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: 232d, last: 2d06h
Discussions (2)
Title Replies (including bot) Last reply
[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+0xc58/0x9230 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+0xc58/0x9230 drivers/tty/n_tty.c:1603
 __receive_buf drivers/tty/n_tty.c:1630 [inline]
 n_tty_receive_buf_common+0x178e/0x2310 drivers/tty/n_tty.c:1729
 n_tty_receive_buf2+0x4c/0x60 drivers/tty/n_tty.c:1775
 tty_ldisc_receive_buf+0xce/0x270 drivers/tty/tty_buffer.c:386
 tty_port_default_receive_buf+0xdf/0x190 drivers/tty/tty_port.c:37
 receive_buf drivers/tty/tty_buffer.c:444 [inline]
 flush_to_ldisc+0x4b7/0xdc0 drivers/tty/tty_buffer.c:494
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2703
 worker_thread+0xf45/0x1490 kernel/workqueue.c:2784
 kthread+0x3ed/0x540 kernel/kthread.c:388
 ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

Uninit was created at:
 slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768
 slab_alloc_node mm/slub.c:3478 [inline]
 __kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517
 __do_kmalloc_node mm/slab_common.c:1006 [inline]
 __kmalloc+0x121/0x3c0 mm/slab_common.c:1020
 kmalloc include/linux/slab.h:604 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:179 [inline]
 __tty_buffer_request_room+0x36e/0x6c0 drivers/tty/tty_buffer.c:272
 __tty_insert_flip_string_flags+0x140/0x560 drivers/tty/tty_buffer.c:308
 tty_insert_flip_char include/linux/tty_flip.h:77 [inline]
 uart_insert_char+0x39e/0xa00 drivers/tty/serial/serial_core.c:3494
 serial8250_read_char+0x1a2/0x5d0 drivers/tty/serial/8250/8250_port.c:1760
 serial8250_rx_chars drivers/tty/serial/8250/8250_port.c:1777 [inline]
 serial8250_handle_irq+0x77b/0xb30 drivers/tty/serial/8250/8250_port.c:1937
 serial8250_default_handle_irq+0x11a/0x2a0 drivers/tty/serial/8250/8250_port.c:1962
 serial8250_interrupt+0xc0/0x350 drivers/tty/serial/8250/8250_core.c:127
 __handle_irq_event_percpu+0x113/0xc90 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+0x341/0xf90 kernel/irq/chip.c:831
 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
 handle_irq arch/x86/kernel/irq.c:238 [inline]
 __common_interrupt+0x94/0x1f0 arch/x86/kernel/irq.c:257
 common_interrupt+0x89/0xa0 arch/x86/kernel/irq.c:247
 asm_common_interrupt+0x2b/0x40 arch/x86/include/asm/idtentry.h:636

CPU: 0 PID: 3894 Comm: kworker/u4:23 Not tainted 6.7.0-rc3-syzkaller-00134-g994d5c58e50e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Workqueue: events_unbound flush_to_ldisc
=====================================================

Crashes (209):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
2024/04/19 02:00 upstream 8cd26fd90c1a af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2024/01/30 09:54 upstream 9f8413c4a66f 991a98f4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/30 21:25 upstream f016f7547aee 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
2023/12/23 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
2023/12/23 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
2023/12/22 18:29 upstream 24e0d2e527a3 4f9530a3 .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
2023/12/19 02:32 upstream 2cf4f94d8e86 3ad490ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/18 09:33 upstream ceb6a6f023fd 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/18 08:27 upstream ceb6a6f023fd 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/17 19:12 upstream 0e389834672c 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/17 01:19 upstream c8e97fc6b4c0 3222d10c .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 17:26 upstream c8e97fc6b4c0 3222d10c .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
2023/12/15 12:59 upstream 3f7168591ebf 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/13 22:45 upstream 5bd7ef53ffe5 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/13 11:56 upstream 88035e5694a8 ebcad15c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/12 22:57 upstream eaadbbaaff74 ebcad15c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/12 20:52 upstream 26aff849438c ebcad15c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/12 18:33 upstream 26aff849438c ebcad15c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/12 16:16 upstream 26aff849438c ebcad15c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/12 13:09 upstream 26aff849438c ebcad15c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/12 04:29 upstream 26aff849438c 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/11 04:48 upstream a39b6ac3781d 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/11 03:33 upstream a39b6ac3781d 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/10 14:02 upstream c527f5606aa5 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/10 00:31 upstream b10a3ccaf6e3 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/08 14:58 upstream 5e3f5b81de80 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/08 00:41 upstream 9ace34a8e446 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/07 19:02 upstream bee0e7762ad2 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/07 13:42 upstream bee0e7762ad2 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/06 15:41 upstream bee0e7762ad2 e3299f55 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/06 14:24 upstream bee0e7762ad2 e3299f55 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/05 00:56 upstream bee0e7762ad2 f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/05 00:20 upstream bee0e7762ad2 f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/04 12:20 upstream 33cc938e65a9 f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/04 05:22 upstream 33cc938e65a9 f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/03 16:54 upstream 33cc938e65a9 f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/03 15:48 upstream 33cc938e65a9 f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/03 03:24 upstream 1b8af6552cb7 f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/02 19:41 upstream 815fb87b7530 f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/02 10:23 upstream 815fb87b7530 f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/01 16:21 upstream 994d5c58e50e f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/12/01 01:10 upstream e8f60209d6cf f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/11/29 20:53 upstream 3b47bc037bd4 6e78f9ce .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/11/29 14:54 upstream 18d46e76d7c2 6e78f9ce .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2023/11/28 04:18 upstream df60cee26a2e 9fe51b7c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce KMSAN: uninit-value in n_tty_receive_buf_standard
2024/04/06 17:02 upstream e8b0ccb2a787 ca620dd8 .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
2024/01/26 07:44 upstream 9f8413c4a66f cc4a4020 .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.