syzbot


panic: m_copydata: null mbuf (2)

Status: fixed on 2022/05/23 22:08
Reported-by: syzbot+91abd3aa2fdfe900f9ce@syzkaller.appspotmail.com
Fix commit: 0271abd8e494 In pf the kernel paniced if IP options in packet within ICMP payload were truncated. Drop such packets instead. Reported-by: syzbot+91abd3aa2fdfe900f9ce@syzkaller.appspotmail.com OK sashan@ claudio@
First crash: 190d, last: 190d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd panic: m_copydata: null mbuf C 396 937d 1124d 3/3 fixed on 2020/05/07 01:54

Sample crash report:
panic: m_copydata: null mbuf
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*448819  38942      0           0          0    1K syz-executor.0
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff82646cb3) at panic+0x177 sys/kern/subr_prf.c:202
m_copydata(fffffd80750fc500,30,1c,ffff8000212014b0) at m_copydata+0x140 sys/kern/uipc_mbuf.c:723
pf_walk_option(ffff800021201680,30,30,4c,ffff80002120190e) at pf_walk_option+0x64
pf_walk_header(ffff800021201680,ffff800021201630,ffff80002120190e) at pf_walk_header+0x180 sys/net/pf.c:6443
pf_test_state_icmp(ffff800021201800,ffff800021201900,ffff80002120190e) at pf_test_state_icmp+0x4a1 sys/net/pf.c:5231
pf_test(2,1,ffff800000bbc000,ffff800021201a28) at pf_test+0xc45 sys/net/pf.c:7127
ip_input_if(ffff800021201a28,ffff800021201a34,4,0,ffff800000bbc000) at ip_input_if+0x126 sys/netinet/ip_input.c:403
ipv4_input(ffff800000bbc000,fffffd80750fc500) at ipv4_input+0x48 sys/netinet/ip_input.c:277
ether_input(ffff800000bbc000,fffffd80750fc500) at ether_input+0x573
tun_dev_write(5d00,ffff800021201d98,11,2) at tun_dev_write+0x203 sys/net/if_tun.c:903
spec_write(ffff800021201bf0) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e5c3768,ffff800021201d98,11,fffffd807f7d7900) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
vn_write(fffffd806e5e9ac0,ffff800021201d98,0) at vn_write+0x157 sys/kern/vfs_vnops.c:414
end trace frame: 0xffff800021201d80, 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{1}> 
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: m_copydata: null mbuf
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff82646cb3) at panic+0x177 sys/kern/subr_prf.c:202
m_copydata(fffffd80750fc500,30,1c,ffff8000212014b0) at m_copydata+0x140 sys/kern/uipc_mbuf.c:723
pf_walk_option(ffff800021201680,30,30,4c,ffff80002120190e) at pf_walk_option+0x64
pf_walk_header(ffff800021201680,ffff800021201630,ffff80002120190e) at pf_walk_header+0x180 sys/net/pf.c:6443
pf_test_state_icmp(ffff800021201800,ffff800021201900,ffff80002120190e) at pf_test_state_icmp+0x4a1 sys/net/pf.c:5231
pf_test(2,1,ffff800000bbc000,ffff800021201a28) at pf_test+0xc45 sys/net/pf.c:7127
ip_input_if(ffff800021201a28,ffff800021201a34,4,0,ffff800000bbc000) at ip_input_if+0x126 sys/netinet/ip_input.c:403
ipv4_input(ffff800000bbc000,fffffd80750fc500) at ipv4_input+0x48 sys/netinet/ip_input.c:277
ether_input(ffff800000bbc000,fffffd80750fc500) at ether_input+0x573
tun_dev_write(5d00,ffff800021201d98,11,2) at tun_dev_write+0x203 sys/net/if_tun.c:903
spec_write(ffff800021201bf0) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e5c3768,ffff800021201d98,11,fffffd807f7d7900) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
vn_write(fffffd806e5e9ac0,ffff800021201d98,0) at vn_write+0x157 sys/kern/vfs_vnops.c:414
dofilewritev(ffff8000fffeed20,c8,ffff800021201d98,0,ffff800021201e90) at dofilewritev+0x19c sys/kern/sys_generic.c:381
sys_write(ffff8000fffeed20,ffff800021201e30,ffff800021201e90) at sys_write+0x83 sys/kern/sys_generic.c:301
syscall(ffff800021201f00) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800021201f00) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe6b40, count: -18
ddb{1}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff800021201390
rbx               0xffff800020ce9c5f
rdx                            0x3fd
rcx                                0
rax                             0x1d
r8                 0x101010101010101
r9                0x8080808080808080
r10               0x579d7d13258032ab
r11               0x249476c69fdcf686
r12               0xffff800020ce9a60
r13                                0
r14                                0
r15                              0x1
rip               0xffffffff8215c888    db_enter+0x18
