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: 575d, last: 8d23h
Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd protection_fault: lf_advlock (3) -1 6 756d 995d 0/3 auto-obsoleted due to no activity on 2023/12/19 11:04
openbsd protection_fault: lf_advlock (2) -1 4 1213d 1261d 0/3 auto-obsoleted due to no activity on 2022/09/18 14:20
openbsd protection_fault: lf_advlock -1 C 2 1313d 1357d 3/3 fixed on 2022/04/28 05:27
Last patch testing requests (9)
Created Duration User Patch Repo Result
2025/10/02 07:10 18m retest repro openbsd OK log
2025/07/07 20:17 19m retest repro openbsd report log
2025/04/25 03:46 15m retest repro openbsd report log
2025/01/27 19:30 18m retest repro openbsd report log
2024/11/07 17:38 15m retest repro openbsd report log
2024/08/20 08:06 15m retest repro openbsd report log
2024/06/11 08:04 0m retest repro openbsd error
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+0x228:       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(ffff800000dd7960,0,fffffd8008be77c8,2,ffff80002a384f70,40) at lf_advlock+0x228 ls_ref sys/kern/vfs_lockf.c:138 [inline]
lf_advlock(ffff800000dd7960,0,fffffd8008be77c8,2,ffff80002a384f70,40) at lf_advlock+0x228 sys/kern/vfs_lockf.c:278
VOP_ADVLOCK(fffffd8067600048,fffffd8008be77c8,2,ffff80002a384f70,40) at VOP_ADVLOCK+0x75 sys/kern/vfs_vops.c:612
closef(fffffd8067c4b3a8,ffff80002a1fc7d0) at closef+0xe9
fdfree(ffff80002a1fc7d0) at fdfree+0xe4 sys/kern/kern_descrip.c:1190
exit1(ffff80002a1fc7d0,0,0,1) at exit1+0x38a sys/kern/kern_exit.c:199
sys_exit(ffff80002a1fc7d0,ffff80002a3851c0,ffff80002a385110) at sys_exit+0x1a sys/kern/kern_exit.c:89
syscall(ffff80002a3851c0) at syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline]
syscall(ffff80002a3851c0) at syscall+0x854 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7e0eea5386d0, count: -8
ddb{1}> show registers
rdi                                0
rsi                                0
rbp               0xffff80002a384ec0
rbx                                0
rdx                              0xa
rcx                              0x9
rax                                0
r8                                 0
r9                               0x1
r10               0xeefed8493f2fe2fa
r11               0xd919fbb671be48ac
r12               0xdeaf4152deaf4152
r13                              0x2
r14               0xffff800000dd7960
r15               0xffffffffffffffff
rip               0xffffffff82036388    lf_advlock+0x228
cs                               0x8
rflags                       0x10246    __ALIGN_SIZE+0xf246
rsp               0xffff80002a384e30
ss                              0x10
lf_advlock+0x228:       incl    0x28(%r12)
ddb{1}> show proc
PROC (syz-executor.6) tid=390366 pid=82862 tcnt=1 stat=onproc
    flags process=8001008<EXITING,SINGLEEXIT> proc=2000<WEXIT>
    runpri=32, usrpri=83, slppri=32, nice=20
    wchan=0x0, wmesg=, ps_single=0xffff80002a1fc7d0
    forw=0xffffffffffffffff, list=0xffff80002a2e4028,0xffff80002a2e42c8
    process=0xffff80002a296c78 user=0xffff80002a380000, vmspace=0xfffffd8067750540
    estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{1}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 26260   60885  27324      0  3   0x8000082  nanoslp       syz-executor.7
 16436  440126  27324      0  3   0x8000082  nanoslp       syz-executor.3
 36886   14454  27324      0  3   0x8000082  nanoslp       syz-executor.2
 48777  436215  27324      0  3   0x8000002  biowait       syz-executor.5
 13081  110897  27324      0  3   0x8000082  nanoslp       syz-executor.4
 58180   40732  27324      0  7   0x8000002                syz-executor.1
 12932  265988  27324      0  3   0x8000082  nanoslp       syz-executor.6
 52183   88759  27324      0  2   0x8000482                syz-executor.0
 27324  330302  74480      0  3  0x1a000082  wait          syz-execprog
 27324  195484  74480      0  3  0x1e000082  nanoslp       syz-execprog
 27324  204213  74480      0  3  0x1e000082  thrsleep      syz-execprog
 27324   90460  74480      0  3  0x1e000082  thrsleep      syz-execprog
 27324  515398  74480      0  3  0x1e000082  thrsleep      syz-execprog
 27324  202178  74480      0  3  0x1e000082  wait          syz-execprog
 27324  285055  74480      0  3  0x1e000082  wait          syz-execprog
 27324   57261  74480      0  3  0x1e000082  wait          syz-execprog
 27324  280045  74480      0  3  0x1e000082  wait          syz-execprog
 27324  293142  74480      0  3  0x1e000082  wait          syz-execprog
 27324  151216  74480      0  3  0x1e000082  thrsleep      syz-execprog
 27324  213960  74480      0  3  0x1e000082  wait          syz-execprog
 27324  366851  74480      0  3  0x1e000082  wait          syz-execprog
 27324  400006  74480      0  3  0x1e000082  thrsleep      syz-execprog
 27324  269634  74480      0  3  0x1e000082  thrsleep      syz-execprog
 27324  419717  74480      0  3  0x1e000082  kqread        syz-execprog
 74480   18435  83228      0  3   0x810008a  sigsusp       ksh
