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bh=GwT8BN3Su3b4LZ3jmGV70VHG+6MaOJryuf1ZHxELFyQ=; b=oLDF4DSExaCBgAq5EQURA3Te8M/Myh4RpdCK6yS92UavD3r6PE8uA6bSe+nW2zYwslpSZO hkNT12hthpgWDO+ZsikpiCHqh5YeZRbFWbwh1DXt1Oq7nMY9uIgTLtnedcCKfds99EJxxY UizntJzcfhWgw7KJPQI5lYs1BOQNCAY= Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2022-7-12 header.b=y0AV7z2A; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=jvZapOHZ; dmarc=pass (policy=none) header.from=oracle.com; arc=pass ("microsoft.com:s=arcselector9901:i=1"); spf=pass (imf22.hostedemail.com: domain of mike.kravetz@oracle.com designates 205.220.177.32 as permitted sender) smtp.mailfrom=mike.kravetz@oracle.com X-Rspam-User: X-Stat-Signature: 4ewbjgdwsxjpuyi5iy5j8fmqepam9dth X-Rspamd-Queue-Id: CF4FBC0010 X-Rspamd-Server: rspam11 X-HE-Tag: 1668799655-187740 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 11/18/22 14:21, Aneesh Kumar K.V wrote: > "Aneesh Kumar K.V" writes: > > > Hi Mike, > > > > With latest upstream I am finding the below: > > > > [ 0.246646] page dumped because: VM_BUG_ON_PAGE(1 && PageCompound(page)) > > [ 0.246671] ------------[ cut here ]------------ > > [ 0.246679] kernel BUG at include/linux/page-flags.h:500! > > cpu 0x6: Vector: 700 (Program Check) at [c00000000fe5b700] > > pc: c0000000005e9984: __prep_compound_gigantic_page+0xd4/0x3e0 > > lr: c0000000005e9980: __prep_compound_gigantic_page+0xd0/0x3e0 > > sp: c00000000fe5b9a0 > > msr: 8000000000029033 > > current = 0xc00000000fdf9880 > > paca = 0xc00000001ec7f480 irqmask: 0x03 irq_happened: 0x01 > > pid = 1, comm = swapper/0 > > kernel BUG at e)):500! > > Linux version 6.1.0-rc5-00518-ge0951d75adc4 (kvaneesh@ltczz75-lp2) (gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0, GNU ld (GNU Binutils for Ubuntu) 2.34) #395 SMP Fri Nov 18 00:44:21 CST 2022 > > enter ? for help > > [c00000000fe5ba60] c000000001bddd74 hugetlb_init+0x60c/0xa10 > > [c00000000fe5bb60] c0000000000121c0 do_one_initcall+0xa0/0x550 > > [c00000000fe5bc40] c000000001b94b90 do_basic_setup+0x1f4/0x254 > > [c00000000fe5bd20] c000000001b94f38 kernel_init_freeable+0x2ac/0x32c > > [c00000000fe5bda0] c000000000012cf0 kernel_init+0x44/0x184 > > [c00000000fe5be10] c00000000000cdec ret_from_kernel_thread+0x5c/0x64 > > 6:mon> > > > > > > IIUC that is because we are doing __SetPageHead() before doing > > __ClearPageReserved(). The original commit that added compound head > > check in set/clear page reserved did have the change to take care of > > this. > > > > Adding the correct commit details > commit de09d31dd38a ("page-flags: define PG_reserved behavior on compound pages") Thanks Aneesh! This was caused by shuffling of code in my commit 2b21624fc2327 ("hugetlb: freeze allocated pages before creating hugetlb pages"). My bad for not running with CONFIG_DEBUG_VM_PGFLAGS. Will send a fix shortly. -- Mike Kravetz