cs                               0x8
rflags                         0x246
rsp               0xffff800021201380
ss                              0x10
db_enter+0x18:  addq    $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.0) pid=448819 stat=onproc
    flags process=0 proc=0
    pri=50, usrpri=50, nice=20
    forw=0xffffffffffffffff, list=0xffff8000fffefce0,0xffffffff82b2e9a0
    process=0xffff8000ffff90a8 user=0xffff8000211fc000, vmspace=0xfffffd806ee61a18
    estcpu=36, cpticks=0, pctcpu=0.0
    user=0, sys=0, intr=0
ddb{1}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
*38942  448819  92149      0  7           0                syz-executor.0
 92149  249504  84863      0  3        0x82  nanoslp       syz-executor.0
 84863   20267   2253      0  3        0x82  thrsleep      syz-execprog
 84863  274152   2253      0  3   0x4000082  nanoslp       syz-execprog
 84863  131295   2253      0  3   0x4000082  nanoslp       syz-execprog
 84863  145458   2253      0  3   0x4000082  thrsleep      syz-execprog
 84863  159323   2253      0  3   0x4000082  thrsleep      syz-execprog
 84863  235046   2253      0  3   0x4000082  thrsleep      syz-execprog
 84863   54393   2253      0  3   0x4000082  kqread        syz-execprog
 84863  136321   2253      0  3   0x4000082  thrsleep      syz-execprog
 84863  222928   2253      0  3   0x4000082  thrsleep      syz-execprog
  2253  518417  21862      0  3    0x10008a  sigsusp       ksh
 21862  367728  19207      0  3        0x9a  kqread        sshd
 13273  109750      1      0  3    0x100083  ttyin         getty
 19207  481986      1      0  3        0x88  kqread        sshd
 39325  349803  27941     74  3   0x1100092  bpf           pflogd
 27941  516227      1      0  3        0x80  netio         pflogd
 85005  507459  10541     73  3   0x1100090  kqread        syslogd
 10541  316263      1      0  3    0x100082  netio         syslogd
 59381  318471      1      0  3    0x100080  kqread        resolvd
 26722   90094  44434     77  3    0x100092  kqread        dhcpleased
 27572  223046  44434     77  3    0x100092  kqread        dhcpleased
 44434   58236      1      0  3        0x80  kqread        dhcpleased
 69897   58335      0      0  3     0x14200  bored         smr
 10242  392279      0      0  3     0x14200  pgzero        zerothread
  9108   69280      0      0  3     0x14200  aiodoned      aiodoned
 74057   92634      0      0  3     0x14200  syncer        update
 23223  193622      0      0  3     0x14200  cleaner       cleaner
 64221   64710      0      0  3     0x14200  reaper        reaper
 36965  324970      0      0  3     0x14200  pgdaemon      pagedaemon
 14595  334107      0      0  3     0x14200  bored         viomb
 14592  402606      0      0  3  0x40014200  acpi0         acpi0
 76010  401174      0      0  3  0x40014200                idle1
 43013   42531      0      0  3     0x14200  bored         softnet
 62357  319492      0      0  3     0x14200  bored         softnet
 45652  241710      0      0  3     0x14200  bored         softnet
 20088  466332      0      0  3     0x14200  bored         softnet
 75336   16884      0      0  3     0x14200  bored         systqmp
 43178   25754      0      0  3     0x14200  bored         systq
 53455  371156      0      0  3  0x40014200  bored         softclock
 25735  277823      0      0  7  0x40014200                idle0
     1  327655      0      0  3        0x82  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb{1}> show all locks
Process 38942 (syz-executor.0) thread 0xffff8000fffeed20 (448819)
shared rwlock pf_state_lock r = 0 (0xffffffff82947700)
#0  witness_lock+0x44d
#1  pf_test+0xc31
#2  ip_input_if+0x126 sys/netinet/ip_input.c:403
#3  ipv4_input+0x48 sys/netinet/ip_input.c:277
#4  ether_input+0x573
#5  tun_dev_write+0x203 sys/net/if_tun.c:903
#6  spec_write+0xd4 sys/kern/spec_vnops.c:309
#7  VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
#8  vn_write+0x157 sys/kern/vfs_vnops.c:414
#9  dofilewritev+0x19c sys/kern/sys_generic.c:381
#10 sys_write+0x83 sys/kern/sys_generic.c:301
#11 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#11 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#12 Xsyscall+0x128
exclusive rwlock netlock r = 0 (0xffffffff829cc640)
