syzbot


KMSAN: uninit-value in n_tty_receive_buf_standard

Status: upstream: reported C repro on 2024/01/01 13:38
Subsystems: serial
[Documentation on labels]
Reported-by: syzbot+559c7fe4b8bac56d38c2@syzkaller.appspotmail.com
First crash: 523d, last: 1d11h
Discussions (9)
Title Replies (including bot) Last reply
[syzbot] Monthly serial report (Jan 2025) 0 (1) 2025/01/17 10:36
[syzbot] Monthly serial report (Dec 2024) 0 (1) 2024/12/17 09:47
[syzbot] Monthly serial report (Nov 2024) 0 (1) 2024/11/18 10:38
[syzbot] Monthly serial report (Oct 2024) 0 (1) 2024/10/15 08:33
[syzbot] Monthly serial report (Sep 2024) 0 (1) 2024/09/14 10:58
[syzbot] Monthly serial report (Aug 2024) 0 (1) 2024/08/13 12:34
[syzbot] Monthly serial report (Jun 2024) 0 (1) 2024/06/10 12:41
[syzbot] Monthly serial report (Feb 2024) 1 (2) 2024/02/05 08:09
[syzbot] [serial?] KMSAN: uninit-value in n_tty_receive_buf_standard 0 (1) 2024/01/01 13:38
Last patch testing requests (2)
Created Duration User Patch Repo Result
2024/01/14 07:09 22m retest repro upstream OK log
2024/01/14 07:09 29m retest repro upstream OK log

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in variable_test_bit arch/x86/include/asm/bitops.h:227 [inline]
BUG: KMSAN: uninit-value in arch_test_bit arch/x86/include/asm/bitops.h:239 [inline]
BUG: KMSAN: uninit-value in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
BUG: KMSAN: uninit-value in n_tty_receive_buf_standard+0xc58/0x9220 drivers/tty/n_tty.c:1603
 variable_test_bit arch/x86/include/asm/bitops.h:227 [inline]
 arch_test_bit arch/x86/include/asm/bitops.h:239 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
 n_tty_receive_buf_standard+0xc58/0x9220 drivers/tty/n_tty.c:1603
 __receive_buf drivers/tty/n_tty.c:1640 [inline]
 n_tty_receive_buf_common+0x18d8/0x2490 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:4110 [inline]
 slab_alloc_node mm/slub.c:4153 [inline]
 __do_kmalloc_node mm/slub.c:4282 [inline]
 __kmalloc_noprof+0x923/0x1230 mm/slub.c:4295
 kmalloc_noprof include/linux/slab.h:905 [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:3550
 serial8250_read_char+0x1a7/0x5d0 drivers/tty/serial/8250/8250_port.c:1762
 serial8250_rx_chars drivers/tty/serial/8250/8250_port.c:1779 [inline]
 serial8250_handle_irq+0x970/0x1130 drivers/tty/serial/8250/8250_port.c:1943
 serial8250_default_handle_irq+0x120/0x2b0 drivers/tty/serial/8250/8250_port.c:1968
 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: 1 UID: 0 PID: 59 Comm: kworker/u8:4 Not tainted 6.13.0-rc1-syzkaller-00337-g7503345ac5f5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events_unbound flush_to_ldisc
=====================================================

Crashes (734):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/12/08 15:53 upstream 7503345ac5f5 9ac0fdc6 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/02 02:22 upstream 994d5c58e50e f819d6f7 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/09/23 13:02 upstream d90b0276af8f 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/30 01:31 upstream 05dbaf8dd8bf afe4eff5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/23 00:05 upstream c4b9570cfb63 25e17fd3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/22 13:29 upstream 9f3ee94e705a da72ac06 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/20 19:42 upstream ffd294d346d1 6e87cfa2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/19 17:33 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/19 12:57 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/18 23:07 upstream 595523945be0 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/18 15:55 upstream 595523945be0 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/18 14:00 upstream 595523945be0 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/18 11:39 upstream 595523945be0 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/18 07:23 upstream 595523945be0 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/16 14:32 upstream 619f0b6fad52 968edaf4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/16 00:11 upstream 619f0b6fad52 968edaf4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/15 20:25 upstream 619f0b6fad52 7315a7cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/15 12:23 upstream 619f0b6fad52 7315a7cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/14 23:04 upstream c3812b15000c 7315a7cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/14 08:20 upstream c45323b7560e b1f1cd88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/14 06:59 upstream c45323b7560e b1f1cd88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/12 17:56 upstream b62cef9a5c67 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/12 14:49 upstream b62cef9a5c67 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/12 04:55 upstream 77a903cd8e5a 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/11 06:09 upstream e0daef7de1ac 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/10 16:07 upstream 2144da25584e 67d7ec0a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/08 06:14 upstream 09a0fa92e5b4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/06 02:33 upstream 9244696b34f2 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/05 19:23 upstream ab75170520d4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/05 08:41 upstream ab75170520d4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/05 08:13 upstream ab75170520d4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/04 11:46 upstream 63676eefb7a0 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/04 05:31 upstream 63676eefb7a0 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/02 15:45 upstream 56e6a3499e14 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/02 06:45 upstream 56e6a3499e14 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/23 17:22 upstream 5254c0cbc92d fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/19 23:12 upstream 55cb5f43689d 3ad490ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/16 02:15 upstream 3bd7d7488169 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2025/02/05 09:03 upstream 5c8c229261f1 5896748e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/02/02 09:55 upstream a86bf2283d2c 568559e4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/02/02 03:43 upstream a86bf2283d2c 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/30 05:21 upstream ebbb8be421ee afe4eff5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/29 10:57 upstream 805ba04cb7cc 865ef71e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/28 15:36 upstream 805ba04cb7cc f5427d7c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/27 06:57 upstream 9c5968db9e62 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/26 17:23 upstream aa22f4da2a46 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/25 00:54 upstream ab18b8fff124 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/17 15:24 upstream 9bffa1ad25b8 953d1c45 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/10 23:48 upstream f8c6263347e1 67d7ec0a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/10 08:52 upstream 2144da25584e 67d7ec0a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_standard
2025/01/04 18:55 upstream 63676eefb7a0 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in n_tty_receive_buf_standard
* Struck through repros no longer work on HEAD.