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AKwUvBxmCP4eB1l39u9IrJzLNTHTWL7i2llQdQkuny1Vq433JgHo2AeHPAssLRFN+hLJ5jlcqusKOmgaAJuwjA==@vger.kernel.org X-Gm-Message-State: AFuF++n/fxu2PCgV3kxP3k9ygaKactpAb1bJQ7CVToGslPYNN8YQEu8p dVue9VJwuavWa5Ygd2y4UyrOd1JGrpAA3b3O5UAenQuN/8K54Movcb6AgI1hq/W1/Q2f68W52oh h2YOjeD/H9Q5jJBZAu+g7ZBN7hThz5Rql4hGIImlPpOOP6nH2wakFc896uAk= Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:81d3:b0:6b1:42ab:d040 with SMTP id 006d021491bc7-6ca9ab3c96dmr9931207eaf.28.1790006012954; Mon, 21 Sep 2026 08:53:32 -0700 (PDT) Date: Mon, 21 Sep 2026 08:53:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ab152fc.71f81b7d.15fa6d.0031.GAE@google.com> Subject: [syzbot] [block?] WARNING: zero-size vmalloc in disksize_store From: syzbot To: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, minchan@kernel.org, senozhatsky@chromium.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 73ae59e97596 Merge tag 'erofs-for-7.3-rc1-2' of git://git... git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux master console output: https://syzkaller.appspot.com/x/log.txt?x=11d5d525580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c35e49327a11721f dashboard link: https://syzkaller.appspot.com/bug?extid=fb23651a7efbea8868ed compiler: aarch64-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=175514c9580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=123b1005580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/fa3fbcfdac58/non_bootable_disk-73ae59e9.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9a72e0bdbe94/vmlinux-73ae59e9.xz kernel image: https://storage.googleapis.com/syzbot-assets/d050a726f316/Image-73ae59e9.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+fb23651a7efbea8868ed@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: mm/vmalloc.c:4038 at __vmalloc_node_range_noprof+0x798/0x8ec mm/vmalloc.c:4038, CPU#0: syz.2.17/3661 Modules linked in: CPU: 0 UID: 0 PID: 3661 Comm: syz.2.17 Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: linux,dummy-virt (DT) pstate: 01402009 (nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) pc : __vmalloc_node_range_noprof+0x798/0x8ec mm/vmalloc.c:4038 lr : __vmalloc_node_noprof mm/vmalloc.c:4166 [inline] lr : vzalloc_noprof+0x94/0xa4 mm/vmalloc.c:4244 sp : ffff800089a53b20 x29: ffff800089a53b30 x28: fcf00000046e0000 x27: 00000000ffffffff x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000 x23: 0000000000000000 x22: f3f00000057d3140 x21: 0000000000000012 x20: 0000000000000000 x19: f3f00000057d3100 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000020000000 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000080000000 x11: 0000000000000000 x10: 0fffffffffffffff x9 : 0000000000000010 x8 : 00000000ffffffbf x7 : 00000000ffffffff x6 : 0000000000000000 x5 : 00e8000000000403 x4 : 0000000000000dc0 x3 : ffffc1ffbf800000 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: __vmalloc_node_range_noprof+0x798/0x8ec mm/vmalloc.c:4038 (P) __vmalloc_node_noprof mm/vmalloc.c:4166 [inline] vzalloc_noprof+0x94/0xa4 mm/vmalloc.c:4244 zram_meta_alloc drivers/block/zram/zram_drv.c:1982 [inline] disksize_store+0x64/0x1b0 drivers/block/zram/zram_drv.c:2872 dev_attr_store+0x18/0x2c drivers/base/core.c:2509 sysfs_kf_write+0x7c/0x98 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x138/0x200 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x244/0x36c fs/read_write.c:687 ksys_write+0x70/0x108 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x18/0x24 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x54/0x10c arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:121 do_el0_svc+0x1c/0x34 arch/arm64/kernel/syscall.c:140 el0_svc+0x38/0x1fc arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:590 ---[ end trace 0000000000000000 ]--- --- 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