Re: [moderation/CI] Re: pull request: fixes for ovpn 2026-08-07

#syz upstream

On Fri, Aug 7, 2026 at 7:21 AM syzbot ci
<[email protected]> wrote:
>
> syzbot ci has tested the following series
>
> [v1] pull request: fixes for ovpn 2026-08-07
> https://lore.kernel.org/all/[email protected]
> * [PATCH net 1/4] ovpn: fix NULL dereference when killing missing key
> * [PATCH net 2/4] ovpn: finish crypto callback cleanup before peer release
> * [PATCH net 3/4] ovpn: run deferred work on a module-owned workqueue
> * [PATCH net 4/4] ovpn: defer key slot crypto freeing to workqueue
>
> and found the following issue:
> WARNING in __alloc_workqueue
>
> Full report is available here:
> https://ci.syzbot.org/series/a46f06c7-f8d8-4053-a746-91498a46c290
>
> ***
>
> WARNING in __alloc_workqueue
>
> tree:      net
> URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net.git
> base:      594d905195024b228c962627ae5ae7c17bd582a4
> arch:      amd64
> compiler:  Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
> config:    https://ci.syzbot.org/builds/cc426b49-07b7-496e-badf-5b0646780dd0/config
>
> usbcore: registered new interface driver udl
> bochs-drm 0000:00:01.0: vgaarb: deactivate vga console
> [drm] Found bochs VGA, ID 0xb0c5.
> [drm] Framebuffer size 16384 kB @ 0xfd000000, mmio @ 0xfebf0000.
> [drm] Initialized bochs-drm 1.0.0 for 0000:00:01.0 on minor 2
> bochs-drm 0000:00:01.0: [drm] fb1: bochs-drmdrmfb frame buffer device
> usbcore: registered new interface driver gm12u320
> usbcore: registered new interface driver gud
> brd: module loaded
> loop: module loaded
> zram: Added device: zram0
> null_blk: disk nullb0 created
> null_blk: module loaded
> Guest personality initialized and is inactive
> VMCI host device registered (name=vmci, major=10, minor=267)
> Initialized host personality
> usbcore: registered new interface driver rtsx_usb
> lpc_ich 0000:00:1f.0: I/O space for GPIO uninitialized
> usbcore: registered new interface driver viperboard
> usbcore: registered new interface driver dln2
> usbcore: registered new interface driver pn533_usb
> nfcsim 0.2 initialized
> usbcore: registered new interface driver port100
> usbcore: registered new interface driver nfcmrvl
> Loading iSCSI transport class v2.0-870.
> st: Version 20160209, fixed bufsize 32768, s/g segs 256
> ACPI: \_SB_.GSIA: Enabled at IRQ 16
> ahci 0000:00:1f.2: AHCI vers 0001.0000, 32 command slots, 1.5 Gbps, SATA mode
> ahci 0000:00:1f.2: 6/6 ports implemented (port mask 0x3f)
> ahci 0000:00:1f.2: flags: 64bit ncq only
> scsi host0: ahci
> scsi host1: ahci
> scsi host2: ahci
> scsi host3: ahci
> scsi host4: ahci
> scsi host5: ahci
> ata1: SATA max UDMA/133 abar m4096@0xfebf2000 port 0xfebf2100 irq 26 lpm-pol 1
> ata2: SATA max UDMA/133 abar m4096@0xfebf2000 port 0xfebf2180 irq 26 lpm-pol 1
> ata3: SATA max UDMA/133 abar m4096@0xfebf2000 port 0xfebf2200 irq 26 lpm-pol 1
> ata4: SATA max UDMA/133 abar m4096@0xfebf2000 port 0xfebf2280 irq 26 lpm-pol 1
> ata5: SATA max UDMA/133 abar m4096@0xfebf2000 port 0xfebf2300 irq 26 lpm-pol 1
> ata6: SATA max UDMA/133 abar m4096@0xfebf2000 port 0xfebf2380 irq 26 lpm-pol 1
> Rounding down aligned max_sectors from 4294967295 to 4294967288
> db_root: cannot open: /etc/target
> slram: not enough parameters.
> ftl_cs: FTL header not found.
> wireguard: WireGuard 1.0.0 loaded. See www.wireguard.com for information.
> wireguard: Copyright (C) 2015-2019 Jason A. Donenfeld <[email protected]>. All Rights Reserved.
> ------------[ cut here ]------------
> workqueue: ovpn is using neither WQ_PERCPU or WQ_UNBOUND. Setting WQ_PERCPU.
> WARNING: kernel/workqueue.c:5852 at __alloc_workqueue+0x1cf5/0x2060, CPU#0: swapper/0/1
> Modules linked in:
> CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> RIP: 0010:__alloc_workqueue+0x1cf8/0x2060
> Code: 38 00 e9 59 f9 ff ff e8 46 96 38 00 e9 26 fb ff ff e8 3c 96 38 00 e9 a7 fb ff ff e8 32 96 38 00 48 8d 3d fb a1 cc 0e 4c 89 f6 <67> 48 0f b9 3a 81 cd 00 01 00 00 e9 a7 e5 ff ff e8 13 96 38 00 48
> RSP: 0000:ffffc900000677a8 EFLAGS: 00010293
> RAX: ffffffff818e8c5e RBX: 0000000000000000 RCX: ffff888102a95940
> RDX: 0000000000000000 RSI: ffff88810c4cf570 RDI: ffffffff905b2e60
> RBP: 0000000000000000 R08: ffff888102a95940 R09: 0000000000000002
> R10: 0000000000000102 R11: 0000000000000000 R12: ffffc900000678c0
> R13: ffff88810c4cf400 R14: ffff88810c4cf570 R15: 0000000000000000
> FS:  0000000000000000(0000) GS:ffff88818d934000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffff88823ffff000 CR3: 000000000e946000 CR4: 00000000000006f0
> Call Trace:
>  <TASK>
>  alloc_workqueue_noprof+0xe3/0x210
>  ovpn_init+0x1b/0xb0
>  do_one_initcall+0x250/0x870
>  do_initcall_level+0x10a/0x1a0
>  do_initcalls+0x59/0xa0
>  kernel_init_freeable+0x29d/0x3e0
>  kernel_init+0x1d/0x1d0
>  ret_from_fork+0x514/0xb70
>  ret_from_fork_asm+0x1a/0x30
>  </TASK>
>
>
> ***
>
> If these findings have caused you to resend the series or submit a
> separate fix, please add the following tag to your commit message:
>   Tested-by: [email protected]
>
> ---
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-- 
Ⲡⲟⲓⲙⲏⲛ Ⲅⲉⲱⲣⲅⲓⲟⲥ - Pimyn Girgis
Software Engineer
Kernel Dynamic Analysis
[email protected]