mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity
linux-stable/kernel/rcu
History
Qiuxu Zhuo 1dd7547c76 rcu/rcuscale: Stop kfree_scale_thread thread(s) after unloading rcuscale 
[ Upstream commit 23fc8df26d ]

Running the 'kfree_rcu_test' test case [1] results in a splat [2].
The root cause is the kfree_scale_thread thread(s) continue running
after unloading the rcuscale module.  This commit fixes that isue by
invoking kfree_scale_cleanup() from rcu_scale_cleanup() when removing
the rcuscale module.

[1] modprobe rcuscale kfree_rcu_test=1
    // After some time
    rmmod rcuscale
    rmmod torture

[2] BUG: unable to handle page fault for address: ffffffffc0601a87
    #PF: supervisor instruction fetch in kernel mode
    #PF: error_code(0x0010) - not-present page
    PGD 11de4f067 P4D 11de4f067 PUD 11de51067 PMD 112f4d067 PTE 0
    Oops: 0010 [#1] PREEMPT SMP NOPTI
    CPU: 1 PID: 1798 Comm: kfree_scale_thr Not tainted 6.3.0-rc1-rcu+ #1
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015
    RIP: 0010:0xffffffffc0601a87
    Code: Unable to access opcode bytes at 0xffffffffc0601a5d.
    RSP: 0018:ffffb25bc2e57e18 EFLAGS: 00010297
    RAX: 0000000000000000 RBX: ffffffffc061f0b6 RCX: 0000000000000000
    RDX: 0000000000000000 RSI: ffffffff962fd0de RDI: ffffffff962fd0de
    RBP: ffffb25bc2e57ea8 R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
    R13: 0000000000000000 R14: 000000000000000a R15: 00000000001c1dbe
    FS:  0000000000000000(0000) GS:ffff921fa2200000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: ffffffffc0601a5d CR3: 000000011de4c006 CR4: 0000000000370ee0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
     <TASK>
     ? kvfree_call_rcu+0xf0/0x3a0
     ? kthread+0xf3/0x120
     ? kthread_complete_and_exit+0x20/0x20
     ? ret_from_fork+0x1f/0x30
     </TASK>
    Modules linked in: rfkill sunrpc ... [last unloaded: torture]
    CR2: ffffffffc0601a87
    ---[ end trace 0000000000000000 ]---

Fixes: e6e78b004f ("rcuperf: Add kfree_rcu() performance Tests")
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2023-07-11 19:39:25 +02:00
..
Kconfig printk changes for 6.2 2022-12-12 09:01:36 -08:00
Kconfig.debug rcu: Allow up to five minutes expedited RCU CPU stall-warning timeouts 2023-01-09 12:09:52 -08:00
Makefile rcuperf: Change rcuperf to rcuscale 2020-08-24 18:39:24 -07:00
rcu.h rcu-tasks: Stop rcu_tasks_invoke_cbs() from using never-onlined CPUs 2023-07-11 19:39:25 +02:00
rcu_segcblist.c rcu: Throttle callback invocation based on number of ready callbacks 2023-01-03 17:28:34 -08:00
rcu_segcblist.h rcu: Throttle callback invocation based on number of ready callbacks 2023-01-03 17:28:34 -08:00
rcuscale.c rcu/rcuscale: Stop kfree_scale_thread thread(s) after unloading rcuscale 2023-07-11 19:39:25 +02:00
rcutorture.c rcutorture: Drop sparse lock-acquisition annotations 2023-01-05 12:10:35 -08:00
refscale.c refscale: Move shutdown from wait_event() to wait_event_idle() 2023-05-24 17:30:00 +01:00
srcutiny.c srcu: Make Tiny synchronize_srcu() check for readers 2022-12-01 15:49:12 -08:00
srcutree.c srcu: Update comment after the index flip 2023-01-03 17:49:23 -08:00
sync.c rcu/sync: Use call_rcu_hurry() instead of call_rcu 2022-11-29 14:04:33 -08:00
tasks.h rcu-tasks: Stop rcu_tasks_invoke_cbs() from using never-onlined CPUs 2023-07-11 19:39:25 +02:00
tiny.c rcu: Refactor kvfree_call_rcu() and high-level helpers 2023-01-03 17:48:40 -08:00
tree.c rcu-tasks: Stop rcu_tasks_invoke_cbs() from using never-onlined CPUs 2023-07-11 19:39:25 +02:00
tree.h rcu: Add RCU stall diagnosis information 2023-01-05 12:21:11 -08:00
tree_exp.h rcu: Protect rcu_print_task_exp_stall() ->exp_tasks access 2023-05-24 17:30:00 +01:00
tree_nocb.h rcu: Shrinker for lazy rcu 2022-11-29 14:02:52 -08:00
tree_plugin.h rcu: Synchronize ->qsmaskinitnext in rcu_boost_kthread_setaffinity() 2022-10-18 14:59:57 -07:00
tree_stall.h rcu: Allow up to five minutes expedited RCU CPU stall-warning timeouts 2023-01-09 12:09:52 -08:00
update.c Merge branch 'stall.2023.01.09a' into HEAD 2023-02-02 16:40:07 -08:00