Hi, Dave I have met the same issue now but in 3.10.0-514.16.1.el7.x86_64, the issue also accurred in last November. I read 3.10.0-514.16.1.el7.x86_64, the bit9~13 is the swap type, because the swap has been swapoff on my machine, for the "Bad swap file entry" error, the bit9~13 should be zero, but "Unused swap file entry" error is exist although the bit9~13 is zero. The lower 12 bits of pte is zero, and all abnormal ptes are serial in a mmu page, so I guess the mmu page has been overwritten by someone. The message details: kernel: swap_free: Bad swap file entry 1000000000103256 kernel: BUG: Bad page map in process in:imjournal pte:8192b1000 pmd:3ff9324067 kernel: addr:00007f920adc5000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:3f8 kernel: vma->vm_ops->fault: shmem_fault+0x0/0x1d0 kernel: vma->vm_file->f_op->mmap: shmem_mmap+0x0/0x30 kernel: CPU: 5 PID: 9166 Comm: in:imjournal Tainted: G W OE K------------ 3.10.0-514.16.1.el7.x86_64 #1 kernel: Hardware name: HP ProLiant DL380 Gen9/ProLiant DL380 Gen9, BIOS P89 04/25/2017 kernel: 00007f920adc5000 0000000023409e11 ffff881fc769fc78 ffffffff81686ac3 kernel: ffff881fc769fcc0 ffffffff811acacf 00000008192b1000 00000000000003f8 kernel: ffff883ff9324e28 00000008192b1000 00007f920ae00000 00007f920adc5000 kernel: Call Trace: kernel: [<ffffffff81686ac3>] dump_stack+0x19/0x1b kernel: [<ffffffff811acacf>] print_bad_pte+0x1af/0x250 kernel: [<ffffffff811aea7b>] unmap_page_range+0x62b/0x8a0 kernel: [<ffffffff811aed71>] unmap_single_vma+0x81/0xf0 kernel: [<ffffffff811afc49>] unmap_vmas+0x49/0x90 kernel: [<ffffffff811b488e>] unmap_region+0xbe/0x140 kernel: [<ffffffff811b6c75>] do_munmap+0x245/0x420 kernel: [<ffffffff811b6e91>] vm_munmap+0x41/0x60 kernel: [<ffffffff811b7e22>] SyS_munmap+0x22/0x30 kernel: [<ffffffff81697189>] system_call_fastpath+0x16/0x1b kernel: Disabling lock debugging due to kernel taint kernel: swap_free: Bad swap file entry 3000000000006986 kernel: BUG: Bad page map in process in:imjournal pte:34c33000 pmd:3ff9324067 kernel: addr:00007f920adc6000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:3f9 kernel: vma->vm_ops->fault: shmem_fault+0x0/0x1d0 kernel: vma->vm_file->f_op->mmap: shmem_mmap+0x0/0x30 $ cat messages | grep swap_free kernel: swap_free: Bad swap file entry 1000000000103256 kernel: swap_free: Bad swap file entry 3000000000006986 kernel: swap_free: Bad swap file entry 2000000000006986 kernel: swap_free: Unused swap file entry 00102e07 kernel: swap_free: Bad swap file entry 1000000000102e00 kernel: swap_free: Bad swap file entry 2000000000107fd0 kernel: swap_free: Bad swap file entry 2000000000006a88 kernel: swap_free: Bad swap file entry 3000000000103e67 kernel: swap_free: Bad swap file entry 300000000010324c kernel: swap_free: Bad swap file entry 3000000000102e00 kernel: swap_free: Unused swap file entry 00102a56 kernel: swap_free: Unused swap file entry 00102ef5 kernel: swap_free: Bad swap file entry 3000000000102ef5 kernel: swap_free: Bad swap file entry 1000000000102a4f kernel: swap_free: Bad swap file entry 3000000000103262 kernel: swap_free: Bad swap file entry 10000000001031c4 kernel: swap_free: Unused swap file entry 00006981 kernel: swap_free: Unused swap file entry 00006a88 kernel: swap_free: Bad swap file entry 3000000000102e00 kernel: swap_free: Bad swap file entry 3000000000102e08 kernel: swap_free: Unused swap file entry 000069d3 kernel: swap_free: Bad swap file entry 300000000010313a kernel: swap_free: Unused swap file entry 0000699d kernel: swap_free: Unused swap file entry 00006998 kernel: swap_free: Bad swap file entry 3000000000102e07 kernel: swap_free: Bad swap file entry 3000000000102e09 kernel: swap_free: Bad swap file entry 1000000000103174 kernel: swap_free: Bad swap file entry 2000000000102e76 kernel: swap_free: Bad swap file entry 1000000000102651 kernel: swap_free: Bad swap file entry 3000000000102efa kernel: swap_free: Bad swap file entry 3000000000102d40 kernel: swap_free: Bad swap file entry 3000000000101cf5 kernel: swap_free: Bad swap file entry 10000000000069b5 kernel: swap_free: Bad swap file entry 100000000010264e kernel: swap_free: Unused swap file entry 000069e8 kernel: swap_free: Bad swap file entry 20000000000069e8 kernel: swap_free: Bad swap file entry 20000000001021d2 kernel: swap_free: Unused swap file entry 0002e892 kernel: swap_free: Bad swap file entry 2000000000102a48 kernel: swap_free: Bad swap file entry 3000000000102dde kernel: swap_free: Unused swap file entry 001027f2 kernel: swap_free: Bad swap file entry 200000000000ddf5 kernel: swap_free: Bad swap file entry 10000000000fd7e1 kernel: swap_free: Bad swap file entry 1000000000003215 kernel: swap_free: Bad swap file entry 10000000000f3555 kernel: swap_free: Bad swap file entry 20000000000f3555 kernel: swap_free: Bad swap file entry 20000000000fd494 kernel: swap_free: Bad swap file entry 30000000000fd494 kernel: swap_free: Bad swap file entry 10000000001027ec kernel: swap_free: Bad swap file entry 1000000000103172 kernel: swap_free: Unused swap file entry 001039b2 kernel: swap_free: Unused swap file entry 001014da kernel: swap_free: Bad swap file entry 20000000000fd8ea kernel: swap_free: Bad swap file entry 100000000010036e kernel: swap_free: Bad swap file entry 200000000010036e kernel: swap_free: Bad swap file entry 30000000000f6ced kernel: swap_free: Bad swap file entry 3000000000006a8f kernel: swap_free: Bad