[PATCH v3 0/2] fcntl: fix potential deadlocks
Desmond Cheong Zhi Xi
desmondcheongzx at gmail.com
Wed Jul 7 07:43:59 UTC 2021
Sorry for the delay between v1 and v2, there was an unrelated issue with Syzbot testing.
Syzbot reports a possible irq lock inversion dependency:
While investigating this error, I discovered that multiple similar lock inversion scenarios can occur. Hence, this series addresses potential deadlocks for two classes of locks, one in each patch:
1. Fix potential deadlocks for &fown_struct.lock
2. Fix potential deadlock for &fasync_struct.fa_lock
v2 -> v3:
- Removed WARN_ON_ONCE, keeping elaboration for why read_lock_irq is safe to use in the commit message. As suggested by Greg KH.
v1 -> v2:
- Added WARN_ON_ONCE(irqs_disabled()) before calls to read_lock_irq, and added elaboration in the commit message. As suggested by Jeff Layton.
Desmond Cheong Zhi Xi (2):
fcntl: fix potential deadlocks for &fown_struct.lock
fcntl: fix potential deadlock for &fasync_struct.fa_lock
fs/fcntl.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)
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