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List-Unsubscribe: On Tue, Feb 03, 2026 at 11:47:46AM +0800, Vernon Yang wrote: > On 2026-02-02, Harry Yoo wrote: > > On Mon, Feb 02, 2026 at 02:40:14PM +0800, 李龙兴 wrote: > > > Dear Linux kernel developers and maintainers, > > > > > > We would like to report a new kernel bug found by our tool. WARNING in > > > mempool_alloc_noprof. Details are as follows. > > > > > > Kernel commit: v6.12.11 > > > Kernel config: see attachment > > > report: see attachment > > > > > > We are currently analyzing the root cause and working on a > > > reproducible PoC. We will provide further updates in this thread as > > > soon as we have more information. > > > > > > Best regards, > > > Longxing Li > > > > > > ------------[ cut here ]------------ > > > WARNING: CPU: 1 PID: 362734 at mm/page_alloc.c:4234 > > > __alloc_pages_slowpath mm/page_alloc.c:4234 [inline] > > > WARNING: CPU: 1 PID: 362734 at mm/page_alloc.c:4234 > > > __alloc_pages_noprof+0x2025/0x25a0 mm/page_alloc.c:4766 > > > Modules linked in: > > > CPU: 1 UID: 0 PID: 362734 Comm: syz-executor.5 Not tainted 6.12.11 #1 > > > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 > > > RIP: 0010:__alloc_pages_slowpath mm/page_alloc.c:4234 [inline] > > > RIP: 0010:__alloc_pages_noprof+0x2025/0x25a0 mm/page_alloc.c:4766 > > > > page allocator triggers a warning when __GFP_NOFAIL is set but > > __GFP_DIRECT_RECLAIM is not set. > > > > > Code: 10 00 00 00 44 8b 74 24 48 41 89 c5 0f b6 c0 44 8b a4 24 84 00 > > > 00 00 89 44 24 28 e9 e5 f6 ff ff 90 0f 0b 90 e9 f1 f6 ff ff 90 <0f> 0b > > > 90 e9 1e fb ff ff e8 2e a4 38 09 e9 5e ed ff ff 4c 89 f7 e8 > > > RSP: 0000:ffffc9003ce9e7d0 EFLAGS: 00010246 > > > RAX: 0000000000008000 RBX: 0000000000000000 RCX: ffffc9003ce9e8fc > > > RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff88813fff99c8 > > > RBP: 0000000000000000 R08: 000000000000028d R09: 0000000000000000 > > > R10: ffff88807fffbc17 R11: 0000000000000000 R12: 000000000009a800 > > > R13: 000000000009a800 R14: 1ffff920079d3d0e R15: 0000000000000001 > > > FS: 00007f1784eff640(0000) GS:ffff888135e00000(0000) knlGS:0000000000000000 > > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > > CR2: 000055bb25a85a28 CR3: 0000000096938000 CR4: 0000000000752ef0 > > > PKRU: 55555554 > > > Call Trace: > > > > > > alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2269 > > > mempool_alloc_noprof+0x176/0x390 mm/mempool.c:402 > > > > the user of the mempool (f2fs_encrypt_one_page) passed __GFP_DIRECT_RECLAIM, > > but mempool temporarily cleared it, but not __GFP_NOFAIL: > > gfp_temp = gfp_mask & ~(__GFP_DIRECT_RECLAIM|__GFP_IO) > > > > Hmm perhaps mempool should clear __GFP_NOFAIL as well when clearing > > __GFP_DIRECT_RECLAIM? > > LGTM. I wrote a fix pacth, as below. > > --- > > From 9131e1b26b1ec55dd38ab08512ed6da0fa7a21f0 Mon Sep 17 00:00:00 2001 > From: Vernon Yang > Date: Tue, 3 Feb 2026 10:51:45 +0800 > Subject: [PATCH] mm: mempool: remove __GFP_NOFAIL gfp_mask when first > allocation > > page allocator triggers a warning when __GFP_NOFAIL is set but > __GFP_DIRECT_RECLAIM is not set. > > The user of the mempool (f2fs_encrypt_one_page) passed > __GFP_DIRECT_RECLAIM, but mempool temporarily cleared it when > first allocate memory. > > gfp_temp = gfp_mask & ~(__GFP_DIRECT_RECLAIM|__GFP_IO) > > Make mempool also clear __GFP_NOFAIL as well when clearing > __GFP_DIRECT_RECLAIM. > > Closes: https://lore.kernel.org/linux-mm/CAHPqNmwK9TY5THsXWkJuYCdt7x*mZHPq65AUOLZJeMp-FdAMvA@mail.gmail.com > Suggested-by: Harry Yoo > Signed-off-by: Vernon Yang > --- Maybe the changelog could be rephrased a bit, but overall LGTM, thanks! > mm/mempool.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/mm/mempool.c b/mm/mempool.c > index c290e5261b47..679ab4a2cc5f 100644 > --- a/mm/mempool.c > +++ b/mm/mempool.c > @@ -472,7 +472,7 @@ static unsigned int mempool_alloc_from_pool(struct mempool *pool, void **elems, > static inline gfp_t mempool_adjust_gfp(gfp_t *gfp_mask) > { > *gfp_mask |= __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN; > - return *gfp_mask & ~(__GFP_DIRECT_RECLAIM | __GFP_IO); > + return *gfp_mask & ~(__GFP_NOFAIL | __GFP_DIRECT_RECLAIM | __GFP_IO); > } > > /** > --