syzbot


WARNING: refcount bug in netdev_queue_release

Status: closed as invalid on 2021/12/14 20:02
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 388d, last: 373d

Sample crash report:
bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
------------[ cut here ]------------
refcount_t: decrement hit 0; leaking memory.
WARNING: CPU: 0 PID: 1092 at lib/refcount.c:31 refcount_warn_saturate+0xbf/0x1e0 lib/refcount.c:31
Modules linked in:
CPU: 0 PID: 1092 Comm: kworker/u4:5 Not tainted 5.16.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:refcount_warn_saturate+0xbf/0x1e0 lib/refcount.c:31
Code: 1d d4 da a1 09 31 ff 89 de e8 dd 4a 9c fd 84 db 75 e0 e8 f4 46 9c fd 48 c7 c7 e0 4c 04 8a c6 05 b4 da a1 09 01 e8 e5 ae 25 05 <0f> 0b eb c4 e8 d8 46 9c fd 0f b6 1d a3 da a1 09 31 ff 89 de e8 a8
RSP: 0018:ffffc90004c47910 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801cf18080 RSI: ffffffff815e40a8 RDI: fffff52000988f14
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815dde4e R11: 0000000000000000 R12: ffff88807d3745b0
R13: 0000000000000002 R14: ffff88807f59c6c0 R15: ffff88801f7e5c50
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f95e2523000 CR3: 0000000024650000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_dec include/linux/refcount.h:344 [inline]
 refcount_dec include/linux/refcount.h:359 [inline]
 dev_put include/linux/netdevice.h:4166 [inline]
 netdev_queue_release+0x91/0xa0 net/core/net-sysfs.c:1622
 kobject_cleanup lib/kobject.c:705 [inline]
 kobject_release lib/kobject.c:736 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1c8/0x540 lib/kobject.c:753
 netdev_queue_update_kobjects+0x310/0x460 net/core/net-sysfs.c:1725
 remove_queue_kobjects net/core/net-sysfs.c:1822 [inline]
 netdev_unregister_kobject+0x15b/0x1f0 net/core/net-sysfs.c:1972
 unregister_netdevice_many+0xd1f/0x1790 net/core/dev.c:11104
 default_device_exit_batch+0x2fa/0x3c0 net/core/dev.c:11607
 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Crashes (5):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-selinux-root 2021/11/25 02:37 upstream 5f53fa508db0 545ab074 .config log report info WARNING: refcount bug in netdev_queue_release
ci-qemu-upstream 2021/11/19 12:31 upstream 4c388a8e740d 31a30fc0 .config log report info WARNING: refcount bug in netdev_queue_release
ci-upstream-net-this-kasan-gce 2021/11/09 20:46 net 0b9111922b1f 59bcaf9a .config log report info WARNING: refcount bug in netdev_queue_release
ci-upstream-net-kasan-gce 2021/11/14 10:24 net-next 66f4beaa6c1d 83f5c9b5 .config log report info WARNING: refcount bug in netdev_queue_release
ci-upstream-net-kasan-gce 2021/11/14 03:09 net-next 66f4beaa6c1d 83f5c9b5 .config log report info WARNING: refcount bug in netdev_queue_release
* Struck through repros no longer work on HEAD.