syzbot


protection_fault: __x86_indirect_thunk_r11 (4)

Status: upstream: reported on 2025/04/29 08:10
Reported-by: syzbot+71e4456711474b9a7fdf@syzkaller.appspotmail.com
First crash: 54d, last: 1d19h
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd protection_fault: __x86_indirect_thunk_r11 (2) 15 391d 473d 0/3 auto-obsoleted due to no activity on 2024/08/17 10:13
openbsd protection_fault: __x86_indirect_thunk_r11 (3) 9 256d 308d 0/3 auto-obsoleted due to no activity on 2025/01/07 17:39
openbsd protection_fault: __x86_indirect_thunk_r11 1 601d 601d 0/3 auto-obsoleted due to no activity on 2024/01/28 10:43

Sample crash report:
kernel: protection fault trap, code=0
Stopped at      __x86_indirect_thunk_r11+0x14:  ret
ddb{1}> 
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
the kernel did not panic
ddb{1}> trace
__x86_indirect_thunk_r11() at __x86_indirect_thunk_r11+0x14
spec_write(ffff80002efec340) at spec_write+0x120 sys/kern/spec_vnops.c:302
VOP_WRITE(fffffd807c6c05f0,ffff80002efec560,1,fffffd80097fb340) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245
vn_write(fffffd806c0c42d0,ffff80002efec560,0) at vn_write+0x1d4 sys/kern/vfs_vnops.c:408
dofilewritev(ffff8000383f8550,3,ffff80002efec560,0,ffff80002efec620) at dofilewritev+0x23c sys/kern/sys_generic.c:380
sys_writev(ffff8000383f8550,ffff80002efec6d0,ffff80002efec620) at sys_writev+0xd8 sys/kern/sys_generic.c:327
syscall(ffff80002efec6d0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002efec6d0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xa860f2a8fe0, count: -8
ddb{1}> show registers
rdi               0xffff800001411000
rsi               0xfffffd8066e63400
rbp               0xffff80002efec290
rbx                                0
rdx               0xffff80002efec130
rcx                                0
rax                                0
r8                    0x7f7fffffc000
r9                               0x1
r10               0x7dbff3e3cfb88d3e
r11                  0x65bd900000000
r12                                0
r13               0xffff800001411000
r14               0xffff8000014dba00
r15               0xffff8000014dbac8
rip               0xffffffff82152304    __x86_indirect_thunk_r11+0x14
cs                               0x8
rflags                       0x10246    __ALIGN_SIZE+0xf246
rsp               0xffff80002efec120
ss                              0x10
__x86_indirect_thunk_r11+0x14:  ret
ddb{1}> show proc
PROC (syz-executor) tid=361259 pid=15222 tcnt=2 stat=onproc
    flags process=1000<SINGLEEXIT> proc=4080000<SUSPSINGLE,THREAD>
    runpri=0, usrpri=60, slppri=0, nice=20
    wchan=0x0, wmesg=, ps_single=0xffff8000ffff07d0 scnt=1 ecnt=0
    forw=0xffffffffffffffff, list=0xffff8000ffff07d0,0xffff8000383f99e0
    process=0xffff8000fffe9858 user=0xffff80002efe7000, vmspace=0xfffffd806c1e9b60
    estcpu=10, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{1}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 96017  353465  64858      0  2         0x2                sh
 11906  240532  82082      0  2           0                syz-executor
  3561  260716  26862      0  3         0x2  clonelk       ifconfig
 26862  168724  57486      0  3    0x10008a  sigsusp       sh
 83470  261111  28426      0  3         0x2  smrbar        ifconfig
 36240  155487  37097      0  3         0x2  clonelk       ifconfig
 37097    8129  43901      0  3    0x10008a  sigsusp       sh
 28426  206734  83748      0  3    0x10008a  sigsusp       sh
 98591  349450  69231      0  2         0x2                ifconfig
 57486  318430  82082      0  3        0x82  wait          syz-executor
 43901  295034  82082      0  3        0x82  wait          syz-executor
 83748  229615  82082      0  3        0x82  wait          syz-executor
 69231   88731  29017      0  3    0x10008a  sigsusp       sh
 29017  122752  82082      0  3        0x82  wait          syz-executor
 64858  131617  82082      0  7  0x10000002                syz-executor
 68442  241009  82082      0  3         0x2  clonelk       syz-executor
 44715  302526      1      0  3      0x3010  suspend       syz-executor
 44715  458778      1      0  2   0x4081010                syz-executor
  1541  375456      0      0  3     0x14200  acct          acct
 66316  234567      1      0  3      0x3000  suspend       syz-executor
 66316  253604      1      0  2   0x4081000                syz-executor
 15222   87254      1      0  3      0x3000  suspend       syz-executor
