diff options
author | Darrick J. Wong <darrick.wong@oracle.com> | 2019-10-03 14:36:08 -0700 |
---|---|---|
committer | Darrick J. Wong <darrick.wong@oracle.com> | 2019-10-09 09:39:17 -0700 |
commit | 00eb83290fa7767680bf685b8b4707324b2915a5 (patch) | |
tree | 6ab788533dafaa89314560fd7af5f1b6f8313290 /security/keys | |
parent | 93b8e4e7536efbf0c9cdc9404ecee880e1515c35 (diff) |
"BUG: kernel NULL pointer dereference, address: 0000000000000002"xfs-5.4-fixes_2019-10-09
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 0 P4D 0
Oops: 0002 [#1] SMP DEBUG_PAGEALLOC
CPU: 40 PID: 555153 Comm: kworker/u98:50 Kdump: loaded Not tainted
...
Workqueue: writeback wb_workfn (flush-btrfs-1)
RIP: 0010:_raw_spin_lock_irqsave+0x10/0x30
Code: 48 89 d8 5b c3 e8 50 db 6b ff eb f4 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 53 9c 5b fa 31 c0 ba 01 00 00 00 <f0> 0f b1 17 75 05 48 89 d8 5b c3 89 c6 e8 fe ca 6b ff eb f2 66 90
RSP: 0018:ffffc90049b27d98 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000246 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000003 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001
R10: ffff889fff407600 R11: ffff88ba9395d740 R12: 000000000000e300
R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88bfdfa00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 0000000002409005 CR4: 00000000001606e0
Call Trace:
__wake_up_common_lock+0x63/0xc0
wb_workfn+0xd2/0x3e0
process_one_work+0x1f5/0x3f0
worker_thread+0x2d/0x3d0
kthread+0x111/0x130
ret_from_fork+0x1f/0x30
Fix it by reading and caching @done->waitq before decrementing
@done->cnt.
Signed-off-by: Tejun Heo <tj@kernel.org>
Debugged-by: Chris Mason <clm@fb.com>
Fixes: 30638b0125e1 ("writeback: Generalize and expose wb_completion")
Cc: stable@vger.kernel.org # v5.2+
Diffstat (limited to 'security/keys')
0 files changed, 0 insertions, 0 deletions