panic: unhandled af NUM
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syzbot
Jul 26, 2026, 6:16:29 AM (2 days ago) Jul 26
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: dd404cb12ba6 llvm: g/c-collect local changes for now-retir..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=16a546b9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=1f46c1a925c420e40420
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/deea85885126/disk-dd404cb1.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/4bbbb97e296d/bsd-dd404cb1.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/eb5d39c5b77e/kernel-dd404cb1.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1f46c1...@syzkaller.appspotmail.com
panic: unWhARanNdIlNGe:d SaPfL 48N
OT StLOoppWeEd RaEDt ON SYSCALL 91 20 EXIT 0 a
db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
154838 92978 32767 0x10000010 0 1 syz-executor
*410786 47186 0 0x14000 0x200 0 softnet0
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834e1ac7) at panic+0x1e5 sys/kern/subr_prf.c:198
unhandled_af(30) at unhandled_af+0x1a sys/net/if.c:-1
if_output_tso(ffff80000004e858,ffff80002a1cfdd0,ffff800000c43f10,fffff9006fb23dc0,5dc) at if_output_tso+0x22b
ip_output(fffff9006f6e3300,0,fffff9006fcce448,800,0,fffff9006fcce4e0,85732a7a7f1d018f) at ip_output+0x107b sys/netinet/ip_output.c:437
tcp_output(ffff8000015b85c0) at tcp_output+0x36e3 sys/netinet/tcp_output.c:1070
tcp_input_solocked(ffff80002a1d0220,ffff80002a1d022c,0,2,ffff80002a1d0218) at tcp_input_solocked+0x5a40 sys/netinet/tcp_input.c:2041
tcp_input_mlist(ffffffff83a9cf90,2) at tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1
if_input_process(ffff80000004e858,ffff80002a1d0308,0) at if_input_process+0x526 sys/net/if.c:1086
ifiq_process(ffff80000004ed08) at ifiq_process+0xcd sys/net/ifq.c:864
taskq_thread(ffff80000002c000) at taskq_thread+0x157 sys/kern/kern_task.c:446
end trace frame: 0x0, count: 4
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
*cpu0: unhandled af 48
ddb{0}> show kasan
No such command
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834e1ac7) at panic+0x1e5 sys/kern/subr_prf.c:198
unhandled_af(30) at unhandled_af+0x1a sys/net/if.c:-1
if_output_tso(ffff80000004e858,ffff80002a1cfdd0,ffff800000c43f10,fffff9006fb23dc0,5dc) at if_output_tso+0x22b
ip_output(fffff9006f6e3300,0,fffff9006fcce448,800,0,fffff9006fcce4e0,85732a7a7f1d018f) at ip_output+0x107b sys/netinet/ip_output.c:437
tcp_output(ffff8000015b85c0) at tcp_output+0x36e3 sys/netinet/tcp_output.c:1070
tcp_input_solocked(ffff80002a1d0220,ffff80002a1d022c,0,2,ffff80002a1d0218) at tcp_input_solocked+0x5a40 sys/netinet/tcp_input.c:2041
tcp_input_mlist(ffffffff83a9cf90,2) at tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1
if_input_process(ffff80000004e858,ffff80002a1d0308,0) at if_input_process+0x526 sys/net/if.c:1086
ifiq_process(ffff80000004ed08) at ifiq_process+0xcd sys/net/ifq.c:864
taskq_thread(ffff80000002c000) at taskq_thread+0x157 sys/kern/kern_task.c:446
end trace frame: 0x0, count: -11
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff80002a1cfbb0
rbx 0xffffffff8390de07 cpu_info_full_primary+0x2e07
rdx 0
rcx 0xffff800045ffea60
rax 0xffffffff8390cff0 cpu_info_full_primary+0x1ff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0x92eadd0b16641513
r11 0xf5c63940cbd910db
r12 0xffffffff8390dc08 cpu_info_full_primary+0x2c08
r13 0
r14 0
r15 0x1
rip 0xffffffff81b118a5 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80002a1cfba0
ss 0
