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Message-ID: <0000000000009ce9ee057b0be7f8@google.com>
Date:   Mon, 19 Nov 2018 14:19:04 -0800
From:   syzbot <syzbot+20fddccabc274e99398e@...kaller.appspotmail.com>
To:     andy.shevchenko@...il.com, bp@...en8.de, douly.fnst@...fujitsu.com,
        hpa@...or.com, konrad.wilk@...cle.com, len.brown@...el.com,
        linux-kernel@...r.kernel.org, mingo@...hat.com, puwen@...on.cn,
        rppt@...ux.vnet.ibm.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, ville.syrjala@...ux.intel.com, x86@...nel.org
Subject: WARNING in update_load_avg

Hello,

syzbot found the following crash on:

HEAD commit:    cddaf02bcb73 tg3: optionally use eth_platform_get_mac_addr..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15810d33400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d86f24333880b605
dashboard link: https://syzkaller.appspot.com/bug?extid=20fddccabc274e99398e
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10272c5d400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=157bd093400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+20fddccabc274e99398e@...kaller.appspotmail.com

IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
8021q: adding VLAN 0 to HW filter on device team0
syz-executor496 (6238) used greatest stack depth: 15648 bytes left
WARNING: CPU: 1 PID: 0 at kernel/sched/sched.h:1015 rq_clock_task  
kernel/sched/sched.h:1015 [inline]
WARNING: CPU: 1 PID: 0 at kernel/sched/sched.h:1015 cfs_rq_clock_task  
kernel/sched/fair.c:4283 [inline]
WARNING: CPU: 1 PID: 0 at kernel/sched/sched.h:1015  
update_load_avg+0x1539/0x2470 kernel/sched/fair.c:3492
==================================================================
BUG: KASAN: stack-out-of-bounds in lookup_object lib/debugobjects.c:157  
[inline]
BUG: KASAN: stack-out-of-bounds in debug_object_deactivate+0x3a8/0x450  
lib/debugobjects.c:543
Kernel panic - not syncing: panic_on_warn set ...
Read of size 8 at addr ffff8881dae000e0 by task syz-executor496/6371
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.20.0-rc2+ #302

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  <IRQ>
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x244/0x39d lib/dump_stack.c:113
  panic+0x2ad/0x55c kernel/panic.c:188
  __warn.cold.8+0x20/0x45 kernel/panic.c:540
  report_bug+0x254/0x2d0 lib/bug.c:186
  fixup_bug arch/x86/kernel/traps.c:178 [inline]
  do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
  do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
  invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
RIP: 0010:rq_clock_task kernel/sched/sched.h:1015 [inline]
RIP: 0010:cfs_rq_clock_task kernel/sched/fair.c:4283 [inline]
RIP: 0010:update_load_avg+0x1539/0x2470 kernel/sched/fair.c:3492
Code: e8 fc e1 69 00 e9 8b f8 ff ff 48 8d 7a 18 be ff ff ff ff 48 89 95 30  
fb ff ff e8 52 e5 07 00 48 8b 95 30 fb ff ff 85 c0 75 29 <0f> 0b 48 b8 00  
00 00 00 00 fc ff df 4c 89 f9 48 c1 e9 03 80 3c 01
RSP: 0018:ffff8881daf07238 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8881b3b487c0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000086
RBP: ffff8881daf07750 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8881daf2d850 R12: ffff8881bf344bc0
R13: ffff8881daf07728 R14: 0000000000000000 R15: ffff8881b3b48930
  update_blocked_averages+0xcc7/0x1e00 kernel/sched/fair.c:7401
  run_rebalance_domains+0x37c/0x500 kernel/sched/fair.c:9696
  __do_softirq+0x308/0xb7e kernel/softirq.c:292
  invoke_softirq kernel/softirq.c:373 [inline]
  irq_exit+0x17f/0x1c0 kernel/softirq.c:413
  exiting_irq arch/x86/include/asm/apic.h:536 [inline]
  smp_apic_timer_interrupt+0x1cb/0x760 arch/x86/kernel/apic/apic.c:1061
  apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804
  </IRQ>
RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:57
Code: e9 2c ff ff ff 48 89 c7 48 89 45 d8 e8 33 22 e6 f9 48 8b 45 d8 e9 ca  
fe ff ff 48 89 df e8 22 22 e6 f9 eb 82 55 48 89 e5 fb f4 <5d> c3 0f 1f 84  
00 00 00 00 00 55 48 89 e5 f4 5d c3 90 90 90 90 90
RSP: 0018:ffff8881d9b27cb8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: 1ffff1103b364f9b RCX: 0000000000000000
RDX: 1ffffffff12a3f71 RSI: 0000000000000001 RDI: ffffffff8951fb88
RBP: ffff8881d9b27cb8 R08: ffff8881d9b14340 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881d9b27d78
R13: ffffffff8a1640e0 R14: 0000000000000000 R15: 0000000000000001
  arch_safe_halt arch/x86/include/asm/paravirt.h:151 [inline]
  default_idle+0xbf/0x490 arch/x86/kernel/process.c:498
  arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:489
  default_idle_call+0x6d/0x90 kernel/sched/idle.c:93
  cpuidle_idle_call kernel/sched/idle.c:153 [inline]
  do_idle+0x49b/0x5c0 kernel/sched/idle.c:262
  cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:353
  start_secondary+0x487/0x5f0 arch/x86/kernel/smpboot.c:271
  secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
CPU: 0 PID: 6371 Comm: syz-executor496 Not tainted 4.20.0-rc2+ #302

