syzbot


WARNING in comedi_unlocked_ioctl

Status: upstream: reported C repro on 2025/07/04 08:17
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+d6995b62e5ac7d79557a@syzkaller.appspotmail.com
First crash: 6d18h, last: 1h28m
Discussions (2)
Title Replies (including bot) Last reply
[PATCH] comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large 1 (1) 2025/07/04 12:04
[syzbot] [kernel?] WARNING in comedi_unlocked_ioctl 0 (1) 2025/07/04 08:17
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in comedi_unlocked_ioctl -1 C 2 7h20m 9h15m 0/3 upstream: reported C repro on 2025/07/10 11:52

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5545 at mm/page_alloc.c:4935 __alloc_frozen_pages_noprof+0x2c8/0x370 mm/page_alloc.c:4935
Modules linked in:
CPU: 0 UID: 0 PID: 5545 Comm: syz.0.16 Not tainted 6.16.0-rc4-syzkaller-00123-g4c06e63b9203 #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+0x2c8/0x370 mm/page_alloc.c:4935
Code: 74 10 4c 89 e7 89 54 24 0c e8 24 14 0d 00 8b 54 24 0c 49 83 3c 24 00 0f 85 a5 fe ff ff e9 a6 fe ff ff c6 05 72 f5 74 0d 01 90 <0f> 0b 90 e9 18 ff ff ff a9 00 00 08 00 48 8b 4c 24 10 4c 8d 44 24
RSP: 0018:ffffc90002c0f960 EFLAGS: 00010246
RAX: ffffc90002c0f900 RBX: 0000000000000019 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90002c0f9c8
RBP: ffffc90002c0fa50 R08: ffffc90002c0f9c7 R09: 0000000000000000
R10: ffffc90002c0f9a0 R11: fffff52000581f39 R12: 0000000000000000
R13: 1ffff92000581f30 R14: 0000000000040dc0 R15: dffffc0000000000
FS:  00005555918fc500(0000) GS:ffff88808d21c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000008 CR3: 0000000012196000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __alloc_pages_noprof+0xa/0x30 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+0x85/0x210 mm/slub.c:4272
 __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:4300
 __do_kmalloc_node mm/slub.c:4316 [inline]
 __kmalloc_noprof+0x36f/0x4f0 mm/slub.c:4340
 kmalloc_noprof include/linux/slab.h:909 [inline]
 kmalloc_array_noprof include/linux/slab.h:948 [inline]
 comedi_unlocked_ioctl+0x9ee/0xf40 drivers/comedi/comedi_fops.c:2242
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6cd0d8e929
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:00007ffd9e4829b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6cd0fb5fa0 RCX: 00007f6cd0d8e929
RDX: 0000200000000000 RSI: 000000008010640b RDI: 0000000000000003
RBP: 00007f6cd0e10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6cd0fb5fa0 R14: 00007f6cd0fb5fa0 R15: 0000000000000003
 </TASK>