db_enter+0x25: addq $0x8,%rsp
ddb{0}> show proc
PROC (softnet0) tid=410786 pid=47186 tcnt=1 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
runpri=32, usrpri=50, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800045ffe000,0xffff800045ffed08
process=0xffff800045ff9810 user=0xffff80002a1cb000, vmspace=0xffffffff83a219b8
estcpu=0, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
81269 272874 10974 32767 2 0x10 0 syz-executor
81269 105201 10974 32767 3 0x10 0x4000080 fsleep syz-executor
13101 497676 7214 32767 2 0x10 0 syz-executor
13101 48403 7214 32767 3 0x10 0x4000080 fsleep syz-executor
13101 35798 7214 32767 2 0x10 0x4000000 syz-executor
81680 397870 4220 32767 2 0x10 0 syz-executor
81680 263319 4220 32767 3 0x10 0x4000080 fsleep syz-executor
34378 315180 43596 32767 2 0x10 0 syz-executor
34378 178108 43596 32767 3 0x10 0x4000080 ttyin syz-executor
34378 130792 43596 32767 3 0x10 0x4000080 fsleep syz-executor
10064 461010 27460 32767 2 0x10 0 syz-executor
4220 724 62133 32767 2 0x10 0xc80 syz-executor
27460 103755 47551 32767 2 0x10 0xc80 syz-executor
10974 268113 44556 32767 2 0x10 0xc80 syz-executor
7214 190150 71575 32767 3 0x10 0x80 nanoslp syz-executor
43596 442683 29806 32767 2 0x10 0xc80 syz-executor
92978 154838 34476 32767 7 0x10000010 0 syz-executor
62133 372199 76209 0 3 0x2 0x80 wait syz-executor
44556 37454 76209 0 3 0x2 0x80 wait syz-executor
34476 426527 76209 0 3 0x2 0x80 wait syz-executor
71575 197834 76209 0 3 0x2 0x80 wait syz-executor
29806 454244 76209 0 3 0x2 0x80 wait syz-executor
47551 71026 76209 0 3 0x2 0x80 wait syz-executor
76209 134184 55841 0 3 0x2 0x80 nanoslp syz-executor
55841 304240 79446 0 3 0x100002 0x88 sigsusp ksh
79446 414217 61909 0 3 0x10 0x88 kqread sshd-session
61909 326189 38942 0 3 0x12 0x80 kqread sshd-session
68648 219709 1 0 3 0x100003 0x80 ttyin getty
38942 308953 1 0 3 0 0x88 kqread sshd
8774 126016 38219 73 3 0x1100010 0x80 kqread syslogd
38219 210982 1 0 3 0x100002 0x80 sbwait syslogd
92326 134085 1 0 3 0x100000 0x80 kqread resolvd
45559 231725 64167 77 3 0x100012 0x80 kqread dhcpleased
29460 439398 64167 77 3 0x100012 0x80 kqread dhcpleased
64167 227186 1 0 3 0 0x80 kqread dhcpleased
26421 14000 0 0 3 0x14000 0x200 bored smr
19626 50601 0 0 2 0x14000 0x200 zerothread
27641 192552 0 0 3 0x14000 0x200 aiodoned aiodoned
29238 355587 0 0 3 0x14000 0x200 syncer update
70932 245874 0 0 3 0x14000 0x200 cleaner cleaner
44880 223213 0 0 2 0x14000 0x200 reaper
71514 411408 0 0 3 0x14000 0x200 pgdaemon pagedaemon
7198 319532 0 0 3 0x14000 0x200 bored viomb
90222 445458 0 0 3 0x14000 0x40000200 acpi0 acpi0
93416 385554 0 0 3 0x14000 0x40000200 idle1
98005 337669 0 0 3 0x14000 0x200 bored softnet1
*47186 410786 0 0 7 0x14000 0x200 softnet0
15106 234606 0 0 3 0x14000 0x200 smrbar systqmp
83859 103009 0 0 3 0x14000 0x200 bored systq
43915 350765 0 0 3 0x14000 0x200 tmoslp softclockmp
9535 506303 0 0 3 0x14000 0x40000200 tmoslp softclock
42883 312580 0 0 3 0x14000 0x40000200 idle0
1 173656 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb{0}> show all locks
CPU 1:
exclusive mutex &pmap->pm_mtx r = 0 (0xfffff9006db0fe10)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487
#2 pmap_do_remove+0xa9 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_do_remove+0xa9 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline]
#2 pmap_do_remove+0xa9 sys/arch/amd64/amd64/pmap.c:1834
#3 uvm_unmap_kill_entry_withlock+0x269 sys/uvm/uvm_map.c:1869
#4 uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline]