 83228  406922  90688      0  3  0x1800009a  kqread        sshd
 97561   50012      1      0  3  0x18100083  ttyin         getty
 90688  283361      1      0  3  0x18000088  kqread        sshd
 10540  520940  97256     73  3  0x19100090  kqread        syslogd
 97256  472878      1      0  3  0x18100082  sbwait        syslogd
 18174  472501      1      0  3  0x18100080  kqread        resolvd
 38665   85135  19259     77  3  0x18100092  kqread        dhcpleased
 79133  107953  19259     77  3  0x18100092  kqread        dhcpleased
 19259  459393      1      0  3  0x18000080  kqread        dhcpleased
 64562  396651      0      0  3     0x14200  bored         smr
 31902  306370      0      0  2     0x14200                zerothread
 99104  253998      0      0  3     0x14200  aiodoned      aiodoned
 16640   42772      0      0  3     0x14200  syncer        update
 20205  282670      0      0  3     0x14200  cleaner       cleaner
 28324  502266      0      0  3     0x14200  reaper        reaper
 56506  302340      0      0  3     0x14200  pgdaemon      pagedaemon
 90743  442368      0      0  3     0x14200  bored         viomb
 41629  255791      0      0  3  0x40014200  acpi0         acpi0
 51448  298965      0      0  3  0x40014200                idle1
 56170  129564      0      0  3     0x14200  bored         softnet3
 88640  415550      0      0  3     0x14200  bored         softnet2
 53710  407433      0      0  3     0x14200  bored         softnet1
 46185  137502      0      0  3     0x14200  bored         softnet0
 53076  206285      0      0  3     0x14200  bored         systqmp
 89504  128835      0      0  3     0x14200  bored         systq
 99350  220600      0      0  3     0x14200  tmoslp        softclockmp
 19457  491810      0      0  3  0x40014200  tmoslp        softclock
  9130   96516      0      0  3  0x40014200                idle0
     1  416372      0      0  3   0x8000082  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb{1}> show all locks
Process 48777 (syz-executor.5) thread 0xffff80002a1fc020 (436215)
exclusive rrwlock inode r = 0 (0xfffffd8068aa21b8)
#0  witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x446 sys/kern/subr_witness.c:1157
#1  rw_enter+0x32d sys/kern/kern_rwlock.c:309
#2  rrw_enter+0x91 sys/kern/kern_rwlock.c:464
#3  VOP_LOCK+0x8b sys/kern/vfs_vops.c:518
#4  vn_lock+0x85 sys/kern/vfs_vnops.c:564
#5  vget+0x1fd sys/kern/vfs_subr.c:676
#6  ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119
#7  ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1201
#8  ufs_lookup+0x1373 sys/ufs/ufs/ufs_lookup.c:478
#9  VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85
#10 vfs_lookup+0x6f8 sys/kern/vfs_lookup.c:566
#11 namei+0x56a sys/kern/vfs_lookup.c:250
#12 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1855
#13 syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline]
#13 syscall+0x854 sys/arch/amd64/amd64/trap.c:577
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd8066e644e0)
#0  witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x446 sys/kern/subr_witness.c:1157
#1  rw_enter+0x32d sys/kern/kern_rwlock.c:309
#2  rrw_enter+0x91 sys/kern/kern_rwlock.c:464
#3  VOP_LOCK+0x8b sys/kern/vfs_vops.c:518
#4  vn_lock+0x85 sys/kern/vfs_vnops.c:564
#5  vfs_lookup+0xd3 sys/kern/vfs_lookup.c:418
#6  namei+0x56a sys/kern/vfs_lookup.c:250
#7  dounlinkat+0x9d sys/kern/vfs_syscalls.c:1855
#8  syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline]
#8  syscall+0x854 sys/arch/amd64/amd64/trap.c:577
#9  Xsyscall+0x128
ddb{1}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 10194   6414K    6420K 166960K     79858        0
            pcb    17     12K      12K 166960K        17        0
         rtable   234      6K       6K 166960K       347        0
             pf    29      8K      10K 166960K        40        0
         ifaddr    44     15K      15K 166960K        46        0
        ifgroup    50      2K       2K 166960K        50        0
       counters    64     36K      36K 166960K        64        0
       ioctlops     0      0K       4K 166960K      1481        0
          mount     1      1K       1K 166960K         1        0
            log     0      0K       0K 166960K         4        0
         vnodes  1268     80K      80K 166960K     69878        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    13     45K      93K 166960K     68727        0
           proc    55     78K     103K 166960K       480        0
    NFS srvsock     1      0K       0K 166960K         1        0
     NFS daemon     1     16K      16K 166960K         1        0
       in_multi    99      7K       7K 166960K        99        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   127    572K     572K 166960K       127        0
           exec     0      0K       1K 166960K       370        0
            tdb     3      0K       0K 166960K         3        0
        VM swap     8     62K      64K 166960K        10        0
