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oAjeikazzzOWJDyJPMPVRlBs6gSomXvYLIah5x4eh25/JBxgN11SzckLQ3JnGJO1ofNesjVxuqhvoSgmR82+RNbb8u2v89kT8b+IamQIVOfXkKI2nd5C9zT6RqjeVoVrydV+kwVhU2gLiw/UHShZjD0pEPKm9mdRx/imkb58DYeqc1ZpGQXmcQy5ApdEefWw X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi, This is already addressed in https://lore.kernel.org/linux-mm/b2fb6b9c-376d-4e9b-905e-26d847fd3865@lucifer.local/ this just doesn't exist in -next/upstream yet. I _think_ we may be doing a 2nd PR for mm? But if not it'll be fixed in an early rc. To make the point, friendly bot - let's have you try out the fix: #syz test: git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/ mm-stable Thanks, Lorenzo On Wed, Apr 02, 2025 at 03:01:20AM -0700, syzbot wrote: > syzbot has found a reproducer for the following issue on: > > HEAD commit: acc4d5ff0b61 Merge tag 'net-6.15-rc0' of git://git.kernel... > git tree: upstream > console+strace: https://syzkaller.appspot.com/x/log.txt?x=16719404580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=24f9c4330e7c0609 > dashboard link: https://syzkaller.appspot.com/bug?extid=e3385f43b2897a19be24 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=175a4fb0580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1687b7b0580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/e4bfa652b34a/disk-acc4d5ff.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/3d19beb8bb92/vmlinux-acc4d5ff.xz > kernel image: https://storage.googleapis.com/syzbot-assets/e7298ccc6331/bzImage-acc4d5ff.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+e3385f43b2897a19be24@syzkaller.appspotmail.com > > Oops: general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] SMP KASAN PTI > KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] > CPU: 0 UID: 0 PID: 5840 Comm: syz-executor163 Not tainted 6.14.0-syzkaller-12456-gacc4d5ff0b61 #0 PREEMPT(full) > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 > RIP: 0010:vrm_uncharge mm/mremap.c:964 [inline] > RIP: 0010:expand_vma_in_place mm/mremap.c:1566 [inline] > RIP: 0010:expand_vma mm/mremap.c:1621 [inline] > RIP: 0010:mremap_at mm/mremap.c:1682 [inline] > RIP: 0010:do_mremap mm/mremap.c:1727 [inline] > RIP: 0010:__do_sys_mremap mm/mremap.c:1784 [inline] > RIP: 0010:__se_sys_mremap+0x25fa/0x2c00 mm/mremap.c:1752 > Code: c0 0f 85 0e 05 00 00 0f b6 9c 24 20 03 00 00 31 ff 89 de e8 d8 0d ab ff 85 db 0f 84 7b 01 00 00 e8 cb 0a ab ff e9 9e 00 00 00 <80> 78 04 00 74 0a bf 20 00 00 00 e8 26 2f 15 00 4c 8b 34 25 20 00 > RSP: 0018:ffffc900040cfb40 EFLAGS: 00010246 > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff92000819fca > RDX: 0000000000000000 RSI: 0000000010000000 RDI: 0000000000000000 > RBP: ffffc900040cff00 R08: ffffffff821d1f24 R09: ffffffff8c271397 > R10: 0000000000000004 R11: ffff888034658000 R12: 0000200000000000 > R13: ffff888077fac000 R14: 00000000180000fa R15: ffffc900040cfcd0 > FS: 0000555571cf3380(0000) GS:ffff888124f99000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00002000000000c0 CR3: 00000000316de000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f4480ba0369 > Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fff6c642778 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 > RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007f4480ba0369 > RDX: 0000000000004000 RSI: 0000000000001000 RDI: 0000200000000000 > RBP: 0000200000001000 R08: 0000200000001000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 > R13: 00007fff6c642958 R14: 0000000000000001 R15: 0000000000000001 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:vrm_uncharge mm/mremap.c:964 [inline] > RIP: 0010:expand_vma_in_place mm/mremap.c:1566 [inline] > RIP: 0010:expand_vma mm/mremap.c:1621 [inline] > RIP: 0010:mremap_at mm/mremap.c:1682 [inline] > RIP: 0010:do_mremap mm/mremap.c:1727 [inline] > RIP: 0010:__do_sys_mremap mm/mremap.c:1784 [inline] > RIP: 0010:__se_sys_mremap+0x25fa/0x2c00 mm/mremap.c:1752 > Code: c0 0f 85 0e 05 00 00 0f b6 9c 24 20 03 00 00 31 ff 89 de e8 d8 0d ab ff 85 db 0f 84 7b 01 00 00 e8 cb 0a ab ff e9 9e 00 00 00 <80> 78 04 00 74 0a bf 20 00 00 00 e8 26 2f 15 00 4c 8b 34 25 20 00 > RSP: 0018:ffffc900040cfb40 EFLAGS: 00010246 > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff92000819fca > RDX: 0000000000000000 RSI: 0000000010000000 RDI: 0000000000000000 > RBP: ffffc900040cff00 R08: ffffffff821d1f24 R09: ffffffff8c271397 > R10: 0000000000000004 R11: ffff888034658000 R12: 0000200000000000 > R13: ffff888077fac000 R14: 00000000180000fa R15: ffffc900040cfcd0 > FS: 0000555571cf3380(0000) GS:ffff888124f99000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00002000000000c0 CR3: 00000000316de000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > ---------------- > Code disassembly (best guess), 1 bytes skipped: > 0: 0f 85 0e 05 00 00 jne 0x514 > 6: 0f b6 9c 24 20 03 00 movzbl 0x320(%rsp),%ebx > d: 00 > e: 31 ff xor %edi,%edi > 10: 89 de mov %ebx,%esi > 12: e8 d8 0d ab ff call 0xffab0def > 17: 85 db test %ebx,%ebx > 19: 0f 84 7b 01 00 00 je 0x19a > 1f: e8 cb 0a ab ff call 0xffab0aef > 24: e9 9e 00 00 00 jmp 0xc7 > * 29: 80 78 04 00 cmpb $0x0,0x4(%rax) <-- trapping instruction > 2d: 74 0a je 0x39 > 2f: bf 20 00 00 00 mov $0x20,%edi > 34: e8 26 2f 15 00 call 0x152f5f > 39: 4c rex.WR > 3a: 8b .byte 0x8b > 3b: 34 25 xor $0x25,%al > 3d: 20 00 and %al,(%rax) > > > --- > 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.