#4 uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497
#5 exit1+0x71b sys/kern/kern_exit.c:260
#6 sys_exit+0x1a sys/kern/kern_exit.c:-1
#7 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#7 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#8 Xsyscall+0x128
Process 47186 (softnet0) thread 0xffff800045ffea60 (410786)
exclusive rwlock inet46 r = 0 (0xffff8000015a31d0)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2 in_pcbsolock+0xdb sys/netinet/in_pcb.c:631
#3 tcp_input_solocked+0xa9a sys/netinet/tcp_input.c:-1
#4 tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1
#5 if_input_process+0x526 sys/net/if.c:1086
#6 ifiq_process+0xcd sys/net/ifq.c:864
#7 taskq_thread+0x157 sys/kern/kern_task.c:446
#8 proc_trampoline+0x10
shared rwlock netlock r = 0 (0xffffffff83969490)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 if_input_process+0x1c9 sys/net/if.c:1061
#3 ifiq_process+0xcd sys/net/ifq.c:864
#4 taskq_thread+0x157 sys/kern/kern_task.c:446
#5 proc_trampoline+0x10
shared rwlock softnet0 r = 0 (0xffff80000002c078)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 taskq_thread+0x12a sys/kern/kern_task.c:442
#2 proc_trampoline+0x10
Process 15106 (systqmp) thread 0xffff800045ffe000 (234606)
shared rwlock systqmp r = 0 (0xffffffff838e4108)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 taskq_thread+0x12a sys/kern/kern_task.c:442
#2 proc_trampoline+0x10
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11069 12017K 12034K 166960K 12167 0
pcb 17 12K 12K 166960K 17 0
rtable 195 5K 7K 166960K 355 0
pf 27 16K 16K 166960K 31 0
ifaddr 34 6K 7K 166960K 44 0
ifgroup 42 1K 2K 166960K 50 0
sysctl 4 1K 9K 166960K 8 0
counters 66 36K 37K 166960K 70 0
ioctlops 0 0K 4K 166960K 39 0
iov 0 0K 8K 166960K 76 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1287 81K 81K 166960K 1640 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 7 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 1K 166960K 29 0
dirhash 12 2K 2K 166960K 15 0
ACPI 1734 201K 291K 166960K 11964 0
file desc 19 69K 121K 166960K 415 0
sigio 0 0K 0K 166960K 4 0
proc 58 99K 147K 166960K 518 0
subproc 54 3K 4K 166960K 216 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 37 0
in_multi 77 5K 7K 166960K 105 0
ether_multi 1 0K 0K 166960K 2 0
mrt 1 0K 0K 166960K 17 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 211 943K 943K 166960K 211 0
exec 0 0K 1K 166960K 385 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 213 150K 185K 166960K 5068 0
UVM aobj 18 2K 4K 166960K 20 0
pinsyscall 40 80K 109K 166960K 1495 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 13 0
NDP 9 0K 2K 166960K 27 0
temp 29 9118K 9134K 166960K 4443 0
kqueue 13 20K 28K 166960K 66 0
SYN cache 2 16K 16K 166960K 2 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 28 0 0 1 0 1 1 0 8 0
rtpcb 120 49 0 46 1 0 1 1 0 8 0
rtentry 176 112 0 23 6 0 6 6 0 8 0
unpcb 144 161 0 142 1 0 1 1 0 8 0
syncache 336 6 0 6 1 0 1 1 0 8 1
tcpcb 736 162 0 157 7 0 7 7 0 8 6
arp 136 18 0 4 1 0 1 1 0 8 0
ipq 40 3 0 0 1 0 1 1 0 8 0
ipqe 40 3 0 0 1 0 1 1 0 8 0
inpcb 328 385 0 376 7 0 7 7 0 8 6
ip6q 72 2 0 1 1 0 1 1 0 8 0
ip6af 40 2 0 2 1 1 0 1 0 8 0
nd6 152 25 0 6 1 0 1 1 0 8 0
kcovpl 48 24 0 18 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 468 0 44 30 1 29 30 0 8 0
art_table 40 469 0 44 5 0 5 5 0 8 0
art_node 32 112 0 22 1 0 1 1 0 8 0
sysvmsgpl 40 3 0 3 1 1 0 1 0 8 0
semapl 72 24 0 14 1 0 1 1 0 8 0
shmpl 112 17 0 2 1 0 1 1 0 8 0
dirhash 1024 19 0 2 3 0 3 3 0 8 0
dino2pl 256 2002 0 522 93 0 93 93 0 8 0
