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Mon, 22 Dec 2025 04:18:23 -0800 (PST) Date: Mon, 22 Dec 2025 04:18:23 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6949370f.050a0220.1b4e0c.0038.GAE@google.com> Subject: [syzbot] [mm?] KMSAN: uninit-value in swap_writeout From: syzbot To: akpm@linux-foundation.org, baohua@kernel.org, bhe@redhat.com, chrisl@kernel.org, kasong@tencent.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, nphamcs@gmail.com, shikemeng@huaweicloud.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: i6mysyy1e5m6uc5mzkd5nzzqbnbpkxa7 X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 4D8D01C000A X-HE-Tag: 1766405904-363935 X-HE-Meta: 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 OXjyx88s 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 ko9PU/sM j0Dlwce9kT1+y9cwLY+jhyu6hlFo4se5xVyTyXrJHfSL5hzikYFaxym9JNMPbr4GldFUOhzChxoH9DsSuHcV7JV5AEPsqO8EWHqSm3kKraRpXhWww+UW/jm1//7A5fksCJim36B2xk9a+j5qOqs3kz2VdpSL3y5mfAHyGjtjrqFn6qGfcLEHKvpjBnoQ4hwnDS2jW4UkbZFazSNHjCsggqTFnegIp+0iksuPhtzsM9KPpNtc+y3UR95d57Zg4FYK/grZgMzoPBM3eCJI1sSYGe+hMR9m7ttBft00kXDxWi0e5BWdthUBqZqIVryBBvUVQhO335zGDZ2V0DwvU91T3CacAqRUIqbQNpdjOTxh96hUQVwfUNJfHNARwyFssAkG5xmorhDHXpJrJmApUL9BJDX9UupNPKNJ+SsRydcNw0c3RmGPYVhn2rRfbG7H3Ic7 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: ea1013c15392 Merge tag 'bpf-fixes' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11d2e31a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b3903bdf68407a14 dashboard link: https://syzkaller.appspot.com/bug?extid=178fff6149127421c2cc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/27172fba4316/disk-ea1013c1.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ac8c65aa1d08/vmlinux-ea1013c1.xz kernel image: https://storage.googleapis.com/syzbot-assets/42241f684d1d/bzImage-ea1013c1.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+178fff6149127421c2cc@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in is_folio_zero_filled mm/page_io.c:188 [inline] BUG: KMSAN: uninit-value in swap_writeout+0x468/0x1390 mm/page_io.c:263 is_folio_zero_filled mm/page_io.c:188 [inline] swap_writeout+0x468/0x1390 mm/page_io.c:263 shmem_writeout+0x1abb/0x1f60 mm/shmem.c:1662 writeout mm/vmscan.c:649 [inline] pageout mm/vmscan.c:698 [inline] shrink_folio_list+0x5920/0x7fc0 mm/vmscan.c:1418 evict_folios+0x999d/0xbf30 mm/vmscan.c:4711 try_to_shrink_lruvec+0x12b6/0x17e0 mm/vmscan.c:4874 lru_gen_shrink_lruvec mm/vmscan.c:5023 [inline] shrink_lruvec+0x46f/0x4f10 mm/vmscan.c:5784 shrink_node_memcgs mm/vmscan.c:6020 [inline] shrink_node+0xf1e/0x51e0 mm/vmscan.c:6061 shrink_zones mm/vmscan.c:6300 [inline] do_try_to_free_pages+0x849/0x26b0 mm/vmscan.c:6362 try_to_free_mem_cgroup_pages+0x3ae/0x950 mm/vmscan.c:6690 try_charge_memcg+0x80f/0x1c50 mm/memcontrol.c:2388 obj_cgroup_charge_pages+0x2ed/0x600 mm/memcontrol.c:2823 __memcg_kmem_charge_page+0x14a/0x4c0 mm/memcontrol.c:2867 __alloc_frozen_pages_noprof+0x3ba/0xab0 mm/page_alloc.c:5227 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2486 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline] alloc_pages_noprof+0x102/0x280 mm/mempolicy.c:2577 io_mem_alloc_compound io_uring/memmap.c:30 [inline] io_region_allocate_pages+0x164/0x900 io_uring/memmap.c:165 io_create_region+0x6d0/0x830 io_uring/memmap.c:220 io_allocate_scq_urings+0x1e3/0x8a0 io_uring/io_uring.c:3379 io_uring_create+0x7b5/0x1040 io_uring/io_uring.c:3643 io_uring_setup io_uring/io_uring.c:3718 [inline] __do_sys_io_uring_setup io_uring/io_uring.c:3752 [inline] __se_sys_io_uring_setup+0x3f0/0x410 io_uring/io_uring.c:3743 __ia32_sys_io_uring_setup+0x76/0xb0 io_uring/io_uring.c:3743 ia32_sys_call+0x2c57/0x4340 arch/x86/include/generated/asm/syscalls_32.h:426 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x15a/0x330 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:332 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:370 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Uninit was created at: __alloc_frozen_pages_noprof+0x421/0xab0 mm/page_alloc.c:5233 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2486 folio_alloc_mpol_noprof+0x56/0x1d0 mm/mempolicy.c:2505 shmem_alloc_folio mm/shmem.c:1890 [inline] shmem_alloc_and_add_folio+0xc56/0x1bd0 mm/shmem.c:1932 shmem_get_folio_gfp+0xad3/0x1fc0 mm/shmem.c:2556 shmem_get_folio mm/shmem.c:2662 [inline] shmem_symlink+0x562/0xad0 mm/shmem.c:4129 vfs_symlink+0x42f/0x4c0 fs/namei.c:5514 do_symlinkat+0x2ae/0xbb0 fs/namei.c:5541 __do_sys_symlinkat fs/namei.c:5562 [inline] __se_sys_symlinkat fs/namei.c:5559 [inline] __ia32_sys_symlinkat+0xf5/0x180 fs/namei.c:5559 ia32_sys_call+0x385e/0x4340 arch/x86/include/generated/asm/syscalls_32.h:305 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x15a/0x330 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:332 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:370 entry_SYSENTER_compat_after_hwframe+0x84/0x8e CPU: 0 UID: 0 PID: 7862 Comm: syz.2.517 Tainted: G L syzkaller #0 PREEMPT(none) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 ===================================================== --- 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