bisecting fixing commit since fc3abb53250a90ba2150eebd182137c136f4d25a
building syzkaller on abf9ba4fc75d9b29af15625d44dcfc1360fad3b7
testing commit fc3abb53250a90ba2150eebd182137c136f4d25a with gcc (GCC) 8.4.1 20210217
kernel signature: 2d171b5e99cc1e86f328ad10335be5d24c0cdee9cf72ab9f90479e8592770217
run #0: crashed: BUG: soft lockup in addrconf_dad_work
run #1: crashed: BUG: soft lockup in do_idle
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 batadv_nc_worker
run #5: crashed: BUG: soft lockup in do_idle
run #6: crashed: BUG: soft lockup in addrconf_dad_work
run #7: crashed: BUG: soft lockup in addrconf_dad_work
run #8: crashed: BUG: soft lockup in do_idle
run #9: crashed: BUG: soft lockup in do_idle
run #10: crashed: BUG: soft lockup in do_idle
run #11: crashed: BUG: workqueue lockup
run #12: crashed: BUG: soft lockup in do_idle
run #13: crashed: BUG: soft lockup in wb_workfn
run #14: crashed: BUG: soft lockup in rtnl_newlink
run #15: crashed: BUG: soft lockup in do_idle
run #16: crashed: BUG: soft lockup in addrconf_dad_work
run #17: crashed: BUG: workqueue lockup
run #18: crashed: BUG: soft lockup in do_idle
run #19: crashed: BUG: soft lockup in do_idle
testing current HEAD fe07bfda2fb9cdef8a4d4008a409bb02f35f1bd8
testing commit fe07bfda2fb9cdef8a4d4008a409bb02f35f1bd8 with gcc (GCC) 10.2.1 20210217
kernel signature: 64416024d68a63dda0622e0afe02c55af77e8828c81eca50c4b72e461542f161
run #0: crashed: BUG: workqueue lockup
run #1: crashed: BUG: soft lockup in do_idle
run #2: crashed: BUG: soft lockup in do_idle
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 rtnl_newlink
run #7: crashed: BUG: soft lockup in do_idle
run #8: crashed: BUG: soft lockup in mutex_spin_on_owner
run #9: crashed: BUG: soft lockup in do_idle
revisions tested: 2, total time: 24m14.423539872s (build: 12m38.098972717s, test: 10m56.988484116s)
the crash still happens on HEAD
commit msg: Linux 5.12-rc1
crash: BUG: soft lockup in do_idle
watchdog: BUG: soft lockup - CPU#1 stuck for 24s! [swapper/1:0]
Modules linked in:
irq event stamp: 181324
hardirqs last  enabled at (181323): [<ffffffff876e31a7>] acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline]
hardirqs last  enabled at (181323): [<ffffffff876e31a7>] acpi_idle_do_entry+0x157/0x290 drivers/acpi/processor_idle.c:516
hardirqs last disabled at (181324): [<ffffffff876be30b>] sysvec_apic_timer_interrupt+0xb/0xc0 arch/x86/kernel/apic/apic.c:1100
softirqs last  enabled at (181312): [<ffffffff814118a7>] invoke_softirq kernel/softirq.c:221 [inline]
softirqs last  enabled at (181312): [<ffffffff814118a7>] __irq_exit_rcu kernel/softirq.c:422 [inline]
softirqs last  enabled at (181312): [<ffffffff814118a7>] irq_exit_rcu+0x237/0x280 kernel/softirq.c:434
softirqs last disabled at (171237): [<ffffffff814118a7>] invoke_softirq kernel/softirq.c:221 [inline]
softirqs last disabled at (171237): [<ffffffff814118a7>] __irq_exit_rcu kernel/softirq.c:422 [inline]
softirqs last disabled at (171237): [<ffffffff814118a7>] irq_exit_rcu+0x237/0x280 kernel/softirq.c:434
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.12.0-rc1-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 77 10 36 fa e9 e4 fe ff ff 48 89 df e8 6a 10 36 fa eb 9c cc cc cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d e4 2b 5a 00 fb f4 <c3> 90 e9 07 00 00 00 0f 00 2d d4 2b 5a 00 f4 c3 cc cc 55 53 e8 09
RSP: 0018:ffffc9000010fd98 EFLAGS: 00000282
RAX: 1ffffffff126df21 RBX: ffff8881040af065 RCX: 1ffffffff1486191
RDX: dffffc0000000000 RSI: ffffffff87cb2840 RDI: ffffffff88128040
RBP: ffff8881008503c0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffed102010a078 R11: 0000000000000001 R12: 0000000000000001
R13: ffffffff89a79620 R14: ffff8881040af064 R15: ffff888109432004
FS:  0000000000000000(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005595065988f8 CR3: 000000011c71e000 CR4: 0000000000350ee0
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