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Thu, 10 Oct 2024 01:44:27 -0700 (PDT) Date: Thu, 10 Oct 2024 01:44:27 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <670793eb.050a0220.8109b.0003.GAE@google.com> Subject: [syzbot] [mm?] KMSAN: uninit-value in swap_writepage From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: 8C5E3140016 X-Stat-Signature: nyejysdaguiy1bjiyzytdbpbpaz6mrdu X-HE-Tag: 1728549867-276528 X-HE-Meta: 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 wN25Kdf/ 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 0/jF8xGh MFtbk8g4XO/ICdunqauRhCBMRxR7VpGZwAg0epFARhMhoGA7O7eOwLKhnyzZ+a3vwQCSBJJHYVv5NT8yTmxuzWxNdiEkb8TWvVgS1UeYd4nEymNj0gU01/bzSHhGyNp/mM0k33Xs+Mq/QL13JuzocJ4LXOHAF2uFkPFWFHFZ6kvo3FttgC/0C+97q5mSWw8PuATmF+ERxN6KvxMoWgHCZ+WpApXFJVh3XGV6zSNsTdXdUu2c5ei3OcZjVTKa2x5u3iU7RUoy5shDTH2xXQapmUooKHehfPzCs+gVn/za6nxd0DmdP5e6Tls0m1l4N+tPh6n33wOrSp6yt5eycPQVVmlpNaR/26aOirL5HiYefmKSrC4GPx2sDRKC5g+3JfJffbg+VXO79MGjUS5mwPlCnK8S1KlW4LvR 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 found the following issue on: HEAD commit: fc20a3e57247 Merge tag 'for-linus-6.12a-rc2-tag' of git://.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11cdfd27980000 kernel config: https://syzkaller.appspot.com/x/.config?x=d302f14701986aa0 dashboard link: https://syzkaller.appspot.com/bug?extid=febb2473441bfb8fb380 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5b4b9aca7b75/disk-fc20a3e5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b22e17636ec0/vmlinux-fc20a3e5.xz kernel image: https://storage.googleapis.com/syzbot-assets/5266e625be99/bzImage-fc20a3e5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+febb2473441bfb8fb380@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in is_folio_zero_filled mm/page_io.c:189 [inline] BUG: KMSAN: uninit-value in swap_writepage+0x536/0x12b0 mm/page_io.c:259 is_folio_zero_filled mm/page_io.c:189 [inline] swap_writepage+0x536/0x12b0 mm/page_io.c:259 shmem_writepage+0x2117/0x2450 mm/shmem.c:1567 pageout mm/vmscan.c:688 [inline] shrink_folio_list+0x5e78/0x7dd0 mm/vmscan.c:1366 evict_folios+0x9813/0xbaf0 mm/vmscan.c:4583 try_to_shrink_lruvec+0x13a3/0x1750 mm/vmscan.c:4778 shrink_one+0x646/0xd20 mm/vmscan.c:4816 shrink_many mm/vmscan.c:4879 [inline] lru_gen_shrink_node mm/vmscan.c:4957 [inline] shrink_node+0x451a/0x50f0 mm/vmscan.c:5937 kswapd_shrink_node mm/vmscan.c:6765 [inline] balance_pgdat mm/vmscan.c:6957 [inline] kswapd+0x25e2/0x42f0 mm/vmscan.c:7226 kthread+0x3e2/0x540 kernel/kthread.c:389 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit was created at: __alloc_pages_noprof+0x9d6/0xe70 mm/page_alloc.c:4756 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2265 folio_alloc_mpol_noprof+0x55/0x180 mm/mempolicy.c:2283 shmem_alloc_folio mm/shmem.c:1774 [inline] shmem_alloc_and_add_folio+0xc33/0x1c30 mm/shmem.c:1813 shmem_get_folio_gfp+0xacd/0x1f30 mm/shmem.c:2335 shmem_get_folio mm/shmem.c:2441 [inline] shmem_symlink+0x528/0xa20 mm/shmem.c:3834 vfs_symlink+0x1ed/0x460 fs/namei.c:4615 do_symlinkat+0x257/0x8a0 fs/namei.c:4641 __do_sys_symlink fs/namei.c:4662 [inline] __se_sys_symlink fs/namei.c:4660 [inline] __x64_sys_symlink+0xe0/0x140 fs/namei.c:4660 x64_sys_call+0x30e8/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:89 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 UID: 0 PID: 80 Comm: kswapd0 Tainted: G W 6.12.0-rc1-syzkaller-00330-gfc20a3e57247 #0 Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup