syzbot


protection_fault: lf_advlock (4)

Status: upstream: reported C repro on 2024/03/19 07:17
Reported-by: syzbot+7ce68750203264d6bfbf@syzkaller.appspotmail.com
First crash: 98d, last: 45d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd protection_fault: lf_advlock (3) 6 279d 518d 0/3 auto-obsoleted due to no activity on 2023/12/19 11:04
openbsd protection_fault: lf_advlock (2) 4 735d 784d 0/3 auto-obsoleted due to no activity on 2022/09/18 14:20
openbsd protection_fault: lf_advlock C 2 835d 880d 3/3 fixed on 2022/04/28 05:27
Last patch testing requests (3)
Created Duration User Patch Repo Result
2024/06/11 08:04 0m retest repro openbsd error OK
2024/05/25 08:12 15m retest repro openbsd OK log
2024/04/02 07:18 39m retest repro openbsd report log

Sample crash report:
kernel: protection fault trap, code=0
Stopped at      lf_advlock+0x225:       incl    0x28(%r12)
ddb{1}> 
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
the kernel did not panic
ddb{1}> trace
lf_advlock(ffff800000dd18e0,0,fffffd806d5c6ba8,2,ffff80002a222b00,40) at lf_advlock+0x225 ls_ref sys/kern/vfs_lockf.c:138 [inline]
lf_advlock(ffff800000dd18e0,0,fffffd806d5c6ba8,2,ffff80002a222b00,40) at lf_advlock+0x225 sys/kern/vfs_lockf.c:278
VOP_ADVLOCK(fffffd806c6150f0,fffffd806d5c6ba8,2,ffff80002a222b00,40) at VOP_ADVLOCK+0x75 sys/kern/vfs_vops.c:612
closef(fffffd806e545b58,ffff80002a187d60) at closef+0xe9
fdfree(ffff80002a187d60) at fdfree+0xe4 sys/kern/kern_descrip.c:1190
exit1(ffff80002a187d60,0,0,1) at exit1+0x3a0 sys/kern/kern_exit.c:199
sys_exit(ffff80002a187d60,ffff80002a222d50,ffff80002a222cb0) at sys_exit+0x1a sys/kern/kern_exit.c:89
syscall(ffff80002a222d50) at syscall+0x53b mi_syscall sys/sys/syscall_mi.h:183 [inline]
syscall(ffff80002a222d50) at syscall+0x53b sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7c949edf1660, count: -8
ddb{1}> show registers
rdi                                0
rsi                                0
rbp               0xffff80002a222a50
rbx                                0
rdx                              0xa
rcx                              0x9
rax                                0
r8                              0x30
r9                               0x1
r10               0x80932b5a4f1b51fc
r11               0xa55bfdc2f55aa6de
r12               0xdeafbeaddeafbead
r13                              0x2
r14               0xffff800000dd18e0
r15               0xffffffffffffffff
rip               0xffffffff813008d5    lf_advlock+0x225
cs                               0x8
rflags                       0x10246    __ALIGN_SIZE+0xf246
rsp               0xffff80002a2229c0
ss                              0x10
lf_advlock+0x225:       incl    0x28(%r12)
ddb{1}> show proc
PROC (syz-executor126314685) tid=373523 pid=52072 tcnt=1 stat=onproc
    flags process=8000008<EXITING> proc=2000<WEXIT>
    runpri=32, usrpri=50, slppri=32, nice=20
    wchan=0x0, wmesg=, ps_single=0x0
    forw=0xffffffffffffffff, list=0xffff80002a1882b0,0xffff80002a187820
    process=0xffff8000ffff0d68 user=0xffff80002a21d000, vmspace=0xfffffd807ab2f010
    estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{1}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 31792  385046  82052      0  3   0x8000000  lockflk       syz-executor126314685
 97857  116886  64941      0  3   0x8000000  lockflk       syz-executor126314685
 82052   88224    896      0  3   0x8000080  nanoslp       syz-executor126314685
 64941  374291    896      0  3   0x8000080  nanoslp       syz-executor126314685
 73631  214431    896      0  3   0x8000080  nanoslp       syz-executor126314685
 72219  183891    896      0  3   0x8000080  nanoslp       syz-executor126314685
 37545  466633    896      0  3   0x8000080  nanoslp       syz-executor126314685
 72749   58424    896      0  3   0x8000080  nanoslp       syz-executor126314685
 30764   21294    896      0  3   0x8000080  nanoslp       syz-executor126314685
 53784  307874    896      0  3   0x8000080  nanoslp       syz-executor126314685
   896  199422  64019      0  3   0x8000082  nanoslp       syz-executor126314685
 64019  104575  89224      0  3   0x810008a  sigsusp       ksh
