=====================================================
BUG: KMSAN: uninit-value in variable_test_bit arch/x86/include/asm/bitops.h:214 [inline]
BUG: KMSAN: uninit-value in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
BUG: KMSAN: uninit-value in n_tty_receive_buf_standard drivers/tty/n_tty.c:1529 [inline]
BUG: KMSAN: uninit-value in __receive_buf drivers/tty/n_tty.c:1549 [inline]
BUG: KMSAN: uninit-value in n_tty_receive_buf_common+0x1d60/0xd680 drivers/tty/n_tty.c:1645
 variable_test_bit arch/x86/include/asm/bitops.h:214 [inline]
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
 n_tty_receive_buf_standard drivers/tty/n_tty.c:1529 [inline]
 __receive_buf drivers/tty/n_tty.c:1549 [inline]
 n_tty_receive_buf_common+0x1d60/0xd680 drivers/tty/n_tty.c:1645
 n_tty_receive_buf2+0xc2/0xe0 drivers/tty/n_tty.c:1680
 tty_ldisc_receive_buf+0x16b/0x350 drivers/tty/tty_buffer.c:451
 tty_port_default_receive_buf+0x14f/0x1e0 drivers/tty/tty_port.c:39
 receive_buf drivers/tty/tty_buffer.c:471 [inline]
 flush_to_ldisc+0x55b/0x9d0 drivers/tty/tty_buffer.c:521
 process_one_work+0xe67/0x1860 kernel/workqueue.c:2289
 worker_thread+0x1100/0x21f0 kernel/workqueue.c:2436
 kthread+0x3c7/0x500 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:754 [inline]
 slab_alloc_node mm/slub.c:3231 [inline]
 slab_alloc mm/slub.c:3239 [inline]
 __kmalloc+0xbfa/0x1260 mm/slub.c:4425
 kmalloc include/linux/slab.h:586 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:178 [inline]
 __tty_buffer_request_room+0x4e9/0x900 drivers/tty/tty_buffer.c:274
 __tty_insert_flip_char+0xea/0x3d0 drivers/tty/tty_buffer.c:392
 tty_insert_flip_char include/linux/tty_flip.h:35 [inline]
 uart_insert_char+0x4c5/0xbc0 drivers/tty/serial/serial_core.c:3158
 serial8250_read_char+0x271/0x810 drivers/tty/serial/8250/8250_port.c:1792
 serial8250_rx_chars drivers/tty/serial/8250/8250_port.c:1807 [inline]
 serial8250_handle_irq+0x536/0x980 drivers/tty/serial/8250/8250_port.c:1948
 serial8250_default_handle_irq+0x184/0x380 drivers/tty/serial/8250/8250_port.c:1970
 serial8250_interrupt+0x107/0x3f0 drivers/tty/serial/8250/8250_core.c:126
 __handle_irq_event_percpu+0x154/0xb60 kernel/irq/handle.c:158
 handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
 handle_irq_event+0x146/0x390 kernel/irq/handle.c:210
 handle_edge_irq+0x469/0x13e0 kernel/irq/chip.c:817
 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
 handle_irq arch/x86/kernel/irq.c:231 [inline]
 __common_interrupt+0xfc/0x360 arch/x86/kernel/irq.c:250
 common_interrupt+0xaf/0xd0 arch/x86/kernel/irq.c:240
 asm_common_interrupt+0x1e/0x40

CPU: 1 PID: 8 Comm: kworker/u4:0 Not tainted 5.18.0-syzkaller-16253-g2f3064574275 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound flush_to_ldisc
=====================================================