=====================================================
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:1557 [inline]
BUG: KMSAN: uninit-value in __receive_buf drivers/tty/n_tty.c:1577 [inline]
BUG: KMSAN: uninit-value in n_tty_receive_buf_common+0x1e6c/0x10360 drivers/tty/n_tty.c:1674
 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:1557 [inline]
 __receive_buf drivers/tty/n_tty.c:1577 [inline]
 n_tty_receive_buf_common+0x1e6c/0x10360 drivers/tty/n_tty.c:1674
 n_tty_receive_buf2+0xbe/0xd0 drivers/tty/n_tty.c:1709
 tty_ldisc_receive_buf+0x15e/0x390 drivers/tty/tty_buffer.c:471
 tty_port_default_receive_buf+0x14b/0x1e0 drivers/tty/tty_port.c:39
 receive_buf drivers/tty/tty_buffer.c:491 [inline]
 flush_to_ldisc+0x5bf/0xa10 drivers/tty/tty_buffer.c:543
 process_one_work+0xdc2/0x1820 kernel/workqueue.c:2298
 worker_thread+0x10f1/0x2290 kernel/workqueue.c:2445
 kthread+0x721/0x850 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:524 [inline]
 slab_alloc_node mm/slub.c:3251 [inline]
 slab_alloc mm/slub.c:3259 [inline]
 __kmalloc+0xc3c/0x12d0 mm/slub.c:4437
 kmalloc include/linux/slab.h:595 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:177 [inline]
 __tty_buffer_request_room+0x4d2/0x900 drivers/tty/tty_buffer.c:275
 __tty_insert_flip_char+0xe5/0x3d0 drivers/tty/tty_buffer.c:392
 tty_insert_flip_char include/linux/tty_flip.h:36 [inline]
 uart_insert_char+0x495/0xb70 drivers/tty/serial/serial_core.c:3139
 serial8250_read_char+0x280/0x820 drivers/tty/serial/8250/8250_port.c:1769
 serial8250_rx_chars drivers/tty/serial/8250/8250_port.c:1784 [inline]
 serial8250_handle_irq+0x540/0x980 drivers/tty/serial/8250/8250_port.c:1927
 serial8250_default_handle_irq+0x18f/0x370 drivers/tty/serial/8250/8250_port.c:1949
 serial8250_interrupt+0x111/0x3f0 drivers/tty/serial/8250/8250_core.c:126
 __handle_irq_event_percpu+0x188/0xc90 kernel/irq/handle.c:158
 handle_irq_event_percpu kernel/irq/handle.c:198 [inline]
 handle_irq_event+0x188/0x420 kernel/irq/handle.c:215
 handle_edge_irq+0x472/0x13e0 kernel/irq/chip.c:822
 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
 handle_irq arch/x86/kernel/irq.c:231 [inline]
 __common_interrupt+0xf8/0x360 arch/x86/kernel/irq.c:250
 common_interrupt+0xb1/0xd0 arch/x86/kernel/irq.c:240
 asm_common_interrupt+0x1e/0x40

CPU: 0 PID: 1056 Comm: kworker/u4:5 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound flush_to_ldisc
=====================================================