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X-Forwarded-Encrypted: i=1; AHgh+RoqkqvxEhJqcWmxSpT83b3Efv4vRGMfdZUkZzkkXxuzN4bYDYudWzpXDRBrINls2LDA+V3IbQy9yw==@kvack.org X-Gm-Message-State: AOJu0YwUlrWXKbrjhTNLjj8rfTf1ZxPPrYy88OEKRqMIZdlJzWNUgUs5 LzOeJsNaNlg4LNN1VBt4LrrvLQo6ldkHi+/UVJlKg9Ar0O3ny184NkvJstCUTsKuIa6rhHDavzG f4WyWMRDgMn/I1Q0CvvK+t5lSXrZ2SF2etTMouU+fxLGVsOCuTD1LCDt4jLo= MIME-Version: 1.0 X-Received: by 2002:a05:6808:118d:b0:496:10e6:f76e with SMTP id 5614622812f47-4ab6a04a45fmr1158979b6e.4.1784955840293; Fri, 24 Jul 2026 22:04:00 -0700 (PDT) Date: Fri, 24 Jul 2026 22:04:00 -0700 In-Reply-To: <20260723143034.175661-1-willy@infradead.org> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a6443c0.70955b6c.323240.0013.GAE@google.com> Subject: [syzbot ci] Re: Use generic_file_read_iter() in hugetlbfs From: syzbot ci To: akpm@linux-foundation.org, christian@brauner.io, david@kernel.org, jack@suse.cz, jane.chu@oracle.com, jiaqiyan@google.com, linmiaohe@huawei.com, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, muchun.song@linux.dev, nao.horiguchi@gmail.com, naoya.horiguchi@nec.com, osalvador@suse.de, stable@vger.kernel.org, usama.arif@linux.dev, willy@infradead.org Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 25410100009 X-Rspam-User: X-Stat-Signature: b5bgj8y4pstqdgsde8ci88wbk98ikg4n X-HE-Tag: 1784955841-158139 X-HE-Meta: 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 /xMNCA14 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 rXJVfETF vOGFhKZn/xggG1GE3N4Srd6bywXO5iQM5ck99ceblyyZ9hlBpgmygBfl1jWhIIFvxdSQbi2ecRQa1wlcgsiTfw0EfjqUrsCD Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: syzbot ci has tested the following series [v4] Use generic_file_read_iter() in hugetlbfs https://lore.kernel.org/all/20260723143034.175661-1-willy@infradead.org * [PATCH v4 01/14] memory-failure: Fix hardware poison check in unpoison_memory() again * [PATCH v4 02/14] memory-failure: Test the page is hwpoison before taking the mutex * [PATCH v4 03/14] mm: Rename folio_contain_hwpoison_page() to folio_has_hwpoison_page() * [PATCH v4 04/14] hugetlb: Mark some function arguments as const * [PATCH v4 05/14] guest_memfd: Use folio_has_hwpoisoned_page() * [PATCH v4 06/14] memory-failure: Remove raw_hwp_list_head() * [PATCH v4 07/14] hugetlb: Use the has_hwpoisoned flag * [PATCH v4 08/14] mm: Remove locking mf_mutex in is_raw_hwpoison_page_in_hugepage() * [PATCH v4 09/14] mm: Check individual hugetlb pages for poison * [PATCH v4 10/14] filemap: Add hwpoison handling to filemap_read() * [PATCH v4 11/14] filemap: Remove checks in mapping_set_folio_order_range() * [PATCH v4 12/14] hugetlb: Set mapping folio order * [PATCH v4 13/14] filemap: Add support for authoritative mappings * [PATCH v4 14/14] hugetlb: replace hugetlbfs_read_iter() with generic_file_read_iter() and found the following issues: * WARNING in bio_add_page * general protection fault in create_empty_buffers Full report is available here: https://ci.syzbot.org/series/4b3a4f52-06f4-4a41-872f-dde0771be8ef *** WARNING in bio_add_page tree: mm-new URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git base: 1590cf0329716306e948a8fc29f1d3ee87d3989f arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/bb071828-9749-428c-a78c-fc39b0b5caf2/config syz repro: https://ci.syzbot.org/findings/38d53450-b153-4f47-8474-be250791ea91/syz_repro ------------[ cut here ]------------ len == 0 WARNING: block/bio.c:1052 at bio_add_page+0x516/0x700 block/bio.c:1052, CPU#0: udevd/5630 Modules linked in: CPU: 0 UID: 0 PID: 5630 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:bio_add_page+0x516/0x700 block/bio.c:1052 Code: 31 ed 44 89 e8 48 83 c4 50 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 86 5e 17 fd 90 0f 0b 90 eb db e8 7b 5e 17 fd 90 <0f> 0b 90 eb d0 e8 70 5e 17 fd 90 0f 0b 90 e9 76 fe ff ff e8 62 5e RSP: 0018:ffffc9000487f0f8 EFLAGS: 00010293 RAX: ffffffff84af2445 RBX: 0000000000000000 RCX: ffff8881108d0000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 1ffff110228761e2 R08: ffff8881143b0f7f R09: 1ffff110228761ef R10: dffffc0000000000 R11: ffffed10228761f0 R12: ffff8881143b0f14 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007faeac7ccc80(0000) GS:ffff88818d945000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000295e815ae000 CR3: 0000000114e0e000 CR4: 00000000000006f0 Call Trace: bio_add_folio+0x64/0x90 block/bio.c:1107 do_mpage_readpage+0xd8c/0x1b40 fs/mpage.c:294 mpage_readahead+0x3e7/0x800 fs/mpage.c:370 read_pages+0x193/0x5a0 mm/readahead.c:174 page_cache_ra_unbounded+0x679/0x8f0 mm/readahead.c:315 do_page_cache_ra mm/readahead.c:348 [inline] force_page_cache_ra+0x26c/0x2e0 mm/readahead.c:378 filemap_get_pages+0x4d9/0x1ef0 mm/filemap.c:2708 filemap_read+0x422/0x1630 mm/filemap.c:2841 blkdev_read_iter+0x2f1/0x420 block/fops.c:830 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x595/0xa80 fs/read_write.c:574 ksys_read+0x150/0x270 fs/read_write.c:716 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7faeac316b6a Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83 RSP: 002b:00007ffd8d811da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007faeac316b6a RDX: 0000000000000400 RSI: 0000557e6b670e18 RDI: 0000000000000009 RBP: 0000000000000400 R08: 0000557e6b670df0 R09: 0000000000000008 R10: 0000000000000051 R11: 0000000000000246 R12: 0000557e6b670df0 R13: 0000557e6b670e08 R14: 0000557e6b66e128 R15: 0000557e6b66e0d0 *** general protection fault in create_empty_buffers tree: mm-new URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git base: 1590cf0329716306e948a8fc29f1d3ee87d3989f arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/bb071828-9749-428c-a78c-fc39b0b5caf2/config syz repro: https://ci.syzbot.org/findings/2406d176-ea76-40a8-b6bc-41d3e6326388/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 5932 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:create_empty_buffers+0x48/0x520 fs/buffer.c:1672 Code: 00 00 00 00 fc ff df e8 96 dc 69 ff 48 89 df 4c 89 e6 ba 40 8c 40 00 e8 e6 bc ff ff 49 89 c4 48 89 04 24 4c 89 e0 48 c1 e8 03 <42> 80 3c 30 00 74 08 4c 89 e7 e8 09 bc d7 ff 4d 09 3c 24 49 83 c4 RSP: 0018:ffffc900034bf570 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffea0005ceb100 RCX: 0000000000000046 RDX: 0000000000000002 RSI: ffffffff8e4b7f70 RDI: ffff888172cdbb80 RBP: ffffc900034bf6f0 R08: ffffffff825c6656 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8eb5a120 R12: 0000000000000000 R13: 1ffffd4000b9d620 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007fd3c0fc7c80(0000) GS:ffff8882a8f45000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005567a5ebae48 CR3: 000000017395c000 CR4: 00000000000006f0 Call Trace: block_read_full_folio+0x116/0x810 fs/buffer.c:2381 filemap_read_folio+0x12c/0x3a0 mm/filemap.c:2512 filemap_update_page mm/filemap.c:2599 [inline] filemap_get_pages+0x1742/0x1ef0 mm/filemap.c:2731 filemap_read+0x422/0x1630 mm/filemap.c:2841 blkdev_read_iter+0x2f1/0x420 block/fops.c:830 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x595/0xa80 fs/read_write.c:574 ksys_read+0x150/0x270 fs/read_write.c:716 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd3c0b16b6a Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83 RSP: 002b:00007ffcab174708 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd3c0b16b6a RDX: 0000000000000400 RSI: 000055c883b6c638 RDI: 0000000000000009 RBP: 0000000000000400 R08: 000055c883b6c610 R09: 0000000000000008 R10: 0000000000000051 R11: 0000000000000246 R12: 000055c883b6c610 R13: 000055c883b6c628 R14: 000055c883b60b48 R15: 000055c883b60af0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:create_empty_buffers+0x48/0x520 fs/buffer.c:1672 Code: 00 00 00 00 fc ff df e8 96 dc 69 ff 48 89 df 4c 89 e6 ba 40 8c 40 00 e8 e6 bc ff ff 49 89 c4 48 89 04 24 4c 89 e0 48 c1 e8 03 <42> 80 3c 30 00 74 08 4c 89 e7 e8 09 bc d7 ff 4d 09 3c 24 49 83 c4 RSP: 0018:ffffc900034bf570 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffea0005ceb100 RCX: 0000000000000046 RDX: 0000000000000002 RSI: ffffffff8e4b7f70 RDI: ffff888172cdbb80 RBP: ffffc900034bf6f0 R08: ffffffff825c6656 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8eb5a120 R12: 0000000000000000 R13: 1ffffd4000b9d620 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007fd3c0fc7c80(0000) GS:ffff8882a8f45000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30763fff CR3: 000000017395c000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess), 6 bytes skipped: 0: df e8 fucomip %st(0),%st 2: 96 xchg %eax,%esi 3: dc 69 ff fsubrl -0x1(%rcx) 6: 48 89 df mov %rbx,%rdi 9: 4c 89 e6 mov %r12,%rsi c: ba 40 8c 40 00 mov $0x408c40,%edx 11: e8 e6 bc ff ff call 0xffffbcfc 16: 49 89 c4 mov %rax,%r12 19: 48 89 04 24 mov %rax,(%rsp) 1d: 4c 89 e0 mov %r12,%rax 20: 48 c1 e8 03 shr $0x3,%rax * 24: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 29: 74 08 je 0x33 2b: 4c 89 e7 mov %r12,%rdi 2e: e8 09 bc d7 ff call 0xffd7bc3c 33: 4d 09 3c 24 or %r15,(%r12) 37: 49 rex.WB 38: 83 .byte 0x83 39: c4 .byte 0xc4 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a patch for this bug, please reply with `#syz test` (should be on a separate line). The patch should be attached to the email. Note: arguments like custom git repos and branches are not supported.