nbd: Reclassify sockets to avoid lockdep circular dependency#959
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nbd: Reclassify sockets to avoid lockdep circular dependency#959blktests-ci[bot] wants to merge 1 commit into
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syzbot reported a possible circular locking dependency in udp_sendmsg() where fs_reclaim can be triggered while holding sk_lock, and fs_reclaim can eventually depend on another sk_lock (e.g., if NBD is used for swap or writeback and NBD uses TLS/TCP which acquires sk_lock). Since the UDP socket and the NBD TCP/TLS socket are different, this is a false positive. Fix this by reclassifying NBD sockets to a separate lock class when they are added to the NBD device. This is similar to what nvme-tcp and other network block devices do. Fixes: ffa1e7a ("block: Make request_queue lockdep splats show up earlier") Reported-by: syzbot+607cdcf978b3e79da878@syzkaller.appspotmail.com Closes: https://lore.kernel.org/netdev/6a2cdafe.428ffe26.258b27.0161.GAE@google.com/T/#u Signed-off-by: Eric Dumazet <edumazet@google.com>
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Pull request for series with
subject: nbd: Reclassify sockets to avoid lockdep circular dependency
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1110973