Hi, This one has so far happened only once on syzbot, probably it's either an extremely rare issue or was already solved. On Tue, Aug 30, 2022 at 7:37 PM Luiz Augusto von Dentz <luiz.dentz@xxxxxxxxx> wrote: > > Hi Lai, > > On Tue, Aug 30, 2022 at 7:08 AM Lai Jiangshan <jiangshanlai@xxxxxxxxx> wrote: > > > > CC: BLUETOOTH SUBSYSTEM > > > > It seems that hci_cmd_timeout() queues a work to a destroyed workqueue. > > Are there any traces or a way to reproduce the problem? You can take a look at the console log provided in the original bug report: console output: https://syzkaller.appspot.com/x/log.txt?x=120ebce7080000 Re. reproduction -- syzbot records a test error when it failed to do the following sequence of steps: 1) Boot a VM and establish an SSH connection to it 2) Upload fuzzer binaries 3) Start fuzzer binaries; these binaries will set up the fuzzing environment (networking devices, etc) 4) Execute a simple mmap program to check if coverage collection works fine mmap(0x1ffff000, 0x1000, 0x0, 0x32, 0xffffffffffffffff, 0x0) mmap(0x20000000, 0x1000000, 0x7, 0x32, 0xffffffffffffffff, 0x0) map(0x21000000, 0x1000, 0x0, 0x32, 0xffffffffffffffff, 0x0) It's probably easiest to start syzkaller locally on this exact kernel revision and see if the fuzzing is able to start. It will perform the same steps and report an error, if the issue persists. I've just tried to reproduce this particular bug myself on 4c612826bec1 and everything booted absolutely fine. So probably it was just a flake. FWIW syzbot can also perform patch testing for the reported bugs and output console logs, so it should also simplify the debugging of such bugs. More details are here: https://github.com/google/syzkaller/blob/master/docs/syzbot.md#testing-patches Patch testing can be done if there's a repro, I've just sent a PR (https://github.com/google/syzkaller/pull/3355) to add testing to the exception list -- we can retest that without a repro. Best Regards, Aleksandr > > -- > Luiz Augusto von Dentz > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/CABBYNZKNHnrgHfu8JN-kw5UqfEGUVWGyOwK_fLqHP5w8kPc2KA%40mail.gmail.com.