ffsino 296 2002 0 522 114 0 114 114 0 8 0
nchpl 144 2611 0 905 64 0 64 64 0 8 0
vnodes 216 2227 0 0 124 0 124 124 0 8 0
namei 1024 8609 0 8609 2 0 2 2 0 8 2
percpumem 16 51 0 2 1 0 1 1 0 8 0
kstatmem 264 25 0 4 2 0 2 2 0 8 0
scxspl 216 8091 0 8091 10 2 8 8 1 8 8
plimitpl 152 99 0 78 3 1 2 2 0 8 1
sigapl 424 674 0 625 7 0 7 7 0 8 1
knotepl 120 302 0 0 10 0 10 10 0 8 0
kqueuepl 224 87 0 78 1 0 1 1 0 8 0
pipepl 344 211 0 183 4 0 4 4 0 8 1
fdescpl 528 658 0 627 3 0 3 3 0 8 0
filepl 160 3681 0 3495 15 1 14 15 0 8 5
lockfpl 104 321 0 319 4 3 1 4 0 8 0
lockfspl 48 25 0 23 1 0 1 1 0 8 0
sessionpl 144 53 0 39 1 0 1 1 0 8 0
pgrppl 48 111 0 90 1 0 1 1 0 8 0
ucredpl 104 875 0 858 1 0 1 1 0 8 0
zombiepl 144 627 0 625 1 0 1 1 0 8 0
processpl 1232 674 0 625 5 0 5 5 0 8 1
procpl 664 1027 0 972 7 1 6 7 0 8 1
sosppl 176 3 0 3 1 0 1 1 0 8 1
sockpl 752 596 0 565 11 1 10 10 0 8 6
mcl64k 65536 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 132 0 0 17 0 17 17 0 8 0
mcl2k 2048 17 0 0 3 0 3 3 0 8 0
mextrefs 64 19 0 0 1 0 1 1 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 1195 0 0 75 0 75 75 0 8 0
bufpl 272 2558 0 102 164 0 164 164 0 8 0
anonpl 32 9273 0 0 75 0 75 75 0 247 0
amapchunkpl 152 15355 0 14912 29 2 27 29 0 158 8
amappl16 200 1786 0 1768 19 8 11 14 0 8 8
amappl15 192 4 0 4 1 1 0 1 0 8 0
amappl14 184 405 0 404 1 0 1 1 0 8 0
amappl13 176 111 0 101 1 0 1 1 0 8 0
amappl12 168 899 0 869 2 0 2 2 0 8 0
amappl11 160 3 0 3 1 1 0 1 0 8 0
amappl10 152 59 0 49 1 0 1 1 0 8 0
amappl9 144 268 0 268 1 1 0 1 0 8 0
amappl8 136 95 0 94 1 0 1 1 0 8 0
amappl7 128 136 0 124 1 0 1 1 0 8 0
amappl6 120 150 0 147 1 0 1 1 0 8 0
amappl5 112 94 0 86 1 0 1 1 0 8 0
amappl4 104 261 0 245 1 0 1 1 0 8 0
amappl3 96 2886 0 2779 5 1 4 4 0 8 0
amappl2 88 517 0 466 2 0 2 2 0 8 0
amappl1 80 11404 0 10860 15 2 13 15 0 8 0
amappl 88 4327 0 4177 5 0 5 5 0 92 0
uvmvnodes 80 106 0 0 3 0 3 3 0 8 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 19 0 2 1 0 1 1 0 8 0
uaddrrnd 24 658 0 627 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 658 0 627 1 0 1 1 0 8 0
vmmpekpl 168 7589 0 7542 3 0 3 3 0 8 0
vmmpepl 168 50349 0 48574 100 1 99 100 0 357 14
vmsppl 488 657 0 626 7 2 5 6 0 8 0
rwobjpl 80 16814 0 15916 25 0 25 25 0 8 1
pdppl 4096 1323 0 1252 117 40 77 95 0 8 6
pvpl 32 14864 0 0 120 0 120 120 0 265 0
pmappl 256 657 0 626 4 1 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 112 522 0 44 14 0 14 14 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834e1ac7) at panic+0x1e5 sys/kern/subr_prf.c:198
unhandled_af(30) at unhandled_af+0x1a sys/net/if.c:-1
if_output_tso(ffff80000004e858,ffff80002a1cfdd0,ffff800000c43f10,fffff9006fb23dc0,5dc) at if_output_tso+0x22b
ip_output(fffff9006f6e3300,0,fffff9006fcce448,800,0,fffff9006fcce4e0,85732a7a7f1d018f) at ip_output+0x107b sys/netinet/ip_output.c:437
tcp_output(ffff8000015b85c0) at tcp_output+0x36e3 sys/netinet/tcp_output.c:1070
tcp_input_solocked(ffff80002a1d0220,ffff80002a1d022c,0,2,ffff80002a1d0218) at tcp_input_solocked+0x5a40 sys/netinet/tcp_input.c:2041
tcp_input_mlist(ffffffff83a9cf90,2) at tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1
if_input_process(ffff80000004e858,ffff80002a1d0308,0) at if_input_process+0x526 sys/net/if.c:1086
ifiq_process(ffff80000004ed08) at ifiq_process+0xcd sys/net/ifq.c:864
taskq_thread(ffff80000002c000) at taskq_thread+0x157 sys/kern/kern_task.c:446
end trace frame: 0x0, count: -11
ddb{0}> machine ddbcpu 1
---
This report is generated by a bot. It may contain errors.
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: dd404cb12ba6 llvm: g/c-collect local changes for now-retir..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=16a546b9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=1f46c1a925c420e40420
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/deea85885126/disk-dd404cb1.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/4bbbb97e296d/bsd-dd404cb1.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/eb5d39c5b77e/kernel-dd404cb1.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1f46c1...@syzkaller.appspotmail.com
panic: unWhARanNdIlNGe:d SaPfL 48N
OT StLOoppWeEd RaEDt ON SYSCALL 91 20 EXIT 0 a
db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
154838 92978 32767 0x10000010 0 1 syz-executor
*410786 47186 0 0x14000 0x200 0 softnet0
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834e1ac7) at panic+0x1e5 sys/kern/subr_prf.c:198
unhandled_af(30) at unhandled_af+0x1a sys/net/if.c:-1
if_output_tso(ffff80000004e858,ffff80002a1cfdd0,ffff800000c43f10,fffff9006fb23dc0,5dc) at if_output_tso+0x22b
ip_output(fffff9006f6e3300,0,fffff9006fcce448,800,0,fffff9006fcce4e0,85732a7a7f1d018f) at ip_output+0x107b sys/netinet/ip_output.c:437
tcp_output(ffff8000015b85c0) at tcp_output+0x36e3 sys/netinet/tcp_output.c:1070
tcp_input_solocked(ffff80002a1d0220,ffff80002a1d022c,0,2,ffff80002a1d0218) at tcp_input_solocked+0x5a40 sys/netinet/tcp_input.c:2041
tcp_input_mlist(ffffffff83a9cf90,2) at tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1
if_input_process(ffff80000004e858,ffff80002a1d0308,0) at if_input_process+0x526 sys/net/if.c:1086
ifiq_process(ffff80000004ed08) at ifiq_process+0xcd sys/net/ifq.c:864
taskq_thread(ffff80000002c000) at taskq_thread+0x157 sys/kern/kern_task.c:446
end trace frame: 0x0, count: 4
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
*cpu0: unhandled af 48
ddb{0}> show kasan
No such command
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834e1ac7) at panic+0x1e5 sys/kern/subr_prf.c:198
unhandled_af(30) at unhandled_af+0x1a sys/net/if.c:-1
if_output_tso(ffff80000004e858,ffff80002a1cfdd0,ffff800000c43f10,fffff9006fb23dc0,5dc) at if_output_tso+0x22b
ip_output(fffff9006f6e3300,0,fffff9006fcce448,800,0,fffff9006fcce4e0,85732a7a7f1d018f) at ip_output+0x107b sys/netinet/ip_output.c:437
tcp_output(ffff8000015b85c0) at tcp_output+0x36e3 sys/netinet/tcp_output.c:1070
tcp_input_solocked(ffff80002a1d0220,ffff80002a1d022c,0,2,ffff80002a1d0218) at tcp_input_solocked+0x5a40 sys/netinet/tcp_input.c:2041
tcp_input_mlist(ffffffff83a9cf90,2) at tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1
if_input_process(ffff80000004e858,ffff80002a1d0308,0) at if_input_process+0x526 sys/net/if.c:1086
ifiq_process(ffff80000004ed08) at ifiq_process+0xcd sys/net/ifq.c:864
taskq_thread(ffff80000002c000) at taskq_thread+0x157 sys/kern/kern_task.c:446
end trace frame: 0x0, count: -11
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff80002a1cfbb0
rbx 0xffffffff8390de07 cpu_info_full_primary+0x2e07
rdx 0
rcx 0xffff800045ffea60
rax 0xffffffff8390cff0 cpu_info_full_primary+0x1ff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0x92eadd0b16641513
r11 0xf5c63940cbd910db
r12 0xffffffff8390dc08 cpu_info_full_primary+0x2c08
r13 0
r14 0
r15 0x1
rip 0xffffffff81b118a5 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80002a1cfba0
ss 0
db_enter+0x25: addq $0x8,%rsp
ddb{0}> show proc
PROC (softnet0) tid=410786 pid=47186 tcnt=1 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