#0  witness_lock+0x44d
#1  tun_dev_write+0x1f8 sys/net/if_tun.c:902
#2  spec_write+0xd4 sys/kern/spec_vnops.c:309
#3  VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
#4  vn_write+0x157 sys/kern/vfs_vnops.c:414
#5  dofilewritev+0x19c sys/kern/sys_generic.c:381
#6  sys_write+0x83 sys/kern/sys_generic.c:301
#7  syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7  syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#8  Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82a9dbf0)
#0  witness_lock+0x44d
#1  vn_write+0x42 sys/kern/vfs_vnops.c:399
#2  dofilewritev+0x19c sys/kern/sys_generic.c:381
#3  sys_write+0x83 sys/kern/sys_generic.c:301
#4  syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#4  syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#5  Xsyscall+0x128
ddb{1}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 10155   6458K    6458K  78643K     11245        0
            pcb    13      8K       8K  78643K        13        0
         rtable    80      2K       2K  78643K       138        0
         ifaddr    37      9K       9K  78643K        40        0
       counters    42     33K      33K  78643K        42        0
       ioctlops     0      0K       4K  78643K      1480        0
          mount     1      1K       1K  78643K         1        0
            log     0      0K       0K  78643K         5        0
         vnodes  1167     73K      73K  78643K      1180        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     3      8K      12K  78643K        18        0
           proc    67     91K     103K  78643K       310        0
    NFS srvsock     1      0K       0K  78643K         1        0
     NFS daemon     1     16K      16K  78643K         1        0
       in_multi    22      1K       1K  78643K        22        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       2K  78643K       481        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     7     26K      26K  78643K         7        0
       UVM amap   100     14K      14K  78643K      1757        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     7      0K       0K  78643K         7        0
           temp    28   4717K    4781K  78643K      2812        0
         kqueue    12     18K      18K  78643K        25        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       19    0       16     1     0     1     1     0     8    0
rtentry    112       34    0        1     1     0     1     1     0     8    0
unpcb      136       35    0       20     1     0     1     1     0     8    0
syncache   296        5    0        5     2     1     1     1     0     8    1
tcpcb      736        8    0        5     1     0     1     1     0     8    0
arp        120        4    0        0     1     0     1     1     0     8    0
inpcb      312       36    0       30     1     0     1     1     0     8    0
nd6         48        3    0        0     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       10    0        2     1     0     1     1     0     8    0
pfstkey    112       10    0        2     1     0     1     1     0     8    0
pfstate    336       10    0        2     1     0     1     1     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      144    0        0     9     0     9     9     0     8    0
art_table   32      145    0        0     2     0     2     2     0     8    0
art_node    16       33    0        3     1     0     1     1     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino2pl    256     1452    0       49    88     0    88    88     0     8    0
ffsino     272     1452    0       49    94     0    94    94     0     8    0
nchpl      144     1694    0       59    61     0    61    61     0     8    0
uvmvnodes   80     1462    0        0    30     0    30    30     0     8    0
vnodes     224     1462    0        0    86     0    86    86     0     8    0
namei      1024    5194    0     5194     3     1     2     2     0     8    2
percpumem   16       33    0        0     1     0     1     1     0     8    0
kstatmem   264       10    0        0     1     0     1     1     0     8    0
scxspl     216     5405    0     5405    10     9     1     8     0     8    1
plimitpl   152       17    0        9     1     0     1     1     0     8    0
