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X-Gm-Message-State: AOJu0YzynHKRiCwfLsnd0E2ag7lcYtJsVakuNw9u8wOsSMQvMKu2YAYT DGRGR+bTydggYvI8YmXOtWlZBUWgzazK3tb0bQLNcsiWPRB6O3TENczbp8U2Pfim2AKYh9qJmMX sG5nsq867s8DyQu8dxdOHIM3kNOyugeOR3iuqtBjdPSC2S1F/OE/tTk0= X-Google-Smtp-Source: AGHT+IFcF/cldw+QIoy7SuV67XgA86mgrRXel//l1ed8VXiRsBm9rSTA6F+OUCB5jfHrY08qa6kLQ3HmaHYVJtuWU93jMqLiCUnm MIME-Version: 1.0 X-Received: by 2002:a05:6e02:370e:b0:3d0:101e:45e7 with SMTP id e9e14a558f8ab-3d0101e47acmr121088825ab.19.1738518856816; Sun, 02 Feb 2025 09:54:16 -0800 (PST) Date: Sun, 02 Feb 2025 09:54:16 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <679fb148.050a0220.d7c5a.0074.GAE@google.com> Subject: [syzbot] [mm?] [bcachefs?] UBSAN: shift-out-of-bounds in filemap_get_entry From: syzbot To: akpm@linux-foundation.org, hughd@google.com, kent.overstreet@linux.dev, linux-bcachefs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: 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https://syzkaller.appspot.com/bug?extid=a0ae55e3dde11d2d790c compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13877b64580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16063ddf980000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-69e858e0.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a53b888c1f3f/vmlinux-69e858e0.xz kernel image: https://storage.googleapis.com/syzbot-assets/6b5e17edafc0/bzImage-69e858e0.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/680b2fde83a8/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a0ae55e3dde11d2d790c@syzkaller.appspotmail.com ------------[ cut here ]------------ UBSAN: shift-out-of-bounds in lib/xarray.c:147:16 shift exponent 192 is too large for 64-bit type 'unsigned long' CPU: 0 UID: 0 PID: 2666 Comm: kworker/u4:9 Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: loop0 loop_rootcg_workfn Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468 get_offset lib/xarray.c:147 [inline] xas_descend lib/xarray.c:207 [inline] xas_load+0x583/0x5c0 lib/xarray.c:246 filemap_get_entry+0x1f0/0x3b0 mm/filemap.c:1860 shmem_get_folio_gfp+0x285/0x1840 mm/shmem.c:2446 shmem_get_folio mm/shmem.c:2628 [inline] shmem_write_begin+0x165/0x350 mm/shmem.c:3278 generic_perform_write+0x346/0x990 mm/filemap.c:4189 shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3454 do_iter_readv_writev+0x71a/0x9d0 vfs_iter_write+0x23e/0x600 fs/read_write.c:974 lo_write_bvec drivers/block/loop.c:245 [inline] lo_write_simple drivers/block/loop.c:266 [inline] do_req_filebacked drivers/block/loop.c:520 [inline] loop_handle_cmd drivers/block/loop.c:1926 [inline] loop_process_work+0x1429/0x21c0 drivers/block/loop.c:1961 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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