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Sun, 30 Nov 2025 07:51:03 -0800 (PST) Date: Sun, 30 Nov 2025 07:51:03 -0800 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <692c67e7.a70a0220.d98e3.0172.GAE@google.com> Subject: Re: [syzbot] [fs?] [mm?] kernel BUG in __filemap_add_folio From: syzbot To: akpm@linux-foundation.org, brauner@kernel.org, hare@suse.de, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mcgrof@kernel.org, ssranevjti@gmail.com, syzkaller-bugs@googlegroups.com, willy@infradead.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 2A04D1C000A X-Rspamd-Server: rspam02 X-Stat-Signature: bphz5zxngyryp7n6ynepqyjjwu43pky8 X-Rspam-User: X-HE-Tag: 1764517863-802189 X-HE-Meta: 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 bB+hCX6P 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 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: List-Subscribe: List-Unsubscribe: Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: kernel BUG in mpage_readahead ------------[ cut here ]------------ kernel BUG at ./include/linux/pagemap.h:1408! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 1 UID: 0 PID: 18176 Comm: syz-executor317 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__readahead_folio include/linux/pagemap.h:1408 [inline] RIP: 0010:readahead_folio include/linux/pagemap.h:1434 [inline] RIP: 0010:mpage_readahead+0x4ad/0x5a0 fs/mpage.c:367 Code: 5e 41 5f c3 cc cc cc cc e8 b0 19 70 ff 48 89 ef e8 48 06 ad ff e9 54 fe ff ff 4c 8b 6c 24 18 e9 43 ff ff ff e8 94 19 70 ff 90 <0f> 0b e8 8c 19 70 ff 48 c7 c6 00 b6 80 8b 48 89 ef e8 1d 39 ba ff RSP: 0018:ffffc9000d92f620 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffc9000d92fae8 RCX: ffffffff824c7d14 RDX: ffff88802fe68000 RSI: ffffffff824c809c RDI: 0000000000000004 RBP: 0000000000000004 R08: 0000000000000004 R09: 0000000000000004 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: fffff52001b25f61 R14: 0000000000000001 R15: 1ffff92001b25f61 FS: 0000555564bcd380(0000) GS:ffff888124f53000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f08297b0130 CR3: 0000000030a16000 CR4: 00000000003526f0 Call Trace: read_pages+0x1c4/0xc70 mm/readahead.c:163 page_cache_ra_unbounded+0x66a/0xa10 mm/readahead.c:269 do_page_cache_ra mm/readahead.c:332 [inline] page_cache_ra_order+0xc0b/0xf20 mm/readahead.c:542 do_sync_mmap_readahead mm/filemap.c:3340 [inline] filemap_fault+0x1583/0x29a0 mm/filemap.c:3489 __do_fault+0x10d/0x490 mm/memory.c:5281 do_shared_fault mm/memory.c:5780 [inline] do_fault mm/memory.c:5854 [inline] do_pte_missing+0x1a6/0x3ba0 mm/memory.c:4362 handle_pte_fault mm/memory.c:6195 [inline] __handle_mm_fault+0x1556/0x2aa0 mm/memory.c:6336 handle_mm_fault+0x589/0xd10 mm/memory.c:6505 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x64/0xc0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7f082970586d Code: 03 00 b9 03 10 12 00 45 31 c0 48 ba 80 00 00 00 00 20 00 00 48 b8 2f 64 65 76 2f 6e 75 6c 48 c7 c6 9c ff ff ff bf 01 01 00 00 <48> 89 02 48 b8 88 00 00 00 00 20 00 00 c7 00 6c 62 30 00 31 c0 e8 RSP: 002b:00007ffff735c180 EFLAGS: 00010246 RAX: 6c756e2f7665642f RBX: 0000000000000000 RCX: 0000000000121003 RDX: 0000200000000080 RSI: ffffffffffffff9c RDI: 0000000000000101 RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000002000 R10: 0000000000000013 R11: 0000000000000206 R12: 0000000000079470 R13: 00007ffff735c19c R14: 00007ffff735c1b0 R15: 00007ffff735c1a0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__readahead_folio include/linux/pagemap.h:1408 [inline] RIP: 0010:readahead_folio include/linux/pagemap.h:1434 [inline] RIP: 0010:mpage_readahead+0x4ad/0x5a0 fs/mpage.c:367 Code: 5e 41 5f c3 cc cc cc cc e8 b0 19 70 ff 48 89 ef e8 48 06 ad ff e9 54 fe ff ff 4c 8b 6c 24 18 e9 43 ff ff ff e8 94 19 70 ff 90 <0f> 0b e8 8c 19 70 ff 48 c7 c6 00 b6 80 8b 48 89 ef e8 1d 39 ba ff RSP: 0018:ffffc9000d92f620 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffc9000d92fae8 RCX: ffffffff824c7d14 RDX: ffff88802fe68000 RSI: ffffffff824c809c RDI: 0000000000000004 RBP: 0000000000000004 R08: 0000000000000004 R09: 0000000000000004 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: fffff52001b25f61 R14: 0000000000000001 R15: 1ffff92001b25f61 FS: 0000555564bcd380(0000) GS:ffff888124f53000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f08297b0130 CR3: 0000000030a16000 CR4: 00000000003526f0 Tested on: commit: 6bda50f4 Merge tag 'mips-fixes_6.18_2' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11857514580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f4a1ecf59be91960 dashboard link: https://syzkaller.appspot.com/bug?extid=4d3cc33ef7a77041efa6 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=10dc7cb4580000