bisecting fixing commit since 7cc2a8ea104820dd9e702202621e8fd4d9f6c8cf
building syzkaller on 510951950dc0ee69cfdaf746061d3dbe31b49fd8
testing commit 7cc2a8ea104820dd9e702202621e8fd4d9f6c8cf with gcc (GCC) 8.1.0
kernel signature: 9b296c2c0897534d1c5e38cdfda56b941c35f7bd393ed5a8d5710bc76f2da97b
run #0: crashed: INFO: rcu detected stall in do_signal
run #1: crashed: INFO: rcu detected stall in corrupted
run #2: crashed: INFO: rcu detected stall in do_signal
run #3: crashed: INFO: rcu detected stall in do_signal
run #4: crashed: INFO: task hung in lru_add_drain_all
run #5: crashed: INFO: rcu detected stall in sys_mount
run #6: crashed: INFO: rcu detected stall in sys_mount
run #7: crashed: INFO: task hung in switchdev_deferred_process_work
run #8: OK
run #9: OK
testing current HEAD 713eee84720e6525bc5b65954c5087604a15f5e8
testing commit 713eee84720e6525bc5b65954c5087604a15f5e8 with gcc (GCC) 8.1.0
kernel signature: 2090ffcaaab8cc292959ab43581205e38d13e070ef8d4f3acf2ef83896e3434e
run #0: crashed: INFO: rcu detected stall in sys_mount
run #1: crashed: INFO: rcu detected stall in sys_mount
run #2: crashed: INFO: rcu detected stall in sys_mount
run #3: crashed: INFO: task hung in lru_add_drain_all
run #4: crashed: INFO: rcu detected stall in corrupted
run #5: crashed: INFO: task hung in lru_add_drain_all
run #6: crashed: INFO: task hung in lru_add_drain_all
run #7: crashed: BUG: workqueue lockup
run #8: crashed: INFO: rcu detected stall in sys_close
run #9: crashed: INFO: rcu detected stall in corrupted
revisions tested: 2, total time: 29m13.48613299s (build: 9m44.737074194s, test: 19m1.131908826s)
the crash still happens on HEAD
commit msg: Merge tag 'perf-tools-2020-08-14' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux
crash: INFO: rcu detected stall in corrupted
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-....: (1 GPs behind) idle=1ba/1/0x4000000000000000 softirq=129041/129042 fqs=4613
(t=10500 jiffies g=54565 q=1172699)
NMI backtrace for cpu 1
CPU: 1 PID: 21752 Comm: syz-executor.1 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xb3/0xec lib/dump_stack.c:118
nmi_cpu_backtrace.cold.8+0x3e/0x58 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0xd5/0xec lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0xa2/0xce kernel/rcu/tree_stall.h:318
print_cpu_stall kernel/rcu/tree_stall.h:551 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
rcu_pending kernel/rcu/tree.c:3637 [inline]
rcu_sched_clock_irq.cold.94+0x61/0x52d kernel/rcu/tree.c:2519
update_process_times+0x1f/0x60 kernel/time/timer.c:1710
tick_sched_handle.isra.23+0x1a/0x50 kernel/time/tick-sched.c:176
tick_sched_timer+0x6c/0x80 kernel/time/tick-sched.c:1328
__run_hrtimer kernel/time/hrtimer.c:1524 [inline]
__hrtimer_run_queues+0x1e1/0x510 kernel/time/hrtimer.c:1588
hrtimer_interrupt+0xf9/0x210 kernel/time/hrtimer.c:1650
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
__sysvec_apic_timer_interrupt+0x8e/0x2b0 arch/x86/kernel/apic/apic.c:1097
asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
__run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
sysvec_apic_timer_interrupt+0xc1/0xe0 arch/x86/kernel/apic/apic.c:1091
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x30/0x50 kernel/locking/spinlock.c:199
Code: 48 89 fb 48 83 c7 18 e8 ae 83 1f fe 48 89 df e8 76 e0 1f fe e8 c1 d5 29 fe 48 83 3d 91 c6 28 01 00 74 25 fb 66 0f 1f 44 00 00 01 00 00 00 e8 06 24 1c fe 65 8b 05 bf a9 fd 7c 85 c0 74 02 5b
RSP: 0000:ffffc90001837e28 EFLAGS: 00000282
RAX: 0000000020c3e8df RBX: ffff88811119cac0 RCX: ffffc90001837dec
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8303d49f
RBP: ffffc90001837e80 R08: 0000000000000001 R09: 0000000000000001
R10: 000000000000000b R11: aeaab19fbcf58636 R12: ffffc90001837e01
R13: ffffc90001837ea0 R14: ffff88811119cac0 R15: 000000000000000b
spin_unlock_irq include/linux/spinlock.h:404 [inline]
get_signal+0xa8a/0xcb0 kernel/signal.c:2746
arch_do_signal+0x2b/0x920 arch/x86/kernel/signal.c:811
exit_to_user_mode_loop kernel/entry/common.c:135 [inline]
exit_to_user_mode_prepare+0x181/0x1f0 kernel/entry/common.c:166
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:254
asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538
RIP: 0033:0x0
Code: Bad RIP value.
RSP: 002b:00007f8691a34a70 EFLAGS: 00010287
RAX: 0000000000000001 RBX: 000000000050a5e0 RCX: 000000000045cba9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007f8691a35608
RBP: 000000000078bf00 R08: 00007f8691a34a70 R09: 000000000078bf00
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000c3b R14: 00000000004ce958 R15: 00007f8691a356d4