syzbot


KCSAN: data-race in __stop_tty / pty_write_room (5)

Status: auto-obsoleted due to no activity on 2024/04/16 09:50
Subsystems: serial
[Documentation on labels]
Reported-by: syzbot+0577961eb1eae3e7066e@syzkaller.appspotmail.com
First crash: 38d, last: 35d
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __stop_tty / pty_write_room (2) serial 1 412d 412d 0/26 auto-obsoleted due to no activity on 2023/04/12 12:14
upstream KCSAN: data-race in __stop_tty / pty_write_room (3) serial 3 233d 242d 0/26 auto-obsoleted due to no activity on 2023/10/01 10:28
upstream KCSAN: data-race in __stop_tty / pty_write_room serial 1 697d 697d 0/26 auto-closed as invalid on 2022/06/24 17:06
upstream KCSAN: data-race in __stop_tty / pty_write_room (4) serial 2 83d 83d 0/26 auto-obsoleted due to no activity on 2024/02/28 07:28

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __stop_tty / pty_write_room

write to 0xffff8881553a5dbc of 1 bytes by task 12084 on cpu 0:
 __stop_tty+0x42/0x90 drivers/tty/tty_io.c:753
 n_tty_ioctl_helper+0x21f/0x240 drivers/tty/tty_ioctl.c:955
 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:904 [inline]
 __se_sys_ioctl+0xcf/0x140 fs/ioctl.c:890
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:890
 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+0x63/0x6b

read to 0xffff8881553a5dbc of 1 bytes by task 17099 on cpu 1:
 pty_write_room+0x1c/0x70 drivers/tty/pty.c:131
 tty_write_room+0x38/0x50 drivers/tty/tty_ioctl.c:69
 __process_echoes+0x36/0x6a0 drivers/tty/n_tty.c:703
 flush_echoes drivers/tty/n_tty.c:807 [inline]
 __receive_buf drivers/tty/n_tty.c:1632 [inline]
 n_tty_receive_buf_common+0x8e6/0xbc0 drivers/tty/n_tty.c:1729
 n_tty_receive_buf2+0x33/0x40 drivers/tty/n_tty.c:1775
 tty_ldisc_receive_buf+0x60/0xe0 drivers/tty/tty_buffer.c:386
 tty_port_default_receive_buf+0x59/0x90 drivers/tty/tty_port.c:37
 receive_buf drivers/tty/tty_buffer.c:444 [inline]
 flush_to_ldisc+0x1ca/0x400 drivers/tty/tty_buffer.c:494
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0x460/0x980 kernel/workqueue.c:3335
 worker_thread+0x525/0x730 kernel/workqueue.c:3416
 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:243

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17099 Comm: kworker/u8:10 Not tainted 6.8.0-syzkaller-00711-g045395d86acd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Workqueue: events_unbound flush_to_ldisc
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/12 09:50 upstream 045395d86acd 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __stop_tty / pty_write_room
2024/03/08 23:14 upstream 10d48d70e82d 8e75c913 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __stop_tty / pty_write_room
* Struck through repros no longer work on HEAD.