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================================================================== BUG: KCSAN: data-race in ppp_asynctty_receive / tty_set_termios write to 0xffff88800b313910 of 4 bytes by task 20198 on cpu 1: unset_locked_termios drivers/tty/tty_ioctl.c:251 [inline] tty_set_termios+0xf1/0x8a0 drivers/tty/tty_ioctl.c:331 set_termios+0x375/0x3b0 drivers/tty/tty_ioctl.c:414 tty_mode_ioctl+0x573/0x670 drivers/tty/tty_ioctl.c:725 ppp_asynctty_ioctl+0x229/0x300 drivers/net/ppp/ppp_async.c:326 tty_ioctl+0xa97/0x10c0 drivers/tty/tty_io.c:2810 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:739 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88800b313910 of 4 bytes by task 59 on cpu 0: ppp_async_input drivers/net/ppp/ppp_async.c:912 [inline] ppp_asynctty_receive+0x760/0xdb0 drivers/net/ppp/ppp_async.c:351 tty_ldisc_receive_buf+0xc6/0xf0 drivers/tty/tty_buffer.c:465 tty_port_default_receive_buf+0x54/0x80 drivers/tty/tty_port.c:38 receive_buf drivers/tty/tty_buffer.c:481 [inline] flush_to_ldisc+0x1c5/0x2c0 drivers/tty/tty_buffer.c:533 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275 worker_thread+0x616/0xa70 kernel/workqueue.c:2421 kthread+0x20b/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 59 Comm: kworker/u4:2 Not tainted 5.12.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound flush_to_ldisc ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2021/04/06 21:15 | upstream | 2d743660786e | 6a81331a | .config | console log | report | info | ci2-upstream-kcsan-gce | KCSAN: data-race in ppp_asynctty_receive / tty_set_termios |