*15222  361259      1      0  7   0x4081000                syz-executor
 55431  344160      1      0  2      0x3000                syz-executor
 42642  167435      1      0  3    0x100083  ttyin         getty
 72089   95859      0      0  3     0x14200  bored         sosplice
 82082  371828  79805      0  2  0x10000002                syz-executor
 79805  450090  55416      0  3    0x10008a  sigsusp       ksh
 55416  174284   6350      0  3        0x98  kqread        sshd-session
  6350  211627  59556      0  3        0x92  kqread        sshd-session
 59556   60671      1      0  3        0x88  kqread        sshd
 10236  224948  76815     74  3   0x1100092  bpf           pflogd
 76815   11327      1      0  3        0x80  sbwait        pflogd
 12540  281187  80082     73  3   0x1100090  kqread        syslogd
 80082  437078      1      0  3    0x100082  sbwait        syslogd
 57364  158707      1      0  3    0x100080  kqread        resolvd
 89390  162593  10186     77  3    0x100092  kqread        dhcpleased
 32307  409709  10186     77  3    0x100092  kqread        dhcpleased
 10186  195392      1      0  3        0x80  kqread        dhcpleased
 30461  263169      0      0  3     0x14200  bored         smr
 82690  306751      0      0  2     0x14200                zerothread
 72036  137940      0      0  3     0x14200  aiodoned      aiodoned
  7029  287102      0      0  3     0x14200  syncer        update
 62116  519638      0      0  3     0x14200  cleaner       cleaner
  6177  375926      0      0  3     0x14200  reaper        reaper
 57454   72376      0      0  3     0x14200  pgdaemon      pagedaemon
 13515   89134      0      0  3     0x14200  bored         viomb
 92557  181968      0      0  3  0x40014200  acpi0         acpi0
 84820  101906      0      0  3  0x40014200                idle1
 15233  174553      0      0  3     0x14200  bored         softnet3
 33330   75436      0      0  3     0x14200  bored         softnet2
 34835  236502      0      0  2     0x14200                softnet1
 55712  522928      0      0  3     0x14200  bored         softnet0
 60199  111926      0      0  3     0x14200  bored         systqmp
 25270  218271      0      0  3     0x14200  bored         systq
  1701  491005      0      0  3     0x14200  tmoslp        softclockmp
  6320  347019      0      0  3  0x40014200  tmoslp        softclock
 13331   18504      0      0  3  0x40014200                idle0
     1  521971      0      0  3        0x82  wait          init
     0       0     -1      0  3  0x10010200  scheduler     swapper
ddb{1}> show all locks
Process 83470 (ifconfig) thread 0xffff8000ffff0f80 (261111)
exclusive rwlock clonelk r = 0 (0xffffffff837fdb08)
#0  witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1  rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310
#2  if_clone_destroy+0x67 sys/net/if.c:-1
#3  ifioctl+0x5c5 sys/net/if.c:-1
#4  sys_ioctl+0x5c3 sys/kern/sys_generic.c:-1
#5  syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5  syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
#6  Xsyscall+0x128
Process 15222 (syz-executor) thread 0xffff8000383f8550 (361259)
exclusive rwlock netlock r = 0 (0xffffffff837fdbf0)
#0  witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1  rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310
#2  bpfwrite+0x313 sys/net/bpf.c:681
#3  spec_write+0x120 sys/kern/spec_vnops.c:302
#4  VOP_WRITE+0x102 sys/kern/vfs_vops.c:245
#5  vn_write+0x1d4 sys/kern/vfs_vnops.c:408
#6  dofilewritev+0x23c sys/kern/sys_generic.c:380
#7  sys_writev+0xd8 sys/kern/sys_generic.c:327
#8  syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8  syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
#9  Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8392d428)
#0  witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1  __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1
#2  sleep_finish+0x2da sys/kern/kern_synch.c:366
#3  msleep_nsec+0x141 sys/kern/kern_synch.c:219
#4  pool_get+0x431 sys/kern/subr_pool.c:604
#5  m_clget+0x392 sys/kern/uipc_mbuf.c:-1
#6  bpf_movein+0x2d2 sys/net/bpf.c:227
#7  bpfwrite+0x1fa sys/net/bpf.c:664
#8  spec_write+0x120 sys/kern/spec_vnops.c:302
#9  VOP_WRITE+0x102 sys/kern/vfs_vops.c:245
#10 vn_write+0x1d4 sys/kern/vfs_vnops.c:408
#11 dofilewritev+0x23c sys/kern/sys_generic.c:380
#12 sys_writev+0xd8 sys/kern/sys_generic.c:327
#13 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#13 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
