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X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Jan 13, 2026 at 08:36:39PM +0530, Swaraj Gaikwad wrote: > On PREEMPT_RT kernels, local_lock becomes a sleeping lock. The current > check in kmalloc_nolock() only verifies we're not in NMI or hard IRQ > context, but misses the case where preemption is disabled. > > When a BPF program runs from a tracepoint with preemption disabled > (preempt_count > 0), kmalloc_nolock() proceeds to call > local_lock_irqsave() which attempts to acquire a sleeping lock, > triggering: > > BUG: sleeping function called from invalid context > in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 6128 > preempt_count: 2, expected: 0 > > Fix this by checking !preemptible() on PREEMPT_RT, which directly > expresses the constraint that we cannot take a sleeping lock when > preemption is disabled. This encompasses the previous checks for NMI > and hard IRQ contexts while also catching cases where preemption is > disabled. > > Fixes: af92793e52c3 ("slab: Introduce kmalloc_nolock() and kfree_nolock().") > Reported-by: syzbot+b1546ad4a95331b2101e@syzkaller.appspotmail.com > Closes: https://syzkaller.appspot.com/bug?extid=b1546ad4a95331b2101e > Signed-off-by: Swaraj Gaikwad > --- Acked-by: Harry Yoo -- Cheers, Harry / Hyeonggon