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To: syzbot , io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <68c097c6.050a0220.3c6139.000c.GAE@google.com> Content-Language: en-US From: Jens Axboe In-Reply-To: <68c097c6.050a0220.3c6139.000c.GAE@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 9/9/25 3:10 PM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: be5d4872e528 Add linux-next specific files for 20250905 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1458a962580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=114fb6eb337a294b > dashboard link: https://syzkaller.appspot.com/bug?extid=42d478f812698fed9f41 > compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1510d312580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1258a962580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/fb814704342a/disk-be5d4872.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/4f4366b3c12b/vmlinux-be5d4872.xz > kernel image: https://storage.googleapis.com/syzbot-assets/7b2472ced6f9/bzImage-be5d4872.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+42d478f812698fed9f41@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > WARNING: mm/vmalloc.c:538 at vmap_pages_pte_range mm/vmalloc.c:538 [inline], CPU#0: syz.0.17/6034 > WARNING: mm/vmalloc.c:538 at vmap_pages_pmd_range mm/vmalloc.c:569 [inline], CPU#0: syz.0.17/6034 > WARNING: mm/vmalloc.c:538 at vmap_pages_pud_range mm/vmalloc.c:587 [inline], CPU#0: syz.0.17/6034 > WARNING: mm/vmalloc.c:538 at vmap_pages_p4d_range mm/vmalloc.c:605 [inline], CPU#0: syz.0.17/6034 > WARNING: mm/vmalloc.c:538 at vmap_small_pages_range_noflush mm/vmalloc.c:627 [inline], CPU#0: syz.0.17/6034 > WARNING: mm/vmalloc.c:538 at __vmap_pages_range_noflush+0xdf1/0xf30 mm/vmalloc.c:656, CPU#0: syz.0.17/6034 > Modules linked in: > CPU: 0 UID: 0 PID: 6034 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 > RIP: 0010:vmap_pages_pte_range mm/vmalloc.c:538 [inline] > RIP: 0010:vmap_pages_pmd_range mm/vmalloc.c:569 [inline] > RIP: 0010:vmap_pages_pud_range mm/vmalloc.c:587 [inline] > RIP: 0010:vmap_pages_p4d_range mm/vmalloc.c:605 [inline] > RIP: 0010:vmap_small_pages_range_noflush mm/vmalloc.c:627 [inline] > RIP: 0010:__vmap_pages_range_noflush+0xdf1/0xf30 mm/vmalloc.c:656 > Code: eb 7b e8 92 1e ad ff eb 2f e8 8b 1e ad ff eb 6d e8 84 1e ad ff 31 ed eb 64 e8 7b 1e ad ff 90 0f 0b 90 eb 14 e8 70 1e ad ff 90 <0f> 0b 90 eb 09 e8 65 1e ad ff 90 0f 0b 90 bd f4 ff ff ff 44 8b 74 > RSP: 0018:ffffc90003dff950 EFLAGS: 00010293 > RAX: ffffffff8213e750 RBX: dffffc0000000000 RCX: ffff888030da3c80 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8213e9c5 > R10: fffff520014d3800 R11: ffffed10170c7fa9 R12: ffff888028890828 > R13: ffff88802e700d08 R14: 0000000000000000 R15: 1ffff11005ce01a1 > FS: 0000555592944500(0000) GS:ffff8881257ba000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000001b32163fff CR3: 0000000077ab6000 CR4: 00000000003526f0 > Call Trace: > > vmap_pages_range_noflush mm/vmalloc.c:681 [inline] > vmap_pages_range mm/vmalloc.c:701 [inline] > vmap+0x1ca/0x310 mm/vmalloc.c:3515 > io_region_init_ptr+0x24d/0x350 io_uring/memmap.c:125 > io_create_region+0x3a4/0x480 io_uring/memmap.c:228 > io_allocate_scq_urings+0x2b0/0x870 io_uring/io_uring.c:3626 > io_uring_create+0x591/0xba0 io_uring/io_uring.c:3867 > io_uring_setup io_uring/io_uring.c:3963 [inline] > __do_sys_io_uring_setup io_uring/io_uring.c:3997 [inline] > __se_sys_io_uring_setup+0x264/0x270 io_uring/io_uring.c:3988 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f3093f8ebe9 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fffcd7235a8 EFLAGS: 00000206 ORIG_RAX: 00000000000001a9 > RAX: ffffffffffffffda RBX: 00007f30941c5fa0 RCX: 00007f3093f8ebe9 > RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000007688 > RBP: 0000200000000040 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 > R13: 0000000000000000 R14: 0000000000007688 R15: 0000000000000000 > This seems specific to the 0905 release, which had some sketchy mm bits in it. Doesn't reproduce on my -next branch, mainline, or on newer linux-next either. Hence most likely a specific mm issue in that broken release. #syz invalid -- Jens Axboe