bond0 (unregistering): (slave bond_slave_1): Releasing backup interface bond0 (unregistering): (slave bond_slave_0): Releasing backup interface bond0 (unregistering): Released all slaves BUG: kernel NULL pointer dereference, address: 000000000000009c #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] SMP CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.10.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:afs_unuse_cell+0x67/0x780 fs/afs/cell.c:592 Code: 4d 8b 6f 08 45 8b a7 88 0c 00 00 41 8b 87 90 0c 00 00 89 45 d4 e8 b9 d7 78 fd 49 8d 9e 9c 00 00 00 4d 85 ed 0f 85 30 04 00 00 <41> 8b 86 9c 00 00 00 89 45 8c 48 89 df e8 a7 f8 f7 fd 8b 18 8b 0a RSP: 0018:ffff888102c9fa38 EFLAGS: 00010246 RAX: ffffffff843e3717 RBX: 000000000000009c RCX: ffff888102c1dc40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881255a0800 RBP: ffff888102c9fac0 R08: ffffea000000000f R09: ffff88813fffa000 R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff888102c1e640 FS: 0000000000000000(0000) GS:ffff88813fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000000009c CR3: 0000000112ac5000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: afs_cell_purge+0xfb/0x5e0 fs/afs/cell.c:951 afs_net_exit+0xc6/0x180 fs/afs/main.c:156 ops_exit_list net/core/net_namespace.c:187 [inline] cleanup_net+0xd73/0x1af0 net/core/net_namespace.c:604 process_one_work+0x121c/0x1fc0 kernel/workqueue.c:2272 worker_thread+0x10cc/0x2740 kernel/workqueue.c:2418 kthread+0x51c/0x560 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Modules linked in: CR2: 000000000000009c ---[ end trace ce70e2fe313b4f87 ]--- RIP: 0010:afs_unuse_cell+0x67/0x780 fs/afs/cell.c:592 Code: 4d 8b 6f 08 45 8b a7 88 0c 00 00 41 8b 87 90 0c 00 00 89 45 d4 e8 b9 d7 78 fd 49 8d 9e 9c 00 00 00 4d 85 ed 0f 85 30 04 00 00 <41> 8b 86 9c 00 00 00 89 45 8c 48 89 df e8 a7 f8 f7 fd 8b 18 8b 0a RSP: 0018:ffff888102c9fa38 EFLAGS: 00010246 RAX: ffffffff843e3717 RBX: 000000000000009c RCX: ffff888102c1dc40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881255a0800 RBP: ffff888102c9fac0 R08: ffffea000000000f R09: ffff88813fffa000 R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff888102c1e640 FS: 0000000000000000(0000) GS:ffff88813fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000000009c CR3: 0000000112ac5000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400