linux-kernel - Re: memory leak in hub

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Date:   Mon, 23 Nov 2020 10:44:06 -0800
From:   syzbot <syzbot+44e64397bd81d5e84cba@...kaller.appspotmail.com>
To:     andreyknvl@...gle.com, balbi@...nel.org,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, stern@...land.harvard.edu,
        syzkaller-bugs@...glegroups.com
Subject: Re: memory leak in hub_event

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
memory leak in rxrpc_lookup_local

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
BUG: memory leak
unreferenced object 0xffff888117824d00 (size 256):
  comm "syz-executor.6", pid 8896, jiffies 4294943994 (age 432.900s)
  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 ad 17 81 88 ff ff  ................
  backtrace:
    [<0000000069b066ee>] kmalloc include/linux/slab.h:552 [inline]
    [<0000000069b066ee>] kzalloc include/linux/slab.h:664 [inline]
    [<0000000069b066ee>] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
    [<0000000069b066ee>] rxrpc_lookup_local+0x1c1/0x760 net/rxrpc/local_object.c:244
    [<0000000085db7132>] rxrpc_bind+0x174/0x240 net/rxrpc/af_rxrpc.c:149
    [<00000000a2a77c59>] afs_open_socket+0xdb/0x200 fs/afs/rxrpc.c:64
    [<0000000086f4a248>] afs_net_init+0x2b4/0x340 fs/afs/main.c:126
    [<00000000fafe7caa>] ops_init+0x4e/0x190 net/core/net_namespace.c:152
    [<00000000c3d26710>] setup_net+0xdb/0x2d0 net/core/net_namespace.c:342
    [<000000001d81d993>] copy_net_ns+0x14b/0x320 net/core/net_namespace.c:483
    [<0000000058b54b80>] create_new_namespaces+0x199/0x4e0 kernel/nsproxy.c:110
    [<00000000cd2a2042>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:231
    [<00000000f7907f96>] ksys_unshare+0x2fe/0x5c0 kernel/fork.c:2949
    [<0000000050cbc28c>] __do_sys_unshare kernel/fork.c:3017 [inline]
    [<0000000050cbc28c>] __se_sys_unshare kernel/fork.c:3015 [inline]
    [<0000000050cbc28c>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3015
    [<00000000ade5a609>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<000000003424d3b0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff8881182a6700 (size 256):
  comm "syz-executor.2", pid 8885, jiffies 4294943999 (age 432.850s)
  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 b7 16 81 88 ff ff  ................
  backtrace:
    [<0000000069b066ee>] kmalloc include/linux/slab.h:552 [inline]
    [<0000000069b066ee>] kzalloc include/linux/slab.h:664 [inline]
    [<0000000069b066ee>] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
    [<0000000069b066ee>] rxrpc_lookup_local+0x1c1/0x760 net/rxrpc/local_object.c:244
    [<0000000085db7132>] rxrpc_bind+0x174/0x240 net/rxrpc/af_rxrpc.c:149
    [<00000000a2a77c59>] afs_open_socket+0xdb/0x200 fs/afs/rxrpc.c:64
    [<0000000086f4a248>] afs_net_init+0x2b4/0x340 fs/afs/main.c:126
    [<00000000fafe7caa>] ops_init+0x4e/0x190 net/core/net_namespace.c:152
    [<00000000c3d26710>] setup_net+0xdb/0x2d0 net/core/net_namespace.c:342
    [<000000001d81d993>] copy_net_ns+0x14b/0x320 net/core/net_namespace.c:483
    [<0000000058b54b80>] create_new_namespaces+0x199/0x4e0 kernel/nsproxy.c:110
    [<00000000cd2a2042>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:231
    [<00000000f7907f96>] ksys_unshare+0x2fe/0x5c0 kernel/fork.c:2949
    [<0000000050cbc28c>] __do_sys_unshare kernel/fork.c:3017 [inline]
    [<0000000050cbc28c>] __se_sys_unshare kernel/fork.c:3015 [inline]
    [<0000000050cbc28c>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3015
    [<00000000ade5a609>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<000000003424d3b0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff888118395100 (size 256):
  comm "syz-executor.4", pid 8892, jiffies 4294944000 (age 432.840s)
  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 8b 17 81 88 ff ff  ................
  backtrace:
    [<0000000069b066ee>] kmalloc include/linux/slab.h:552 [inline]
    [<0000000069b066ee>] kzalloc include/linux/slab.h:664 [inline]
    [<0000000069b066ee>] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
    [<0000000069b066ee>] rxrpc_lookup_local+0x1c1/0x760 net/rxrpc/local_object.c:244
    [<0000000085db7132>] rxrpc_bind+0x174/0x240 net/rxrpc/af_rxrpc.c:149
    [<00000000a2a77c59>] afs_open_socket+0xdb/0x200 fs/afs/rxrpc.c:64
    [<0000000086f4a248>] afs_net_init+0x2b4/0x340 fs/afs/main.c:126
    [<00000000fafe7caa>] ops_init+0x4e/0x190 net/core/net_namespace.c:152
    [<00000000c3d26710>] setup_net+0xdb/0x2d0 net/core/net_namespace.c:342
    [<000000001d81d993>] copy_net_ns+0x14b/0x320 net/core/net_namespace.c:483
    [<0000000058b54b80>] create_new_namespaces+0x199/0x4e0 kernel/nsproxy.c:110
    [<00000000cd2a2042>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:231
    [<00000000f7907f96>] ksys_unshare+0x2fe/0x5c0 kernel/fork.c:2949
    [<0000000050cbc28c>] __do_sys_unshare kernel/fork.c:3017 [inline]
    [<0000000050cbc28c>] __se_sys_unshare kernel/fork.c:3015 [inline]
    [<0000000050cbc28c>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3015
    [<00000000ade5a609>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<000000003424d3b0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff8881116e0f00 (size 256):
  comm "syz-executor.7", pid 8894, jiffies 4294944002 (age 432.820s)
  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 b9 17 81 88 ff ff  ................
  backtrace:
    [<0000000069b066ee>] kmalloc include/linux/slab.h:552 [inline]
    [<0000000069b066ee>] kzalloc include/linux/slab.h:664 [inline]
    [<0000000069b066ee>] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
    [<0000000069b066ee>] rxrpc_lookup_local+0x1c1/0x760 net/rxrpc/local_object.c:244
    [<0000000085db7132>] rxrpc_bind+0x174/0x240 net/rxrpc/af_rxrpc.c:149
    [<00000000a2a77c59>] afs_open_socket+0xdb/0x200 fs/afs/rxrpc.c:64
    [<0000000086f4a248>] afs_net_init+0x2b4/0x340 fs/afs/main.c:126
    [<00000000fafe7caa>] ops_init+0x4e/0x190 net/core/net_namespace.c:152
    [<00000000c3d26710>] setup_net+0xdb/0x2d0 net/core/net_namespace.c:342
    [<000000001d81d993>] copy_net_ns+0x14b/0x320 net/core/net_namespace.c:483
    [<0000000058b54b80>] create_new_namespaces+0x199/0x4e0 kernel/nsproxy.c:110
    [<00000000cd2a2042>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:231
    [<00000000f7907f96>] ksys_unshare+0x2fe/0x5c0 kernel/fork.c:2949
    [<0000000050cbc28c>] __do_sys_unshare kernel/fork.c:3017 [inline]
    [<0000000050cbc28c>] __se_sys_unshare kernel/fork.c:3015 [inline]
    [<0000000050cbc28c>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3015
    [<00000000ade5a609>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<000000003424d3b0>] 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=134bda0d500000
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=10d4463e500000