 89224   83564  79960      0  3  0x1800009a  kqread        sshd
 41914  147726      1      0  3  0x18100083  ttyin         getty
 79960  146431      1      0  3  0x18000088  kqread        sshd
 72707   46929  87453     73  3  0x19100090  kqread        syslogd
 87453  182163      1      0  3  0x18100082  netio         syslogd
 86409  204017      1      0  3  0x18100080  kqread        resolvd
 40093  488990  13943     77  3  0x18100092  kqread        dhcpleased
 51793  131945  13943     77  3  0x18100092  kqread        dhcpleased
 13943  384003      1      0  3  0x18000080  kqread        dhcpleased
 47818  165877      0      0  3     0x14200  bored         smr
 96377  466269      0      0  3     0x14200  pgzero        zerothread
 68963  242179      0      0  3     0x14200  aiodoned      aiodoned
 74118  520660      0      0  3     0x14200  syncer        update
 30836  130211      0      0  3     0x14200  cleaner       cleaner
 84479   57517      0      0  3     0x14200  reaper        reaper
  6433  206270      0      0  3     0x14200  pgdaemon      pagedaemon
 16762  506985      0      0  3     0x14200  bored         viomb
 11212   16708      0      0  3  0x40014200  acpi0         acpi0
 51907  244303      0      0  3  0x40014200                idle1
 11981  496207      0      0  3     0x14200  bored         softnet3
 94379  241037      0      0  3     0x14200  bored         softnet2
 32446  209658      0      0  3     0x14200  bored         softnet1
 83410  387093      0      0  3     0x14200  bored         softnet0
 27381  427184      0      0  3     0x14200  bored         systqmp
 28262  223740      0      0  3     0x14200  bored         systq
 47499   42076      0      0  3     0x14200  tmoslp        softclockmp
 11281  232076      0      0  3  0x40014200  tmoslp        softclock
 93839  187848      0      0  7  0x40014200                idle0
     1  446785      0      0  3   0x8000082  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb{1}> show all locks
ddb{1}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 10165   6390K    6419K 166960K     11243        0
            pcb    15     10K      10K 166960K        15        0
         rtable    58      1K       2K 166960K       112        0
             pf    12      6K       6K 166960K        12        0
         ifaddr    12      9K       9K 166960K        12        0
        ifgroup    17      1K       1K 166960K        17        0
       counters    48     34K      34K 166960K        48        0
       ioctlops     0      0K       2K 166960K        21        0
          mount     1      1K       1K 166960K         1        0
            log     0      0K       0K 166960K         4        0
         vnodes  1259     79K      79K 166960K     88250        0
      UFS quota     1     32K      32K 166960K         1        0
      UFS mount     5     36K      36K 166960K         5        0
            shm     2      1K       1K 166960K         2        0
         VM map     2      1K       1K 166960K         2        0
            sem     2      0K       0K 166960K         2        0
        dirhash    12      2K       2K 166960K        12        0
           ACPI  1697    195K     286K 166960K     12548        0
      file desc     4      6K      17K 166960K    222460        0
           proc    55     78K      79K 166960K       246        0
    NFS srvsock     1      0K       0K 166960K         1        0
     NFS daemon     1     16K      16K 166960K         1        0
       in_multi    11      0K       0K 166960K        11        0
    ether_multi     1      0K       0K 166960K         1        0
    ISOFS mount     1     32K      32K 166960K         1        0
  MSDOSFS mount     1     16K      16K 166960K         1        0
           ttys   121    546K     546K 166960K       121        0
           exec     0      0K       1K 166960K       246        0
            tdb     3      0K       0K 166960K         3        0
        VM swap     8     62K      64K 166960K        10        0
       UVM amap   105      5K       6K 166960K     76580        0
