47931 0 3 0x4000082 thrsleep syz-fuzzer 29422 243116 47931 0 3 0x4000082 thrsleep syz-fuzzer 29422 296218 47931 0 3 0x4000082 thrsleep syz-fuzzer 29422 487580 47931 0 3 0x4000082 thrsleep syz-fuzzer 29422 374965 47931 0 3 0x4000082 thrsleep syz-fuzzer 29422 355462 47931 0 3 0x4000082 thrsleep syz-fuzzer 29422 1922 47931 0 3 0x4000082 thrsleep syz-fuzzer 29422 349484 47931 0 3 0x4000082 kqread syz-fuzzer 47931 168401 76451 0 3 0x10008a pause ksh 76451 464086 42607 0 3 0x92 select sshd 56413 225964 1 0 3 0x100083 ttyin getty 42607 420181 1 0 3 0x80 select sshd 24260 185935 50381 74 3 0x100092 bpf pflogd 50381 108485 1 0 3 0x80 netio pflogd 31391 145978 10596 73 3 0x100090 kqread syslogd 10596 349350 1 0 3 0x100082 netio syslogd 88273 33744 1 77 3 0x100090 poll dhclient 21007 473199 1 0 3 0x80 poll dhclient 49823 289274 0 0 3 0x14200 pgzero zerothread 59343 197852 0 0 3 0x14200 aiodoned aiodoned 7275 88537 0 0 3 0x14200 syncer update 4191 380155 0 0 3 0x14200 cleaner cleaner 41952 477071 0 0 3 0x14200 reaper reaper 44927 234447 0 0 3 0x14200 pgdaemon pagedaemon 97732 461671 0 0 3 0x14200 bored crynlk 79346 33311 0 0 3 0x14200 bored crypto 62024 91205 0 0 3 0x40014200 acpi0 acpi0 78306 391925 0 0 3 0x40014200 idle1 6078 464548 0 0 3 0x14200 bored softnet 18164 413174 0 0 3 0x14200 bored systqmp 10927 139311 0 0 3 0x14200 bored systq 87034 89525 0 0 3 0x40014200 bored softclock 37897 351470 0 0 3 0x40014200 idle0 94931 53733 0 0 3 0x14200 bored smr 1 203881 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex /syzkaller/managers/multicore/kernel/sys/netinet6/frag6.c:57 r = 0 (0xffffffff824bae40) #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 frag6_input+0x237 sys/netinet6/frag6.c:183 #4 ip_deliver+0x353 sys/netinet/ip_input.c:665 #5 ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline] #5 ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340 #6 ipv6_input+0x48 sys/netinet6/ip6_input.c:171 #7 if_input_local+0x121 sys/net/if.c:783 #8 ip6_output+0xd59 #9 rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 #10 rip6_usrreq+0x5cd sys/netinet6/raw_ip6.c:670 #11 sosend+0x668 sys/kern/uipc_socket.c:524 #12 dofilewritev+0x1ac sys/kern/sys_generic.c:364 #13 sys_write+0x83 sys/kern/sys_generic.c:284 #14 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #14 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #15 Xsyscall+0x128 Process 96779 (syz-executor.0) thread 0xffff800020ab0c70 (432002) exclusive rwlock netlock r = 0 (0xffffffff824c5488) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sosend+0x52c sys/kern/uipc_socket.c:512 #3 dofilewritev+0x1ac sys/kern/sys_generic.c:364 #4 sys_write+0x83 sys/kern/sys_generic.c:284 #5 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #5 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #6 Xsyscall+0x128 exclusive mutex /syzkaller/managers/multicore/kernel/sys/netinet6/frag6.c:57 r = 0 (0xffffffff824bae40) #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 frag6_input+0x237 sys/netinet6/frag6.c:183 #4 ip_deliver+0x353 sys/netinet/ip_input.c:665 #5 ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline] #5 ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340 #6 ipv6_input+0x48 sys/netinet6/ip6_input.c:171 #7 if_input_local+0x121 sys/net/if.c:783 #8 ip6_output+0xd59 #9 rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 #10 rip6_usrreq+0x5cd sys/netinet6/raw_ip6.c:670 #11 sosend+0x668 sys/kern/uipc_socket.c:524 #12 dofilewritev+0x1ac sys/kern/sys_generic.c:364 #13 sys_write+0x83 sys/kern/sys_generic.c:284 #14 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #14 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #15 Xsyscall+0x128 Process 16668 (syz-executor.1) thread 0xffff800020ab09f8 (358460) exclusive rrwlock inode r = 0 (0xfffffd806aee8818) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x13e sys/ufs/ffs/ffs_vfsops.c:1352 #5 ffs_inode_alloc+0x1cf sys/ufs/ffs/ffs_alloc.c:392 #6 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1164 #7 VOP_MKDIR+0xce sys/kern/vfs_vops.c:449 #8 domkdirat+0x121 sys/kern/vfs_syscalls.c:2983 #9 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #9 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b06af78) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:561 #5 vfs_lookup+0xec sys/kern/vfs_lookup.c:418 #6 namei+0x61c sys/kern/vfs_lookup.c:248 