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 gzPPPd9X XmXsWsFAdEthruY4I4uc2unvRshD/7Id9F+fdlNjQsQjvztVDbRaY8Y63jww8UtduJ2JQOWErJWI8XD5rw6DMhF7smqvHRAhnK6gSSUs0PwKmobhFdJycgZysjBRYL3XI6t3h6Ibg2m/m/iMdJM8FhWOC11ZV3DmpVAIgIeNoWmVYGMiPCU94wDAiN7WUkmMh3qaulcI/8w3thQ6C2C3cxO7e+WalLwTVoqHIuNYMwZFGoNp+naD3Nlvq1A== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Feb 25, 2026 at 02:50:16PM +0100, David Hildenbrand (Arm) wrote: > On 2/25/26 14:43, Sasha Levin wrote: > > Hi, > > > > I've been playing around with improvements to syzkaller locally, and hit > > the > > following crash on v7.0-rc1: > > > >   vma ffff888109f988c0 start 0000555580cc0000 end 0000555580ce2000 mm > > ffff8881048e1780 > >   prot 8000000000000025 anon_vma ffff88810b20f100 vm_ops 0000000000000000 > >   pgoff 555580cc0 file 0000000000000000 private_data 0000000000000000 > >   refcnt 1 > >   flags: 0x100073(read|write|mayread|maywrite|mayexec|account) > >   ------------[ cut here ]------------ > >   kernel BUG at mm/huge_memory.c:2999! > >   Oops: invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI > >   CPU: 3 UID: 0 PID: 15162 Comm: syz.7.3120 Tainted: G > > N  7.0.0-rc1-00001-gc5447a46efed #51 PREEMPT(full) > >   Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0- > > debian-1.17.0-1 04/01/2014 > >   RIP: 0010:split_huge_pmd_locked+0x11a0/0x2f80 > >   RSP: 0018:ffff888053cc7338 EFLAGS: 00010282 > >   RAX: 0000000000000126 RBX: ffff888109f988d0 RCX: 0000000000000000 > >   RDX: 0000000000000126 RSI: 0000000000000000 RDI: ffffed100a798e43 > >   RBP: 0000555580cc0000 R08: ffffffffa3e62775 R09: 0000000000000001 > >   R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000080 > >   R13: 0000000000000000 R14: 0000555580c00000 R15: ffff888109f988c0 > >   FS:  0000000000000000(0000) GS:ffff88816f701000(0000) > > knlGS:0000000000000000 > >   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > >   CR2: 00007fe2ac1907a0 CR3: 0000000021c91000 CR4: 0000000000750ef0 > >   PKRU: 80000000 > >   Call Trace: > >    > >    __split_huge_pmd+0x201/0x350 > >    unmap_page_range+0xa6a/0x3db0 > >    unmap_single_vma+0x14b/0x230 > >    unmap_vmas+0x28f/0x580 > >    exit_mmap+0x203/0xa80 > >    __mmput+0x11b/0x540 > >    mmput+0x81/0xa0 > >    do_exit+0x7b9/0x2c60 > >    do_group_exit+0xd5/0x2a0 > >    get_signal+0x1fdc/0x2340 > >    arch_do_signal_or_restart+0x93/0x790 > >    exit_to_user_mode_loop+0x84/0x480 > >    do_syscall_64+0x4df/0x700 > >    entry_SYSCALL_64_after_hwframe+0x77/0x7f > >    > >   Kernel panic - not syncing: Fatal exception > > > > The assertion VM_BUG_ON_VMA(vma->vm_start > haddr, vma) fires at > > mm/huge_memory.c:2999 because a huge PMD exists at PMD-aligned address > > 0x555580c00000 but the VMA only covers [0x555580cc0000, 0x555580ce2000): > > a 136KB region starting 816KB past the PMD base. > > Do you have a reproducer and would this trigger before v7.0-rc1? > > Lorenzo did some changes around anon_vma locking recently, maybe related > to that. A quick glance doesn't suggest any changes I made should have had an impact here. _Should have_ :) I think without a reproducer this is going to be hard to pinpoint. Hopefully syzbot proper should figure one out eventually? > > -- > Cheers, > > David Thanks, Lorenzo