       UVM aobj     3      2K       2K 166960K         3        0
     pinsyscall    32     64K      74K 166960K     75010        0
        memdesc     1      4K       4K 166960K         1        0
    crypto data     1      1K       1K 166960K         1        0
            NDP     3      0K       0K 166960K         3        0
           temp     1   6796K    6860K 166960K      2858        0
         kqueue    11     16K      18K 166960K        24        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       24    0        0     1     0     1     1     0     8    0
rtpcb      120       21    0       18     1     0     1     1     0     8    0
rtentry    112       23    0        1     1     0     1     1     0     8    0
unpcb      144       33    0       20     1     0     1     1     0     8    0
syncache   336        5    0        5     2     2     0     1     0     8    0
tcpqe       32       92    0       92     1     1     0     1     0     8    0
tcpcb      808        8    0        5     1     0     1     1     0     8    0
arp        120        2    0        0     1     0     1     1     0     8    0
inpcb      392       26    0       20     1     0     1     1     0     8    0
art_heap8  4096       1    0        0     1     0     1     1     0     8    0
art_heap4  256       97    0        0     7     0     7     7     0     8    0
art_table   32       98    0        0     1     0     1     1     0     8    0
art_node    16       22    0        2     1     0     1     1     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino2pl    256    88477    0    87015    92     0    92    92     0     8    0
ffsino     272    88477    0    87015    98     0    98    98     0     8    0
nchpl      144    88661    0    87022    61     0    61    61     0     8    0
uvmvnodes   80     5926    0        0   121     0   121   121     0     8    0
vnodes     216     5926    0        0   330     0   330   330     0     8    0
namei      1024 1190792    0  1190792     2     1     1     1     0     8    1
percpumem   16       38    0        0     1     0     1     1     0     8    0
kstatmem   264        6    0        0     1     0     1     1     0     8    0
scxspl     216     5544    0     5544     9     8     1     8     1     8    1
plimitpl   152       16    0       10     1     0     1     1     0     8    0
sigapl     424    74474    0    74427     6     0     6     6     0     8    0
knotepl    120       47    0        0     2     0     2     2     0     8    0
kqueuepl   216       20    0       13     1     0     1     1     0     8    0
pipepl     320       88    0       85     2     1     1     1     0     8    0
fdescpl    496    74456    0    74432     5     1     4     4     0     8    0
filepl     152   890963    0   890899     8     4     4     4     0     8    1
lockfpl    104   296615    0   296612     1     0     1     1     0     8    0
lockfspl    48    74157    0    74154     1     0     1     1     0     8    0
sessionpl  144       17    0        9     1     0     1     1     0     8    0
pgrppl      48       17    0        9     1     0     1     1     0     8    0
ucredpl    104   889893    0   889883     1     0     1     1     0     8    0
zombiepl   144    74433    0    74427     2     1     1     1     0     8    0
processpl  1136   74474    0    74427     4     0     4     4     0     8    0
procpl     680    74474    0    74427     4     0     4     4     0     8    0
sockpl     584       80    0       58     2     0     2     2     0     8    0
mcl8k      8192       2    0        0     1     0     1     1     0     8    0
mcl4k      4096       6    0        0     1     0     1     1     0     8    0
mcl2k      2048     299    0        0    33     9    24    33     0     8    0
mtagpl      96        3    0        0     1     0     1     1     0     8    0
mbufpl     256      324    0        0    18     1    17    18     0     8    0
bufpl      280     2481    0       84   172     0   172   172     0     8    0
anonpl      24   631968    0   630129    26    14    12    23     0   186    0
