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KCSAN: data-race in __process_echoes / n_tty_write (8)

Status: auto-obsoleted due to no activity on 2023/05/19 15:46
Subsystems: serial
[Documentation on labels]
First crash: 401d, last: 348d
Similar bugs (10)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __process_echoes / n_tty_write (9) serial 4 255d 301d 0/26 auto-obsoleted due to no activity on 2023/08/21 10:01
upstream KCSAN: data-race in __process_echoes / n_tty_write serial 3 1319d 1361d 0/26 auto-closed as invalid on 2020/09/20 17:41
upstream KCSAN: data-race in __process_echoes / n_tty_write (3) serial 7 1033d 1098d 0/26 auto-closed as invalid on 2021/07/04 10:36
upstream KCSAN: data-race in __process_echoes / n_tty_write (11) serial 12 3d18h 64d 0/26 moderation: reported on 2024/01/24 10:51
upstream KCSAN: data-race in __process_echoes / n_tty_write (10) serial 10 109d 109d 0/26 auto-obsoleted due to no activity on 2024/01/14 04:02
upstream KCSAN: data-race in __process_echoes / n_tty_write (4) serial 1 990d 990d 0/26 auto-closed as invalid on 2021/08/15 21:06
upstream KCSAN: data-race in __process_echoes / n_tty_write (6) serial 41 541d 837d 0/26 auto-obsoleted due to no activity on 2022/11/07 20:53
upstream KCSAN: data-race in __process_echoes / n_tty_write (2) serial 4 1187d 1207d 0/26 auto-closed as invalid on 2021/01/30 23:25
upstream KCSAN: data-race in __process_echoes / n_tty_write (7) serial 2 486d 486d 0/26 auto-obsoleted due to no activity on 2023/01/13 20:09
upstream KCSAN: data-race in __process_echoes / n_tty_write (5) serial 1 910d 910d 0/26 auto-closed as invalid on 2021/11/04 02:47

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __process_echoes / n_tty_write

write to 0xffffc90000eaf280 of 8 bytes by task 17618 on cpu 0:
 __process_echoes+0x5db/0x620 drivers/tty/n_tty.c:756
 flush_echoes drivers/tty/n_tty.c:817 [inline]
 __receive_buf drivers/tty/n_tty.c:1615 [inline]
 n_tty_receive_buf_common+0x8ff/0xb50 drivers/tty/n_tty.c:1711
 n_tty_receive_buf2+0x32/0x40 drivers/tty/n_tty.c:1746
 tty_ldisc_receive_buf+0x60/0xe0 drivers/tty/tty_buffer.c:457
 tty_port_default_receive_buf+0x58/0x80 drivers/tty/tty_port.c:39
 receive_buf drivers/tty/tty_buffer.c:515 [inline]
 flush_to_ldisc+0x1ca/0x400 drivers/tty/tty_buffer.c:565
 process_one_work+0x3e6/0x750 kernel/workqueue.c:2390
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2537
 kthread+0x1a6/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffffc90000eaf280 of 8 bytes by task 20399 on cpu 1:
 process_echoes drivers/tty/n_tty.c:794 [inline]
 n_tty_write+0x166/0xa80 drivers/tty/n_tty.c:2336
 do_tty_write drivers/tty/tty_io.c:1018 [inline]
 file_tty_write+0x3a0/0x600 drivers/tty/tty_io.c:1089
 tty_write+0x28/0x30 drivers/tty/tty_io.c:1110
 call_write_iter include/linux/fs.h:1851 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x463/0x760 fs/read_write.c:584
 ksys_write+0xeb/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x000000000000005e -> 0x0000000000000064

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20399 Comm: syz-executor.3 Not tainted 6.3.0-rc6-syzkaller-00138-g44149752e998 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
==================================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/04/14 15:40 upstream 44149752e998 ec410564 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __process_echoes / n_tty_write
2023/03/28 08:47 upstream 3a93e40326c8 47f3aaf1 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __process_echoes / n_tty_write
2023/02/20 17:20 upstream c9c3395d5e3d bcdf85f8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __process_echoes / n_tty_write
* Struck through repros no longer work on HEAD.