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Fri, 26 Jun 2026 14:29:12 -0700 (PDT) Message-ID: <6a3eef28.4ad61264.123291.6658@mx.google.com> Date: Fri, 26 Jun 2026 14:29:12 -0700 (PDT) Subject: WARNING in bdev_getblk To: akpm@linux-foundation.org, vbabka@suse.cz, surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: syzkaller@googlegroups.com, contact@pgazz.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: sanan.hasanou@gmail.com Good day, dear maintainers, We found a bug using a modified version of syzkaller. Kernel Branch: 7.0-rc1 Kernel Config: Reproducer: Thank you! Best regards, Sanan Hasanov ------------[ cut here ]------------ current->flags & PF_MEMALLOC WARNING: mm/page_alloc.c:4741 at __alloc_pages_slowpath+0xd1e/0xd50 mm/page_alloc.c:4741, CPU#0: kswapd1/87 Modules linked in: CPU: 0 UID: 0 PID: 87 Comm: kswapd1 Not tainted 7.0.0-rc1 #1 PREEMPT(full) Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__alloc_pages_slowpath+0xd1e/0xd50 mm/page_alloc.c:4741 Code: 8b 1c 25 08 00 ba 90 48 83 c3 2c 48 89 d8 48 c1 e8 03 0f b6 04 08 84 c0 75 23 f6 43 01 08 48 8b 54 24 08 0f 84 2d f3 ff ff 90 <0f> 0b 90 e9 24 f3 ff ff e8 55 26 fd 08 90 0f 0b 90 eb c1 89 d9 80 RSP: 0018:ffffc9000156e7f8 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ffff88804128802c RCX: dffffc0000000000 RDX: ffffc9000156e920 RSI: 0000000000000000 RDI: 0000000000148c48 RBP: 0000000000148c48 R08: ffff88803fffd9b0 R09: 00000000000095f5 R10: dffffc0000000000 R11: ffffed100fffb449 R12: ffffc9000156e920 R13: 1ffff920002add20 R14: 0000000000148c48 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88809b080000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007facf51fc504 CR3: 000000001b54e000 CR4: 00000000000006f0 Call Trace: __alloc_frozen_pages_noprof+0x314/0x370 mm/page_alloc.c:5263 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2484 alloc_frozen_pages_noprof mm/mempolicy.c:2555 [inline] alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2575 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2585 filemap_alloc_folio_noprof+0x107/0x470 mm/filemap.c:1013 __filemap_get_folio_mpol+0x3fc/0xb00 mm/filemap.c:2006 __filemap_get_folio include/linux/pagemap.h:774 [inline] grow_dev_folio fs/buffer.c:1047 [inline] grow_buffers fs/buffer.c:1113 [inline] __getblk_slow fs/buffer.c:1131 [inline] bdev_getblk+0x1f7/0x6e0 fs/buffer.c:1458 __getblk include/linux/buffer_head.h:380 [inline] sb_getblk include/linux/buffer_head.h:386 [inline] ext4_xattr_block_set+0x1d6b/0x2ab0 fs/ext4/xattr.c:2131 ext4_xattr_move_to_block fs/ext4/xattr.c:2669 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2744 [inline] ext4_expand_extra_isize_ea+0x12da/0x1ea0 fs/ext4/xattr.c:2832 __ext4_expand_extra_isize+0x308/0x400 fs/ext4/inode.c:6297 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6340 [inline] __ext4_mark_inode_dirty+0x45c/0x730 fs/ext4/inode.c:6418 ext4_dirty_inode+0xcb/0x110 fs/ext4/inode.c:6450 __mark_inode_dirty+0x39d/0x1470 fs/fs-writeback.c:2608 mark_inode_dirty_sync include/linux/fs.h:2217 [inline] sync_lazytime+0x13b/0x2d0 fs/fs-writeback.c:1722 iput+0x230/0xe80 fs/inode.c:1997 __dentry_kill+0x198/0x5d0 fs/dcache.c:670 shrink_kill+0xa9/0x2c0 fs/dcache.c:1147 shrink_dentry_list+0x2e0/0x5e0 fs/dcache.c:1174 prune_dcache_sb+0x10e/0x170 fs/dcache.c:1256 super_cache_scan+0x365/0x4a0 fs/super.c:223 do_shrink_slab+0x6d2/0x1160 mm/shrinker.c:437 shrink_slab_memcg mm/shrinker.c:550 [inline] shrink_slab+0x7ef/0x10d0 mm/shrinker.c:628 shrink_one+0x2d9/0x720 mm/vmscan.c:4928 shrink_many mm/vmscan.c:4989 [inline] lru_gen_shrink_node mm/vmscan.c:5067 [inline] shrink_node+0x3134/0x3a20 mm/vmscan.c:6047 kswapd_shrink_node mm/vmscan.c:6894 [inline] balance_pgdat mm/vmscan.c:7070 [inline] kswapd+0x1688/0x2d50 mm/vmscan.c:7343 kthread+0x389/0x480 kernel/kthread.c:467 ret_from_fork+0x507/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:245 <<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>> Modules linked in: CPU: 0 UID: 0 PID: 87 Comm: kswapd1 Not tainted 7.0.0-rc1 #1 PREEMPT(full) Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__alloc_pages_slowpath+0xd1e/0xd50 Code: 8b 1c 25 08 00 ba 90 48 83 c3 2c 48 89 d8 48 c1 e8 03 0f b6 04 08 84 c0 75 23 f6 43 01 08 48 8b 54 24 08 0f 84 2d f3 ff ff 90 <0f> 0b 90 e9 24 f3 ff ff e8 55 26 fd 08 90 0f 0b 90 eb c1 89 d9 80 RSP: 0018:ffffc9000156e7f8 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ffff88804128802c RCX: dffffc0000000000 RDX: ffffc9000156e920 RSI: 0000000000000000 RDI: 0000000000148c48 RBP: 0000000000148c48 R08: ffff88803fffd9b0 R09: 00000000000095f5 R10: dffffc0000000000 R11: ffffed100fffb449 R12: ffffc9000156e920 R13: 1ffff920002add20 R14: 0000000000148c48 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88809b080000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007facf51fc504 CR3: 000000001b54e000 CR4: 00000000000006f0 Call Trace: __alloc_frozen_pages_noprof+0x314/0x370 alloc_pages_mpol+0x232/0x4a0 alloc_pages_noprof+0xa9/0x190 folio_alloc_noprof+0x1e/0x30 filemap_alloc_folio_noprof+0x107/0x470 __filemap_get_folio_mpol+0x3fc/0xb00 bdev_getblk+0x1f7/0x6e0 ext4_xattr_block_set+0x1d6b/0x2ab0 ext4_expand_extra_isize_ea+0x12da/0x1ea0 __ext4_expand_extra_isize+0x308/0x400 __ext4_mark_inode_dirty+0x45c/0x730 ext4_dirty_inode+0xcb/0x110 __mark_inode_dirty+0x39d/0x1470 sync_lazytime+0x13b/0x2d0 iput+0x230/0xe80 __dentry_kill+0x198/0x5d0 shrink_kill+0xa9/0x2c0 shrink_dentry_list+0x2e0/0x5e0 prune_dcache_sb+0x10e/0x170 super_cache_scan+0x365/0x4a0 do_shrink_slab+0x6d2/0x1160 shrink_slab+0x7ef/0x10d0 shrink_one+0x2d9/0x720 shrink_node+0x3134/0x3a20 kswapd+0x1688/0x2d50 kthread+0x389/0x480 ret_from_fork+0x507/0xb90 ret_from_fork_asm+0x11/0x20 Kernel panic - not syncing: kernel: panic_on_warn set ... CPU: 0 UID: 0 PID: 87 Comm: kswapd1 Not tainted 7.0.0-rc1 #1 PREEMPT(full) Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: vpanic+0x41f/0xa20 panic+0xb9/0xc0 __warn+0x317/0x500 __report_bug+0x28d/0x500 report_bug+0x16a/0x220 handle_bug+0x98/0x200 exc_invalid_op+0x1a/0x50 asm_exc_invalid_op+0x1a/0x20 RIP: 0010:__alloc_pages_slowpath+0xd1e/0xd50 Code: 8b 1c 25 08 00 ba 90 48 83 c3 2c 48 89 d8 48 c1 e8 03 0f b6 04 08 84 c0 75 23 f6 43 01 08 48 8b 54 24 08 0f 84 2d f3 ff ff 90 <0f> 0b 90 e9 24 f3 ff ff e8 55 26 fd 08 90 0f 0b 90 eb c1 89 d9 80 RSP: 0018:ffffc9000156e7f8 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ffff88804128802c RCX: dffffc0000000000 RDX: ffffc9000156e920 RSI: 0000000000000000 RDI: 0000000000148c48 RBP: 0000000000148c48 R08: ffff88803fffd9b0 R09: 00000000000095f5 R10: dffffc0000000000 R11: ffffed100fffb449 R12: ffffc9000156e920 R13: 1ffff920002add20 R14: 0000000000148c48 R15: 0000000000000000 __alloc_frozen_pages_noprof+0x314/0x370 alloc_pages_mpol+0x232/0x4a0 alloc_pages_noprof+0xa9/0x190 folio_alloc_noprof+0x1e/0x30 filemap_alloc_folio_noprof+0x107/0x470 __filemap_get_folio_mpol+0x3fc/0xb00 bdev_getblk+0x1f7/0x6e0 ext4_xattr_block_set+0x1d6b/0x2ab0 ext4_expand_extra_isize_ea+0x12da/0x1ea0 __ext4_expand_extra_isize+0x308/0x400 __ext4_mark_inode_dirty+0x45c/0x730 ext4_dirty_inode+0xcb/0x110 __mark_inode_dirty+0x39d/0x1470 sync_lazytime+0x13b/0x2d0 iput+0x230/0xe80 __dentry_kill+0x198/0x5d0 shrink_kill+0xa9/0x2c0 shrink_dentry_list+0x2e0/0x5e0 prune_dcache_sb+0x10e/0x170 super_cache_scan+0x365/0x4a0 do_shrink_slab+0x6d2/0x1160 shrink_slab+0x7ef/0x10d0 shrink_one+0x2d9/0x720 shrink_node+0x3134/0x3a20 kswapd+0x1688/0x2d50 kthread+0x389/0x480 ret_from_fork+0x507/0xb90 ret_from_fork_asm+0x11/0x20 Kernel Offset: disabled Rebooting in 86400 seconds.. <<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>