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Date: Tue, 11 Jun 2024 12:32:44 +0200
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Subject: Re: LTP: fork13: kernel panic on rk3399-rock-pi-4 running mainline
 6.10.rc3
To: Naresh Kamboju <naresh.kamboju@linaro.org>,
 open list <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>,
 lkft-triage@lists.linaro.org, Linux Regressions <regressions@lists.linux.dev>
Cc: Andrew Morton <akpm@linux-foundation.org>, willy@infradead.org,
 Kefeng Wang <wangkefeng.wang@huawei.com>, Barry Song <baohua@kernel.org>,
 Ryan Roberts <ryan.roberts@arm.com>,
 Baolin Wang <baolin.wang@linux.alibaba.com>,
 "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>,
 Dan Carpenter <dan.carpenter@linaro.org>, Arnd Bergmann <arnd@arndb.de>,
 Anders Roxell <anders.roxell@linaro.org>
References: <CA+G9fYvKmr84WzTArmfaypKM9+=Aw0uXCtuUKHQKFCNMGJyOgQ@mail.gmail.com>
From: David Hildenbrand <david@redhat.com>
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On 11.06.24 12:14, Naresh Kamboju wrote:
> The kernel panic was noticed while running LTP syscalls fork13 (long running) on
> the mainline master 6.10.rc3 kernel on arm64 rk3399-rock-pi-4 device.
> 
> Please find detailed logs in the links,
> 
> As you know fork13 is a stress test case trying to generate a maximum number
> of PID's in a 100,000 loop.
> 
> This device is running via NFS mounted filesystem.
> 
> I have tried to reproduce this problem in a loop but failed to reproduce the
> crash.
> 
> 
> Crash flow:
> ------
> fork13 run started
> BUG: Bad page map in process fork13
> BUG: Bad rss-counter state mm:
> Unable to handle kernel paging request at virtual address
> Internal error: Oops: 0000000096000046
> run for 800 secs ( 13 minutes) and more.
> fork14 run started and completed
> 
> fpathconf01 run started and completed
> sugov:
> 
> Unable to handle kernel NULL pointer dereference at virtual address
> 
> Insufficient stack space to handle exception!
> end Kernel panic - not syncing: kernel stack overflow
> 
> I have tried to decode stack dump by not being useful [1].
> [1] https://people.linaro.org/~naresh.kamboju/output-rk3399.txt
> 
> Test log :
> --------
> tst_test.c:1733: TINFO: LTP version: 20240524
> tst_test.c:1617: TINFO: Timeout per run is 0h 15m 00s
> [  904.280569] BUG: Bad page map in process fork13  pte:2000000019ffc3
> pmd:80000000df55003
> [  904.281397] page: refcount:1 mapcount:-1 mapping:0000000000000000
> index:0x0 pfn:0x19f

Mapcount underflow on a small folio (head: not printed).

[...]

> [  904.294564] BUG: Bad page map in process fork13  pte:200000002e4fc3
> pmd:80000000df55003
> [  904.295275] page: refcount:2 mapcount:-1 mapping:000000007885152f
> index:0x6 pfn:0x2e4

Another mapcount underflow on a small folio (head: not printed).


> [  904.309309] BUG: Bad page map in process fork13  pte:20000000cc6fc3
> pmd:80000000df55003
> [  904.310031] page: refcount:1 mapcount:-1 mapping:0000000000000000
> index:0x6 pfn:0xcc6
> [  904.310728] head: order:3 mapcount:-1 entire_mapcount:0
> nr_pages_mapped:8388607 pincount:0

Mapcount underflow on a large folio.

...

> [  904.326666] BUG: Bad page map in process fork13  pte:20000000268fc3
> pmd:80000000df55003
> [  904.327390] page: refcount:1 mapcount:-1 mapping:00000000f0624181
> index:0x1b pfn:0x268

Another mapcount underflow on a small folio (head: not printed).

> [  904.328094] memcg:ffff0000016b4000
> [  904.328401] aops:nfs_file_aops ino:8526e6 dentry
> name:"libgpg-error.so.0.36.0"
> [  904.329051] flags:
> 0x3fffe000000002c(referenced|uptodate|lru|node=0|zone=0|lastcpupid=0x1ffff)
> [  904.329878] raw: 03fffe000000002c fffffdffc0009a48 fffffdffc022f3c8
> ffff00000688bd60
> [  904.330561] raw: 000000000000001b 0000000000000000 00000001fffffffe
> ffff0000016b4000
> [  904.331240] page dumped because: bad pte
> [  904.331590] addr:0000aaaad9afe000 vm_flags:00000075
> anon_vma:0000000000000000 mapping:ffff0000300d4188 index:2e
> [  904.332476] file:fork13 fault:filemap_fault mmap:nfs_file_mmap
> read_folio:nfs_read_folio
> [  904.333245] CPU: 5 PID: 22685 Comm: fork13 Tainted: G    B


Are these maybe side-effects due to

https://lkml.kernel.org/r/20240607103241.1298388-1-wangkefeng.wang@huawei.com


How reproducible is this?

-- 
Cheers,

David / dhildenb