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Message-ID: <6878f199.a70a0220.693ce.0047.GAE@google.com> Date: Thu, 17 Jul 2025 05:50:33 -0700 From: syzbot <syzbot+6048f8e5da91c7055339@...kaller.appspotmail.com> To: abbotti@....co.uk, hsweeten@...ionengravers.com, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [kernel?] WARNING in comedi_compat_ioctl Hello, syzbot found the following issue on: HEAD commit: 3f31a806a62e Merge tag 'mm-hotfixes-stable-2025-07-11-16-1.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=152307d4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=84eae426cbd8669c dashboard link: https://syzkaller.appspot.com/bug?extid=6048f8e5da91c7055339 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-3f31a806.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/51112e82d2bc/vmlinux-3f31a806.xz kernel image: https://storage.googleapis.com/syzbot-assets/dfafec79e704/bzImage-3f31a806.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6048f8e5da91c7055339@...kaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 0 PID: 6660 at mm/page_alloc.c:4935 __alloc_frozen_pages_noprof+0x30b/0x23f0 mm/page_alloc.c:4935 Modules linked in: CPU: 0 UID: 0 PID: 6660 Comm: syz.2.103 Not tainted 6.16.0-rc5-syzkaller-00266-g3f31a806a62e #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:__alloc_frozen_pages_noprof+0x30b/0x23f0 mm/page_alloc.c:4935 Code: f0 5b 5d 41 5c 41 5d 41 5e 41 5f e9 8f 12 73 09 83 fe 0a 0f 86 0a fe ff ff 80 3d 17 9d 7d 0e 00 75 0b c6 05 0e 9d 7d 0e 01 90 <0f> 0b 90 45 31 f6 eb 81 4d 85 f6 74 22 44 89 fa 89 ee 4c 89 f7 e8 RSP: 0018:ffffc9000dfe7988 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 000000000000001a RDI: 0000000000040dc0 RBP: 00000027fffffb00 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 000000000000001a R13: 1ffff92001bfcf46 R14: 00000027fffffb00 R15: 000000000000001a FS: 0000000000000000(0000) GS:ffff888097520000(0063) knlGS:00000000f503cb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f7496188 CR3: 0000000066b87000 CR4: 0000000000352ef0 Call Trace: <TASK> __alloc_pages_noprof+0xb/0x1b0 mm/page_alloc.c:4993 __alloc_pages_node_noprof include/linux/gfp.h:284 [inline] alloc_pages_node_noprof include/linux/gfp.h:311 [inline] ___kmalloc_large_node+0x84/0x1e0 mm/slub.c:4272 __kmalloc_large_node_noprof+0x1c/0x70 mm/slub.c:4300 __do_kmalloc_node mm/slub.c:4316 [inline] __kmalloc_noprof.cold+0xc/0x61 mm/slub.c:4340 kmalloc_noprof include/linux/slab.h:909 [inline] kmalloc_array_noprof include/linux/slab.h:948 [inline] compat_insnlist drivers/comedi/comedi_fops.c:3145 [inline] comedi_compat_ioctl+0x3e9/0x910 drivers/comedi/comedi_fops.c:3225 __do_compat_sys_ioctl fs/ioctl.c:1005 [inline] __se_compat_sys_ioctl fs/ioctl.c:948 [inline] __ia32_compat_sys_ioctl+0x23f/0x370 fs/ioctl.c:948 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf708e579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f503c55c EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000008008640b RDX: 0000000080000080 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi --- 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@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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