amapchunkpl 152   82641    0    82499     7     1     6     7     0   158    0
amappl16   200    79662    0    79659     6     5     1     5     0     8    0
amappl15   192       11    0       11     1     1     0     1     0     8    0
amappl14   184      162    0      153     1     0     1     1     0     8    0
amappl13   176       13    0       13     1     1     0     1     0     8    0
amappl12   168      826    0      814     1     0     1     1     0     8    0
amappl11   160       58    0       48     1     0     1     1     0     8    0
amappl10   152       17    0       17     2     2     0     1     0     8    0
amappl9    144      208    0      208     1     1     0     1     0     8    0
amappl8    136       33    0       32     2     1     1     1     0     8    0
amappl7    128       45    0       44     1     0     1     1     0     8    0
amappl6    120      174    0      163     1     0     1     1     0     8    0
amappl5    112      125    0      113     1     0     1     1     0     8    0
amappl4    104    74560    0    74524     2     0     2     2     0     8    1
amappl3     96     2166    0     2140     1     0     1     1     0     8    0
amappl2     88    74751    0    74697     2     0     2     2     0     8    0
amappl1     80   231350    0   230922    15     4    11    11     0     8    0
amappl      88    76274    0    76215     2     0     2     2     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        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    74457    0    74433     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24    74457    0    74433     1     0     1     1     0     8    0
vmmpekpl   168   208064    0   208047     1     0     1     1     0     8    0
vmmpepl    168  1221380    0  1220314    66    16    50    50     0   357    2
vmsppl     448    74456    0    74433     9     5     4     4     0     8    1
rwobjpl     56    97719    0    91187    94     1    93    93     0     8    0
pdppl      4096  148921    0   148866   121    62    59    65     0     8    4
pvpl        32     6275    0        0    51     0    51    51     0   265    0
pmappl     248    74456    0    74433     3     1     2     2     0     8    0
extentpl    40       56    0       38     1     0     1     1     0     8    0
phpool     112      398    0       82    10     0    10    10     0     8    0
ddb{1}> machine ddbcpu 0
Stopped at      x86_ipi_db+0x1e:        addq    $0x8,%rsp
ddb{0}> trace
x86_ipi_db(ffffffff82d54ff0) at x86_ipi_db+0x1e 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+0x27
acpicpu_idle() at acpicpu_idle+0x2f1 sys/dev/acpi/acpicpu.c:1206
sched_idle(ffffffff82d54ff0) at sched_idle+0x41d sys/kern/kern_sched.c:183
end trace frame: 0x0, count: -5
ddb{0}> machine ddbcpu 1
Stopped at      lf_advlock+0x225:       incl    0x28(%r12)
ddb{1}> trace
lf_advlock(ffff800000dd18e0,0,fffffd806d5c6ba8,2,ffff80002a222b00,40) at lf_advlock+0x225 ls_ref sys/kern/vfs_lockf.c:138 [inline]
lf_advlock(ffff800000dd18e0,0,fffffd806d5c6ba8,2,ffff80002a222b00,40) at lf_advlock+0x225 sys/kern/vfs_lockf.c:278
VOP_ADVLOCK(fffffd806c6150f0,fffffd806d5c6ba8,2,ffff80002a222b00,40) at VOP_ADVLOCK+0x75 sys/kern/vfs_vops.c:612
closef(fffffd806e545b58,ffff80002a187d60) at closef+0xe9
fdfree(ffff80002a187d60) at fdfree+0xe4 sys/kern/kern_descrip.c:1190
exit1(ffff80002a187d60,0,0,1) at exit1+0x3a0 sys/kern/kern_exit.c:199
sys_exit(ffff80002a187d60,ffff80002a222d50,ffff80002a222cb0) at sys_exit+0x1a sys/kern/kern_exit.c:89
syscall(ffff80002a222d50) at syscall+0x53b mi_syscall sys/sys/syscall_mi.h:183 [inline]
syscall(ffff80002a222d50) at syscall+0x53b sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7c949edf1660, count: -8

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/19 07:17 openbsd a69db6767cfd 6ee49f2e .config console log report syz C [disk image] [bsd.gdb] [kernel image] ci-openbsd-setuid protection_fault: lf_advlock
2024/05/11 08:09 openbsd f63e15d85063 9026e142 .config console log report syz [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore protection_fault: lf_advlock
* Struck through repros no longer work on HEAD.