Hello, syzbot found the following issue on: HEAD commit: 6fea5fabd332 Merge tag 'mm-hotfixes-stable-2025-04-19-21-2.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15551ccc580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b7c08f42e927242f dashboard link: https://syzkaller.appspot.com/bug?extid=3291296495fc970e4b1c compiler: aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17551ccc580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13a7f4cc580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/384ffdcca292/non_bootable_disk-6fea5fab.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/59473b9bbb43/vmlinux-6fea5fab.xz kernel image: https://storage.googleapis.com/syzbot-assets/a2e0095d3721/Image-6fea5fab.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3291296495fc970e4b1c@xxxxxxxxxxxxxxxxxxxxxxxxx Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 user pgtable: 4k pages, 52-bit VAs, pgdp=00000000442aa200 [0000000000000008] pgd=080000004b293403, p4d=080000004b27f403, pud=080000004b237403, pmd=0000000000000000 Internal error: Oops: 0000000096000006 [#1] SMP Modules linked in: CPU: 1 UID: 0 PID: 6338 Comm: syz-executor150 Not tainted 6.15.0-rc2-syzkaller-00488-g6fea5fabd332 #0 PREEMPT Hardware name: linux,dummy-virt (DT) pstate: 41402009 (nZcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) pc : bdev_nr_sectors include/linux/blkdev.h:831 [inline] pc : guard_bio_eod+0x18/0x210 block/bio.c:694 lr : mpage_bio_submit_read fs/mpage.c:74 [inline] lr : do_mpage_readpage+0x2d0/0x6dc fs/mpage.c:296 sp : ffff80008331b820 x29: ffff80008331b820 x28: f4f0000004143e00 x27: ffff80008331b960 x26: 0000000000000001 x25: ffff80008331b940 x24: 0000000000000000 x23: 0000000000000000 x22: 0000000000000000 x21: ffffc1ffc02c9dc0 x20: 0000000000000010 x19: f4f0000004143e00 x18: 0000000000001000 x17: 0000000000000000 x16: 1e9e000000c6abc1 x15: 0000000000000000 x14: ffffc1ffc02c9dc0 x13: 0000000000000000 x12: f4f0000004143e00 x11: 0000000000000000 x10: ffffc1ffc02ca580 x9 : 0000000000000003 x8 : 00000000000000b8 x7 : fcf0000003f3b97c x6 : f6f0000006355c00 x5 : f6f0000006355c00 x4 : 0000000000000000 x3 : 0000000000000000 x2 : 0000000000000000 x1 : ffff8000803bbfc0 x0 : 0000000000000000 Call trace: bdev_nr_sectors include/linux/blkdev.h:831 [inline] (P) guard_bio_eod+0x18/0x210 block/bio.c:694 (P) mpage_bio_submit_read fs/mpage.c:74 [inline] do_mpage_readpage+0x2d0/0x6dc fs/mpage.c:296 mpage_readahead+0xcc/0x164 fs/mpage.c:371 blkdev_readahead+0x18/0x24 block/fops.c:472 read_pages+0x70/0x2b8 mm/readahead.c:160 page_cache_ra_unbounded+0x1d4/0x260 mm/readahead.c:280 do_page_cache_ra mm/readahead.c:327 [inline] page_cache_ra_order+0x34c/0x400 mm/readahead.c:532 do_sync_mmap_readahead mm/filemap.c:3262 [inline] filemap_fault+0x444/0x924 mm/filemap.c:3403 __do_fault+0x3c/0x21c mm/memory.c:5098 do_shared_fault mm/memory.c:5582 [inline] do_fault mm/memory.c:5656 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0xadc/0x1b00 mm/memory.c:6140 handle_mm_fault+0x164/0x314 mm/memory.c:6309 do_page_fault+0x118/0x688 arch/arm64/mm/fault.c:647 do_translation_fault+0xac/0xbc arch/arm64/mm/fault.c:783 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:919 el0_da+0x78/0xa8 arch/arm64/kernel/entry-common.c:604 el0t_64_sync_handler+0xc4/0x138 arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:600 Code: 910003fd a90153f3 aa0003f3 f9400400 (f9400400) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 910003fd mov x29, sp 4: a90153f3 stp x19, x20, [sp, #16] 8: aa0003f3 mov x19, x0 c: f9400400 ldr x0, [x0, #8] * 10: f9400400 ldr x0, [x0, #8] <-- 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@xxxxxxxxxxxxxxxx. 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