======================================================
WARNING: possible circular locking dependency detected
4.20.0-rc2+ #302 Not tainted
------------------------------------------------------
swapper/1/0 is trying to acquire lock:
00000000cee8b2f6 ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70  
kernel/locking/semaphore.c:136

but task is already holding lock:
000000008d358a10 (&rq->lock){-.-.}, at: rq_lock_irqsave  
kernel/sched/sched.h:1110 [inline]
000000008d358a10 (&rq->lock){-.-.}, at:  
update_blocked_averages+0x156/0x1e00 kernel/sched/fair.c:7381

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&rq->lock){-.-.}:
        __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
        _raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:144
        rq_lock kernel/sched/sched.h:1126 [inline]
        task_fork_fair+0xb0/0x6d0 kernel/sched/fair.c:9768
        sched_fork+0x443/0xba0 kernel/sched/core.c:2359
        copy_process+0x25b8/0x87a0 kernel/fork.c:1887
        _do_fork+0x1cb/0x11d0 kernel/fork.c:2216
        kernel_thread+0x34/0x40 kernel/fork.c:2275
        rest_init+0x28/0x372 init/main.c:409
        arch_call_rest_init+0xe/0x1b
        start_kernel+0x9f0/0xa2b init/main.c:745
        x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:472
        x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:451
        secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

-> #1 (&p->pi_lock){-.-.}:
        __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
        _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152
        try_to_wake_up+0xdc/0x1490 kernel/sched/core.c:1965
        wake_up_process+0x10/0x20 kernel/sched/core.c:2129
        __up.isra.1+0x1c0/0x2a0 kernel/locking/semaphore.c:262
        up+0x13c/0x1c0 kernel/locking/semaphore.c:187
        __up_console_sem+0xbe/0x1b0 kernel/printk/printk.c:236
        console_unlock+0x811/0x1190 kernel/printk/printk.c:2432
        vprintk_emit+0x391/0x990 kernel/printk/printk.c:1922
        vprintk_default+0x28/0x30 kernel/printk/printk.c:1964
        vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398
        printk+0xa7/0xcf kernel/printk/printk.c:1997
        check_stack_usage kernel/exit.c:755 [inline]
        do_exit.cold.18+0x57/0x16f kernel/exit.c:916
        do_group_exit+0x177/0x440 kernel/exit.c:970
        __do_sys_exit_group kernel/exit.c:981 [inline]
        __se_sys_exit_group kernel/exit.c:979 [inline]
        __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:979
        do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
        entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #0 ((console_sem).lock){-.-.}:
        lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844
        __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
        _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152
        down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
        __down_trylock_console_sem+0xae/0x1f0 kernel/printk/printk.c:219
        console_trylock+0x15/0xa0 kernel/printk/printk.c:2247
        console_trylock_spinning kernel/printk/printk.c:1653 [inline]
        vprintk_emit+0x372/0x990 kernel/printk/printk.c:1921
        vprintk_default+0x28/0x30 kernel/printk/printk.c:1964
        vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398
        printk+0xa7/0xcf kernel/printk/printk.c:1997
        __warn+0x9e/0x1d0 kernel/panic.c:522
        report_bug+0x254/0x2d0 lib/bug.c:186
        fixup_bug arch/x86/kernel/traps.c:178 [inline]
        do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
        do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
        invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
        rq_clock_task kernel/sched/sched.h:1015 [inline]
        cfs_rq_clock_task kernel/sched/fair.c:4283 [inline]
        update_load_avg+0x1539/0x2470 kernel/sched/fair.c:3492
        update_blocked_averages+0xcc7/0x1e00 kernel/sched/fair.c:7401
        run_rebalance_domains+0x37c/0x500 kernel/sched/fair.c:9696
        __do_softirq+0x308/0xb7e kernel/softirq.c:292
        invoke_softirq kernel/softirq.c:373 [inline]
        irq_exit+0x17f/0x1c0 kernel/softirq.c:413
        exiting_irq arch/x86/include/asm/apic.h:536 [inline]
        smp_apic_timer_interrupt+0x1cb/0x760 arch/x86/kernel/apic/apic.c:1061
        apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804
        native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:57
        arch_safe_halt arch/x86/include/asm/paravirt.h:151 [inline]
        default_idle+0xbf/0x490 arch/x86/kernel/process.c:498
        arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:489
        default_idle_call+0x6d/0x90 kernel/sched/idle.c:93
        cpuidle_idle_call kernel/sched/idle.c:153 [inline]
        do_idle+0x49b/0x5c0 kernel/sched/idle.c:262
        cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:353
        start_secondary+0x487/0x5f0 arch/x86/kernel/smpboot.c:271
        secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

other info that might help us debug this:

