Re: next: WARNING: CPU: 0 PID: 1200 at mm/page_alloc.c:4744 __alloc_pages+0x2e8/0x3a0

[Chuck Lever III]

> On May 12, 2023, at 6:32 AM, Dan Carpenter <dan.carpenter@xxxxxxxxxx> wrote:
> 
> I'm pretty sure Chuck Lever did this intentionally, but he's not on the
> CC list.  Let's add him.
> 
> regards,
> dan carpenter
> 
> On Fri, May 12, 2023 at 06:15:04PM +0530, Naresh Kamboju wrote:
>> Following kernel warning has been noticed on qemu-arm64 while running kunit
>> tests while booting Linux 6.4.0-rc1-next-20230512 and It was started from
>> 6.3.0-rc7-next-20230420.
>> 
>> Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>
>> 
>> This is always reproducible on qemu-arm64, qemu-arm, qemu-x86 and qemu-i386.
>> Is this expected warning as a part of kunit tests ?

Dan's correct, this Kunit test is supposed to check the
behavior of the API when a too-large privsize is specified.

I'm not sure how to make this work without the superfluous
warning. Would adding GFP_NOWARN to the allocation help?


>> Crash log:
>> -----------
>> 
>> [  663.530868]     KTAP version 1
>> [  663.531545]     # Subtest: Handshake API tests
>> [  663.533521]     1..11
>> [  663.534424]         KTAP version 1
>> [  663.535406]         # Subtest: req_alloc API fuzzing
>> [  663.542460]         ok 1 handshake_req_alloc NULL proto
>> [  663.550345]         ok 2 handshake_req_alloc CLASS_NONE
>> [  663.558041]         ok 3 handshake_req_alloc CLASS_MAX
>> [  663.565790]         ok 4 handshake_req_alloc no callbacks
>> [  663.573882]         ok 5 handshake_req_alloc no done callback
>> [  663.580284] ------------[ cut here ]------------
>> [  663.582129] WARNING: CPU: 0 PID: 1200 at mm/page_alloc.c:4744
>> __alloc_pages+0x2e8/0x3a0
>> [  663.585675] Modules linked in:
>> [  663.587808] CPU: 0 PID: 1200 Comm: kunit_try_catch Tainted: G
>>          N 6.4.0-rc1-next-20230512 #1
>> [  663.589817] Hardware name: linux,dummy-virt (DT)
>> [  663.591426] pstate: 22400005 (nzCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
>> [  663.592978] pc : __alloc_pages+0x2e8/0x3a0
>> [  663.594236] lr : __kmalloc_large_node+0xbc/0x160
>> [  663.595548] sp : ffff80000a317bc0
>> [  663.596577] x29: ffff80000a317bc0 x28: 0000000000000000 x27: 0000000000000000
>> [  663.598863] x26: ffff0000c8925b20 x25: 0000000000000000 x24: 0000000000000015
>> [  663.601098] x23: 0000000000040dc0 x22: ffffbf424e7420c8 x21: ffffbf424e7420c8
>> [  663.603100] x20: 1ffff00001462f88 x19: 0000000000040dc0 x18: 0000000078b4155a
>> [  663.605582] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
>> [  663.607328] x14: 0000000000000000 x13: 6461657268745f68 x12: ffff60001913bc5a
>> [  663.609355] x11: 1fffe0001913bc59 x10: ffff60001913bc59 x9 : 1fffe0001913bc59
>> [  663.611004] x8 : 0000000041b58ab3 x7 : ffff700001462f88 x6 : dfff800000000000
>> [  663.613556] x5 : 00000000f1f1f1f1 x4 : 00000000f2f2f200 x3 : 0000000000000000
>> [  663.615364] x2 : 0000000000000000 x1 : 0000000000000001 x0 : ffffbf42516818e2
>> [  663.617753] Call trace:
>> [  663.618486]  __alloc_pages+0x2e8/0x3a0
>> [  663.619613]  __kmalloc_large_node+0xbc/0x160
>> [  663.621454]  __kmalloc+0x84/0x94
>> [  663.622551]  handshake_req_alloc+0x74/0xe8
>> [  663.623801]  handshake_req_alloc_case+0xa0/0x170
>> [  663.625467]  kunit_try_run_case+0x7c/0x100
>> [  663.626592]  kunit_generic_run_threadfn_adapter+0x30/0x4c
>> [  663.628998]  kthread+0x1d4/0x1e4
>> [  663.629715]  ret_from_fork+0x10/0x20
>> [  663.631094] ---[ end trace 0000000000000000 ]---
>> [  663.643101]         ok 6 handshake_req_alloc excessive privsize
>> [  663.649446]         ok 7 handshake_req_alloc all good
>> [  663.651032]     # req_alloc API fuzzing: pass:7 fail:0 skip:0 total:7
>> [  663.653941]     ok 1 req_alloc API fuzzing
>> [  663.665951]     ok 2 req_submit NULL req arg
>> [  663.674278]     ok 3 req_submit NULL sock arg
>> [  663.682968]     ok 4 req_submit NULL sock->file
>> [  663.694323]     ok 5 req_lookup works
>> [  663.703604]     ok 6 req_submit max pending
>> [  663.714655]     ok 7 req_submit multiple
>> [  663.725174]     ok 8 req_cancel before accept
>> [  663.733780]     ok 9 req_cancel after accept
>> [  663.742528]     ok 10 req_cancel after done
>> [  663.750637]     ok 11 req_destroy works
>> [  663.751884] # Handshake API tests: pass:11 fail:0 skip:0 total:11
>> [  663.753579] # Totals: pass:17 fail:0 skip:0 total:17
>> 
>> links:
>> ------
>> 
>> - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230512/testrun/16901289/suite/log-parser-boot/test/check-kernel-exception/log
>> - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230512/testrun/16901289/suite/log-parser-boot/tests/
>> - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230420/testrun/16385677/suite/log-parser-boot/test/check-kernel-warning-ac79d2ca0f443d407d9749244f1738c9a2b123c609820f82d9e8907c756f5340/log
>> - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230512/testrun/16901289/suite/log-parser-boot/test/check-kernel-warning-ac79d2ca0f443d407d9749244f1738c9a2b123c609820f82d9e8907c756f5340/history/
>> 
>> 
>> --
>> Linaro LKFT
>> https://lkft.linaro.org

--
Chuck Lever