syzbot


uvm_fault: hardclock (5)

Status: upstream: reported syz repro on 2023/03/03 14:04
Reported-by: syzbot+21738f9ef88044fa22da@syzkaller.appspotmail.com
First crash: 470d, last: 318d
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd uvm_fault: hardclock (2) 1 861d 861d 0/3 auto-closed as invalid on 2022/05/06 11:22
openbsd uvm_fault: hardclock 1 1011d 1011d 0/3 auto-closed as invalid on 2021/12/07 21:45
openbsd uvm_fault: hardclock (3) 1 742d 742d 0/3 auto-obsoleted due to no activity on 2022/09/02 21:31
openbsd uvm_fault: hardclock (4) 1 599d 599d 0/3 auto-obsoleted due to no activity on 2023/01/23 15:58
Last patch testing requests (5)
Created Duration User Patch Repo Result
2024/04/11 07:29 1m retest repro openbsd error OK
2024/02/01 07:20 9m retest repro openbsd error OK
2023/11/23 07:04 8m retest repro openbsd error OK
2023/09/14 06:45 9m retest repro openbsd error OK
2023/07/06 06:32 8m retest repro openbsd error OK

Sample crash report:
kernel: page fault trap, code=0
Stopped at      hardclock+0x106:        movq    0x260(%r14),%r15
ddb> 
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
the kernel did not panic
ddb> trace
hardclock(ffff800021841ef0) at hardclock+0x106 sys/kern/kern_clock.c:149
clockintr_dispatch(ffff800021841ef0) at clockintr_dispatch+0x1a8 sys/kern/kern_clockintr.c:196
lapic_clockintr(0,0) at lapic_clockintr+0x36 sys/arch/amd64/amd64/lapic.c:483
Xresume_lapic_ltimer() at Xresume_lapic_ltimer+0x26
uvm_objtree_RBT_COMPARE(ffff800021842048,fffffd8005c90480) at uvm_objtree_RBT_COMPARE+0x2b uvm_pagecmp sys/uvm/uvm_page.c:87 [inline]
uvm_objtree_RBT_COMPARE(ffff800021842048,fffffd8005c90480) at uvm_objtree_RBT_COMPARE+0x2b sys/uvm/uvm_page.c:82
_rb_find(ffffffff829e9ed0,fffffd8077d2c0f0,ffff800021842048) at _rb_find+0x58 sys/kern/subr_tree.c:450
uvm_pagelookup(fffffd8077d2c0e0,a5eb000) at uvm_pagelookup+0x44 sys/uvm/uvm_page.c:1239
buf_map(fffffd8077d2c020) at buf_map+0x206 sys/kern/vfs_biomem.c:124
buf_get(0,0,1000ecf0) at buf_get+0x739 sys/kern/vfs_bio.c:1179
geteblk(1000ecf0) at geteblk+0x2c sys/kern/vfs_bio.c:1061
readdisklabel(2902,ffffffff81a39c40,ffff800000cb1000,0) at readdisklabel+0x145 sys/arch/amd64/amd64/disksubr.c:96
vndopen(2902,1,2000,ffff8000217198a8) at vndopen+0x17a sys/dev/vnd.c:203
spec_open(ffff8000218424a8) at spec_open+0x3df sys/kern/spec_vnops.c:150
VOP_OPEN(fffffd807e8e4c28,1,fffffd807f7d7a90,ffff8000217198a8) at VOP_OPEN+0x6c sys/kern/vfs_vops.c:138
vn_open(ffff8000218426f8,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:177
doopenat(ffff8000217198a8,ffffff9c,200022c0,0,0,ffff8000218428d0) at doopenat+0x26a sys/kern/vfs_syscalls.c:1127
syscall(ffff800021842950) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd1b3df64c30, count: -18
ddb> show registers
rdi                              0x3
rsi                                0
rbp               0xffff800021841e20
rbx                              0x1
rdx                             0xd8
rcx                     0x6028b7e200
rax                           0x22a6    __ALIGN_SIZE+0x12a6
r8                                 0
r9                                 0
r10                                0
r11               0xcbd891701a4b1c5e
r12               0xffff8000217198a8
r13                                0
r14                                0
r15                                0
rip               0xffffffff81db7a16    hardclock+0x106
cs                               0x8
rflags                       0x10246    __ALIGN_SIZE+0xf246
rsp               0xffff800021841df0
ss                              0x10
hardclock+0x106:        movq    0x260(%r14),%r15
ddb> show proc
PROC (kernel: page fault trap, code=0
Faulted in DDB; continuing...
