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Wed, 28 Oct 2026 11:57:18 -0700 (PDT) Date: Wed, 28 Oct 2026 11:57:18 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ae2458e.5451848c.f7707.0000.GAE@google.com> Subject: [syzbot] [bpf?] WARNING in bpf_offload_dev_destroy From: syzbot To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, eddyz87@gmail.com, linux-kernel@vger.kernel.org, memxor@gmail.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 6b4b543fa187 Merge tag 'parisc-for-7.4-rc1' of git://git.k.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=15152d31580000 kernel config: https://syzkaller.appspot.com/x/.config?x=acf3b51ed91c8a7b dashboard link: https://syzkaller.appspot.com/bug?extid=88435e204734072bf39a compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13b06469580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+88435e204734072bf39a@syzkaller.appspotmail.com ------------[ cut here ]------------ !list_empty(&offdev->netdevs) WARNING: kernel/bpf/offload.c:817 at bpf_offload_dev_destroy+0x50/0x60 kernel/bpf/offload.c:817, CPU#1: syz-executor187/5989 Modules linked in: CPU: 1 UID: 0 PID: 5989 Comm: syz-executor187 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026 RIP: 0010:bpf_offload_dev_destroy+0x50/0x60 kernel/bpf/offload.c:817 Code: 08 00 74 08 4c 89 f7 e8 ae 97 3c 00 49 8b 06 4c 39 f0 75 10 e8 e1 29 c6 ff 48 89 df 5b 41 5e e9 e6 84 30 00 e8 d1 29 c6 ff 90 <0f> 0b 90 eb ea 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 RSP: 0018:ffffc9000427f8e8 EFLAGS: 00010293 RAX: ffffffff8202e2df RBX: ffff888077e79380 RCX: ffff88807fb99f40 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888077e79380 RBP: ffff88807f177068 R08: ffffffff919d22bf R09: 1ffffffff233a457 R10: dffffc0000000000 R11: fffffbfff233a458 R12: dffffc0000000000 R13: 1ffff1100fe2ee0f R14: ffff888077e79388 R15: ffff88807f175360 FS: 000055555df6c400(0000) GS:ffff88812372f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562affe20950 CR3: 0000000033214000 CR4: 0000000000350ef0 Call Trace: nsim_drv_remove+0x60/0x170 drivers/net/netdevsim/dev.c:1727 device_remove drivers/base/dd.c:616 [inline] __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x48b/0x880 drivers/base/dd.c:1372 bus_remove_device+0x444/0x560 drivers/base/bus.c:667 device_del+0x524/0x8f0 drivers/base/core.c:3965 device_unregister+0x21/0xf0 drivers/base/core.c:4006 nsim_bus_dev_del drivers/net/netdevsim/bus.c:488 [inline] del_device_store+0x2b5/0x370 drivers/net/netdevsim/bus.c:243 kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe6aee8cd77 Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffe6a26c3a0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000055555df6c400 RCX: 00007fe6aee8cd77 RDX: 0000000000000001 RSI: 00007fe6aeeca627 RDI: 0000000000000003 RBP: 0000000000000018 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007fe6aeeca627 R13: 00007ffe6a26c760 R14: 0000000000000004 R15: 00007ffe6a26c414 --- 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@googlegroups.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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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