syzbot


KCSAN: data-race in __stop_tty / pty_write (13)

Status: moderation: reported on 2024/03/20 09:24
Subsystems: serial
[Documentation on labels]
Reported-by: syzbot+8e125c73756bec7942ee@syzkaller.appspotmail.com
First crash: 32d, last: 8d06h
Similar bugs (12)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __stop_tty / pty_write serial 1 1010d 1010d 0/26 auto-closed as invalid on 2021/08/19 13:20
upstream KCSAN: data-race in __stop_tty / pty_write (6) serial 1 703d 703d 0/26 auto-closed as invalid on 2022/06/22 11:40
upstream KCSAN: data-race in __stop_tty / pty_write (8) serial 4 364d 379d 0/26 auto-obsoleted due to no activity on 2023/05/28 07:29
upstream KCSAN: data-race in __stop_tty / pty_write (9) serial 3 273d 304d 0/26 auto-obsoleted due to no activity on 2023/08/26 21:27
upstream KCSAN: data-race in __stop_tty / pty_write (2) serial 1 928d 928d 0/26 auto-closed as invalid on 2021/11/09 20:04
upstream KCSAN: data-race in __stop_tty / pty_write (4) serial 1 800d 800d 0/26 auto-closed as invalid on 2022/03/17 12:14
upstream KCSAN: data-race in __stop_tty / pty_write (3) serial 1 888d 888d 0/26 auto-closed as invalid on 2021/12/20 07:00
upstream KCSAN: data-race in __stop_tty / pty_write (5) serial 1 756d 756d 0/26 auto-closed as invalid on 2022/04/30 10:57
upstream KCSAN: data-race in __stop_tty / pty_write (10) serial 1 224d 224d 0/26 auto-obsoleted due to no activity on 2023/10/14 11:29
upstream KCSAN: data-race in __stop_tty / pty_write (11) serial 3 181d 184d 0/26 auto-obsoleted due to no activity on 2023/11/26 18:07
upstream KCSAN: data-race in __stop_tty / pty_write (12) serial 7 68d 129d 0/26 auto-obsoleted due to no activity on 2024/03/18 19:09
upstream KCSAN: data-race in __stop_tty / pty_write (7) serial 1 562d 562d 0/26 auto-obsoleted due to no activity on 2022/11/10 14:49

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

write to 0xffff88811e3391bc of 1 bytes by task 28644 on cpu 1:
 __stop_tty+0x42/0x90 drivers/tty/tty_io.c:753
 n_tty_ioctl_helper+0x223/0x240 drivers/tty/tty_ioctl.c:955
 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 0xffff88811e3391bc of 1 bytes by task 10 on cpu 0:
 pty_write+0x26/0xa0 drivers/tty/pty.c:115
 tty_put_char+0x8d/0xc0 drivers/tty/tty_io.c:3168
 n_tty_process_echo_ops drivers/tty/n_tty.c:663 [inline]
 __process_echoes+0x393/0x6b0 drivers/tty/n_tty.c:709
 flush_echoes drivers/tty/n_tty.c:807 [inline]
 __receive_buf drivers/tty/n_tty.c:1632 [inline]
 n_tty_receive_buf_common+0x8e6/0xbd0 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:3254 [inline]
 process_scheduled_works+0x465/0x990 kernel/workqueue.c:3335
 worker_thread+0x526/0x730 kernel/workqueue.c:3416
 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: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10 Comm: kworker/u8:0 Tainted: G        W          6.9.0-rc3-syzkaller-00286-g5939d45155bb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: events_unbound flush_to_ldisc
==================================================================

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/13 03:31 upstream 5939d45155bb c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __stop_tty / pty_write
2024/04/10 16:02 upstream 2c71fdf02a95 4320ec32 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __stop_tty / pty_write
2024/04/10 05:15 upstream 20cb38a7af88 171ec371 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __stop_tty / pty_write
2024/04/05 07:13 upstream c88b9b4cde17 0ee3535e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __stop_tty / pty_write
2024/03/31 08:57 upstream 712e14250dd2 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __stop_tty / pty_write
2024/03/29 22:57 upstream 4535e1a4174c c52bcb23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __stop_tty / pty_write
2024/03/27 01:27 upstream 7033999ecd7b 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __stop_tty / pty_write
2024/03/21 00:46 upstream dba89d1b81df 5b7d42ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __stop_tty / pty_write
2024/03/20 09:23 upstream a4145ce1e7bc a485f239 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __stop_tty / pty_write
* Struck through repros no longer work on HEAD.