sigapl     424      350    0      316     5     0     5     5     0     8    0
knotepl    120       56    0        0     2     0     2     2     0     8    0
kqueuepl   216       21    0       13     1     0     1     1     0     8    0
pipepl     336      106    0       99     2     1     1     1     0     8    0
fdescpl    496      333    0      316     4     0     4     4     0     8    1
filepl     152     1386    0     1316     4     0     4     4     0     8    1
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       19    0        9     1     0     1     1     0     8    0
pgrppl      48       19    0        9     1     0     1     1     0     8    0
ucredpl     96       69    0       57     1     0     1     1     0     8    0
zombiepl   144      316    0      316     2     1     1     1     0     8    1
processpl  1064     350    0      316     3     0     3     3     0     8    0
procpl     672      358    0      316     5     0     5     5     0     8    1
sockpl     480       90    0       66     5     1     4     4     0     8    0
mcl8k      8192       5    0        0     1     0     1     1     0     8    0
mcl4k      4096       2    0        0     1     0     1     1     0     8    0
mcl2k      2048      82    0        0    11     1    10    11     0     8    0
mtagpl      96        2    0        0     1     0     1     1     0     8    0
mbufpl     256      148    0        0     9     0     9     9     0     8    0
bufpl      288     3543    0      145   243     0   243   243     0     8    0
anonpl      24    44948    0    41600    44     4    40    40     0   186   18
amapchunkpl 152    3528    0     3274    17     1    16    16     0   158    3
amappl16   200      203    0      142     5     0     5     5     0     8    0
amappl15   192        4    0        2     1     0     1     1     0     8    0
amappl14   184        1    0        1     1     0     1     1     0     8    1
amappl13   176       50    0       48     2     1     1     1     0     8    0
amappl12   168        6    0        4     2     1     1     1     0     8    0
amappl11   160       82    0       64     1     0     1     1     0     8    0
amappl10   152       23    0       19     1     0     1     1     0     8    0
amappl9    144      471    0      467     1     0     1     1     0     8    0
amappl8    136      414    0      397     1     0     1     1     0     8    0
amappl7    128       73    0       65     1     0     1     1     0     8    0
amappl6    120      160    0      144     2     0     2     2     0     8    0
amappl5    112       93    0       80     1     0     1     1     0     8    0
amappl4    104      692    0      667     2     0     2     2     0     8    1
amappl3     96      432    0      402     1     0     1     1     0     8    0
amappl2     88      571    0      525     3     0     3     3     0     8    1
amappl1     80    10433    0     9964    21     1    20    20     0     8    9
amappl      88     1424    0     1357     3     0     3     3     0    92    1
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      333    0      316     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      333    0      316     1     0     1     1     0     8    0
vmmpekpl   168     8126    0     8108     2     0     2     2     0     8    1
vmmpepl    168    32113    0    30958   100     8    92    92     0   357   40
vmsppl     368      332    0      316     3     0     3     3     0     8    1
rwobjpl     56    10997    0     8787    42     1    41    41     0     8    6
pdppl      4096     673    0      632    79    30    49    57     0     8    8
pvpl        32   210272    0   203867   258    12   246   246     0   265  190
pmappl     248      332    0      316     2     0     2     2     0     8    0
extentpl    40       58    0       38     1     0     1     1     0     8    0
phpool     112      555    0       36    15     0    15    15     0     8    0
ddb{1}> machine ddbcpu 0
Stopped at      x86_ipi_db+0x1a:        addq    $0x8,%rsp
x86_ipi_db(ffffffff829bcff0) at x86_ipi_db+0x1a 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+0x23
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x16 kd_curproc sys/dev/kcov.c:574 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x16 sys/dev/kcov.c:148
