linux-kernel - KCSAN BUG report on p9_client_cb / p9_client

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Date:   Tue, 22 Jun 2021 10:42:58 -0600
From:   jim.cromie@...il.com
To:     kasan-dev@...glegroups.com, v9fs-developer@...ts.sourceforge.net
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: KCSAN BUG report on p9_client_cb / p9_client_rpc

I got this on rc7 + my hacks ( not near p9 )
ISTM someone here will know what it means.
If theres anything else i can do to help,
(configs, drop my patches and retry)
 please let me know



[   14.904783] ==================================================================
[   14.905848] BUG: KCSAN: data-race in p9_client_cb / p9_client_rpc
[   14.906769]
[   14.907040] write to 0xffff888005eb0360 of 4 bytes by interrupt on cpu 0:
[   14.907989]  p9_client_cb+0x1a/0x100
[   14.908485]  req_done+0xd3/0x130
[   14.908931]  vring_interrupt+0xac/0x130
[   14.909460]  __handle_irq_event_percpu+0x64/0x260
[   14.910095]  handle_irq_event+0x93/0x120
[   14.910637]  handle_edge_irq+0x123/0x400
[   14.911156]  __common_interrupt+0x3e/0xa0
[   14.911723]  common_interrupt+0x7e/0xa0
[   14.912270]  asm_common_interrupt+0x1e/0x40
[   14.912816]  native_safe_halt+0xe/0x10
[   14.913350]  default_idle+0xa/0x10
[   14.913801]  default_idle_call+0x38/0xc0
[   14.914361]  do_idle+0x1e7/0x270
[   14.914840]  cpu_startup_entry+0x19/0x20
[   14.915436]  rest_init+0xd0/0xd2
[   14.915878]  arch_call_rest_init+0xa/0x11
[   14.916428]  start_kernel+0xacb/0xadd
[   14.916927]  secondary_startup_64_no_verify+0xc2/0xcb
[   14.917613]
[   14.917819] read to 0xffff888005eb0360 of 4 bytes by task 261 on cpu 1:
[   14.918764]  p9_client_rpc+0x1cf/0x860
[   14.919340]  p9_client_walk+0xcf/0x350
[   14.919857]  v9fs_file_open+0x16c/0x340
[   14.920411]  do_dentry_open+0x298/0x6a0
[   14.920980]  vfs_open+0x58/0x60
[   14.921475]  path_openat+0x1130/0x1860
[   14.922126]  do_filp_open+0x116/0x1f0
[   14.922731]  do_sys_openat2+0x91/0x190
[   14.923267]  __x64_sys_openat+0x9b/0xd0
[   14.923790]  do_syscall_64+0x42/0x80
[   14.924295]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[   14.924955]
[   14.925159] Reported by Kernel Concurrency Sanitizer on:
[   14.925899] CPU: 1 PID: 261 Comm: ip Not tainted
5.13.0-rc7-dd7i-00036-gb82eaba47adf-dirty #121
[   14.927094] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.14.0-3.fc34 04/01/2014
[   14.928292] ==================================================================
virtme-init: console is ttyS0