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:2968 #8 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #8 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9506 6402K 6918K 78643K 11187 0 0 pcb 14 8K 8K 78643K 45 0 0 rtable 108 4K 4K 78643K 238 0 0 ifaddr 55 12K 12K 78643K 71 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1477 0 0 iov 0 0K 16K 78643K 24 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 77K 78643K 1407 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 20 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 222 0 0 sigio 0 0K 0K 78643K 4 0 0 proc 53 50K 83K 78643K 420 0 0 subproc 32 2K 2K 78643K 34 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 14 0 0 in_multi 33 2K 2K 78643K 33 0 0 ether_multi 1 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 42 185K 185K 78643K 42 0 0 exec 0 0K 1K 78643K 219 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 89 20K 25K 78643K 1610 0 0 UVM aobj 6 2K 2K 78643K 6 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 2 0K 0K 78643K 26 0 0 NDP 11 0K 0K 78643K 19 0 0 temp 140 3545K 3612K 78643K 3952 0 0 kqueue 0 0K 0K 78643K 3 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 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 23 0 21 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 64 0 54 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 6271 0 6271 2 2 0 2 0 8 0 tcpcb 544 47 0 42 1 0 1 1 0 8 0 inpcb 280 137 0 129 1 0 1 1 0 8 0 ip6q 72 1 0 0 1 0 1 1 0 8 0 ip6af 48 1 0 0 1 0 1 1 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 ppxss 1128 2 0 2 1 0 1 1 0 8 1 pffrag 232 1 0 1 1 0 1 1 0 482 1 pffrnode 88 1 0 1 1 0 1 1 0 8 1 pffrent 40 2 0 2 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 21 0 3 1 0 1 1 0 8 0 pfstkey 112 21 0 3 1 0 1 1 0 8 0 pfstate 328 21 0 3 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 256 189 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 sysvmsgpl 40 6 0 3 1 0 1 1 0 8 0 semapl 112 18 0 8 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1743 0 318 47 0 47 47 0 8 0 ffsino 272 1743 0 318 96 0 96 96 0 8 0 nchpl 144 2238 0 593 62 0 62 62 0 8 0 uvmvnodes 72 1926 0 0 36 0 36 36 0 8 0 vnodes 200 1926 0 0 102 0 102 102 0 8 0 namei 1024 6238 0 6237 2 1 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 5842 0 5842 8 7 1 7 0 8 1 plimitpl 152 31 0 23 1 0 1 1 0 8 0 sigapl 432 422 0 407 3 1 2 3 0 8 0 futexpl 56 2561 0 2561 1 0 1 1 0 8 1 knotepl 112 111 0 92 1 0 1 1 0 8 0 kqueuepl 104 50 0 48 1 0 1 1 0 8 0 pipepl 112 226 0 207 1 0 1 1 0 8 0 fdescpl 488 423 0 407 3 0 3 3 0 8 0 filepl 152 2195 0 2095 6 1 5 5 0 8 1 lockfpl 104 91 0 91 2 1 1 1 0 8 1 lockfspl 48 34 0 34 2 1 1 1 0 8 1 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 96 256 0 247 1 0 1 1 0 8 0 zombiepl 144 407 0 407 2 1 1 1 0 8 1 processpl 896 438 0 407 4 0 4 4 0 8 0 procpl 632 853 0 812 4 0 4 4 0 8 0 sockpl 384 230 0 210 4 1 3 3 0 8 0 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 5 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 235 0 0 29 0 29 29 0 8 0 mtagpl 80 4 0 0 1 0 1 1 0 8 0 mbufpl 256 283 0 0 17 0 17 17 0 8 0 bufpl 256 6032 0 1166 305 0 305 305 0 8 0 anonpl 16 52484 0 40219 67 1 66 66 0 124 16 amapchunkpl 152 2240 0 2132 8 1 7 7 0 158 0 amappl16 192 1866 0 1194 45 3 42 45 0 8 8 amappl14 176 50 0 45 1 0 1 1 0 8 0 amappl13 168 199 0 195 1 0 1 1 0 8 0 amappl12 160 8 0 8 1 1 0 1 0 8 0 amappl11 152 60 0 45 1 0 1 1 0 8 0 amappl10 144 71 0 68 1 0 1 1 0 8 0 amappl9 136 608 0 604 1 0 1 1 0 8 0 amappl8 128 146 0 129 1 0 1 1 0 8 0 amappl7 120 35 0 31 1 0 1 1 0 8 0 amappl6 112 58 0 50 1 0 1 1 0 8 0 amappl5 104 132 0 118 1 0 1 1 0 8 0 amappl4 96 780 0 743 2 1 1 2 0 8 0 amappl3 88 174 0 164 1 0 1 1 0 8 0 amappl2 80 2453 0 2382 3 1 2 3 0 8 0 amappl1 72 18933 0 18503 24 14 10 19 0 8 0 amappl 80 1106 0 1069 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 dma64 64 259 0 259 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 5 0 0 1 0 1 1 0 8 0 uaddrrnd 24 423 0 407 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 423 0 407 1 0 1 1 0 8 0 vmmpekpl 168 7130 0 7098 2 0 2 2 0 8 0 vmmpepl 168 57554 0 55770 122 29 93 98 0 357 10 vmsppl 368 422 0 407 2 0 2 2 0 8 0 pdppl 4096 853 0 814 7 1 6 6 0 8 0 pvpl 32 169916 0 154510 173 13 160 160 0 265 34 pmappl 232 422 0 407 2 1 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 483 0 5 14 0 14 14 0 8 0