ddb> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
ddb> show all locks
No such command
ddb> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 10180   6402K    6414K  78643K     11270        0
            pcb    13      8K       8K  78643K        13        0
         rtable   158      4K       4K  78643K       241        0
         ifaddr    64     18K      18K  78643K        64        0
       counters    28     17K      17K  78643K        28        0
       ioctlops     0      0K       2K  78643K        23        0
          mount     1      1K       1K  78643K         1        0
            log     0      0K       0K  78643K         4        0
         vnodes  1168     73K      73K  78643K      1182        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    20     73K      77K  78643K       109        0
           proc    55     58K      75K  78643K       421        0
    NFS srvsock     1      0K       0K  78643K         1        0
     NFS daemon     1     16K      16K  78643K         1        0
       in_multi    57      3K       3K  78643K        57        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       1K  78643K       338        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     8     62K      64K  78643K        10        0
       UVM amap   196     72K      72K  78643K      2126        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    19      1K       1K  78643K        19        0
           temp    51   5754K    5817K  78643K      3584        0
         kqueue    12     18K      18K  78643K        25        0
      SYN cache     2     16K      16K  78643K         2        0
ddb> show all pools
Name      Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb      120       28    0       25     1     0     1     1     0     8    0
rtentry    112       73    0        1     3     0     3     3     0     8    0
unpcb      144       33    0       20     1     0     1     1     0     8    0
syncache   296        5    0        5     2     1     1     1     0     8    1
tcpqe       32       27    0       27     1     1     0     1     0     8    0
tcpcb      776        8    0        5     1     0     1     1     0     8    0
arp         88       12    0        0     1     0     1     1     0     8    0
inpcb      336       51    0       45     1     0     1     1     0     8    0
nd6         48       12    0        0     1     0     1     1     0     8    0
art_heap8  4096       1    0        0     1     0     1     1     0     8    0
art_heap4  256      283    0        0    18     0    18    18     0     8    0
art_table   32      284    0        0     3     0     3     3     0     8    0
art_node    16       72    0        6     1     0     1     1     0     8    0
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dirhash: pool(0xffffffff82bd74a8:dirhash): free list modified: page 0xffff8000216b1000; item ordinal 0; addr 0xffff8000216b1400 (p 0xfffffd806eddc000); offset 0x0=0x0
pool(dirhash): free list modified: page 0xffff8000216b1000; item ordinal 0; addr 0xffff8000216b1400 (p 0xfffffd806eddc000); offset 0x0=0x0
dirhash: pool(0xffffffff82bd74a8:dirhash): page inconsistency: page 0xffff8000216b1000; item ordinal 1; addr 0x141c1b00baba3640
dino2pl    256     1480    0       53    90     0    90    90     0     8    0
ffsino     240     1480    0       53    84     0    84    84     0     8    0
nchpl      144     1736    0       61    63     0    63    63     0     8    0
uvmvnodes   80     1490    0        0    31     0    31    31     0     8    0
vnodes     216     1490    0        0    83     0    83    83     0     8    0
namei      1024    5788    0     5788     4     1     3     3     0     8    3
namei: pool(0xffffffff82c74a18:namei): free list modified: page 0xffff800021683000; item ordinal 0; addr 0xffff800021684400 (p 0xfffffd806a746000); offset 0x0=0x0
pool(namei): free list modified: page 0xffff800021683000; item ordinal 0; addr 0xffff800021684400 (p 0xfffffd806a746000); offset 0x0=0x0
namei: pool(0xffffffff82c74a18:namei): page inconsistency: page 0xffff800021683000; item ordinal 1; addr 0x9769284ce4d23983
namei: pool(0xffffffff82c74a18:namei): free list modified: page 0xffff80002165f000; item ordinal 0; addr 0xffff800021660400 (p 0xfffffd80782b4000); offset 0x0=0x0
pool(namei): free list modified: page 0xffff80002165f000; item ordinal 0; addr 0xffff800021660400 (p 0xfffffd80782b4000); offset 0x0=0x0