#14 Xsyscall+0x128
ddb{1}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 10250  11687K   12083K 166960K     13171        0
            pcb    17     13K      13K 166960K       132        0
         rtable   139     14K      16K 166960K       515        0
             pf    34     17K   67486K 166960K        92        0
         ifaddr    30      4K       7K 166960K        75        0
        ifgroup    56      2K       2K 166960K       119        0
         sysctl     4      1K       9K 166960K        15        0
       counters    66     36K      37K 166960K       114        0
       ioctlops     0      0K       4K 166960K      1568        0
            iov     0      0K      20K 166960K        84        0
          mount     1      1K       1K 166960K         1        0
            log     0      0K       0K 166960K         4        0
         vnodes  1528     96K      96K 166960K      2944        0
      UFS quota     1     32K      32K 166960K         1        0
      UFS mount     5     36K      36K 166960K         5        0
            shm     2      1K       9K 166960K        13        0
         VM map     2      1K       1K 166960K         2        0
            sem    12      0K       0K 166960K        35        0
        dirhash    12      2K       2K 166960K        15        0
           ACPI  1692    195K     286K 166960K     12470        0
      file desc    24     86K      94K 166960K      1031        0
          sigio     0      0K       0K 166960K        21        0
           proc   100    140K     152K 166960K       740        0
        subproc   108      6K       7K 166960K       324        0
    NFS srvsock     1      0K       0K 166960K         1        0
     NFS daemon     1     16K      16K 166960K         1        0
    ip_moptions     0      0K       0K 166960K       222        0
       in_multi    52      3K       7K 166960K       144        0
    ether_multi     1      0K       0K 166960K         1        0
            mrt     1      0K       0K 166960K         2        0
    ISOFS mount     1     32K      32K 166960K         1        0
  MSDOSFS mount     1     16K      16K 166960K         1        0
           ttys    79    360K     360K 166960K        79        0
           exec     0      0K       1K 166960K       632        0
   fusefs mount     1     32K      32K 166960K         1        0
     pfkey data     0      0K       0K 166960K         4        0
            tdb     3      0K       0K 166960K         3        0
        VM swap     8     62K      64K 166960K        10        0
       UVM amap   274    197K     214K 166960K     10550        0
       UVM aobj    82      4K       4K 166960K        86        0
     pinsyscall    49     98K     104K 166960K      2256        0
        memdesc     1      4K       4K 166960K         1        0
    crypto data     1      1K       1K 166960K         1        0
    ip6_options     1      0K       1K 166960K        67        0
            NDP    11      0K       2K 166960K        51        0
           temp    68   8691K    8757K 166960K     41029        0
         kqueue    16     22K      32K 166960K       145        0
      SYN cache     2     16K      16K 166960K         2        0
ddb{1}> show all pools
Name      Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache    128       26    0        0     1     0     1     1     0     8    0
rtpcb      120      204    0      201     3     2     1     3     0     8    0
rtentry    176      157    0      103     6     0     6     6     0     8    0
unpcb      144      474    0      452     6     5     1     6     0     8    0
syncache   336        6    0        6     4     4     0     1     0     8    0
tcpcb      736      404    0      398    10     9     1     7     0     8    0
arp        128       27    0       17     1     0     1     1     0     8    0
inpcb      328     1079    0     1065    14    12     2     7     0     8    0
nd6        144       34    0       22     1     0     1     1     0     8    0
pkpcb       40        7    0        7     1     1     0     1     0     8    0
kcovpl      48       36    0       24     1     0     1     1     0     8    0
mppekey    1024       1    0        1     1     1     0     1     0     8    0
ppxss      1192      12    0       12     2     2     0     1     0     8    0
pppxif     1504       1    0        1     1     1     0     1     0     8    0
pffrag     232        8    0        8     1     1     0     1     0   482    0
