IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
kasan: CONFIG_KASAN_INLINE enabled
==================================================================
BUG: KASAN: stack-out-of-bounds in lookup_object lib/debugobjects.c:156 [inline]
BUG: KASAN: stack-out-of-bounds in debug_object_deactivate lib/debugobjects.c:542 [inline]
BUG: KASAN: stack-out-of-bounds in debug_object_deactivate+0x385/0x4b0 lib/debugobjects.c:529
kasan: GPF could be caused by NULL-ptr deref or user memory access
Read of size 8 at addr ffff8880a854cab8 by task swapper/0/0
general protection fault: 0000 [#1] PREEMPT SMP KASAN

CPU: 1 PID: 7907 Comm: syz-executor466 Not tainted 4.20.0+ #3
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.20.0+ #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:lookup_object lib/debugobjects.c:156 [inline]
RIP: 0010:debug_object_deactivate lib/debugobjects.c:542 [inline]
RIP: 0010:debug_object_deactivate+0x16c/0x4b0 lib/debugobjects.c:529
Call Trace:
Code: c1 ea 03 42 80 3c 2a 00 0f 85 49 02 00 00 4d 8b 24 24 4d 85 e4 0f 84 d1 00 00 00 49 8d 7c 24 18 83 c3 01 48 89 fa 48 c1 ea 03 <42> 80 3c 2a 00 0f 85 fa 01 00 00 49 3b 4c 24 18 75 c0 49 8d 7c 24
 <IRQ>
RSP: 0018:ffff8880ae707b80 EFLAGS: 00010006
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
RAX: 1ffffffff16d4c90 RBX: 0000000000000009 RCX: ffff8880ae726620
RDX: 0000000000000003 RSI: 0000000000000004 RDI: 0000000000000019
RBP: ffff8880ae707c70 R08: 1ffff11015ce0f5c R09: ffffffff899ae220
R10: 0000000000000082 R11: 0000000000000003 R12: 0000000000000001
R13: dffffc0000000000 R14: 1ffff11015ce0f74 R15: ffffffff8b6a6488
FS:  0000000001eec880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200000c0 CR3: 00000000a1bf5000 CR4: 00000000001406e0
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report mm/kasan/report.c:412 [inline]
 kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
 lookup_object lib/debugobjects.c:156 [inline]
 debug_object_deactivate lib/debugobjects.c:542 [inline]
 debug_object_deactivate+0x385/0x4b0 lib/debugobjects.c:529
Call Trace:
 <IRQ>
 debug_hrtimer_deactivate kernel/time/hrtimer.c:412 [inline]
 debug_deactivate kernel/time/hrtimer.c:462 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1359 [inline]
 __hrtimer_run_queues+0x225/0x1050 kernel/time/hrtimer.c:1451
 debug_hrtimer_deactivate kernel/time/hrtimer.c:412 [inline]
 debug_deactivate kernel/time/hrtimer.c:462 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1359 [inline]
 __hrtimer_run_queues+0x225/0x1050 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
 smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
 smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:native_safe_halt+0x2/0x10 arch/x86/include/asm/irqflags.h:58
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
Code: ff ff ff 48 89 c7 48 89 45 d8 e8 c9 1a ce f9 48 8b 45 d8 e9 ce fe ff ff 48 89 df e8 b8 1a ce f9 eb 82 90 90 90 90 90 90 fb f4 <c3> 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 f4 c3 90 90 90 90 90 90
 </IRQ>
RSP: 0018:ffffffff89807c60 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
Modules linked in:
RAX: 1ffffffff1324a09 RBX: 1ffffffff1300f8f RCX: 0000000000000000

======================================================
WARNING: possible circular locking dependency detected
4.20.0+ #3 Not tainted
------------------------------------------------------
syz-executor466/7907 is trying to acquire lock:
000000004bb77632 ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136

but task is already holding lock:
00000000bf17e612 (&obj_hash[i].lock){-.-.}, at: debug_object_deactivate lib/debugobjects.c:540 [inline]
00000000bf17e612 (&obj_hash[i].lock){-.-.}, at: debug_object_deactivate+0x101/0x4b0 lib/debugobjects.c:529

