Hello, syzbot found the following issue on: HEAD commit: 708283abf896 Merge tag 'dmaengine-6.6-rc1' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17424cd0680000 kernel config: https://syzkaller.appspot.com/x/.config?x=15f37e053f1602f8 dashboard link: https://syzkaller.appspot.com/bug?extid=2403e3909382fbdeaf6c compiler: aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/384ffdcca292/non_bootable_disk-708283ab.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ae645c88b07f/vmlinux-708283ab.xz kernel image: https://storage.googleapis.com/syzbot-assets/32d5997bb055/Image-708283ab.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2403e3909382fbdeaf6c@xxxxxxxxxxxxxxxxxxxxxxxxx Unable to handle kernel paging request at virtual address dfff800000000001 KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000001] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 2922 Comm: udevd Not tainted 6.5.0-syzkaller-11329-g708283abf896 #0 Hardware name: linux,dummy-virt (DT) pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : list_add_tail include/linux/list.h:183 [inline] pc : list_lru_add+0x174/0x464 mm/list_lru.c:129 lr : list_lru_from_memcg_idx mm/list_lru.c:56 [inline] lr : list_lru_from_memcg_idx mm/list_lru.c:53 [inline] lr : list_lru_from_kmem mm/list_lru.c:78 [inline] lr : list_lru_add+0x354/0x464 mm/list_lru.c:128 sp : ffff80008dd57520 x29: ffff80008dd57520 x28: 0000000000000008 x27: ffff0000378c4000 x26: 0000000000000001 x25: 0000000000000000 x24: 0000000000000000 x23: 1fffe0000293550a x22: 0000000000000000 x21: ffff000012d1c7a0 x20: ffff0000149aa850 x19: ffff0000146f7a00 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: ffff800080915234 x14: ffff800080914c58 x13: ffff800080914c58 x12: 000000000000f1f1 x11: dfff800000000000 x10: 00000000f3000000 x9 : 00000000f3f3f3f3 x8 : ffff700011baae76 x7 : 00000000f1f1f1f1 x6 : dfff800000000000 x5 : ffff700011baae7a x4 : 00000000f204f1f1 x3 : 1fffe0000d51ff28 x2 : 0000000000000000 x1 : 0000000000000000 x0 : dfff800000000000 Call trace: list_add_tail include/linux/list.h:183 [inline] list_lru_add+0x174/0x464 mm/list_lru.c:129 d_lru_add+0x180/0x31c fs/dcache.c:431 retain_dentry fs/dcache.c:685 [inline] dput+0x4ac/0x96c fs/dcache.c:908 handle_mounts fs/namei.c:1554 [inline] step_into+0xc18/0x16c4 fs/namei.c:1839 walk_component+0xa8/0x484 fs/namei.c:2007 link_path_walk.part.0.constprop.0+0x4cc/0x970 fs/namei.c:2328 link_path_walk fs/namei.c:2253 [inline] path_openat+0x1bc/0x2058 fs/namei.c:3792 do_filp_open+0x16c/0x330 fs/namei.c:3823 do_sys_openat2+0x12c/0x160 fs/open.c:1422 do_sys_open fs/open.c:1437 [inline] __do_sys_openat fs/open.c:1453 [inline] __se_sys_openat fs/open.c:1448 [inline] __arm64_sys_openat+0x12c/0x1b8 fs/open.c:1448 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:51 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:136 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x58/0x140 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Code: 9100231c d2d00000 f2fbffe0 d343ff9a (38e06b40) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 9100231c add x28, x24, #0x8 4: d2d00000 mov x0, #0x800000000000 // #140737488355328 8: f2fbffe0 movk x0, #0xdfff, lsl #48 c: d343ff9a lsr x26, x28, #3 * 10: 38e06b40 ldrsb w0, [x26, x0] <-- 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 bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