runpri=32, usrpri=50, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800045ffe000,0xffff800045ffed08
process=0xffff800045ff9810 user=0xffff80002a1cb000, vmspace=0xffffffff83a219b8
estcpu=0, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
81269 272874 10974 32767 2 0x10 0 syz-executor
81269 105201 10974 32767 3 0x10 0x4000080 fsleep syz-executor
13101 497676 7214 32767 2 0x10 0 syz-executor
13101 48403 7214 32767 3 0x10 0x4000080 fsleep syz-executor
13101 35798 7214 32767 2 0x10 0x4000000 syz-executor
81680 397870 4220 32767 2 0x10 0 syz-executor
81680 263319 4220 32767 3 0x10 0x4000080 fsleep syz-executor
34378 315180 43596 32767 2 0x10 0 syz-executor
34378 178108 43596 32767 3 0x10 0x4000080 ttyin syz-executor
34378 130792 43596 32767 3 0x10 0x4000080 fsleep syz-executor
10064 461010 27460 32767 2 0x10 0 syz-executor
4220 724 62133 32767 2 0x10 0xc80 syz-executor
27460 103755 47551 32767 2 0x10 0xc80 syz-executor
10974 268113 44556 32767 2 0x10 0xc80 syz-executor
7214 190150 71575 32767 3 0x10 0x80 nanoslp syz-executor
43596 442683 29806 32767 2 0x10 0xc80 syz-executor
92978 154838 34476 32767 7 0x10000010 0 syz-executor
62133 372199 76209 0 3 0x2 0x80 wait syz-executor
44556 37454 76209 0 3 0x2 0x80 wait syz-executor
34476 426527 76209 0 3 0x2 0x80 wait syz-executor
71575 197834 76209 0 3 0x2 0x80 wait syz-executor
29806 454244 76209 0 3 0x2 0x80 wait syz-executor
47551 71026 76209 0 3 0x2 0x80 wait syz-executor
76209 134184 55841 0 3 0x2 0x80 nanoslp syz-executor
55841 304240 79446 0 3 0x100002 0x88 sigsusp ksh
79446 414217 61909 0 3 0x10 0x88 kqread sshd-session
61909 326189 38942 0 3 0x12 0x80 kqread sshd-session
68648 219709 1 0 3 0x100003 0x80 ttyin getty
38942 308953 1 0 3 0 0x88 kqread sshd
8774 126016 38219 73 3 0x1100010 0x80 kqread syslogd
38219 210982 1 0 3 0x100002 0x80 sbwait syslogd
92326 134085 1 0 3 0x100000 0x80 kqread resolvd
45559 231725 64167 77 3 0x100012 0x80 kqread dhcpleased
29460 439398 64167 77 3 0x100012 0x80 kqread dhcpleased
64167 227186 1 0 3 0 0x80 kqread dhcpleased
26421 14000 0 0 3 0x14000 0x200 bored smr
19626 50601 0 0 2 0x14000 0x200 zerothread
27641 192552 0 0 3 0x14000 0x200 aiodoned aiodoned
29238 355587 0 0 3 0x14000 0x200 syncer update
70932 245874 0 0 3 0x14000 0x200 cleaner cleaner
44880 223213 0 0 2 0x14000 0x200 reaper
71514 411408 0 0 3 0x14000 0x200 pgdaemon pagedaemon
7198 319532 0 0 3 0x14000 0x200 bored viomb
90222 445458 0 0 3 0x14000 0x40000200 acpi0 acpi0
93416 385554 0 0 3 0x14000 0x40000200 idle1
98005 337669 0 0 3 0x14000 0x200 bored softnet1
*47186 410786 0 0 7 0x14000 0x200 softnet0
15106 234606 0 0 3 0x14000 0x200 smrbar systqmp
83859 103009 0 0 3 0x14000 0x200 bored systq
43915 350765 0 0 3 0x14000 0x200 tmoslp softclockmp
9535 506303 0 0 3 0x14000 0x40000200 tmoslp softclock
42883 312580 0 0 3 0x14000 0x40000200 idle0
1 173656 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb{0}> show all locks
CPU 1:
exclusive mutex &pmap->pm_mtx r = 0 (0xfffff9006db0fe10)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487
#2 pmap_do_remove+0xa9 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_do_remove+0xa9 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline]
#2 pmap_do_remove+0xa9 sys/arch/amd64/amd64/pmap.c:1834
#3 uvm_unmap_kill_entry_withlock+0x269 sys/uvm/uvm_map.c:1869
#4 uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline]
#4 uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497
