On Fri, 2017-04-07 at 21:56 +0300, Michael S. Tsirkin wrote: > OK. test3 and test4 are now pushed: test3 should fix your hang, > test4 is trying to fix a crash reported independently.
test3 does not fix the post hibernate hang business that I can easily reproduce, those are NFS, and at least as old as 4.4. Host/guest, dunno, put 4.4 on both, guest hangs intermittently. [<ffffffffa039a550>] __rpc_wait_for_completion_task+0x30/0x30 [sunrpc] [<ffffffffa039a56e>] rpc_wait_bit_killable+0x1e/0xb0 [sunrpc] [<ffffffffa039a550>] __rpc_wait_for_completion_task+0x30/0x30 [sunrpc] [<ffffffff810c6450>] autoremove_wake_function+0x50/0x50 [<ffffffffa038f670>] call_decode+0x850/0x850 [sunrpc] [<ffffffffa038f670>] call_decode+0x850/0x850 [sunrpc] [<ffffffffa039b17e>] __rpc_execute+0x14e/0x440 [sunrpc] [<ffffffff810f7d35>] ktime_get+0x35/0xa0 [<ffffffffa0390900>] rpc_run_task+0x120/0x170 [sunrpc] [<ffffffffa064a1c6>] nfs4_call_sync_sequence+0x56/0x80 [nfsv4] [<ffffffffa064acd0>] _nfs4_proc_getattr+0xb0/0xc0 [nfsv4] [<ffffffff8123f8b2>] path_lookupat+0xd2/0x100 [<ffffffffa0655d9c>] nfs4_proc_getattr+0x5c/0xe0 [nfsv4] [<ffffffffa0612120>] __nfs_revalidate_inode+0xa0/0x300 [nfs] [<ffffffffa0612485>] nfs_getattr+0x95/0x250 [nfs] [<ffffffff812365eb>] vfs_statx+0x7b/0xc0 [<ffffffff81236a60>] SYSC_newstat+0x20/0x40 [<ffffffff81687177>] entry_SYSCALL_64_fastpath+0x1a/0xa9 [<ffffffffffffffff>] 0xffffffffffffffff I noted no _other_ misbehavior in either kernel, w/wo threadirqs. -Mike