syzbot


KMSAN: uninit-value in n_tty_receive_buf_closing (3)

Status: upstream: reported on 2024/08/19 13:42
Subsystems: serial
[Documentation on labels]
Reported-by: syzbot+dd514b5f0cf048aec256@syzkaller.appspotmail.com
First crash: 50d, last: 1d11h
Discussions (2)
Title Replies (including bot) Last reply
[syzbot] Monthly serial report (Sep 2024) 0 (1) 2024/09/14 10:58
[syzbot] [serial?] KMSAN: uninit-value in n_tty_receive_buf_closing (3) 0 (1) 2024/08/19 13:42
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in n_tty_receive_buf_closing serial 2 375d 387d 0/28 closed as invalid on 2023/12/22 15:49
upstream KMSAN: uninit-value in n_tty_receive_buf_closing (2) serial 1 274d 269d 0/28 auto-obsoleted due to no activity on 2024/04/13 06:47

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in n_tty_receive_char_closing drivers/tty/n_tty.c:1454 [inline]
BUG: KMSAN: uninit-value in n_tty_receive_buf_closing+0x539/0xb40 drivers/tty/n_tty.c:1567
 n_tty_receive_char_closing drivers/tty/n_tty.c:1454 [inline]
 n_tty_receive_buf_closing+0x539/0xb40 drivers/tty/n_tty.c:1567
 __receive_buf drivers/tty/n_tty.c:1630 [inline]
 n_tty_receive_buf_common+0x196b/0x2490 drivers/tty/n_tty.c:1739
 n_tty_receive_buf2+0x4c/0x60 drivers/tty/n_tty.c:1785
 tty_ldisc_receive_buf+0xd0/0x290 drivers/tty/tty_buffer.c:387
 tty_port_default_receive_buf+0xdf/0x190 drivers/tty/tty_port.c:37
 receive_buf drivers/tty/tty_buffer.c:445 [inline]
 flush_to_ldisc+0x473/0xdb0 drivers/tty/tty_buffer.c:495
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310
 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391
 kthread+0x3e2/0x540 kernel/kthread.c:389
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4092 [inline]
 slab_alloc_node mm/slub.c:4135 [inline]
 __do_kmalloc_node mm/slub.c:4264 [inline]
 __kmalloc_noprof+0x661/0xf30 mm/slub.c:4277
 kmalloc_noprof include/linux/slab.h:882 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:180 [inline]
 __tty_buffer_request_room+0x36e/0x6d0 drivers/tty/tty_buffer.c:273
 __tty_insert_flip_string_flags+0x140/0x570 drivers/tty/tty_buffer.c:309
 tty_insert_flip_char include/linux/tty_flip.h:77 [inline]
 uart_insert_char+0x39e/0xa10 drivers/tty/serial/serial_core.c:3568
 serial8250_read_char+0x1a7/0x5d0 drivers/tty/serial/8250/8250_port.c:1743
 serial8250_rx_chars drivers/tty/serial/8250/8250_port.c:1760 [inline]
 serial8250_handle_irq+0x970/0x1130 drivers/tty/serial/8250/8250_port.c:1924
 serial8250_default_handle_irq+0x120/0x2b0 drivers/tty/serial/8250/8250_port.c:1949
 serial8250_interrupt+0xc5/0x360 drivers/tty/serial/8250/8250_core.c:86
 __handle_irq_event_percpu+0x118/0xca0 kernel/irq/handle.c:158
 handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
 handle_irq_event+0xef/0x2c0 kernel/irq/handle.c:210
 handle_edge_irq+0x340/0xfb0 kernel/irq/chip.c:831
 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
 handle_irq arch/x86/kernel/irq.c:247 [inline]
 call_irq_handler arch/x86/kernel/irq.c:259 [inline]
 __common_interrupt+0x97/0x1f0 arch/x86/kernel/irq.c:285
 common_interrupt+0x92/0xb0 arch/x86/kernel/irq.c:278
 asm_common_interrupt+0x2b/0x40 arch/x86/include/asm/idtentry.h:693

CPU: 0 UID: 0 PID: 3388 Comm: kworker/u8:19 Not tainted 6.11.0-syzkaller-08833-gde5cb0dcb74c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: events_unbound flush_to_ldisc
=====================================================

Crashes (23):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/09/23 13:02 upstream de5cb0dcb74c 89298aad .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/10/03 14:29 upstream 7ec462100ef9 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/10/03 14:29 upstream 7ec462100ef9 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/10/03 02:38 upstream f23aa4c0761a a4c7fd36 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/10/01 07:38 upstream e32cde8d2bd7 bbd4e0a4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/10/01 07:38 upstream e32cde8d2bd7 bbd4e0a4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/09/29 21:52 upstream e7ed34365879 ba29ff75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/09/29 21:52 upstream e7ed34365879 ba29ff75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/09/27 18:29 upstream 075dbe9f6e3c 2b1784d6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/09/26 22:34 upstream 13882369ceb9 0d19f247 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/09/25 04:59 upstream 684a64bf32b6 5643e0e9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/09/11 10:14 upstream 8d8d276ba2fb 9326a104 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/09/10 21:57 upstream 8d8d276ba2fb 79eef296 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/09/10 21:57 upstream 8d8d276ba2fb 79eef296 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/09/07 06:20 upstream b31c44928842 9750182a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/09/06 06:29 upstream ad618736883b 464ac2ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/09/06 06:29 upstream ad618736883b 464ac2ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/09/03 22:58 upstream 88fac17500f4 9d47f20a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/08/25 18:30 upstream 5be63fc19fca d7d32352 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/08/25 18:30 upstream 5be63fc19fca d7d32352 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/08/25 11:23 upstream 780bdc1ba776 d7d32352 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/08/25 11:23 upstream 780bdc1ba776 d7d32352 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
2024/08/15 13:36 upstream 1fb918967b56 e4bacdaf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_closing
* Struck through repros no longer work on HEAD.