#5 exit1+0x71b sys/kern/kern_exit.c:260
#6 sys_exit+0x1a sys/kern/kern_exit.c:-1
#7 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#7 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#8 Xsyscall+0x128
Process 47186 (softnet0) thread 0xffff800045ffea60 (410786)
exclusive rwlock inet46 r = 0 (0xffff8000015a31d0)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2 in_pcbsolock+0xdb sys/netinet/in_pcb.c:631
#3 tcp_input_solocked+0xa9a sys/netinet/tcp_input.c:-1
#4 tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1
#5 if_input_process+0x526 sys/net/if.c:1086
#6 ifiq_process+0xcd sys/net/ifq.c:864
#7 taskq_thread+0x157 sys/kern/kern_task.c:446
#8 proc_trampoline+0x10
shared rwlock netlock r = 0 (0xffffffff83969490)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 if_input_process+0x1c9 sys/net/if.c:1061
#3 ifiq_process+0xcd sys/net/ifq.c:864
#4 taskq_thread+0x157 sys/kern/kern_task.c:446
#5 proc_trampoline+0x10
shared rwlock softnet0 r = 0 (0xffff80000002c078)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 taskq_thread+0x12a sys/kern/kern_task.c:442
#2 proc_trampoline+0x10
Process 15106 (systqmp) thread 0xffff800045ffe000 (234606)
shared rwlock systqmp r = 0 (0xffffffff838e4108)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 taskq_thread+0x12a sys/kern/kern_task.c:442
#2 proc_trampoline+0x10
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11069 12017K 12034K 166960K 12167 0
pcb 17 12K 12K 166960K 17 0
rtable 195 5K 7K 166960K 355 0
pf 27 16K 16K 166960K 31 0
ifaddr 34 6K 7K 166960K 44 0
ifgroup 42 1K 2K 166960K 50 0
sysctl 4 1K 9K 166960K 8 0
counters 66 36K 37K 166960K 70 0
ioctlops 0 0K 4K 166960K 39 0
iov 0 0K 8K 166960K 76 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1287 81K 81K 166960K 1640 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 7 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 1K 166960K 29 0
dirhash 12 2K 2K 166960K 15 0
ACPI 1734 201K 291K 166960K 11964 0
file desc 19 69K 121K 166960K 415 0
sigio 0 0K 0K 166960K 4 0
proc 58 99K 147K 166960K 518 0
subproc 54 3K 4K 166960K 216 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 37 0
in_multi 77 5K 7K 166960K 105 0
ether_multi 1 0K 0K 166960K 2 0
mrt 1 0K 0K 166960K 17 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 211 943K 943K 166960K 211 0
exec 0 0K 1K 166960K 385 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 213 150K 185K 166960K 5068 0
UVM aobj 18 2K 4K 166960K 20 0
pinsyscall 40 80K 109K 166960K 1495 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 13 0
NDP 9 0K 2K 166960K 27 0
temp 29 9118K 9134K 166960K 4443 0
kqueue 13 20K 28K 166960K 66 0
SYN cache 2 16K 16K 166960K 2 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 28 0 0 1 0 1 1 0 8 0
rtpcb 120 49 0 46 1 0 1 1 0 8 0
rtentry 176 112 0 23 6 0 6 6 0 8 0
unpcb 144 161 0 142 1 0 1 1 0 8 0
syncache 336 6 0 6 1 0 1 1 0 8 1
tcpcb 736 162 0 157 7 0 7 7 0 8 6
arp 136 18 0 4 1 0 1 1 0 8 0
ipq 40 3 0 0 1 0 1 1 0 8 0
ipqe 40 3 0 0 1 0 1 1 0 8 0
inpcb 328 385 0 376 7 0 7 7 0 8 6
ip6q 72 2 0 1 1 0 1 1 0 8 0
ip6af 40 2 0 2 1 1 0 1 0 8 0
nd6 152 25 0 6 1 0 1 1 0 8 0
kcovpl 48 24 0 18 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 468 0 44 30 1 29 30 0 8 0
art_table 40 469 0 44 5 0 5 5 0 8 0
art_node 32 112 0 22 1 0 1 1 0 8 0
sysvmsgpl 40 3 0 3 1 1 0 1 0 8 0
semapl 72 24 0 14 1 0 1 1 0 8 0
shmpl 112 17 0 2 1 0 1 1 0 8 0
dirhash 1024 19 0 2 3 0 3 3 0 8 0
dino2pl 256 2002 0 522 93 0 93 93 0 8 0
