Hi Oleg, On 29.03.2021 20:38, Oleg Nesterov wrote:
Hi Igor, So. As expected, they sleep in EVENT_EXIT _after_ you have already sent SIGKILL.
Here is the processes stack before sending any signals to them: izh@suse2:~> sudo cat /proc/1751/stack [<0>] ptrace_stop+0x14e/0x260 [<0>] ptrace_do_notify+0x91/0xb0 [<0>] ptrace_notify+0x4e/0x70 [<0>] syscall_slow_exit_work+0x90/0x150 [<0>] do_syscall_64+0x129/0x1f0 [<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 izh@suse2:~> sudo cat /proc/1979/stack [<0>] ptrace_stop+0x14e/0x260 [<0>] get_signal+0x4d5/0x840 [<0>] do_signal+0x30/0x6a0 [<0>] exit_to_usermode_loop+0x8b/0x120 [<0>] do_syscall_64+0x1c3/0x1f0 [<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Igor, thanks for your report, but (I think) this has nothing to do with mutual debugging. I'll return to this problem in a couple of days, I'm a bit busy right now.
Sorry for inexact description. I said it from the user perspective when the processes are stopped and can't be killed. :-)
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