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&obj_hash[i].lock){-.-.}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
       __debug_object_init+0xf6/0x12d0 lib/debugobjects.c:383
       debug_object_init+0x16/0x20 lib/debugobjects.c:431
       debug_hrtimer_init kernel/time/hrtimer.c:401 [inline]
       debug_init kernel/time/hrtimer.c:449 [inline]
       hrtimer_init+0x97/0x480 kernel/time/hrtimer.c:1299
       init_dl_task_timer+0x1b/0x50 kernel/sched/deadline.c:1057
       __sched_fork+0x2bf/0x5b0 kernel/sched/core.c:2166
       init_idle+0x75/0x670 kernel/sched/core.c:5374
       sched_init+0xb10/0xbe8 kernel/sched/core.c:6063
       start_kernel+0x440/0x8bd init/main.c:608
       x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
       x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:451
       secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

-> #2 (&rq->lock){-.-.}:
       __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
       _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
       rq_lock kernel/sched/sched.h:1149 [inline]
       task_fork_fair+0xb5/0x7a0 kernel/sched/fair.c:10083
       sched_fork+0x437/0xb90 kernel/sched/core.c:2359
       copy_process+0x1ff6/0x8730 kernel/fork.c:1892
       _do_fork+0x1a9/0x1170 kernel/fork.c:2221
       kernel_thread+0x34/0x40 kernel/fork.c:2280
       rest_init+0x28/0x37b init/main.c:409
       arch_call_rest_init+0xe/0x1b
       start_kernel+0x882/0x8bd init/main.c:741
       x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
       x86_64_start_kernel+0x77/0x7b 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+0x95/0xcd kernel/locking/spinlock.c:152
       try_to_wake_up+0xb9/0x1480 kernel/sched/core.c:1965
       wake_up_process+0x10/0x20 kernel/sched/core.c:2129
       __up.isra.0+0x1c0/0x2a0 kernel/locking/semaphore.c:262
       up+0x13e/0x1c0 kernel/locking/semaphore.c:187
       __up_console_sem+0xb7/0x1c0 kernel/printk/printk.c:236
       console_unlock+0x778/0x11e0 kernel/printk/printk.c:2426
       vprintk_emit+0x370/0x960 kernel/printk/printk.c:1931
       vprintk_default+0x28/0x30 kernel/printk/printk.c:1958
       vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
       printk+0xba/0xed kernel/printk/printk.c:1991
       check_stack_usage kernel/exit.c:755 [inline]
       do_exit.cold+0x155/0x16a kernel/exit.c:916
       do_group_exit+0x177/0x430 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+0x44/0x50 kernel/exit.c:979
       do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #0 ((console_sem).lock){-.-.}:
       lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
       down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
       __down_trylock_console_sem+0xa8/0x210 kernel/printk/printk.c:219
       console_trylock+0x15/0xa0 kernel/printk/printk.c:2242
       console_trylock_spinning kernel/printk/printk.c:1662 [inline]
       vprintk_emit+0x351/0x960 kernel/printk/printk.c:1930
       vprintk_default+0x28/0x30 kernel/printk/printk.c:1958
       vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
       printk+0xba/0xed kernel/printk/printk.c:1991
       kasan_die_handler arch/x86/mm/kasan_init_64.c:250 [inline]
       kasan_die_handler.cold+0x11/0x23 arch/x86/mm/kasan_init_64.c:245
       notifier_call_chain+0x179/0x380 kernel/notifier.c:93
       __atomic_notifier_call_chain kernel/notifier.c:183 [inline]
       atomic_notifier_call_chain+0x96/0x190 kernel/notifier.c:193
       notify_die+0x1b2/0x270 kernel/notifier.c:549
       do_general_protection+0x13d/0x300 arch/x86/kernel/traps.c:557
       general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1142
       lookup_object lib/debugobjects.c:156 [inline]
       debug_object_deactivate lib/debugobjects.c:542 [inline]
       debug_object_deactivate+0x16c/0x4b0 lib/debugobjects.c:529
       debug_hrtimer_deactivate kernel/time/hrtimer.c:412 [inline]
       debug_deactivate kernel/time/hrtimer.c:462 [inline]
       __run_hrtimer kernel/time/hrtimer.c:1359 [inline]
       __hrtimer_run_queues+0x225/0x1050 kernel/time/hrtimer.c:1451
       hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
       local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
       smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
       apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807

