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KCSAN: data-race in n_tty_lookahead_flow_ctrl / tty_set_termios (3)

Status: auto-obsoleted due to no activity on 2024/02/26 02:18
Subsystems: serial
[Documentation on labels]
Reported-by: syzbot+9917aec85ebf70125fd9@syzkaller.appspotmail.com
First crash: 148d, last: 148d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in n_tty_lookahead_flow_ctrl / tty_set_termios (4) serial 1 75d 75d 0/27 auto-obsoleted due to no activity on 2024/05/09 07:47
upstream KCSAN: data-race in n_tty_lookahead_flow_ctrl / tty_set_termios (2) serial 1 324d 324d 0/27 auto-obsoleted due to no activity on 2023/09/02 17:23
upstream KCSAN: data-race in n_tty_lookahead_flow_ctrl / tty_set_termios serial 52 507d 677d 0/27 auto-obsoleted due to no activity on 2023/04/08 10:34

Sample crash report:
==================================================================
BUG: KCSAN: data-race in n_tty_lookahead_flow_ctrl / tty_set_termios

read-write to 0xffff8881329fb108 of 4 bytes by task 14869 on cpu 1:
 unset_locked_termios drivers/tty/tty_ioctl.c:214 [inline]
 tty_set_termios+0xfa/0x8a0 drivers/tty/tty_ioctl.c:340
 set_termios+0x355/0x4c0 drivers/tty/tty_ioctl.c:520
 tty_mode_ioctl+0x391/0x5d0
 n_tty_ioctl_helper+0x8d/0x240 drivers/tty/tty_ioctl.c:986
 n_tty_ioctl+0xfd/0x200 drivers/tty/n_tty.c:2511
 tty_ioctl+0x875/0xbc0 drivers/tty/tty_io.c:2812
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xcf/0x140 fs/ioctl.c:857
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff8881329fb108 of 4 bytes by task 29857 on cpu 0:
 n_tty_lookahead_flow_ctrl+0x5b/0x130 drivers/tty/n_tty.c:1509
 tty_port_default_lookahead_buf+0x87/0xb0 drivers/tty/tty_port.c:59
 lookahead_bufs drivers/tty/tty_buffer.c:427 [inline]
 flush_to_ldisc+0x30c/0x400 drivers/tty/tty_buffer.c:497
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2706
 worker_thread+0x525/0x730 kernel/workqueue.c:2787
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

value changed: 0x00000009 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 29857 Comm: kworker/u4:25 Not tainted 6.7.0-syzkaller-13004-g4fbbed787267 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Workqueue: events_unbound flush_to_ldisc
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/01/22 02:17 upstream 4fbbed787267 9bd8dcda .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in n_tty_lookahead_flow_ctrl / tty_set_termios
* Struck through repros no longer work on HEAD.