bisecting fixing commit since ae4b064e2a616b545acf02b8f50cc513b32c7522 building syzkaller on 08003f6440deafc4e193b159c4acece64f7864b1 testing commit ae4b064e2a616b545acf02b8f50cc513b32c7522 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 79450ac766e6ee1c6d674c4246108ce8e17a02768744d4e7b53c5a30c04b9f53 run #0: crashed: BUG: workqueue lockup run #1: crashed: BUG: workqueue lockup run #2: crashed: BUG: workqueue lockup run #3: crashed: BUG: workqueue lockup run #4: crashed: BUG: workqueue lockup run #5: crashed: BUG: workqueue lockup run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in chrdev_open run #9: crashed: INFO: rcu detected stall in chrdev_open run #10: crashed: INFO: rcu detected stall in corrupted run #11: crashed: INFO: rcu detected stall in chrdev_open run #12: crashed: INFO: rcu detected stall in chrdev_open run #13: crashed: INFO: rcu detected stall in chrdev_open run #14: crashed: INFO: rcu detected stall in corrupted run #15: crashed: INFO: rcu detected stall in chrdev_open run #16: crashed: INFO: rcu detected stall in chrdev_open run #17: crashed: INFO: rcu detected stall in corrupted run #18: crashed: INFO: rcu detected stall in chrdev_open run #19: crashed: BUG: workqueue lockup testing current HEAD 9e9fb7655ed585da8f468e29221f0ba194a5f613 testing commit 9e9fb7655ed585da8f468e29221f0ba194a5f613 arch/x86/kernel/setup.c:916:6: error: implicit declaration of function 'acpi_mps_check' [-Werror=implicit-function-declaration] arch/x86/kernel/setup.c:1110:2: error: implicit declaration of function 'acpi_table_upgrade' [-Werror=implicit-function-declaration] arch/x86/kernel/setup.c:1112:2: error: implicit declaration of function 'acpi_boot_table_init' [-Werror=implicit-function-declaration] arch/x86/kernel/setup.c:1120:2: error: implicit declaration of function 'early_acpi_boot_init'; did you mean 'early_cpu_init'? [-Werror=implicit-function-declaration] arch/x86/kernel/setup.c:1162:2: error: implicit declaration of function 'acpi_boot_init' [-Werror=implicit-function-declaration] revisions tested: 1, total time: 17m16.2561622s (build: 10m9.992496137s, test: 6m0.52148369s) bisection is inconclusive, the first good commit could be any of: ae4b064e2a616b545acf02b8f50cc513b32c7522 9e9fb7655ed585da8f468e29221f0ba194a5f613