bisecting fixing commit since 4fa640dc52302b5e62b01b05c755b055549633ae building syzkaller on d88894e6773ab63ac8b3f4b2edbae88290aaf0d6 testing commit 4fa640dc52302b5e62b01b05c755b055549633ae with gcc (GCC) 8.4.1 20210217 kernel signature: 01ec0811025845132e25eee53b8aad732d2001a20ac9fec49e0d1dea11407386 run #0: crashed: BUG: soft lockup in do_idle run #1: crashed: BUG: workqueue lockup run #2: crashed: BUG: soft lockup in smp_call_function run #3: crashed: BUG: soft lockup in do_idle 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 neigh_periodic_work run #7: crashed: BUG: soft lockup in do_idle run #8: crashed: BUG: soft lockup in rtnl_newlink run #9: crashed: BUG: soft lockup in do_idle run #10: crashed: BUG: soft lockup in newfstat run #11: crashed: BUG: soft lockup in do_idle run #12: crashed: BUG: soft lockup in corrupted run #13: crashed: BUG: workqueue lockup run #14: crashed: BUG: soft lockup in do_symlinkat run #15: crashed: BUG: soft lockup in do_idle run #16: crashed: BUG: soft lockup in tun_chr_close run #17: crashed: BUG: soft lockup in do_idle run #18: crashed: BUG: soft lockup in tun_chr_close run #19: crashed: BUG: soft lockup in wb_workfn testing current HEAD c2131f7e73c9e9365613e323d65c7b9e5b910f56 testing commit c2131f7e73c9e9365613e323d65c7b9e5b910f56 with gcc (GCC) 10.2.1 20210217 kernel signature: 766f2814d7201402696dcc40a491010f29fa36d5fd064007946db4413cb273db run #0: crashed: BUG: soft lockup in do_idle run #1: crashed: BUG: soft lockup in wb_workfn run #2: crashed: BUG: workqueue lockup run #3: crashed: BUG: soft lockup in linkwatch_event run #4: crashed: BUG: workqueue lockup run #5: crashed: BUG: soft lockup in wb_workfn run #6: crashed: BUG: soft lockup in do_idle run #7: crashed: BUG: soft lockup in tc_modify_qdisc run #8: crashed: BUG: soft lockup in do_idle run #9: crashed: BUG: soft lockup in do_idle revisions tested: 2, total time: 24m43.294866864s (build: 13m31.233723264s, test: 10m15.341641299s) the crash still happens on HEAD commit msg: Merge tag 'gfs2-v5.13-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2 crash: BUG: soft lockup in do_idle hrtimer: interrupt took 22988733 ns watchdog: BUG: soft lockup - CPU#1 stuck for 103s! [swapper/1:0] Modules linked in: irq event stamp: 150284 hardirqs last enabled at (150283): [] acpi_safe_halt drivers/acpi/processor_idle.c:108 [inline] hardirqs last enabled at (150283): [] acpi_idle_do_entry+0x157/0x290 drivers/acpi/processor_idle.c:513 hardirqs last disabled at (150284): [] sysvec_apic_timer_interrupt+0xb/0xc0 arch/x86/kernel/apic/apic.c:1100 softirqs last enabled at (150248): [] invoke_softirq kernel/softirq.c:433 [inline] softirqs last enabled at (150248): [] __irq_exit_rcu kernel/softirq.c:637 [inline] softirqs last enabled at (150248): [] irq_exit_rcu+0x250/0x2a0 kernel/softirq.c:649 softirqs last disabled at (150237): [] invoke_softirq kernel/softirq.c:433 [inline] softirqs last disabled at (150237): [] __irq_exit_rcu kernel/softirq.c:637 [inline] softirqs last disabled at (150237): [] irq_exit_rcu+0x250/0x2a0 kernel/softirq.c:649 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.13.0-rc4-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 37 35 2e fa e9 e4 fe ff ff 48 89 df e8 2a 35 2e fa eb 9c cc cc cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d f4 87 50 00 fb f4 90 e9 07 00 00 00 0f 00 2d e4 87 50 00 f4 c3 cc cc 55 53 e8 89 RSP: 0018:ffffc9000010fd98 EFLAGS: 00000286 RAX: 1ffffffff126e861 RBX: ffff888104926065 RCX: 1ffffffff14884d1 RDX: dffffc0000000000 RSI: ffffffff87cb42c0 RDI: ffffffff881346e0 RBP: ffff8881008523c0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffed102010a478 R11: 0000000000000001 R12: 0000000000000001 R13: ffffffff89a8bdc0 R14: ffff888104926064 R15: ffff888109b14004 FS: 0000000000000000(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000563c627cc8d0 CR3: 0000000120960002 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:167 [inline] acpi_safe_halt drivers/acpi/processor_idle.c:108 [inline] acpi_idle_do_entry+0x189/0x290 drivers/acpi/processor_idle.c:513 acpi_idle_enter+0x2d4/0x4a0 drivers/acpi/processor_idle.c:648 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+0x497/0x730 kernel/sched/idle.c:306 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403 secondary_startup_64_no_verify+0xb0/0xbb