swap file entry 2000000000102e2a kernel: swap_free: Bad swap file entry 1000000000107bc5 $ cat messages | grep pmd kernel: BUG: Bad page map in process in:imjournal pte:8192b1000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:34c33000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:34c32000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:81703c000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:817001000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:83fe82000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:35442000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:81f33b000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:819263000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:817007000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:8152b0000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:8177a8000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:8177ab000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:815279000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:819317000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:818e25000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:34c0c000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:35440000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:817003000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:817047000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:34e98000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:8189d3000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:34cec000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:34cc0000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:81703f000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:81704b000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:818ba5000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:8173b6000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:81328d000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:8177d3000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:816a03000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:80e7af000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:34da9000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:813271000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:34f40000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:34f42000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:810e92000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:174494000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:815242000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:816ef7000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:813f90000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:6efae000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:7ebf0d000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:190ad000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:79aaa9000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:79aaaa000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:7ea4a6000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:7ea4a7000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:813f61000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:818b91000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:81cd94000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:80a6d4000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:7ec752000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:801b75000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:801b76000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:7b676f000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:3547b000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:817152000 pmd:3ff9324067 kernel: BUG: Bad page map in process in:imjournal pte:83de29000 pmd:3ff9324067 $ cat messages | grep addr kernel: addr:00007f920adc5000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:3f8 kernel: addr:00007f920adc6000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:3f9 kernel: addr:00007f920adc7000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:3fa kernel: addr:00007f920adc8000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:3fb kernel: addr:00007f920adc9000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:3fc kernel: addr:00007f920adca000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:3fd kernel: addr:00007f920adcb000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:3fe kernel: addr:00007f920adcc000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:3ff kernel: addr:00007f920adcd000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:400 kernel: addr:00007f920adce000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:401 kernel: addr:00007f920adcf000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:402 kernel: addr:00007f920add0000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:403 kernel: addr:00007f920add1000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:404 kernel: addr:00007f920add2000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:405 kernel: addr:00007f920add3000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:406 kernel: addr:00007f920add4000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:407 kernel: addr:00007f920add5000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:408 kernel: addr:00007f920add6000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:409 kernel: addr:00007f920add7000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:40a kernel: addr:00007f920add8000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:40b kernel: addr:00007f920add9000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:40c kernel: addr:00007f920adda000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:40d kernel: addr:00007f920addb000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:40e kernel: addr:00007f920addc000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:40f kernel: addr:00007f920addd000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:410 kernel: addr:00007f920adde000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:411 kernel: addr:00007f920addf000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:412 kernel: addr:00007f920ade0000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:413 kernel: addr:00007f920ade1000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:414 kernel: addr:00007f920ade2000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:415 kernel: addr:00007f920ade3000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:416 kernel: addr:00007f920ade4000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:417 kernel: addr:00007f920ade5000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:418 kernel: addr:00007f920ade6000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:419 kernel: addr:00007f920ade7000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:41a kernel: addr:00007f920ade8000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:41b kernel: addr:00007f920ade9000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:41c kernel: addr:00007f920adea000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:41d kernel: addr:00007f920adeb000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:41e kernel: addr:00007f920adec000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:41f kernel: addr:00007f920aded000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:420 kernel: addr:00007f920adee000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:421 kernel: addr:00007f920adef000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:422 kernel: addr:00007f920adf0000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:423 kernel: addr:00007f920adf1000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:424 kernel: addr:00007f920adf2000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:425 kernel: addr:00007f920adf3000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:426 kernel: addr:00007f920adf4000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:427 kernel: addr:00007f920adf5000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:428 kernel: addr:00007f920adf6000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:429 kernel: addr:00007f920adf7000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:42a kernel: addr:00007f920adf8000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:42b kernel: addr:00007f920adf9000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:42c kernel: addr:00007f920adfa000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:42d kernel: addr:00007f920adfb000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:42e kernel: addr:00007f920adfc000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:42f kernel: addr:00007f920adfd000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:430 kernel: addr:00007f920adfe000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:431 kernel: addr:00007f920adff000 vm_flags:080000d1 anon_vma: (null) mapping:ffff883fe5284960 index:432 Thanks. Huaitong Han 2018-04-20 2:53 GMT+08:00 Dave Hansen <dave.hansen@xxxxxxxxx>: > On 04/18/2018 10:40 PM, Fengguang Wu wrote: >> [ 716.494065] PASS concurrent_autogo_5ghz_ht40 4.803608 2018-03-23 09:57:21.586794 >> [ 716.494069] >> [ 716.496923] passed all 1 test case(s) >> [ 716.496926] >> [ 716.511702] swap_info_get: Bad swap file entry 04000000 >> [ 716.512731] BUG: Bad page map in process python2 pte:100_0000_0000 pmd:17e8be067 >> [ 716.513844] addr:00000000860ba23b vm_flags:00000070 anon_vma: (null) mapping:000000004c76fece index:1e2 >> [ 716.515160] file:libpcre.so.3.13.3 fault:filemap_fault mmap:generic_file_mmap readpage:simple_readpage >> [ 716.516418] CPU: 2 PID: 8907 Comm: python2 Not tainted 4.16.0-rc5 #1 >> [ 716.517533] Hardware name: /DH67GD, BIOS BLH6710H.86A.0132.2011.1007.1505 10/07/2011 > > Did you say that you have a few more examples of this? > > I would be really interested if it's always python or always the same > shared library, or always file-backed memory, always the same bit, > etc... From the vm_flags, I'd guess that this is the "rw-p" part of the > file mapping. > > The bit that gets set is really weird. It's bit 40. I could definitely > see scenarios where we might set the dirty bit, or even NX for that > matter, or some *bit* that we mess with in software. It's not even > close to the boundary where it could represent a swapoffset=1 or swapfile=1. > > It's also unlikely to be _PAGE_PSE having gone missing from the PMD > since it's in the middle of a file-backed mapping and the PMD is > obviously pointing to a 4k page. > > If I had to put money on it, I'd guess it's a hardware bit flip, or less > likely, a rogue software bit flip. But, more examples will hopefully > shed some more light. >