       UVM amap   274     77K      79K 166960K    565458        0
       UVM aobj     3      2K       2K 166960K         3        0
     pinsyscall    33     66K     100K 166960K     69868        0
        memdesc     1      4K       4K 166960K         1        0
    crypto data     1      1K       1K 166960K         1        0
            NDP    11      0K       2K 166960K        27        0
           temp     1   6804K    6868K 166960K    209787        0
         kqueue    12     18K      18K 166960K        25        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    68628    0    68623     1     0     1     1     0     8    0
rtentry    112      111    0        1     4     0     4     4     0     8    0
unpcb      144   137223    0   137210    19    18     1     2     0     8    0
syncache   336        5    0        5     2     2     0     1     0     8    0
tcpqe       32       18    0       18     1     1     0     1     0     8    0
tcpcb      808        8    0        5     1     0     1     1     0     8    0
arp        120       18    0        0     1     0     1     1     0     8    0
inpcb      384       62    0       56     1     0     1     1     0     8    0
nd6        136       24    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       27    0       26     2     1     1     1     0     8    0
pfstkey    128       27    0       26     2     1     1     1     0     8    0
pfstate    376       27    0       26     3     2     1     2     0     8    0
pfrule     1344      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      453    0        0    29     0    29    29     0     8    0
art_table   32      454    0        0     4     0     4     4     0     8    0
art_node    16      110    0       10     1     0     1     1     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino2pl    256    70166    0    68645    96     0    96    96     0     8    0
ffsino     272    70166    0    68645   102     0   102   102     0     8    0
nchpl      144   139020    0   137249    67     1    66    66     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 1309571    0  1309571     3     2     1     2     0     8    1
percpumem   16       46    0        0     1     0     1     1     0     8    0
kstatmem   264       22    0        0     2     0     2     2     0     8    0
scxspl     216   419037    0   419036    11    10     1     8     1     8    0
plimitpl   152    68629    0    68607     1     0     1     1     0     8    0
sigapl     424    69032    0    68986     7     1     6     7     0     8    0
futexpl     64  1049617    0  1049617     1     0     1     1     0     8    1
knotepl    120      118    0        0     4     0     4     4     0     8    0
kqueuepl   216    68616    0    68608     1     0     1     1     0     8    0
pipepl     320      142    0      114     4     1     3     3     0     8    0
fdescpl    496    69014    0    68990     6     2     4     5     0     8    0
filepl     152  1099175    0  1099028    20    13     7     8     0     8    0
lockfpl    104   274290    0   274282     1     0     1     1     0     8    0
lockfspl    48    68586    0    68581     1     0     1     1     0     8    0
sessionpl  144       25    0        9     1     0     1     1     0     8    0
pgrppl      48       25    0        9     1     0     1     1     0     8    0
ucredpl    104   617421    0   617411     1     0     1     1     0     8    0
zombiepl   144    68993    0    68986     2     1     1     1     0     8    0
processpl  1136   69032    0    68986     4     0     4     4     0     8    0
procpl     656   138184    0   138123    16     9     7     7     0     8    1
srpgc       96        1    0        1     1     1     0     1     0     8    0
sockpl     664   205913    0   205889     7     4     3     4     0     8    0
mcl8k      8192       1    0        0     1     0     1     1     0     8    0
mcl4k      4096       5    0        0     1     0     1     1     0     8    0
mcl2k      2048     341    0        0    42     1    41    42     0     8    0
mtagpl      96        2    0        0     1     0     1     1     0     8    0
mbufpl     256      444    0        0    23     0    23    23     0     8    0
bufpl      280    72989    0    66734   447     0   447   447     0     8    0
anonpl      24  4004132    0  3997576    82    40    42    64     0   186    0
amapchunkpl 152 1777359    0  1776752    47    18    29    30     0   158    1
amappl16   200    73948    0    73817    13     5     8     8     0     8    0
amappl15   192       12    0       12     1     1     0     1     0     8    0
amappl14   184      163    0      151     2     1     1     2     0     8    0
amappl13   176        6    0        6     1     1     0     1     0     8    0
amappl12   168    69693    0    69666     2     0     2     2     0     8    0
amappl11   160      104    0       93     1     0     1     1     0     8    0
amappl10   152       65    0       55     2     1     1     1     0     8    0
