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As the mention in commmitf7452a7e96("RDMA/rtrs-srv: fix memory leak by missing kobject free"), it was intended to remove the kobject_del for srv_path->kobj.f7452a7e96said: >This patch moves kobject_del() into free_sess() so that the kobject of > rtrs_srv_sess can be freed. This patch also move rtrs_srv_destroy_once_sysfs_root_folders back to 'if (srv_path->kobj.state_in_sysfs)' block to avoid a 'held lock freed!' A kernel panic will be triggered by following script ----------------------- $ while true do echo "sessname=foo path=ip:<ip address> device_path=/dev/nvme0n1" > /sys/devices/virtual/rnbd-client/ctl/map_device echo "normal" > /sys/block/rnbd0/rnbd/unmap_device done ----------------------- The bisection pointed to commit6af4609c18("RDMA/rtrs-srv: Fix several issues in rtrs_srv_destroy_path_files") at last. rnbd_server L777: </dev/nvme0n1@foo>: Opened device 'nvme0n1' general protection fault, probably for non-canonical address 0x765f766564753aea: 0000 [#1] PREEMPT SMP PTI CPU: 0 PID: 3558 Comm: systemd-udevd Kdump: loaded Not tainted 6.1.0-rc3-roce-flush+ #51 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 RIP: 0010:kernfs_dop_revalidate+0x36/0x180 Code: 00 00 41 55 41 54 55 53 48 8b 47 68 48 89 fb 48 85 c0 0f 84 db 00 00 00 48 8b a8 60 04 00 00 48 8b 45 30 48 85 c0 48 0f 44 c5 <4c> 8b 60 78 49 81 c4 d8 00 00 00 4c 89 e7 e8 b7 78 7b 00 8b 05 3d RSP: 0018:ffffaf1700b67c78 EFLAGS: 00010206 RAX: 765f766564753a72 RBX: ffff89e2830849c0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff89e2830849c0 RBP: ffff89e280361bd0 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000065 R11: 0000000000000000 R12: ffff89e2830849c0 R13: ffff89e283084888 R14: d0d0d0d0d0d0d0d0 R15: 2f2f2f2f2f2f2f2f FS: 00007f13fbce7b40(0000) GS:ffff89e2bbc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f93e055d340 CR3: 0000000104664002 CR4: 00000000001706f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> lookup_fast+0x7b/0x100 walk_component+0x21/0x160 link_path_walk.part.0+0x24d/0x390 path_openat+0xad/0x9a0 do_filp_open+0xa9/0x150 ? lock_release+0x13c/0x2e0 ? _raw_spin_unlock+0x29/0x50 ? alloc_fd+0x124/0x1f0 do_sys_openat2+0x9b/0x160 __x64_sys_openat+0x54/0xa0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f13fc9d701b Code: 25 00 00 41 00 3d 00 00 41 00 74 4b 64 8b 04 25 18 00 00 00 85 c0 75 67 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 91 00 00 00 48 8b 54 24 28 64 48 2b 14 25 RSP: 002b:00007ffddf242640 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f13fc9d701b RDX: 0000000000080000 RSI: 00007ffddf2427c0 RDI: 00000000ffffff9c RBP: 00007ffddf2427c0 R08: 00007f13fcc5b440 R09: 21b2131aa64b1ef2 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000080000 R13: 00007ffddf2427c0 R14: 000055ed13be8db0 R15: 0000000000000000 Fixes:6af4609c18("RDMA/rtrs-srv: Fix several issues in rtrs_srv_destroy_path_files") Acked-by: Guoqing Jiang <guoqing.jiang@linux.dev> Signed-off-by: Li Zhijian <lizhijian@fujitsu.com> Link: https://lore.kernel.org/r/1675332721-2-1-git-send-email-lizhijian@fujitsu.com Acked-by: Jack Wang <jinpu.wang@ionos.com> Signed-off-by: Leon Romanovsky <leon@kernel.org>
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.