namei: pool(0xffffffff82c74a18:namei): page inconsistency: page 0xffff80002165f000; item ordinal 1; addr 0x405eef52b8f397d7
namei: pool(0xffffffff82c74a18:namei): free list modified: page 0xffff80002168b000; item ordinal 0; addr 0xffff80002168c800 (p 0xfffffd806a746000); offset 0x0=0x0
pool(namei): free list modified: page 0xffff80002168b000; item ordinal 0; addr 0xffff80002168c800 (p 0xfffffd806a746000); offset 0x0=0x0
namei: pool(0xffffffff82c74a18:namei): page inconsistency: page 0xffff80002168b000; item ordinal 1; addr 0x5b1f8ec5d663c37
kstatmem   264       22    0        0     2     0     2     2     0     8    0
scxspl     216     6240    0     6240    22    21     1     8     0     8    1
plimitpl   152       25    0       10     1     0     1     1     0     8    0
sigapl     424      408    0      361     6     0     6     6     0     8    0
futexpl     64        8    0        7     1     0     1     1     0     8    0
knotepl    120     4236    0     4150     5     1     4     4     0     8    0
kqueuepl   184       21    0       13     1     0     1     1     0     8    0
pipepl     288      135    0      107     4     1     3     3     0     8    1
fdescpl    432      392    0      361     4     0     4     4     0     8    0
filepl     120     1518    0     1389     4     0     4     4     0     8    0
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       25    0        9     1     0     1     1     0     8    0
pgrppl      48       25    0        9     1     0     1     1     0     8    0
ucredpl    104       67    0       56     1     0     1     1     0     8    0
zombiepl   144      361    0      361     2     1     1     1     0     8    1
processpl  1008     408    0      361     8     1     7     7     0     8    0
processpl: pool(0xffffffff82cf3698:processpl): page inconsistency: page 0x0; at page head addr 0xffff800021713f90 (p 0xffff800021712000)
procpl     696      419    0      361     7     1     6     6     0     8    0
procpl: pool(0xffffffff82cf34f0:procpl): page inconsistency: page 0x0; at page head addr 0xffff800021719f90 (p 0xffff800021718000)
sockpl     456      112    0       90     5     1     4     4     0     8    1
mcl8k      8192       9    0        9     2     1     1     1     0     8    1
mcl4k      4096       5    0        5     2     1     1     1     0     8    1
mcl2k      2048   10824    0    10750    35    25    10    34     0     8    0
mtagpl      96        4    0        4     1     1     0     1     0     8    0
mbufpl     256    18158    0    17964    27    14    13    21     0     8    0
bufpl      288     3986    0      145   275     0   275   275     0     8    0
anonpl      24   111820    0   106748    68    13    55    55     0   188   23
amapchunkpl 152    6006    0     5636    21     1    20    20     0   158    5
amappl16   200     2077    0     2016    10     5     5     5     0     8    0
amappl15   192       10    0       10     1     1     0     1     0     8    0
amappl14   184      152    0      139     2     0     2     2     0     8    0
amappl13   176       13    0       12     2     1     1     1     0     8    0
amappl12   168      371    0      367     2     1     1     1     0     8    0
amappl11   160       45    0       35     1     0     1     1     0     8    0
amappl10   152       49    0       40     2     1     1     1     0     8    0
amappl9    144      945    0      945     2     1     1     1     0     8    1
amappl8    136      110    0       86     3     1     2     2     0     8    1
amappl7    128      125    0      110     2     0     2     2     0     8    0
amappl6    120      153    0      144     2     0     2     2     0     8    1
amappl5    112      108    0      102     1     0     1     1     0     8    0
amappl4    104      459    0      432     2     0     2     2     0     8    1
amappl3     96      516    0      474     2     0     2     2     0     8    0
amappl2     88      728    0      660     3     0     3     3     0     8    1
amappl1     80    11529    0    10855    29     3    26    26     0     8   11
amappl      88     1687    0     1568     3     0     3     3     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      392    0      361     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      392    0      361     1     0     1     1     0     8    0
vmmpekpl   168     9593    0     9565     2     0     2     2     0     8    0