pffrnode    88        7    0        7     1     1     0     1     0     8    0
pffrent     40       11    0       11     1     1     0     1     0     8    0
pfosfp      40     1429    0     1005     5     0     5     5     0     8    0
pfosfpen   112     1429    0      714    21     0    21    21     0     8    0
pfstitem    24       51    0       49     1     0     1     1     0     8    0
pfstkey    128       53    0       51     2     0     2     2     0     8    1
pfstate    384       53    0       51     5     1     4     5     0     8    3
pfrule     1344      22    0       17     2     1     1     2     0     8    0
rttmr      136        1    0        1     1     1     0     1     0     8    0
art_heap8  4096       2    0        0     2     0     2     2     0     8    0
art_heap4  256      667    0      423    29     4    25    29     0     8    2
art_table   32      669    0      423     4     0     4     4     0     8    0
art_node    16      156    0      110     1     0     1     1     0     8    0
sysvmsgpl   40        7    0        5     1     0     1     1     0     8    0
semupl     112        1    0        1     1     1     0     1     0     8    0
semapl     112       28    0       18     1     0     1     1     0     8    0
shmpl      112       83    0        4     3     0     3     3     0     8    0
dirhash    1024      19    0        2     3     0     3     3     0     8    0
dino2pl    256     3108    0     1580    96     0    96    96     0     8    0
ffsino     288     3108    0     1580   111     1   110   110     0     8    0
nchpl      144     4326    0     2606    64     0    64    64     0     8    0
rtmask      32        1    0        1     1     1     0     1     0     8    0
uvmvnodes   80     4354    0        0    89     0    89    89     0     8    0
vnodes     216     4354    0        0   242     0   242   242     0     8    0
namei      1024   15471    0    15471     3     2     1     2     0     8    1
percpumem   16       72    0       24     1     0     1     1     0     8    0
kstatmem   264       64    0       36     3     0     3     3     0     8    0
scsiplug    72        4    0        4     3     3     0     1     0     8    0
scxspl     216    15719    0    15719    10     9     1     8     1     8    1
plimitpl   152      178    0      155     1     0     1     1     0     8    0
sigapl     424     1288    0     1229     8     1     7     7     0     8    0
knotepl    120      556    0        0    17     0    17    17     0     8    0
kqueuepl   224      409    0      399     9     8     1     5     0     8    0
pipepl     336      259    0      225     4     0     4     4     0     8    0
fdescpl    520     1267    0     1229     3     0     3     3     0     8    0
filepl     160     8420    0     8145    20     8    12    20     0     8    0
lockfpl    104      268    0      266     1     0     1     1     0     8    0
lockfspl    48      103    0      101     1     0     1     1     0     8    0
sessionpl  144       47    0       38     1     0     1     1     0     8    0
pgrppl      48       98    0       76     1     0     1     1     0     8    0
ucredpl    104     1365    0     1351     1     0     1     1     0     8    0
zombiepl   144     1236    0     1229     1     0     1     1     0     8    0
processpl  1240    1288    0     1229     5     0     5     5     0     8    0
procpl     656     2587    0     2525     7     1     6     7     0     8    0
srpgc       96       14    0       12     3     2     1     1     0     8    0
sosppl     168        3    0        3     2     2     0     1     0     8    0
sockpl     728     1782    0     1743    27    23     4    20     0     8    0
mcl64k     65536      4    0        0     1     0     1     1     0     8    0
mcl16k     16384      1    0        0     1     0     1     1     0     8    0
mcl9k      9216       3    0        0     1     0     1     1     0     8    0
mcl8k      8192       8    0        0     1     0     1     1     0     8    0
mcl4k      4096     133    0        0    17     0    17    17     0     8    0
mcl2k2     2112       1    0        0     1     0     1     1     0     8    0
mcl2k      2048      41  559       20     4     0     4     4     0     8    1
mtagpl      96      154    0        0     4     0     4     4     0     8    0
mbufpl     256     2572    0        0   161     0   161   161     0     8    0
bufpl      280     7159    0     1017   439     0   439   439     0     8    0
