WARNING in __alloc_skb

Status: premoderation: reported C repro on 2025/08/22 06:38
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+5f8f10540e29be7399f0@syzkaller.appspotmail.com
First crash: 346d, last: 42d
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/08/24 lts (merge base) 259f4977409c C [report] WARNING in __alloc_skb
2025/08/24 upstream (ToT) 8d245acc1e88 C [report] WARNING in __alloc_skb
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __alloc_skb (4) mm -1 syz, C 8 143d 341d 0/29 upstream: reported C repro on 2025/08/27 21:55
upstream WARNING in __alloc_skb (3) ppp -1 syz, C 2 910d 910d 25/29 fixed on 2024/03/29 01:33
upstream WARNING in __alloc_skb arm-msm net -1 syz, C error 24 1973d 1985d 20/29 fixed on 2021/04/09 19:46
linux-6.1 WARNING in __alloc_skb origin:upstream -1 syz, C done 2 999d 999d 3/3 fixed on 2023/12/11 10:30
upstream WARNING in __alloc_skb (2) ppp -1 syz, C done 2 981d 995d 25/29 fixed on 2024/01/20 21:18
linux-5.15 WARNING in __alloc_skb origin:upstream -1 syz 1 299d 385d 0/3 auto-obsoleted due to no activity on 2026/01/16 10:48
▶ ▼ Last patch testing requests (5)
Created Duration User Patch Repo Result
2026/07/11 13:51 15m retest repro android16-6.12 log
2026/04/13 13:39 11m retest repro android16-6.12 report log
2026/02/02 12:13 16m retest repro android16-6.12 report log
2025/11/24 08:55 8m retest repro android16-6.12 error
2025/09/14 06:12 15m retest repro android16-6.12 report log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 17 at mm/page_alloc.c:5225 __alloc_pages_noprof+0xe8/0x7b0 mm/page_alloc.c:5225
Modules linked in:
CPU: 0 UID: 0 PID: 17 Comm: ksoftirqd/0 Not tainted syzkaller #0 0043dfd2fbaf315da186ee57f2b2b1c8bfff300f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__alloc_pages_noprof+0xe8/0x7b0 mm/page_alloc.c:5225
Code: 00 0f 1f 44 00 00 83 fb 0b 72 28 b8 00 20 00 00 23 44 24 40 75 1d 80 3d 81 26 ee 05 00 0f 85 be 00 00 00 c6 05 74 26 ee 05 01 <0f> 0b 31 c0 e9 b0 00 00 00 83 fb 0a 0f 87 a5 00 00 00 44 8b 64 24
RSP: 0018:ffffc90000117820 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000014 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc900001178d8
RBP: ffffc90000117958 R08: ffffc900001178d7 R09: 0000000000000000
R10: ffffc900001178c0 R11: fffff52000022f1b R12: ffffc90000117860
R13: dffffc0000000000 R14: 1ffff92000022f08 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005601d0bc2da8 CR3: 000000011e2a2000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 ___kmalloc_large_node+0x9c/0x1d0 mm/slub.c:4295
 __kmalloc_large_node_noprof+0x1e/0xe0 mm/slub.c:4324
 __do_kmalloc_node mm/slub.c:4340 [inline]
 __kmalloc_node_track_caller_noprof+0x262/0x440 mm/slub.c:4371
 kmalloc_reserve+0x380/0x500 net/core/skbuff.c:626
 __alloc_skb+0x144/0x370 net/core/skbuff.c:687
 __netdev_alloc_skb+0x108/0x420 net/core/skbuff.c:751
 rx_submit+0x110/0x8e0 drivers/net/usb/usbnet.c:-1
 rx_alloc_submit+0xaa/0x140 drivers/net/usb/usbnet.c:1528
 usbnet_bh+0x76c/0x990 drivers/net/usb/usbnet.c:1597
 usbnet_bh_tasklet+0x20/0x30 drivers/net/usb/usbnet.c:1615
 tasklet_action_common+0x235/0x630 kernel/softirq.c:856
 tasklet_action+0x28/0x30 kernel/softirq.c:882
 handle_softirqs+0x1ab/0x630 kernel/softirq.c:621
 run_ksoftirqd+0x20/0x30 kernel/softirq.c:999
 smpboot_thread_fn+0x490/0x8c0 kernel/smpboot.c:164
 kthread+0x2c7/0x370 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
---[ end trace 0000000000000000 ]---

Crashes (21):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/23 20:37 android16-6.12 c9198633ac9e bf27483f .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2026/06/22 04:51 android16-6.12 8f68185b8289 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2026/06/21 03:55 android16-6.12 8f68185b8289 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2026/06/20 11:03 android16-6.12 8f68185b8289 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2026/06/20 10:35 android16-6.12 8f68185b8289 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2026/06/19 15:31 android16-6.12 8f68185b8289 570c59ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2026/06/19 13:30 android16-6.12 8f68185b8289 570c59ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2026/06/19 00:39 android16-6.12 8f68185b8289 a776b0d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2026/06/18 22:53 android16-6.12 8f68185b8289 a776b0d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2026/06/17 18:55 android16-6.12 8f68185b8289 b62b3ded .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2026/06/17 05:54 android16-6.12 8f68185b8289 62cc6db3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2026/04/17 07:40 android16-6.12 100d1d1c17f8 de0a551d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2026/03/01 19:22 android16-6.12 7de305bfa436 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2026/02/28 10:55 android16-6.12 7de305bfa436 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2025/10/17 01:53 android16-6.12 ab30be3dcaff 19568248 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2025/08/31 02:18 android16-6.12 6879524e1c5a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2025/08/30 00:59 android16-6.12 6879524e1c5a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2025/08/26 01:59 android16-6.12 48363298ca74 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2025/08/24 22:09 android16-6.12 c9198633ac9e bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2025/08/23 19:48 android16-6.12 c9198633ac9e bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
2025/08/22 06:37 android16-6.12 501f58f107ab bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in __alloc_skb
* Struck through repros no longer work on HEAD.