vmmpepl    168    42800    0    40897   135     9   126   126     0   357   43
vmsppl     344      391    0      361     3     0     3     3     0     8    0
rwobjpl     24    15319    0    12804    21     1    20    20     0     8    3
pdppl      4096     790    0      722    92    22    70    70     0     8    2
pvpl        32   305788    0   296044   366    21   345   345     0   265  265
pmappl     216      391    0      361     2     0     2     2     0     8    0
extentpl    40       56    0       38     1     0     1     1     0     8    0
phpool     112      641    0       67    17     0    17    17     0     8    0
ddb> machine ddbcpu 0
No such command
ddb> trace
hardclock(ffff800021841ef0) at hardclock+0x106 sys/kern/kern_clock.c:149
clockintr_dispatch(ffff800021841ef0) at clockintr_dispatch+0x1a8 sys/kern/kern_clockintr.c:196
lapic_clockintr(0,0) at lapic_clockintr+0x36 sys/arch/amd64/amd64/lapic.c:483
Xresume_lapic_ltimer() at Xresume_lapic_ltimer+0x26
uvm_objtree_RBT_COMPARE(ffff800021842048,fffffd8005c90480) at uvm_objtree_RBT_COMPARE+0x2b uvm_pagecmp sys/uvm/uvm_page.c:87 [inline]
uvm_objtree_RBT_COMPARE(ffff800021842048,fffffd8005c90480) at uvm_objtree_RBT_COMPARE+0x2b sys/uvm/uvm_page.c:82
_rb_find(ffffffff829e9ed0,fffffd8077d2c0f0,ffff800021842048) at _rb_find+0x58 sys/kern/subr_tree.c:450
uvm_pagelookup(fffffd8077d2c0e0,a5eb000) at uvm_pagelookup+0x44 sys/uvm/uvm_page.c:1239
buf_map(fffffd8077d2c020) at buf_map+0x206 sys/kern/vfs_biomem.c:124
buf_get(0,0,1000ecf0) at buf_get+0x739 sys/kern/vfs_bio.c:1179
geteblk(1000ecf0) at geteblk+0x2c sys/kern/vfs_bio.c:1061
readdisklabel(2902,ffffffff81a39c40,ffff800000cb1000,0) at readdisklabel+0x145 sys/arch/amd64/amd64/disksubr.c:96
vndopen(2902,1,2000,ffff8000217198a8) at vndopen+0x17a sys/dev/vnd.c:203
spec_open(ffff8000218424a8) at spec_open+0x3df sys/kern/spec_vnops.c:150
VOP_OPEN(fffffd807e8e4c28,1,fffffd807f7d7a90,ffff8000217198a8) at VOP_OPEN+0x6c sys/kern/vfs_vops.c:138
vn_open(ffff8000218426f8,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:177
doopenat(ffff8000217198a8,ffffff9c,200022c0,0,0,ffff8000218428d0) at doopenat+0x26a sys/kern/vfs_syscalls.c:1127
syscall(ffff800021842950) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd1b3df64c30, count: -18
ddb> machine ddbcpu 1
No such command
ddb> trace
hardclock(ffff800021841ef0) at hardclock+0x106 sys/kern/kern_clock.c:149
clockintr_dispatch(ffff800021841ef0) at clockintr_dispatch+0x1a8 sys/kern/kern_clockintr.c:196
lapic_clockintr(0,0) at lapic_clockintr+0x36 sys/arch/amd64/amd64/lapic.c:483
Xresume_lapic_ltimer() at Xresume_lapic_ltimer+0x26
uvm_objtree_RBT_COMPARE(ffff800021842048,fffffd8005c90480) at uvm_objtree_RBT_COMPARE+0x2b uvm_pagecmp sys/uvm/uvm_page.c:87 [inline]
uvm_objtree_RBT_COMPARE(ffff800021842048,fffffd8005c90480) at uvm_objtree_RBT_COMPARE+0x2b sys/uvm/uvm_page.c:82
_rb_find(ffffffff829e9ed0,fffffd8077d2c0f0,ffff800021842048) at _rb_find+0x58 sys/kern/subr_tree.c:450
uvm_pagelookup(fffffd8077d2c0e0,a5eb000) at uvm_pagelookup+0x44 sys/uvm/uvm_page.c:1239
buf_map(fffffd8077d2c020) at buf_map+0x206 sys/kern/vfs_biomem.c:124
buf_get(0,0,1000ecf0) at buf_get+0x739 sys/kern/vfs_bio.c:1179
geteblk(1000ecf0) at geteblk+0x2c sys/kern/vfs_bio.c:1061
readdisklabel(2902,ffffffff81a39c40,ffff800000cb1000,0) at readdisklabel+0x145 sys/arch/amd64/amd64/disksubr.c:96
vndopen(2902,1,2000,ffff8000217198a8) at vndopen+0x17a sys/dev/vnd.c:203
spec_open(ffff8000218424a8) at spec_open+0x3df sys/kern/spec_vnops.c:150
VOP_OPEN(fffffd807e8e4c28,1,fffffd807f7d7a90,ffff8000217198a8) at VOP_OPEN+0x6c sys/kern/vfs_vops.c:138
vn_open(ffff8000218426f8,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:177
doopenat(ffff8000217198a8,ffffff9c,200022c0,0,0,ffff8000218428d0) at doopenat+0x26a sys/kern/vfs_syscalls.c:1127
syscall(ffff800021842950) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd1b3df64c30, count: -18

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/03/03 15:32 openbsd 1e5b016c5082 f8902b57 .config console log report syz [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: hardclock
2023/08/02 18:10 openbsd 40d57955f2f1 b178af49 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: hardclock
2023/04/27 06:31 openbsd 1e5b016c5082 19a3dabe .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: hardclock
2023/03/03 14:03 openbsd 1e5b016c5082 f8902b57 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: hardclock
* Struck through repros no longer work on HEAD.