The system crashes due to divide error in bdi_dirty_limits() if dirty_thresh equals zero.

Issue

• The system crashes due to divide error in bdi_dirty_limits() if dirty_thresh equals zero.

• The message observed in the console (dmesg/kernel ring buffer):

  [360028.025883] divide error: 0000 [#1] SMP
  [360028.026049] Modules linked in: fuse rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache vmw_vsock_vmci_transport vsock coretemp crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul ppdev glue_helper ablk_helper vmw_balloon cryptd pcspkr sg i2c_piix4 vmw_vmci shpchp parport_pc parport nfsd auth_rpcgss nfs_acl lockd grace sunrpc binfmt_misc ip_tables ext4 mbcache jbd2 sr_mod cdrom sd_mod crc_t10dif crct10dif_generic ata_generic pata_acpi vmwgfx crct10dif_pclmul drm_kms_helper crct10dif_common ttm crc32c_intel serio_raw vmxnet3 drm ata_piix vmw_pvscsi libata i2c_core floppy dm_mirror dm_region_hash dm_log dm_mod
  [360028.027083] CPU: 0 PID: 4542 Comm: java Not tainted 3.10.0-327.el7.x86_64 #1
  [360028.027273] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 10/22/2013
  [360028.027486] task: ffff880126157300 ti: ffff880125108000 task.ti: ffff880125108000
  [360028.027681] RIP: 0010:[<ffffffff8163081e>]  [<ffffffff8163081e>] bdi_dirty_limits+0x3d/0x9d
  [360028.027898] RSP: 0018:ffff88012510bc50  EFLAGS: 00010246
  [360028.028122] RAX: 0000000000000000 RBX: ffff880428b89148 RCX: 28f5c28f5c28f5c3
  [360028.028314] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
  [360028.028508] RBP: ffff88012510bc80 R08: ffff88012510bd50 R09: ffff88012510bd60
  [360028.028696] R10: 57ffa8df96481e80 R11: 0000000000000000 R12: ffff88012510bd50
  [360028.028884] R13: 0000000000000000 R14: ffff88012510bd58 R15: ffff88012510bd60
  [360028.029070] FS:  00007f4700365700(0000) GS:ffff88043fc00000(0000) knlGS:0000000000000000
  [360028.029257] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [360028.029433] CR2: 00007f4700768800 CR3: 0000000035135000 CR4: 00000000000407f0
  [360028.029720] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  [360028.029963] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
  [360028.030158] Stack:
  [360028.030291]  0000000000000000 ffff88011f6a5ca8 ffff8800bbb3d650 ffff880428b89148
  [360028.030488]  ffffea0010481e80 800000041207a067 ffff88012510bd98 ffffffff81630977
  [360028.030714]  ffff88012510bcd0 ffffffff8163879e 000000002510bd10 ffffea0010481e80
  [360028.030914] Call Trace:
  [360028.031054]  [<ffffffff81630977>] balance_dirty_pages.isra.19+0xf9/0x5ff
  [360028.031242]  [<ffffffff8163879e>] ? __wait_on_bit+0x7e/0x90
  [360028.031425]  [<ffffffff812f8e62>] ? radix_tree_lookup_slot+0x22/0x50
  [360028.031625]  [<ffffffff81175517>] balance_dirty_pages_ratelimited+0xe7/0x110
  [360028.031841]  [<ffffffff81192d1b>] __do_fault+0x26b/0x510
  [360028.032044]  [<ffffffff81197088>] handle_mm_fault+0x5b8/0xf50
  [360028.032287]  [<ffffffff812cc124>] ? blk_finish_plug+0x14/0x40
  [360028.032510]  [<ffffffff81191de5>] ? SyS_madvise+0x3c5/0x820
  [360028.032716]  [<ffffffff81640e22>] __do_page_fault+0x152/0x420
  [360028.032918]  [<ffffffff81641113>] do_page_fault+0x23/0x80
  [360028.033103]  [<ffffffff8163d408>] page_fault+0x28/0x30
  [360028.033278] Code: f5 41 54 4d 89 c4 53 48 89 fb 41 52 48 89 55 d0 e8 48 47 b4 ff 4d 85 ff 49 89 04 24 74 13 48 8b 55 d0 45 89 ed 48 0f af c2 31 d2 <49> f7 f5 49 89 07 e8 9a ff ff ff 48 01 c0 49 39 04 24 73 22 31
  [360028.033782] RIP  [<ffffffff8163081e>] bdi_dirty_limits+0x3d/0x9d
  [360028.033964]  RSP <ffff88012510bc50>
  

• Backtrace of panic task:

  crash> bt
  PID: 4542   TASK: ffff880126157300  CPU: 0   COMMAND: "java"
   #0 [ffff88012510b918] machine_kexec at ffffffff81051beb
   #1 [ffff88012510b978] crash_kexec at ffffffff810f2542
   #2 [ffff88012510ba48] oops_end at ffffffff8163e1a8
   #3 [ffff88012510ba70] die at ffffffff8101859b
   #4 [ffff88012510baa0] do_trap at ffffffff8163d860
   #5 [ffff88012510baf0] do_divide_error at ffffffff81014f3e
   #6 [ffff88012510bba0] divide_error at ffffffff81646f8e
      [exception RIP: bdi_dirty_limits+61]
      RIP: ffffffff8163081e  RSP: ffff88012510bc50  RFLAGS: 00010246
      RAX: 0000000000000000  RBX: ffff880428b89148  RCX: 28f5c28f5c28f5c3
      RDX: 0000000000000000  RSI: 0000000000000000  RDI: 0000000000000000
      RBP: ffff88012510bc80   R8: ffff88012510bd50   R9: ffff88012510bd60
      R10: 57ffa8df96481e80  R11: 0000000000000000  R12: ffff88012510bd50
      R13: 0000000000000000  R14: ffff88012510bd58  R15: ffff88012510bd60
      ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
   #7 [ffff88012510bc88] balance_dirty_pages at ffffffff81630977
   #8 [ffff88012510bda0] balance_dirty_pages_ratelimited at ffffffff81175517
   #9 [ffff88012510bdb0] __do_fault at ffffffff81192d1b
  #10 [ffff88012510be40] handle_mm_fault at ffffffff81197088
  #11 [ffff88012510bed0] __do_page_fault at ffffffff81640e22
  #12 [ffff88012510bf28] do_page_fault at ffffffff81641113
  #13 [ffff88012510bf50] page_fault at ffffffff8163d408
      RIP: 00007f471b698bda  RSP: 00007f4700364420  RFLAGS: 00010246
      RAX: 0000000000000000  RBX: 000000000000002a  RCX: 00000000f94d3948
      RDX: 00007f4700768800  RSI: 00007f471169ffb0  RDI: 77453fb02eb5c0ea
      RBP: 00000000f94d3858   R8: 0000000000000000   R9: 0000000000000000
      R10: 0000000000000008  R11: 0000000000000000  R12: 0000000000000000
      R13: 0000000000000200  R14: 00007f4700364380  R15: 00007f46bdf1a800
      ORIG_RAX: ffffffffffffffff  CS: 0033  SS: 002b