New: Bad page map in process during boot
https://bugzilla.kernel.org/show_bug.cgi?id=203107
Bug ID: 203107
Summary: Bad page map in process during boot
Product: File System
Version: 2.5
Kernel Version: 5.0.5
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext4
Assignee: [email protected]
Reporter: [email protected]
Regression: NoError occurs randomly at boot after upgrading kernel from 5.0.0 to 5.0.4.
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Quoted 18 lines · On Fri 29-03-19 20:46:22, [email protected] wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=203107
Bug ID: 203107 Summary: Bad page map in process during boot Product: File System Version: 2.5 Kernel Version: 5.0.5 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: ext4 Assignee: [email protected] Reporter: [email protected] Regression: No
Quoted 3 lines
Error occurs randomly at boot after upgrading kernel from 5.0.0 to 5.0.4.
I don't think this is an ext4 error. Sure this is an error in file mapping of libblkid.so.1.1.0 (which is handled by ext4) but the filesystem has very little to say wrt how or which PTEs are installed. And the problem is that invalid PTE (dead000000000100) is present in page tables. So this looks more like a problem in MM itself. Adding MM guys to CC.
Honza
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Jan Kara <[email protected]> SUSE Labs, CR
[Bug 203107] Bad page map in process during boot
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=203107
--- Comment #1 from Jan Kara ([email protected]) ---
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Quoted 18 lines · On Fri 29-03-19 20:46:22, [email protected] wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=203107
Bug ID: 203107 Summary: Bad page map in process during boot Product: File System Version: 2.5 Kernel Version: 5.0.5 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: ext4 Assignee: [email protected] Reporter: [email protected] Regression: No
Quoted 3 lines
Error occurs randomly at boot after upgrading kernel from 5.0.0 to 5.0.4.
I don't think this is an ext4 error. Sure this is an error in file mapping of libblkid.so.1.1.0 (which is handled by ext4) but the filesystem has very little to say wrt how or which PTEs are installed. And the problem is that invalid PTE (dead000000000100) is present in page tables. So this looks more like a problem in MM itself. Adding MM guys to CC.
Honza
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[Bug 203107] Bad page map in process during boot
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=203107
--- Comment #2 from [email protected] ---
Thank you.
Quoted 43 lines · On April 2, 2019 3:33:49 AM PDT, [email protected] wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=203107
--- Comment #1 from Jan Kara ([email protected]) ---
Switching to email...Quoted 18 lines · On Fri 29-03-19 20:46:22, [email protected] wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=203107
Bug ID: 203107 Summary: Bad page map in process during boot Product: File System Version: 2.5 Kernel Version: 5.0.5 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: ext4 Assignee: [email protected] Reporter: [email protected] Regression: NoQuoted 1 line
Error occurs randomly at boot after upgrading kernel from 5.0.0 to
5.0.4.
Quoted 2 lines
I don't think this is an ext4 error. Sure this is an error in file mapping
of libblkid.so.1.1.0 (which is handled by ext4) but the filesystem has very
little to say wrt how or which PTEs are installed. And the problem is that
invalid PTE (dead000000000100) is present in page tables. So this looks more like a problem in MM itself. Adding MM guys to CC.Honza
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Quoted 23 lines · Jan Kara
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Quoted 20 lines · On Fri 29-03-19 20:46:22, [email protected] wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=203107
Bug ID: 203107 Summary: Bad page map in process during boot Product: File System Version: 2.5 Kernel Version: 5.0.5 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: ext4 Assignee: [email protected] Reporter: [email protected] Regression: NoError occurs randomly at boot after upgrading kernel from 5.0.0 to 5.0.4.
Quoted 7 lines
Quoted 1 line
I don't think this is an ext4 error. Sure this is an error in file mapping of libblkid.so.1.1.0 (which is handled by ext4) but the filesystem has very little to say wrt how or which PTEs are installed. And the problem is that invalid PTE (
dead000000000100) is present in page tables. So this looks more like a problem in MM itself. Adding MM guys to CC.
