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Tue, 20 Oct 2026 11:20:30 -0700 (PDT) Date: Tue, 20 Oct 2026 11:20:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ad7b0ee.5c73e770.1a06c9.013b.GAE@google.com> Subject: [syzbot] [mtd?] Internal error in mtd_read_oob_std From: syzbot To: joern@lazybastard.org, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, miquel.raynal@bootlin.com, richard@nod.at, syzkaller-bugs@googlegroups.com, vigneshr@ti.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 2f2f7eeef8b0 Merge tag 'soc-fixes-7.3-3' of git://git.kern.. git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux master console output: https://syzkaller.appspot.com/x/log.txt?x=12cfd20d580000 kernel config: https://syzkaller.appspot.com/x/.config?x=644925403e5fc5f8 dashboard link: https://syzkaller.appspot.com/bug?extid=eaaabe90f486cb6f31b2 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=15845da9580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=115c960d580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/fa3fbcfdac58/non_bootable_disk-2f2f7eee.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0db2a9d79647/vmlinux-2f2f7eee.xz kernel image: https://storage.googleapis.com/syzbot-assets/4415d93465b1/Image-2f2f7eee.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+eaaabe90f486cb6f31b2@syzkaller.appspotmail.com Internal error: synchronous external abort: 0000000096000010 [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 3660 Comm: syz.2.17 Tainted: G M syzkaller #0 PREEMPT Tainted: [M]=MACHINE_CHECK Hardware name: linux,dummy-virt (DT) pstate: 81402009 (Nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) pc : __memcpy+0xc/0x44 arch/arm64/lib/memcpy.S:251 lr : phram_read+0x28/0x40 drivers/mtd/devices/phram.c:70 sp : ffff80008671b7c0 x29: ffff80008671b7c0 x28: f7f0000012970000 x27: 0000000000000000 x26: 0000000000003030 x25: 0000000000002000 x24: 0000000000000000 x23: 0000000000000000 x22: 0000000000000000 x21: ffff80008671b830 x20: ffff80008671b840 x19: 0000000000000044 x18: 00000000ffffffff x17: ffff800083ab372d x16: ffff800083ab3708 x15: f9f0000006deb280 x14: ffff80008671b600 x13: f9f0000006deba1c x12: 0000550855e43902 x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 x8 : 0000000000000000 x7 : dead000000000122 x6 : 0000000000000000 x5 : ffff8000c0000000 x4 : ffff80008671b8e4 x3 : ffff80008671b8e4 x2 : 0000000000000044 x1 : ffff8000c0000000 x0 : ffff80008671b8e4 Call trace: __memcpy+0xc/0x44 arch/arm64/lib/memcpy.S:250 (P) mtd_read_oob_std+0x84/0x9c drivers/mtd/mtdcore.c:1702 mtd_read_oob+0x8c/0x15c drivers/mtd/mtdcore.c:1811 mtd_read+0x68/0xc4 drivers/mtd/mtdcore.c:1603 scan_header drivers/mtd/ftl.c:164 [inline] ftl_add_mtd+0xec/0x6a8 drivers/mtd/ftl.c:1017 blktrans_notify_add drivers/mtd/mtd_blkdevs.c:464 [inline] blktrans_notify_add+0x50/0x74 drivers/mtd/mtd_blkdevs.c:456 add_mtd_device+0x45c/0x7a8 drivers/mtd/mtdcore.c:828 mtd_device_parse_register+0x294/0x35c drivers/mtd/mtdcore.c:1156 register_device+0x104/0x260 drivers/mtd/devices/phram.c:162 phram_setup+0x16c/0x2a0 drivers/mtd/devices/phram.c:324 phram_param_call+0x60/0x84 drivers/mtd/devices/phram.c:349 param_attr_store+0xa4/0x100 kernel/params.c:591 module_attr_store+0x24/0x40 kernel/params.c:906 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 Code: d65f03c0 d503245f d503201f aa0003e3 (1d010443) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: d65f03c0 ret 4: d503245f bti c 8: d503201f nop c: aa0003e3 mov x3, x0 * 10: 1d010443 cpyp [x3]!, [x1]!, x2! <-- trapping instruction --- 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