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KCSAN: data-race in __tty_hangup / tty_hung_up_p (10)

Status: auto-obsoleted due to no activity on 2023/07/13 04:28
Subsystems: serial
[Documentation on labels]
First crash: 972d, last: 926d
▶ ▼ Similar bugs (13)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __tty_hangup / tty_hung_up_p (4) serial 6 3 1669d 1715d 0/29 auto-closed as invalid on 2021/06/30 05:54
upstream KCSAN: data-race in __tty_hangup / tty_hung_up_p (8) serial 6 1 1436d 1436d 0/29 auto-closed as invalid on 2022/02/17 20:31
upstream KCSAN: data-race in __tty_hangup / tty_hung_up_p (14) serial 6 1 8d12h 8d12h 0/29 moderation: reported on 2025/12/12 04:08
upstream KCSAN: data-race in __tty_hangup / tty_hung_up_p (9) serial 6 1 1269d 1269d 0/29 auto-closed as invalid on 2022/08/03 23:21
upstream KCSAN: data-race in __tty_hangup / tty_hung_up_p (6) serial 6 1 1527d 1527d 0/29 auto-closed as invalid on 2021/11/19 04:32
upstream KCSAN: data-race in __tty_hangup / tty_hung_up_p serial 6 4 2191d 2210d 0/29 auto-closed as invalid on 2020/02/29 07:50
upstream KCSAN: data-race in __tty_hangup / tty_hung_up_p (11) serial 6 2 624d 634d 0/29 auto-obsoleted due to no activity on 2024/05/10 06:45
upstream KCSAN: data-race in __tty_hangup / tty_hung_up_p (3) serial 6 1 1779d 1779d 0/29 auto-closed as invalid on 2021/03/12 04:16
upstream KCSAN: data-race in __tty_hangup / tty_hung_up_p (7) serial 6 1 1486d 1486d 0/29 auto-closed as invalid on 2021/12/30 10:24
upstream KCSAN: data-race in __tty_hangup / tty_hung_up_p (13) serial 6 1 106d 106d 0/29 auto-obsoleted due to no activity on 2025/10/31 11:41
upstream KCSAN: data-race in __tty_hangup / tty_hung_up_p (12) serial 6 1 395d 395d 0/29 auto-obsoleted due to no activity on 2025/01/15 07:11
upstream KCSAN: data-race in __tty_hangup / tty_hung_up_p (5) serial 6 1 1617d 1617d 0/29 auto-closed as invalid on 2021/08/21 03:58
upstream KCSAN: data-race in __tty_hangup / tty_hung_up_p (2) serial 6 1 1961d 1961d 0/29 auto-closed as invalid on 2020/09/11 06:18

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __tty_hangup / tty_hung_up_p

write to 0xffff88813c2e9e28 of 8 bytes by task 7814 on cpu 0:
 __tty_hangup+0x1e2/0x510 drivers/tty/tty_io.c:622
 tty_vhangup drivers/tty/tty_io.c:701 [inline]
 tty_ioctl+0x604/0xbc0 drivers/tty/tty_io.c:2717
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xc9/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:856
 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

read to 0xffff88813c2e9e28 of 8 bytes by task 7819 on cpu 1:
 tty_hung_up_p+0x20/0x40 drivers/tty/tty_io.c:746
 n_tty_write+0x2dc/0xa80 drivers/tty/n_tty.c:2343
 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
 do_iter_write+0x4ae/0x770 fs/read_write.c:860
 vfs_writev+0x1a2/0x310 fs/read_write.c:933
 do_writev+0xf8/0x220 fs/read_write.c:976
 __do_sys_writev fs/read_write.c:1049 [inline]
 __se_sys_writev fs/read_write.c:1046 [inline]
 __x64_sys_writev+0x45/0x50 fs/read_write.c:1046
 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: 0xffffffff84e92a30 -> 0xffffffff84e928c0

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7819 Comm: syz-executor.3 Not tainted 6.4.0-rc5-syzkaller-00017-ga27648c74210 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
==================================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/08 04:18 upstream a27648c74210 058b3a5a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __tty_hangup / tty_hung_up_p
2023/05/19 00:14 upstream 2d1bcbc6cd70 3bb7af1d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __tty_hangup / tty_hung_up_p
2023/04/23 00:51 upstream 2caeeb9d4a1b 2b32bd34 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __tty_hangup / tty_hung_up_p
* Struck through repros no longer work on HEAD.