Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
memory leak in rxrpc_lookup_local
BUG: memory leak
unreferenced object 0xffff888117ab9900 (size 256):
comm "syz-executor.0", pid 8883, jiffies 4294943811 (age 433.620s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 0a 00 00 00 00 80 cb 17 81 88 ff ff ................
backtrace:
[<000000009003383a>] kmalloc include/linux/slab.h:552 [inline]
[<000000009003383a>] kzalloc include/linux/slab.h:664 [inline]
[<000000009003383a>] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
[<000000009003383a>] rxrpc_lookup_local+0x1c1/0x760 net/rxrpc/local_object.c:244
[<00000000609410d3>] rxrpc_bind+0x174/0x240 net/rxrpc/af_rxrpc.c:149
[<00000000661f73ad>] afs_open_socket+0xdb/0x200 fs/afs/rxrpc.c:64
[<00000000e3eb5768>] afs_net_init+0x2b4/0x340 fs/afs/main.c:126
[<000000002c6bf109>] ops_init+0x4e/0x190 net/core/net_namespace.c:152
[<000000009ce0aa62>] setup_net+0xdb/0x2d0 net/core/net_namespace.c:342
[<00000000db8c8dc2>] copy_net_ns+0x14b/0x320 net/core/net_namespace.c:483
[<00000000b04b70a8>] create_new_namespaces+0x199/0x4e0 kernel/nsproxy.c:110
[<000000005dc01eb8>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:231
[<00000000422ec6bd>] ksys_unshare+0x2fe/0x5c0 kernel/fork.c:2949
[<0000000042f77bee>] __do_sys_unshare kernel/fork.c:3017 [inline]
[<0000000042f77bee>] __se_sys_unshare kernel/fork.c:3015 [inline]
[<0000000042f77bee>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3015
[<00000000e58e69f9>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
[<000000000a67195e>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: memory leak
unreferenced object 0xffff888117d40d00 (size 256):
comm "syz-executor.1", pid 8884, jiffies 4294943812 (age 433.610s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 0a 00 00 00 00 c0 ac 17 81 88 ff ff ................
backtrace:
[<000000009003383a>] kmalloc include/linux/slab.h:552 [inline]
[<000000009003383a>] kzalloc include/linux/slab.h:664 [inline]
[<000000009003383a>] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
[<000000009003383a>] rxrpc_lookup_local+0x1c1/0x760 net/rxrpc/local_object.c:244
[<00000000609410d3>] rxrpc_bind+0x174/0x240 net/rxrpc/af_rxrpc.c:149
[<00000000661f73ad>] afs_open_socket+0xdb/0x200 fs/afs/rxrpc.c:64
[<00000000e3eb5768>] afs_net_init+0x2b4/0x340 fs/afs/main.c:126
[<000000002c6bf109>] ops_init+0x4e/0x190 net/core/net_namespace.c:152
[<000000009ce0aa62>] setup_net+0xdb/0x2d0 net/core/net_namespace.c:342
[<00000000db8c8dc2>] copy_net_ns+0x14b/0x320 net/core/net_namespace.c:483
[<00000000b04b70a8>] create_new_namespaces+0x199/0x4e0 kernel/nsproxy.c:110
[<000000005dc01eb8>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:231
[<00000000422ec6bd>] ksys_unshare+0x2fe/0x5c0 kernel/fork.c:2949
[<0000000042f77bee>] __do_sys_unshare kernel/fork.c:3017 [inline]
[<0000000042f77bee>] __se_sys_unshare kernel/fork.c:3015 [inline]
[<0000000042f77bee>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3015
[<00000000e58e69f9>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
[<000000000a67195e>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: memory leak
unreferenced object 0xffff888118236900 (size 256):
comm "syz-executor.2", pid 8894, jiffies 4294943830 (age 433.430s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 0a 00 00 00 00 00 34 18 81 88 ff ff ..........4.....
backtrace:
[<000000009003383a>] kmalloc include/linux/slab.h:552 [inline]
[<000000009003383a>] kzalloc include/linux/slab.h:664 [inline]
[<000000009003383a>] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
[<000000009003383a>] rxrpc_lookup_local+0x1c1/0x760 net/rxrpc/local_object.c:244
[<00000000609410d3>] rxrpc_bind+0x174/0x240 net/rxrpc/af_rxrpc.c:149
[<00000000661f73ad>] afs_open_socket+0xdb/0x200 fs/afs/rxrpc.c:64
[<00000000e3eb5768>] afs_net_init+0x2b4/0x340 fs/afs/main.c:126
[<000000002c6bf109>] ops_init+0x4e/0x190 net/core/net_namespace.c:152
[<000000009ce0aa62>] setup_net+0xdb/0x2d0 net/core/net_namespace.c:342
[<00000000db8c8dc2>] copy_net_ns+0x14b/0x320 net/core/net_namespace.c:483
[<00000000b04b70a8>] create_new_namespaces+0x199/0x4e0 kernel/nsproxy.c:110
[<000000005dc01eb8>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:231
[<00000000422ec6bd>] ksys_unshare+0x2fe/0x5c0 kernel/fork.c:2949
[<0000000042f77bee>] __do_sys_unshare kernel/fork.c:3017 [inline]
[<0000000042f77bee>] __se_sys_unshare kernel/fork.c:3015 [inline]
[<0000000042f77bee>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3015
[<00000000e58e69f9>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
[<000000000a67195e>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: memory leak
unreferenced object 0xffff8881170d5400 (size 256):
comm "syz-executor.3", pid 8888, jiffies 4294943833 (age 433.400s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 0a 00 00 00 00 40 35 18 81 88 ff ff .........@5.....
backtrace:
[<000000009003383a>] kmalloc include/linux/slab.h:552 [inline]
[<000000009003383a>] kzalloc include/linux/slab.h:664 [inline]
[<000000009003383a>] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
[<000000009003383a>] rxrpc_lookup_local+0x1c1/0x760 net/rxrpc/local_object.c:244
[<00000000609410d3>] rxrpc_bind+0x174/0x240 net/rxrpc/af_rxrpc.c:149
[<00000000661f73ad>] afs_open_socket+0xdb/0x200 fs/afs/rxrpc.c:64
[<00000000e3eb5768>] afs_net_init+0x2b4/0x340 fs/afs/main.c:126
[<000000002c6bf109>] ops_init+0x4e/0x190 net/core/net_namespace.c:152
[<000000009ce0aa62>] setup_net+0xdb/0x2d0 net/core/net_namespace.c:342
[<00000000db8c8dc2>] copy_net_ns+0x14b/0x320 net/core/net_namespace.c:483
[<00000000b04b70a8>] create_new_namespaces+0x199/0x4e0 kernel/nsproxy.c:110
[<000000005dc01eb8>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:231
[<00000000422ec6bd>] ksys_unshare+0x2fe/0x5c0 kernel/fork.c:2949
[<0000000042f77bee>] __do_sys_unshare kernel/fork.c:3017 [inline]
[<0000000042f77bee>] __se_sys_unshare kernel/fork.c:3015 [inline]
[<0000000042f77bee>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3015
[<00000000e58e69f9>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
[<000000000a67195e>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
Tested on:
commit: 4d02da97 Merge tag 'net-5.10-rc5' of git://git.kernel.org/..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=123a6611500000
kernel config: https://syzkaller.appspot.com/x/.config?x=b29e92cdfa2687df
dashboard link: https://syzkaller.appspot.com/bug?extid=44e64397bd81d5e84cba
compiler: gcc (GCC) 10.1.0-syz 20200507
patch: https://syzkaller.appspot.com/x/patch.diff?x=11c4e969500000
