bisecting fixing commit since fc3abb53250a90ba2150eebd182137c136f4d25a
building syzkaller on abf9ba4fc75d9b29af15625d44dcfc1360fad3b7
testing commit fc3abb53250a90ba2150eebd182137c136f4d25a
compiler: gcc (GCC) 8.4.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.1
kernel signature: 2d171b5e99cc1e86f328ad10335be5d24c0cdee9cf72ab9f90479e8592770217
run #0: crashed: BUG: soft lockup in do_idle
run #1: crashed: BUG: soft lockup in tc_modify_qdisc
run #2: crashed: BUG: soft lockup in do_idle
run #3: crashed: BUG: soft lockup in tc_modify_qdisc
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 mutex_spin_on_owner
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 rtnl_newlink
run #10: crashed: BUG: soft lockup in do_idle
run #11: crashed: BUG: soft lockup in ext4_end_io_rsv_work
run #12: crashed: BUG: soft lockup in do_idle
run #13: crashed: BUG: soft lockup in ipv6_rcv
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 do_idle
run #17: crashed: BUG: soft lockup in do_idle
run #18: crashed: BUG: soft lockup in free_work
run #19: crashed: BUG: soft lockup in do_idle
testing current HEAD c500bee1c5b2f1d59b1081ac879d73268ab0ff17
testing commit c500bee1c5b2f1d59b1081ac879d73268ab0ff17
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.1
kernel signature: f8d5ec53bab2c7fc22def9cd4fbc7121b738da64674467ad9b948cf53d618695
run #0: crashed: BUG: soft lockup in tc_modify_qdisc
run #1: crashed: BUG: soft lockup in batadv_nc_worker
run #2: crashed: BUG: soft lockup in ext4_end_io_rsv_work
run #3: crashed: BUG: soft lockup in net_tx_action
run #4: crashed: BUG: soft lockup in do_idle
run #5: crashed: BUG: soft lockup in net_tx_action
run #6: crashed: BUG: soft lockup in do_idle
run #7: crashed: BUG: soft lockup in process_srcu
run #8: crashed: BUG: soft lockup in do_idle
run #9: crashed: BUG: soft lockup in do_idle
revisions tested: 2, total time: 22m5.609091731s (build: 11m30.044640357s, test: 9m49.116135419s)
the crash still happens on HEAD
commit msg: Linux 5.14-rc4
crash: BUG: soft lockup in do_idle
watchdog: BUG: soft lockup - CPU#1 stuck for 38s! [swapper/1:0]
Modules linked in:
irq event stamp: 219828
hardirqs last  enabled at (219827): [<ffffffff878b6047>] acpi_safe_halt drivers/acpi/processor_idle.c:109 [inline]
hardirqs last  enabled at (219827): [<ffffffff878b6047>] acpi_idle_do_entry+0x157/0x290 drivers/acpi/processor_idle.c:553
hardirqs last disabled at (219828): [<ffffffff8788e03b>] sysvec_apic_timer_interrupt+0xb/0xc0 arch/x86/kernel/apic/apic.c:1100
softirqs last  enabled at (219792): [<ffffffff81420559>] invoke_softirq kernel/softirq.c:432 [inline]
softirqs last  enabled at (219792): [<ffffffff81420559>] __irq_exit_rcu kernel/softirq.c:636 [inline]
softirqs last  enabled at (219792): [<ffffffff81420559>] irq_exit_rcu+0x229/0x270 kernel/softirq.c:648
softirqs last disabled at (215909): [<ffffffff81420559>] invoke_softirq kernel/softirq.c:432 [inline]
softirqs last disabled at (215909): [<ffffffff81420559>] __irq_exit_rcu kernel/softirq.c:636 [inline]
softirqs last disabled at (215909): [<ffffffff81420559>] irq_exit_rcu+0x229/0x270 kernel/softirq.c:648
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:native_safe_halt+0xb/0x10 arch/x86/include/asm/irqflags.h:52
Code: e8 aa 54 1c fa e9 e7 fe ff ff 48 89 df e8 9d 54 1c fa eb 9c cc cc cc cc cc cc cc cc cc cc cc eb 07 0f 00 2d 67 32 5d 00 fb f4 <c3> 0f 1f 40 00 eb 07 0f 00 2d 57 32 5d 00 f4 c3 cc cc cc cc cc 55
RSP: 0018:ffffc9000030fd98 EFLAGS: 00000282
RAX: 1ffffffff12aea91 RBX: ffff888104a92865 RCX: 1ffffffff14cd219
RDX: dffffc0000000000 RSI: ffffffff87eb6120 RDI: ffffffff8833f160
RBP: ffff888100a143c0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffed1020142878 R11: 0000000000000001 R12: 0000000000000001
R13: ffffffff89c9c0a0 R14: ffff888104a92864 R15: ffff888109d2d004
FS:  0000000000000000(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f10c203c000 CR3: 000000011d2e3000 CR4: 0000000000350ee0
Call Trace:
 arch_safe_halt arch/x86/include/asm/paravirt.h:167 [inline]
 acpi_safe_halt drivers/acpi/processor_idle.c:109 [inline]
 acpi_idle_do_entry+0x189/0x290 drivers/acpi/processor_idle.c:553
 acpi_idle_enter+0x2d4/0x4a0 drivers/acpi/processor_idle.c:688
 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