syzbot


KCSAN: data-race in __start_tty / n_tty_receive_char (3)

Status: moderation: reported on 2024/04/19 10:17
Subsystems: serial
[Documentation on labels]
Reported-by: syzbot+78a6460028930aca824f@syzkaller.appspotmail.com
First crash: 28d, last: 16d
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __start_tty / n_tty_receive_char serial 1 366d 366d 0/26 auto-obsoleted due to no activity on 2023/06/22 00:17
upstream KCSAN: data-race in __start_tty / n_tty_receive_char (2) serial 1 67d 67d 0/26 auto-obsoleted due to no activity on 2024/04/15 08:15

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __start_tty / n_tty_receive_char

write to 0xffff88811606f9bc of 1 bytes by task 24436 on cpu 0:
 __start_tty+0x73/0x170 drivers/tty/tty_io.c:786
 n_tty_ioctl_helper+0x112/0x240 drivers/tty/tty_ioctl.c:963
 n_tty_ioctl+0xfd/0x200 drivers/tty/n_tty.c:2511
 tty_ioctl+0x886/0xbe0 drivers/tty/tty_io.c:2812
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:904 [inline]
 __se_sys_ioctl+0xd3/0x150 fs/ioctl.c:890
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:890
 x64_sys_call+0x155d/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811606f9bc of 1 bytes by task 1831 on cpu 1:
 n_tty_receive_char+0x3d/0x680 drivers/tty/n_tty.c:1427
 n_tty_receive_buf_standard+0x4bd/0x2e30 drivers/tty/n_tty.c:1606
 __receive_buf drivers/tty/n_tty.c:1630 [inline]
 n_tty_receive_buf_common+0x7e5/0xbd0 drivers/tty/n_tty.c:1729
 n_tty_receive_buf2+0x33/0x40 drivers/tty/n_tty.c:1775
 tty_ldisc_receive_buf+0x63/0x100 drivers/tty/tty_buffer.c:387
 tty_port_default_receive_buf+0x59/0x90 drivers/tty/tty_port.c:37
 receive_buf drivers/tty/tty_buffer.c:445 [inline]
 flush_to_ldisc+0x1ce/0x410 drivers/tty/tty_buffer.c:495
 process_one_work kernel/workqueue.c:3267 [inline]
 process_scheduled_works+0x465/0x990 kernel/workqueue.c:3348
 worker_thread+0x526/0x730 kernel/workqueue.c:3429
 kthread+0x1d1/0x210 kernel/kthread.c:388
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x01 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1831 Comm: kworker/u8:8 Tainted: G        W          6.9.0-rc6-syzkaller-00053-g0106679839f7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: events_unbound flush_to_ldisc
==================================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/01 18:35 upstream 0106679839f7 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __start_tty / n_tty_receive_char
2024/04/20 10:39 upstream 13a2e429f644 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __start_tty / n_tty_receive_char
2024/04/19 10:17 upstream 2668e3ae2ef3 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __start_tty / n_tty_receive_char
* Struck through repros no longer work on HEAD.