0xdead000000000100 and 0xdead000000000200 are LIST_POISON1 and LIST_POISON2 repectively. Have no idea how would they end up in page table.
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Kirill A. Shutemov
[Bug 203107] Bad page map in process during boot
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=203107
--- Comment #3 from Kirill A. Shutemov ([email protected]) ---
Quoted 23 lines · Jan Kara
Switching to email...
Quoted 20 lines · On Fri 29-03-19 20:46:22, [email protected] wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=203107
Bug ID: 203107 Summary: Bad page map in process during boot Product: File System Version: 2.5 Kernel Version: 5.0.5 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: ext4 Assignee: [email protected] Reporter: [email protected] Regression: NoError occurs randomly at boot after upgrading kernel from 5.0.0 to 5.0.4.
Quoted 7 lines
Quoted 1 line
I don't think this is an ext4 error. Sure this is an error in file mapping of libblkid.so.1.1.0 (which is handled by ext4) but the filesystem has very little to say wrt how or which PTEs are installed. And the problem is that invalid PTE (
dead000000000100) is present in page tables. So this looks more like a problem in MM itself. Adding MM guys to CC.
0xdead000000000100 and 0xdead000000000200 are LIST_POISON1 and LIST_POISON2 repectively. Have no idea how would they end up in page table.
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Quoted 26 lines · Kirill A. Shutemov
Quoted 25 lines · Jan Kara
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Quoted 21 lines · On Fri 29-03-19 20:46:22, [email protected] wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=203107
Bug ID: 203107 Summary: Bad page map in process during boot Product: File System Version: 2.5 Kernel Version: 5.0.5 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: ext4 Assignee: [email protected] Reporter: [email protected] Regression: NoError occurs randomly at boot after upgrading kernel from 5.0.0 to 5.0.4.
Quoted 8 lines
Quoted 5 lines
I don't think this is an ext4 error. Sure this is an error in file mapping of libblkid.so.1.1.0 (which is handled by ext4) but the filesystem has very little to say wrt how or which PTEs are installed. And the problem is that invalid PTE (
dead000000000100) is present in page tables. So this looks more like a problem in MM itself. Adding MM guys to CC.
0xdead000000000100and0xdead000000000200areLIST_POISON1andLIST_POISON2repectively. Have no idea how would they end up in page table.
It's possible that CONFIG_DEBUG_LIST could catch the issue. Between 5.0.0 to 5.0.4 it should be also relatively easy to bisect with the stable git tree [1], although if it happens randomly, you need to perform enough attempts to accurately determine which commit is "good".
[1] git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
[Bug 203107] Bad page map in process during boot
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=203107
--- Comment #4 from Vlastimil Babka ([email protected]) ---
Quoted 26 lines · Kirill A. Shutemov
Quoted 25 lines · Jan Kara
Switching to email...
Quoted 21 lines · On Fri 29-03-19 20:46:22, [email protected] wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=203107
Bug ID: 203107 Summary: Bad page map in process during boot Product: File System Version: 2.5 Kernel Version: 5.0.5 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: ext4 Assignee: [email protected] Reporter: [email protected] Regression: NoError occurs randomly at boot after upgrading kernel from 5.0.0 to 5.0.4.
Quoted 8 lines
Quoted 5 lines
I don't think this is an ext4 error. Sure this is an error in file mapping of libblkid.so.1.1.0 (which is handled by ext4) but the filesystem has very little to say wrt how or which PTEs are installed. And the problem is that invalid PTE (
dead000000000100) is present in page tables. So this looks more like a problem in MM itself. Adding MM guys to CC.
0xdead000000000100and0xdead000000000200areLIST_POISON1andLIST_POISON2repectively. Have no idea how would they end up in page table.
It's possible that CONFIG_DEBUG_LIST could catch the issue. Between 5.0.0 to 5.0.4 it should be also relatively easy to bisect with the stable git tree [1], although if it happens randomly, you need to perform enough attempts to accurately determine which commit is "good".
[1] git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
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