ffsino 296 2002 0 522 114 0 114 114 0 8 0
nchpl 144 2611 0 905 64 0 64 64 0 8 0
vnodes 216 2227 0 0 124 0 124 124 0 8 0
namei 1024 8609 0 8609 2 0 2 2 0 8 2
percpumem 16 51 0 2 1 0 1 1 0 8 0
kstatmem 264 25 0 4 2 0 2 2 0 8 0
scxspl 216 8091 0 8091 10 2 8 8 1 8 8
plimitpl 152 99 0 78 3 1 2 2 0 8 1
sigapl 424 674 0 625 7 0 7 7 0 8 1
knotepl 120 302 0 0 10 0 10 10 0 8 0
kqueuepl 224 87 0 78 1 0 1 1 0 8 0
pipepl 344 211 0 183 4 0 4 4 0 8 1
fdescpl 528 658 0 627 3 0 3 3 0 8 0
filepl 160 3681 0 3495 15 1 14 15 0 8 5
lockfpl 104 321 0 319 4 3 1 4 0 8 0
lockfspl 48 25 0 23 1 0 1 1 0 8 0
sessionpl 144 53 0 39 1 0 1 1 0 8 0
pgrppl 48 111 0 90 1 0 1 1 0 8 0
ucredpl 104 875 0 858 1 0 1 1 0 8 0
zombiepl 144 627 0 625 1 0 1 1 0 8 0
processpl 1232 674 0 625 5 0 5 5 0 8 1
procpl 664 1027 0 972 7 1 6 7 0 8 1
sosppl 176 3 0 3 1 0 1 1 0 8 1
sockpl 752 596 0 565 11 1 10 10 0 8 6
mcl64k 65536 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 132 0 0 17 0 17 17 0 8 0
mcl2k 2048 17 0 0 3 0 3 3 0 8 0
mextrefs 64 19 0 0 1 0 1 1 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 1195 0 0 75 0 75 75 0 8 0
bufpl 272 2558 0 102 164 0 164 164 0 8 0
anonpl 32 9273 0 0 75 0 75 75 0 247 0
amapchunkpl 152 15355 0 14912 29 2 27 29 0 158 8
amappl16 200 1786 0 1768 19 8 11 14 0 8 8
amappl15 192 4 0 4 1 1 0 1 0 8 0
amappl14 184 405 0 404 1 0 1 1 0 8 0
amappl13 176 111 0 101 1 0 1 1 0 8 0
amappl12 168 899 0 869 2 0 2 2 0 8 0
amappl11 160 3 0 3 1 1 0 1 0 8 0
amappl10 152 59 0 49 1 0 1 1 0 8 0
amappl9 144 268 0 268 1 1 0 1 0 8 0
amappl8 136 95 0 94 1 0 1 1 0 8 0
amappl7 128 136 0 124 1 0 1 1 0 8 0
amappl6 120 150 0 147 1 0 1 1 0 8 0
amappl5 112 94 0 86 1 0 1 1 0 8 0
amappl4 104 261 0 245 1 0 1 1 0 8 0
amappl3 96 2886 0 2779 5 1 4 4 0 8 0
amappl2 88 517 0 466 2 0 2 2 0 8 0
amappl1 80 11404 0 10860 15 2 13 15 0 8 0
amappl 88 4327 0 4177 5 0 5 5 0 92 0
uvmvnodes 80 106 0 0 3 0 3 3 0 8 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 19 0 2 1 0 1 1 0 8 0
uaddrrnd 24 658 0 627 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 658 0 627 1 0 1 1 0 8 0
vmmpekpl 168 7589 0 7542 3 0 3 3 0 8 0
vmmpepl 168 50349 0 48574 100 1 99 100 0 357 14
vmsppl 488 657 0 626 7 2 5 6 0 8 0
rwobjpl 80 16814 0 15916 25 0 25 25 0 8 1
pdppl 4096 1323 0 1252 117 40 77 95 0 8 6
pvpl 32 14864 0 0 120 0 120 120 0 265 0
pmappl 256 657 0 626 4 1 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 112 522 0 44 14 0 14 14 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834e1ac7) at panic+0x1e5 sys/kern/subr_prf.c:198
unhandled_af(30) at unhandled_af+0x1a sys/net/if.c:-1
if_output_tso(ffff80000004e858,ffff80002a1cfdd0,ffff800000c43f10,fffff9006fb23dc0,5dc) at if_output_tso+0x22b
ip_output(fffff9006f6e3300,0,fffff9006fcce448,800,0,fffff9006fcce4e0,85732a7a7f1d018f) at ip_output+0x107b sys/netinet/ip_output.c:437
tcp_output(ffff8000015b85c0) at tcp_output+0x36e3 sys/netinet/tcp_output.c:1070
tcp_input_solocked(ffff80002a1d0220,ffff80002a1d022c,0,2,ffff80002a1d0218) at tcp_input_solocked+0x5a40 sys/netinet/tcp_input.c:2041
tcp_input_mlist(ffffffff83a9cf90,2) at tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1
if_input_process(ffff80000004e858,ffff80002a1d0308,0) at if_input_process+0x526 sys/net/if.c:1086
ifiq_process(ffff80000004ed08) at ifiq_process+0xcd sys/net/ifq.c:864
taskq_thread(ffff80000002c000) at taskq_thread+0x157 sys/kern/kern_task.c:446
end trace frame: 0x0, count: -11
ddb{0}> machine ddbcpu 1
---
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