f30bbc3870
The following commit reverted the changes to ref count the server struct while scheduling a reconnect work: 823342524868 Revert "cifs: reconnect work should have reference on server struct" However, a following change also introduced scheduling of reconnect work, and assumed ref counting. This change fixes that as well. Fixes umount problems like: [73496.157838] CPU: 5 PID: 1321389 Comm: umount Tainted: G W OE 6.7.0-060700rc6-generic #202312172332 [73496.157841] Hardware name: LENOVO 20MAS08500/20MAS08500, BIOS N2CET67W (1.50 ) 12/15/2022 [73496.157843] RIP: 0010:cifs_put_tcp_session+0x17d/0x190 [cifs] [73496.157906] Code: 5d 31 c0 31 d2 31 f6 31 ff c3 cc cc cc cc e8 4a 6e 14 e6 e9 f6 fe ff ff be 03 00 00 00 48 89 d7 e8 78 26 b3 e5 e9 e4 fe ff ff <0f> 0b e9 b1 fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 [73496.157908] RSP: 0018:ffffc90003bcbcb8 EFLAGS: 00010286 [73496.157911] RAX: 00000000ffffffff RBX: ffff8885830fa800 RCX: 0000000000000000 [73496.157913] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [73496.157915] RBP: ffffc90003bcbcc8 R08: 0000000000000000 R09: 0000000000000000 [73496.157917] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [73496.157918] R13: ffff8887d56ba800 R14: 00000000ffffffff R15: ffff8885830fa800 [73496.157920] FS: 00007f1ff0e33800(0000) GS:ffff88887ba80000(0000) knlGS:0000000000000000 [73496.157922] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [73496.157924] CR2: 0000115f002e2010 CR3: 00000003d1e24005 CR4: 00000000003706f0 [73496.157926] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [73496.157928] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [73496.157929] Call Trace: [73496.157931] <TASK> [73496.157933] ? show_regs+0x6d/0x80 [73496.157936] ? __warn+0x89/0x160 [73496.157939] ? cifs_put_tcp_session+0x17d/0x190 [cifs] [73496.157976] ? report_bug+0x17e/0x1b0 [73496.157980] ? handle_bug+0x51/0xa0 [73496.157983] ? exc_invalid_op+0x18/0x80 [73496.157985] ? asm_exc_invalid_op+0x1b/0x20 [73496.157989] ? cifs_put_tcp_session+0x17d/0x190 [cifs] [73496.158023] ? cifs_put_tcp_session+0x1e/0x190 [cifs] [73496.158057] __cifs_put_smb_ses+0x2b5/0x540 [cifs] [73496.158090] ? tconInfoFree+0xc2/0x120 [cifs] [73496.158130] cifs_put_tcon.part.0+0x108/0x2b0 [cifs] [73496.158173] cifs_put_tlink+0x49/0x90 [cifs] [73496.158220] cifs_umount+0x56/0xb0 [cifs] [73496.158258] cifs_kill_sb+0x52/0x60 [cifs] [73496.158306] deactivate_locked_super+0x32/0xc0 [73496.158309] deactivate_super+0x46/0x60 [73496.158311] cleanup_mnt+0xc3/0x170 [73496.158314] __cleanup_mnt+0x12/0x20 [73496.158330] task_work_run+0x5e/0xa0 [73496.158333] exit_to_user_mode_loop+0x105/0x130 [73496.158336] exit_to_user_mode_prepare+0xa5/0xb0 [73496.158338] syscall_exit_to_user_mode+0x29/0x60 [73496.158341] do_syscall_64+0x6c/0xf0 [73496.158344] ? syscall_exit_to_user_mode+0x37/0x60 [73496.158346] ? do_syscall_64+0x6c/0xf0 [73496.158349] ? exit_to_user_mode_prepare+0x30/0xb0 [73496.158353] ? syscall_exit_to_user_mode+0x37/0x60 [73496.158355] ? do_syscall_64+0x6c/0xf0 Reported-by: Robert Morris <rtm@csail.mit.edu> Fixes: 705fc522fe9d ("cifs: handle when server starts supporting multichannel") Signed-off-by: Shyam Prasad N <sprasad@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.