Messages in this thread | | | Date | Tue, 17 Dec 2019 12:43:08 -0800 | Subject | KCSAN: data-race in poll_schedule_timeout.constprop.0 / pollwake (3) | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: 245a4300 Merge branch 'rcu/kcsan' into tip/locking/kcsan git tree: https://github.com/google/ktsan.git kcsan console output: https://syzkaller.appspot.com/x/log.txt?x=11beba8ee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=a38292766f8efdaa dashboard link: https://syzkaller.appspot.com/bug?extid=9b3fb64bcc8c1d807595 compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+9b3fb64bcc8c1d807595@syzkaller.appspotmail.com
================================================================== BUG: KCSAN: data-race in poll_schedule_timeout.constprop.0 / pollwake
write to 0xffffc90001043c30 of 4 bytes by task 17695 on cpu 0: __pollwake fs/select.c:197 [inline] pollwake+0xe3/0x140 fs/select.c:217 __wake_up_common+0x7b/0x180 kernel/sched/wait.c:93 __wake_up_common_lock+0x77/0xb0 kernel/sched/wait.c:123 __wake_up+0xe/0x10 kernel/sched/wait.c:142 signalfd_notify include/linux/signalfd.h:22 [inline] signalfd_notify include/linux/signalfd.h:19 [inline] __send_signal+0x70e/0x870 kernel/signal.c:1158 send_signal+0x224/0x2b0 kernel/signal.c:1236 __group_send_sig_info kernel/signal.c:1275 [inline] do_notify_parent+0x55b/0x5e0 kernel/signal.c:1992 exit_notify kernel/exit.c:670 [inline] do_exit+0x16ef/0x18c0 kernel/exit.c:818 do_group_exit+0xb4/0x1c0 kernel/exit.c:895 __do_sys_exit_group kernel/exit.c:906 [inline] __se_sys_exit_group kernel/exit.c:904 [inline] __x64_sys_exit_group+0x2e/0x30 kernel/exit.c:904 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9
read to 0xffffc90001043c30 of 4 bytes by task 15995 on cpu 1: poll_schedule_timeout.constprop.0+0x50/0xc0 fs/select.c:242 do_poll fs/select.c:951 [inline] do_sys_poll+0x66d/0x990 fs/select.c:1001 __do_sys_poll fs/select.c:1059 [inline] __se_sys_poll fs/select.c:1047 [inline] __x64_sys_poll+0x10f/0x250 fs/select.c:1047 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9
Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 15995 Comm: udevd Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================
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