amappl9    144      178    0      177     1     0     1     1     0     8    0
amappl8    136      196    0      128     3     0     3     3     0     8    0
amappl7    128       55    0       44     1     0     1     1     0     8    0
amappl6    120      332    0      317     2     1     1     2     0     8    0
amappl5    112      171    0      159     1     0     1     1     0     8    0
amappl4    104      569    0      536     2     0     2     2     0     8    0
amappl3     96   358128    0   358063     3     0     3     3     0     8    0
amappl2     88    69414    0    69349     4     2     2     4     0     8    0
amappl1     80   216408    0   215926    27    16    11    22     0     8    0
amappl      88   564883    0   564718     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        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    69014    0    68990     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24    69014    0    68990     1     0     1     1     0     8    0
vmmpekpl   168   340537    0   340505     2     0     2     2     0     8    0
vmmpepl    168  2916371    0  2914739   138    57    81   117     0   357    2
vmsppl     440    69013    0    68990     4     0     4     4     0     8    0
rwobjpl     56   669231    0   662255   100     1    99    99     0     8    0
pdppl      4096  138035    0   137980   215   150    65    79     0     8   10
pvpl        32    51128    0        0   407     1   406   406     0   265    0
pmappl     248    69013    0    68990     4     2     2     3     0     8    0
extentpl    40       56    0       38     1     0     1     1     0     8    0
phpool     112      522    0      157    11     0    11    11     0     8    0
ddb{1}> 

Crashes (25):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
2025/10/07 05:04 openbsd f4db8a7c3d37 8ef35d49 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main protection_fault: lf_advlock
2025/10/04 22:57 openbsd cda73d07f20e 770ff59f .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main protection_fault: lf_advlock
2025/09/18 07:07 openbsd 6d22a4a7112d e2beed91 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore protection_fault: lf_advlock
2025/09/16 07:46 openbsd 532f6034b8b3 e2beed91 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main protection_fault: lf_advlock
2025/09/09 15:33 openbsd 3efab2192dd6 d291dd2d .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main protection_fault: lf_advlock
2025/08/29 18:15 openbsd 7c5e7ac95d6c 3e1beec6 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore protection_fault: lf_advlock
2025/08/26 04:55 openbsd 07d23478ec82 bf27483f .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore protection_fault: lf_advlock
2025/08/04 09:22 openbsd 42a7be81bef7 3cda49cf .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main protection_fault: lf_advlock
2025/07/22 09:37 openbsd 522fe508dc11 3cda49cf .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main protection_fault: lf_advlock
2025/07/18 08:59 openbsd aa829d585f3f 3cda49cf .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main protection_fault: lf_advlock
2025/07/17 19:44 openbsd c54b87435855 3cda49cf .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore protection_fault: lf_advlock
2025/07/10 11:42 openbsd 3cb786741c54 d7384b6d .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main protection_fault: lf_advlock
2025/06/23 20:15 openbsd 9729c53212e0 1a7fb460 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main protection_fault: lf_advlock
2025/05/18 10:17 openbsd 6decc3d5f4d6 f41472b0 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore protection_fault: lf_advlock
2025/04/11 03:42 openbsd 5990a1963d9d 94486846 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore protection_fault: lf_advlock
2025/04/02 11:28 openbsd 351a734b4a2d c799dfdd .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore protection_fault: lf_advlock
2025/03/06 19:00 openbsd 03a0e6b8181a 831e3629 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore protection_fault: lf_advlock
2025/03/02 00:19 openbsd 9c635e83c4be c3901742 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main protection_fault: lf_advlock
2025/02/16 16:19 openbsd 3411e7e2a484 40a34ec9 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore protection_fault: lf_advlock
2025/02/15 16:33 openbsd 5c4be1f536db 40a34ec9 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main protection_fault: lf_advlock
2025/02/03 12:31 openbsd db5d28f093d6 a21a8419 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main protection_fault: lf_advlock
2024/10/24 17:37 openbsd ee657da96042 092bf4ab .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-setuid protection_fault: lf_advlock
2024/10/18 04:59 openbsd ef4af84434df 666f77ed .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore protection_fault: lf_advlock
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
* Struck through repros no longer work on HEAD.