Crashes (71):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/04 05:27 upstream 4c06e63b9203 76ad128c .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/04 04:24 upstream 4c06e63b9203 76ad128c .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/04 03:28 upstream 4c06e63b9203 76ad128c .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/07 12:25 linux-next 26ffb3d6f02c 4f67c4ae .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in comedi_unlocked_ioctl
2025/07/10 19:38 upstream 8c2e52ebbe88 19d4829f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in comedi_unlocked_ioctl
2025/07/10 16:09 upstream 8c2e52ebbe88 19d4829f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in comedi_unlocked_ioctl
2025/07/08 01:25 upstream d7b8f8e20813 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in comedi_unlocked_ioctl
2025/07/07 20:28 upstream d7b8f8e20813 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in comedi_unlocked_ioctl
2025/07/07 19:39 upstream d7b8f8e20813 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in comedi_unlocked_ioctl
2025/07/06 23:04 upstream 1f988d0788f5 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in comedi_unlocked_ioctl
2025/07/06 17:31 upstream 1f988d0788f5 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in comedi_unlocked_ioctl
2025/07/06 04:58 upstream 05df91921da6 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in comedi_unlocked_ioctl
2025/07/05 04:44 upstream 4c06e63b9203 d869b261 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in comedi_unlocked_ioctl
2025/07/05 02:53 upstream 4c06e63b9203 d869b261 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in comedi_unlocked_ioctl
2025/07/05 01:29 upstream 4c06e63b9203 d869b261 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in comedi_unlocked_ioctl
2025/07/05 01:29 upstream 4c06e63b9203 d869b261 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in comedi_unlocked_ioctl
2025/07/10 18:32 upstream bc9ff192a6c9 d7384b6d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in comedi_unlocked_ioctl
2025/07/10 14:42 upstream 8c2e52ebbe88 d7384b6d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in comedi_unlocked_ioctl
2025/07/10 13:02 upstream 8c2e52ebbe88 d7384b6d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/10 08:08 upstream 8c2e52ebbe88 956bd956 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/10 02:11 upstream 8c2e52ebbe88 956bd956 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in comedi_unlocked_ioctl
2025/07/09 15:12 upstream 733923397fd9 956bd956 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in comedi_unlocked_ioctl
2025/07/09 11:22 upstream 733923397fd9 f4e5e155 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/09 08:38 upstream 733923397fd9 f4e5e155 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/09 06:34 upstream 733923397fd9 f4e5e155 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/09 01:48 upstream d006330be3f7 4d9fdfa4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in comedi_unlocked_ioctl
2025/07/08 13:13 upstream d7b8f8e20813 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/08 11:32 upstream d7b8f8e20813 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/08 02:42 upstream d7b8f8e20813 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/08 00:22 upstream d7b8f8e20813 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/07 22:51 upstream d7b8f8e20813 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/07 22:29 upstream d7b8f8e20813 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/07 17:27 upstream d7b8f8e20813 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/07 11:55 upstream d7b8f8e20813 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in comedi_unlocked_ioctl
2025/07/07 07:20 upstream 772b78c2abd8 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/07 06:18 upstream 772b78c2abd8 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/07 03:14 upstream 772b78c2abd8 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in comedi_unlocked_ioctl
2025/07/05 23:40 upstream a79a588fc176 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/05 19:46 upstream a79a588fc176 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in comedi_unlocked_ioctl
2025/07/05 12:32 upstream c435a4f487e8 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/05 09:27 upstream c435a4f487e8 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/05 08:46 upstream c435a4f487e8 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/05 04:50 upstream c435a4f487e8 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/05 01:01 upstream c435a4f487e8 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in comedi_unlocked_ioctl
2025/07/04 22:35 upstream c435a4f487e8 d869b261 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/04 11:39 upstream 4c06e63b9203 76ad128c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/04 09:40 upstream 4c06e63b9203 76ad128c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/04 02:46 upstream 4c06e63b9203 76ad128c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/04 02:44 upstream 4c06e63b9203 76ad128c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in comedi_unlocked_ioctl
2025/07/10 00:22 linux-next 835244aba90d f4e5e155 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in comedi_unlocked_ioctl
2025/07/07 09:44 linux-next 26ffb3d6f02c 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in comedi_unlocked_ioctl
2025/07/06 21:47 linux-next 26ffb3d6f02c 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in comedi_unlocked_ioctl
2025/07/06 20:06 linux-next 26ffb3d6f02c 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in comedi_unlocked_ioctl
2025/07/06 05:53 linux-next 26ffb3d6f02c 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in comedi_unlocked_ioctl
2025/07/06 05:12 linux-next 26ffb3d6f02c 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in comedi_unlocked_ioctl
2025/07/04 14:43 linux-next 26ffb3d6f02c 76ad128c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in comedi_unlocked_ioctl
2025/07/08 08:30 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 7482bb149b9f 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in comedi_unlocked_ioctl
* Struck through repros no longer work on HEAD.