Chain exists of:
   (console_sem).lock --> &p->pi_lock --> &rq->lock

  Possible unsafe locking scenario:

        CPU0                    CPU1
        ----                    ----
   lock(&rq->lock);
                                lock(&p->pi_lock);
                                lock(&rq->lock);
   lock((console_sem).lock);

  *** DEADLOCK ***

1 lock held by swapper/1/0:
  #0: 000000008d358a10 (&rq->lock){-.-.}, at: rq_lock_irqsave  
kernel/sched/sched.h:1110 [inline]
  #0: 000000008d358a10 (&rq->lock){-.-.}, at:  
update_blocked_averages+0x156/0x1e00 kernel/sched/fair.c:7381

stack backtrace:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.20.0-rc2+ #302
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  <IRQ>
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x244/0x39d lib/dump_stack.c:113
  print_circular_bug.isra.35.cold.54+0x1bd/0x27d  
kernel/locking/lockdep.c:1221
  check_prev_add kernel/locking/lockdep.c:1863 [inline]
  check_prevs_add kernel/locking/lockdep.c:1976 [inline]
  validate_chain kernel/locking/lockdep.c:2347 [inline]
  __lock_acquire+0x3399/0x4c20 kernel/locking/lockdep.c:3341
  lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844
  __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
  _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152
  down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
  __down_trylock_console_sem+0xae/0x1f0 kernel/printk/printk.c:219
  console_trylock+0x15/0xa0 kernel/printk/printk.c:2247
  console_trylock_spinning kernel/printk/printk.c:1653 [inline]
  vprintk_emit+0x372/0x990 kernel/printk/printk.c:1921
  vprintk_default+0x28/0x30 kernel/printk/printk.c:1964
  vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398
  printk+0xa7/0xcf kernel/printk/printk.c:1997
  __warn+0x9e/0x1d0 kernel/panic.c:522
  report_bug+0x254/0x2d0 lib/bug.c:186
  fixup_bug arch/x86/kernel/traps.c:178 [inline]
  do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
  do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
  invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
RIP: 0010:rq_clock_task kernel/sched/sched.h:1015 [inline]
RIP: 0010:cfs_rq_clock_task kernel/sched/fair.c:4283 [inline]
RIP: 0010:update_load_avg+0x1539/0x2470 kernel/sched/fair.c:3492
Code: e8 fc e1 69 00 e9 8b f8 ff ff 48 8d 7a 18 be ff ff ff ff 48 89 95 30  
fb ff ff e8 52 e5 07 00 48 8b 95 30 fb ff ff 85 c0 75 29 <0f> 0b 48 b8 00  
00 00 00 00 fc ff df 4c 89 f9 48 c1 e9 03 80 3c 01
RSP: 0018:ffff8881daf07238 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8881b3b487c0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000086
RBP: ffff8881daf07750 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8881daf2d850 R12: ffff8881bf344bc0
R13: ffff8881daf07728 R14: 0000000000000000 R15: ffff8881b3b48930
  update_blocked_averages+0xcc7/0x1e00 kernel/sched/fair.c:7401
  run_rebalance_domains+0x37c/0x500 kernel/sched/fair.c:9696
  __do_softirq+0x308/0xb7e kernel/softirq.c:292
  invoke_softirq kernel/softirq.c:373 [inline]
  irq_exit+0x17f/0x1c0 kernel/softirq.c:413
  exiting_irq arch/x86/include/asm/apic.h:536 [inline]
  smp_apic_timer_interrupt+0x1cb/0x760 arch/x86/kernel/apic/apic.c:1061
  ? inte
Lost 38 message(s)!
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:

The buggy address belongs to the page:
page:ffffea00076b8000 count:1 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000001000(reserved)
raw: 02fffc0000001000 ffffea00076b8008 ffffea00076b8008 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8881dadfff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  ffff8881dae00000: 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1
> ffff8881dae00080: f1 00 f2 f2 f2 f2 f2 f2 f2 f8 f2 f2 f2 00 00 00
                                                        ^
  ffff8881dae00100: 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1
  ffff8881dae00180: f1 f8 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00
==================================================================
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 6371 Comm: syz-executor496 Tainted: G    B              
4.20.0-rc2+ #302
Shutting down cpus with NMI


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with  
syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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