__mp_lock(ffffffff82a9d9e8) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82a9d9e8) at __mp_lock+0x133 sys/kern/kern_lock.c:147
intr_handler(ffff8000210ff300,ffff80000067c080) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206
sched_idle(ffffffff829bcff0) at sched_idle+0x417 sys/kern/kern_sched.c:178
end trace frame: 0x0, count: 6
ddb{0}> trace
x86_ipi_db(ffffffff829bcff0) at x86_ipi_db+0x1a 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+0x23
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x16 kd_curproc sys/dev/kcov.c:574 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x16 sys/dev/kcov.c:148
__mp_lock(ffffffff82a9d9e8) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82a9d9e8) at __mp_lock+0x133 sys/kern/kern_lock.c:147
intr_handler(ffff8000210ff300,ffff80000067c080) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206
sched_idle(ffffffff829bcff0) at sched_idle+0x417 sys/kern/kern_sched.c:178
end trace frame: 0x0, count: -9
ddb{0}> machine ddbcpu 1
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff82646cb3) at panic+0x177 sys/kern/subr_prf.c:202
m_copydata(fffffd80750fc500,30,1c,ffff8000212014b0) at m_copydata+0x140 sys/kern/uipc_mbuf.c:723
pf_walk_option(ffff800021201680,30,30,4c,ffff80002120190e) at pf_walk_option+0x64
pf_walk_header(ffff800021201680,ffff800021201630,ffff80002120190e) at pf_walk_header+0x180 sys/net/pf.c:6443
pf_test_state_icmp(ffff800021201800,ffff800021201900,ffff80002120190e) at pf_test_state_icmp+0x4a1 sys/net/pf.c:5231
pf_test(2,1,ffff800000bbc000,ffff800021201a28) at pf_test+0xc45 sys/net/pf.c:7127
ip_input_if(ffff800021201a28,ffff800021201a34,4,0,ffff800000bbc000) at ip_input_if+0x126 sys/netinet/ip_input.c:403
ipv4_input(ffff800000bbc000,fffffd80750fc500) at ipv4_input+0x48 sys/netinet/ip_input.c:277
ether_input(ffff800000bbc000,fffffd80750fc500) at ether_input+0x573
tun_dev_write(5d00,ffff800021201d98,11,2) at tun_dev_write+0x203 sys/net/if_tun.c:903
spec_write(ffff800021201bf0) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e5c3768,ffff800021201d98,11,fffffd807f7d7900) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
vn_write(fffffd806e5e9ac0,ffff800021201d98,0) at vn_write+0x157 sys/kern/vfs_vnops.c:414
end trace frame: 0xffff800021201d80, count: 0
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff82646cb3) at panic+0x177 sys/kern/subr_prf.c:202
m_copydata(fffffd80750fc500,30,1c,ffff8000212014b0) at m_copydata+0x140 sys/kern/uipc_mbuf.c:723
pf_walk_option(ffff800021201680,30,30,4c,ffff80002120190e) at pf_walk_option+0x64
pf_walk_header(ffff800021201680,ffff800021201630,ffff80002120190e) at pf_walk_header+0x180 sys/net/pf.c:6443
pf_test_state_icmp(ffff800021201800,ffff800021201900,ffff80002120190e) at pf_test_state_icmp+0x4a1 sys/net/pf.c:5231
pf_test(2,1,ffff800000bbc000,ffff800021201a28) at pf_test+0xc45 sys/net/pf.c:7127
ip_input_if(ffff800021201a28,ffff800021201a34,4,0,ffff800000bbc000) at ip_input_if+0x126 sys/netinet/ip_input.c:403
ipv4_input(ffff800000bbc000,fffffd80750fc500) at ipv4_input+0x48 sys/netinet/ip_input.c:277
ether_input(ffff800000bbc000,fffffd80750fc500) at ether_input+0x573
tun_dev_write(5d00,ffff800021201d98,11,2) at tun_dev_write+0x203 sys/net/if_tun.c:903
spec_write(ffff800021201bf0) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e5c3768,ffff800021201d98,11,fffffd807f7d7900) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
vn_write(fffffd806e5e9ac0,ffff800021201d98,0) at vn_write+0x157 sys/kern/vfs_vnops.c:414
dofilewritev(ffff8000fffeed20,c8,ffff800021201d98,0,ffff800021201e90) at dofilewritev+0x19c sys/kern/sys_generic.c:381
sys_write(ffff8000fffeed20,ffff800021201e30,ffff800021201e90) at sys_write+0x83 sys/kern/sys_generic.c:301
syscall(ffff800021201f00) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800021201f00) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe6b40, count: -18
ddb{1}> 

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-openbsd-multicore 2022/05/21 01:54 openbsd 20dbc0c1b0a8 bd37ad7e .config log report syz panic: m_copydata: null mbuf
ci-openbsd-multicore 2022/05/21 01:47 openbsd 20dbc0c1b0a8 bd37ad7e .config log report panic: m_copydata: null mbuf
* Struck through repros no longer work on HEAD.