bisecting fixing commit since 0f091e43310f5c292b7094f9f115e651358e8053 building syzkaller on d5a3ae1f760e7cb2cd5a721d9645ae22eae114fe testing commit 0f091e43310f5c292b7094f9f115e651358e8053 with gcc (GCC) 8.4.1 20210217 kernel signature: a98e028563c794949bf01c456c8e9e0b870e794739718df27c2ed1c3472e683e run #0: crashed: BUG: soft lockup in ext4_end_io_rsv_work run #1: crashed: BUG: soft lockup in linkwatch_event run #2: crashed: BUG: soft lockup in do_idle run #3: crashed: BUG: workqueue lockup run #4: crashed: BUG: soft lockup in do_idle run #5: crashed: BUG: soft lockup in do_idle run #6: crashed: BUG: soft lockup in rtnl_newlink run #7: crashed: BUG: soft lockup in rtnl_newlink run #8: crashed: BUG: soft lockup in do_idle run #9: crashed: BUG: soft lockup in linkwatch_event run #10: crashed: BUG: soft lockup in do_idle run #11: crashed: BUG: soft lockup in do_idle run #12: crashed: BUG: workqueue lockup run #13: crashed: BUG: soft lockup in do_idle run #14: crashed: BUG: soft lockup in do_idle run #15: crashed: BUG: soft lockup in do_idle run #16: crashed: BUG: soft lockup in addrconf_dad_work run #17: crashed: BUG: soft lockup in do_idle run #18: crashed: INFO: rcu detected stall in do_idle run #19: crashed: BUG: soft lockup in smp_call_function testing current HEAD d310ec03a34e92a77302edb804f7d68ee4f01ba0 testing commit d310ec03a34e92a77302edb804f7d68ee4f01ba0 with gcc (GCC) 10.2.1 20210217 kernel signature: d690078c1f6115545fd004f9bcf3f0b397e2f9d43607abb7ee23e8f972bb9269 run #0: crashed: BUG: soft lockup in do_idle run #1: crashed: BUG: soft lockup in mutex_spin_on_owner run #2: crashed: BUG: soft lockup in rtnl_newlink run #3: crashed: BUG: soft lockup in do_idle run #4: crashed: BUG: soft lockup in do_idle run #5: crashed: BUG: workqueue lockup run #6: crashed: BUG: soft lockup in do_idle run #7: crashed: BUG: soft lockup in do_idle run #8: crashed: BUG: soft lockup in do_idle run #9: crashed: BUG: soft lockup in do_idle revisions tested: 2, total time: 23m26.278936774s (build: 12m28.519609379s, test: 10m11.351484296s) the crash still happens on HEAD commit msg: Merge tag 'perf-core-2021-02-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip crash: BUG: soft lockup in do_idle watchdog: BUG: soft lockup - CPU#1 stuck for 47s! [swapper/1:0] Modules linked in: irq event stamp: 211372 hardirqs last enabled at (211371): [] acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline] hardirqs last enabled at (211371): [] acpi_idle_do_entry+0x157/0x290 drivers/acpi/processor_idle.c:516 hardirqs last disabled at (211372): [] sysvec_apic_timer_interrupt+0xc/0x100 arch/x86/kernel/apic/apic.c:1100 softirqs last enabled at (211348): [] asm_call_irq_on_stack+0xf/0x20 softirqs last disabled at (209019): [] asm_call_irq_on_stack+0xf/0x20 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:52 Code: e8 87 cb 36 fa e9 e4 fe ff ff 48 89 df e8 7a cb 36 fa eb 9c cc cc cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d d4 ce 5b 00 fb f4 90 e9 07 00 00 00 0f 00 2d c4 ce 5b 00 f4 c3 cc cc 55 53 e8 f9 RSP: 0018:ffffc9000010fd98 EFLAGS: 00000286 RAX: 1ffffffff126d671 RBX: ffff88810465a065 RCX: 1ffffffff1484039 RDX: dffffc0000000000 RSI: ffffffff87cb3920 RDI: ffffffff88128d80 RBP: ffff8881008563c0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffed102010ac78 R11: 0000000000000001 R12: 0000000000000001 R13: ffffffff89a75340 R14: ffff88810465a064 R15: ffff888109323004 FS: 0000000000000000(0000) GS:ffff8881f6300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000002b46848 CR3: 00000001167ed001 CR4: 00000000001706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:150 [inline] acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline] acpi_idle_do_entry+0x189/0x290 drivers/acpi/processor_idle.c:516 acpi_idle_enter+0x2d4/0x4a0 drivers/acpi/processor_idle.c:647 cpuidle_enter_state+0x145/0x990 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0x45/0xa0 drivers/cpuidle/cpuidle.c:351 call_cpuidle kernel/sched/idle.c:158 [inline] cpuidle_idle_call kernel/sched/idle.c:239 [inline] do_idle+0x48e/0x730 kernel/sched/idle.c:300 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:397 secondary_startup_64_no_verify+0xb0/0xbb