Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: BUG: unable to handle kernel paging request in mas_store_prealloc __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 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: 0 UID: 0 PID: 16112 Comm: syz.0.4215 Not tainted 6.12.0-rc7-syzkaller-00234-g887407160d72 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : mt_slot_locked lib/maple_tree.c:795 [inline] pc : mas_slot_locked lib/maple_tree.c:808 [inline] pc : mas_store_prealloc+0x870/0x1068 lib/maple_tree.c:5514 lr : mt_slot_locked lib/maple_tree.c:795 [inline] lr : mas_slot_locked lib/maple_tree.c:808 [inline] lr : mas_store_prealloc+0x778/0x1068 lib/maple_tree.c:5514 sp : ffff80009c667440 x29: ffff80009c667560 x28: ffff80009c6674c0 x27: dfff800000000000 x26: ffff7000138cce94 x25: 0000000000000008 x24: 0000000000000000 x23: 0000000000000008 x22: ffff0000dc74f840 x21: 0000000000000008 x20: ffff80009c6678e0 x19: 0000000000000000 x18: 0000000000000008 x17: 0000000000000000 x16: ffff800080585ea8 x15: 0000000000000009 x14: 1ffff000138cce99 x13: 0000000000000000 x12: 0000000000000000 x11: ffff7000138ccea2 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000001 x7 : 0000000000000000 x6 : 00000000003bbda8 x5 : ffff80009c6665f8 x4 : 0000000000000008 x3 : ffff80008b4208f0 x2 : ffffffffffffffc0 x1 : 0000000000000001 x0 : 0000000000000000 Call trace: mt_slot_locked lib/maple_tree.c:795 [inline] (P) mas_slot_locked lib/maple_tree.c:808 [inline] (P) mas_store_prealloc+0x870/0x1068 lib/maple_tree.c:5514 (P) mt_slot_locked lib/maple_tree.c:795 [inline] (L) mas_slot_locked lib/maple_tree.c:808 [inline] (L) mas_store_prealloc+0x778/0x1068 lib/maple_tree.c:5514 (L) vma_iter_store+0x2e8/0x81c mm/vma.h:476 __mmap_region mm/mmap.c:1513 [inline] mmap_region+0x1650/0x1d44 mm/mmap.c:1603 do_mmap+0x8c4/0xfac mm/mmap.c:496 vm_mmap_pgoff+0x1a0/0x38c mm/util.c:588 ksys_mmap_pgoff+0x3a4/0x5c8 mm/mmap.c:542 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Code: 393b2668 972c43de 8b180ef5 d343fea8 (387b6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 393b2668 strb w8, [x19, #3785] 4: 972c43de bl 0xfffffffffcb10f7c 8: 8b180ef5 add x21, x23, x24, lsl #3 c: d343fea8 lsr x8, x21, #3 * 10: 387b6908 ldrb w8, [x8, x27] <-- trapping instruction Tested on: commit: 88740716 Merge remote-tracking branch 'iommu/arm/smmu'.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=15aed378580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a1eb85a42cb8ccec dashboard link: https://syzkaller.appspot.com/bug?extid=bc6bfc25a68b7a020ee1 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 Note: no patches were applied.
