These patches fix some issues with the notifier blocks used by nfsd and
lockd. The first two patches initialize the scope id for link local
addresses (this is needed because rpc_cmp_addr6 looks at it when
comparing link local addresses). The third patch fixes the illegal
context switch warnings such as the following:
Jan 04 16:27:20 fedora25 kernel: ===============================
Jan 04 16:27:20 fedora25 kernel: [ INFO: suspicious RCU usage. ]
Jan 04 16:27:20 fedora25 kernel: 4.10.0-rc2+ #9 Not tainted
Jan 04 16:27:20 fedora25 kernel: -------------------------------
Jan 04 16:27:20 fedora25 kernel: ./include/linux/rcupdate.h:557 Illegal context switch in RCU read-side critical section!
Jan 04 16:27:20 fedora25 kernel:
other info that might help us debug this:
Jan 04 16:27:20 fedora25 kernel:
rcu_scheduler_active = 1, debug_locks = 1
Jan 04 16:27:20 fedora25 kernel: 2 locks held by ip/1281:
Jan 04 16:27:20 fedora25 kernel: #0: (rtnl_mutex){+.+.+.}, at: [<ffffffff977abd6b>] rtnetlink_rcv+0x1b/0x40
Jan 04 16:27:20 fedora25 kernel: #1: (rcu_read_lock){......}, at: [<ffffffff970d76c5>] atomic_notifier_call_chain+0x5/0x100
Jan 04 16:27:20 fedora25 kernel:
stack backtrace:
Jan 04 16:27:20 fedora25 kernel: CPU: 3 PID: 1281 Comm: ip Not tainted 4.10.0-rc2+ #9
Jan 04 16:27:20 fedora25 kernel: Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-1.fc24 04/01/2014
Jan 04 16:27:20 fedora25 kernel: Call Trace:
Jan 04 16:27:20 fedora25 kernel: dump_stack+0x86/0xc3
Jan 04 16:27:20 fedora25 kernel: lockdep_rcu_suspicious+0xc5/0x100
Jan 04 16:27:20 fedora25 kernel: __schedule+0x4a8/0xab0
Jan 04 16:27:20 fedora25 kernel: ? irq_work_queue+0x8d/0xa0
Jan 04 16:27:20 fedora25 kernel: _cond_resched+0x2b/0x40
Jan 04 16:27:20 fedora25 kernel: lock_sock_nested+0x24/0xa0
Jan 04 16:27:20 fedora25 kernel: sock_setsockopt+0x8b/0xac0
Jan 04 16:27:20 fedora25 kernel: ? __local_bh_enable_ip+0x70/0xc0
Jan 04 16:27:20 fedora25 kernel: kernel_setsockopt+0x49/0x50
Jan 04 16:27:20 fedora25 kernel: svc_tcp_kill_temp_xprt+0x4a/0x60 [sunrpc]
Jan 04 16:27:20 fedora25 kernel: svc_age_temp_xprts_now+0x186/0x210 [sunrpc]
Jan 04 16:27:20 fedora25 kernel: nfsd_inet6addr_event+0x1a5/0x200 [nfsd]
Jan 04 16:27:20 fedora25 kernel: ? nfsd_inet6addr_event+0x5/0x200 [nfsd]
Jan 04 16:27:20 fedora25 kernel: notifier_call_chain+0x4a/0x70
Jan 04 16:27:20 fedora25 kernel: atomic_notifier_call_chain+0x67/0x100
Jan 04 16:27:20 fedora25 kernel: ? atomic_notifier_call_chain+0x5/0x100
Jan 04 16:27:20 fedora25 kernel: inet6addr_notifier_call_chain+0x1b/0x20
Jan 04 16:27:20 fedora25 kernel: ipv6_del_addr+0x145/0x250
Jan 04 16:27:20 fedora25 kernel: inet6_addr_del+0xf1/0x1b0
Jan 04 16:27:20 fedora25 kernel: inet6_rtm_deladdr+0xa9/0xc0
Jan 04 16:27:20 fedora25 kernel: rtnetlink_rcv_msg+0xe6/0x210
Jan 04 16:27:20 fedora25 kernel: ? debug_lockdep_rcu_enabled+0x1d/0x20
Jan 04 16:27:20 fedora25 kernel: ? rtnl_newlink+0x860/0x860
Jan 04 16:27:20 fedora25 kernel: netlink_rcv_skb+0xa4/0xc0
Jan 04 16:27:20 fedora25 kernel: rtnetlink_rcv+0x2a/0x40
Jan 04 16:27:20 fedora25 kernel: netlink_unicast+0x1e5/0x2e0
Jan 04 16:27:20 fedora25 kernel: ? netlink_unicast+0x16f/0x2e0
Jan 04 16:27:20 fedora25 kernel: netlink_sendmsg+0x2fe/0x3b0
Jan 04 16:27:20 fedora25 kernel: sock_sendmsg+0x38/0x50
Jan 04 16:27:20 fedora25 kernel: ___sys_sendmsg+0x2e0/0x2f0
Jan 04 16:27:20 fedora25 kernel: ? trace_hardirqs_on_caller+0xf5/0x1b0
Jan 04 16:27:20 fedora25 kernel: ? _raw_spin_unlock+0x27/0x30
Jan 04 16:27:20 fedora25 kernel: ? handle_mm_fault+0x6b5/0x15f0
Jan 04 16:27:20 fedora25 kernel: ? handle_mm_fault+0x4f/0x15f0
Jan 04 16:27:20 fedora25 kernel: ? debug_lockdep_rcu_enabled+0x1d/0x20
Jan 04 16:27:20 fedora25 kernel: __sys_sendmsg+0x54/0x90
Jan 04 16:27:20 fedora25 kernel: SyS_sendmsg+0x12/0x20
Jan 04 16:27:20 fedora25 kernel: entry_SYSCALL_64_fastpath+0x1f/0xc2
Jan 04 16:27:20 fedora25 kernel: RIP: 0033:0x7f8fd55e6037
Jan 04 16:27:20 fedora25 kernel: RSP: 002b:00007ffc7f1a7558 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
Jan 04 16:27:20 fedora25 kernel: RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8fd55e6037
Jan 04 16:27:20 fedora25 kernel: RDX: 0000000000000000 RSI: 00007ffc7f1a75a0 RDI: 0000000000000003
Jan 04 16:27:20 fedora25 kernel: RBP: 00007ffc7f1a75a0 R08: 0000000000000400 R09: fefefeff77686d74
Jan 04 16:27:20 fedora25 kernel: R10: 00000000000005eb R11: 0000000000000246 R12: 0000000000000000
Jan 04 16:27:20 fedora25 kernel: R13: 000000000065d3a0 R14: 00007ffc7f1af6e0 R15: 00007ffc7f1af6e8
Scott Mayhew (3):
nfsd: initialize sin6_scope_id in nfsd_inet6addr_event()
lockd: initialize sin6_scope_id in lockd_inet6addr_event()
sunrpc: don't call sleeping functions from the notifier block
callbacks
fs/lockd/svc.c | 2 ++
fs/nfsd/nfssvc.c | 2 ++
include/linux/sunrpc/svc_xprt.h | 1 +
net/sunrpc/svc_xprt.c | 10 +++++++---
4 files changed, 12 insertions(+), 3 deletions(-)
--
2.7.4
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