anonpl      32    10733    0        0    87     0    87    87     0   246    0
amapchunkpl 152   33320    0    32723    38     8    30    32     0   158    5
amappl16   200     3895    0     3865    44    31    13    22     0     8    8
amappl15   192        5    0        5     1     1     0     1     0     8    0
amappl14   184      123    0      111     1     0     1     1     0     8    0
amappl13   176        6    0        6     1     1     0     1     0     8    0
amappl12   168     2006    0     1969     3     1     2     2     0     8    0
amappl11   160       51    0       36     1     0     1     1     0     8    0
amappl10   152       27    0       27     1     1     0     1     0     8    0
amappl9    144      266    0      266     1     1     0     1     0     8    0
amappl8    136       22    0       19     1     0     1     1     0     8    0
amappl7    128      165    0      153     1     0     1     1     0     8    0
amappl6    120      228    0      215     1     0     1     1     0     8    0
amappl5    112      153    0      139     1     0     1     1     0     8    0
amappl4    104      340    0      320     1     0     1     1     0     8    0
amappl3     96     6748    0     6629     4     0     4     4     0     8    0
amappl2     88      719    0      644     2     0     2     2     0     8    0
amappl1     80    12261    0    11632    15     1    14    14     0     8    0
amappl      88     9637    0     9443     5     0     5     5     0    92    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        7    0        7     2     2     0     1     0     8    0
dma128     128      256    0      256     4     4     0     1     0     8    0
dma64       64        7    0        7     2     2     0     1     0     8    0
dma32       32        8    0        8     2     2     0     1     0     8    0
dma16       16       18    0       17     1     0     1     1     0     8    0
aobjpl      72       85    0        4     2     0     2     2     0     8    0
uaddrrnd    24     1267    0     1229     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24     1267    0     1229     1     0     1     1     0     8    0
vmmpekpl   168    11313    0    11239     4     0     4     4     0     8    0
vmmpepl    168    85596    0    83473   114    13   101   105     0   357    4
vmsppl     480     1266    0     1229     5     0     5     5     0     8    0
rwobjpl     72    28275    0    22736   102     1   101   101     0     8    0
pdppl      4096    2541    0     2458   125    38    87    87     0     8    4
pvpl        32    18393    0        0   150     1   149   149     0   265    0
pmappl     256     1266    0     1229     3     0     3     3     0     8    0
extentpl    40       45    0       27     1     0     1     1     0     8    0
phpool     112      580    0       62    15     0    15    15     0     8    0
ddb{1}> machine ddbcpu 0
Stopped at      x86_ipi_db+0x27:        addq    $0x8,%rsp
ddb{0}> trace
x86_ipi_db(ffffffff8381dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff8392d220) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline]
__mp_lock(ffffffff8392d220) at __mp_lock+0x192 sys/kern/kern_lock.c:165
softintr_dispatch(0) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83
dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847
Xsoftclock() at Xsoftclock+0x27
__mp_lock(ffffffff8392d220) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline]
__mp_lock(ffffffff8392d220) at __mp_lock+0x192 sys/kern/kern_lock.c:165
syscall(ffff80002a2fab30) at syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a2fab30) at syscall+0xae6 sys/arch/amd64/amd64/trap.c:579
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7ad53c7771c0, count: -10
ddb{0}> machine ddbcpu 1

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/21 11:50 openbsd f62159b6a996 d6cdfb8a .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore protection_fault: __x86_indirect_thunk_r11
2025/06/10 21:52 openbsd a3912f8462f6 5d7e17ca .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main protection_fault: __x86_indirect_thunk_r11
2025/05/09 04:29 openbsd 278cc48cac9b bb813bcc .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore protection_fault: __x86_indirect_thunk_r11
2025/04/29 08:09 openbsd 3f9d9c6488b4 aeb6ec69 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore protection_fault: __x86_indirect_thunk_r11
* Struck through repros no longer work on HEAD.