other info that might help us debug this:

Chain exists of:
  (console_sem).lock --> &rq->lock --> &obj_hash[i].lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&obj_hash[i].lock);
                               lock(&rq->lock);
                               lock(&obj_hash[i].lock);
  lock((console_sem).lock);

 *** DEADLOCK ***

6 locks held by syz-executor466/7907:
 #0: 000000000ef89f7e (&tfile->napi_mutex){+.+.}, at: tun_get_user+0x125f/0x4150 drivers/net/tun.c:1842
 #1: 000000002e28d845 (rcu_read_lock){....}, at: arch_static_branch arch/x86/include/asm/jump_label.h:36 [inline]
 #1: 000000002e28d845 (rcu_read_lock){....}, at: netif_receive_skb_internal+0x9c/0x690 net/core/dev.c:5160
 #2: 000000002e28d845 (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2158 [inline]
 #2: 000000002e28d845 (rcu_read_lock){....}, at: ip_local_deliver_finish+0x13a/0x390 net/ipv4/ip_input.c:231
 #3: 000000006ea68e3b (hrtimer_bases.lock){-.-.}, at: hrtimer_interrupt+0xff/0x770 kernel/time/hrtimer.c:1490
 #4: 00000000bf17e612 (&obj_hash[i].lock){-.-.}, at: debug_object_deactivate lib/debugobjects.c:540 [inline]
 #4: 00000000bf17e612 (&obj_hash[i].lock){-.-.}, at: debug_object_deactivate+0x101/0x4b0 lib/debugobjects.c:529
 #5: 000000002e28d845 (rcu_read_lock){....}, at: atomic_notifier_call_chain+0x0/0x190 kernel/notifier.c:329

stack backtrace:
CPU: 1 PID: 7907 Comm: syz-executor466 Not tainted 4.20.0+ #3
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+0x1db/0x2d0 lib/dump_stack.c:113
 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1224
 check_prev_add kernel/locking/lockdep.c:1866 [inline]
 check_prevs_add kernel/locking/lockdep.c:1979 [inline]
 validate_chain kernel/locking/lockdep.c:2350 [inline]
 __lock_acquire+0x3014/0x4a30 kernel/locking/lockdep.c:3338
 lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
 __down_trylock_console_sem+0xa8/0x210 kernel/printk/printk.c:219
 console_trylock+0x15/0xa0 kernel/printk/printk.c:2242
 console_trylock_spinning kernel/printk/printk.c:1662 [inline]
 vprintk_emit+0x351/0x960 kernel/printk/printk.c:1930
 vprintk_default+0x28/0x30 kernel/printk/printk.c:1958
 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
 printk+0xba/0xed kernel/printk/printk.c:1991
 kasan_die_handler arch/x86/mm/kasan_init_64.c:250 [inline]
 kasan_die_handler.cold+0x11/0x23 arch/x86/mm/kasan_init_64.c:245
 notifier_call_chain+0x179/0x380 kernel/notifier.c:93
 __atomic_notifier_call_chain kernel/notifier.c:183 [inline]
 atomic_notifier_call_chain+0x96/0x190 kernel/notifier.c:193
 notify_die+0x1b2/0x270 kernel/notifier.c:549
 do_general_protection+0x13d/0x300 arch/x86/kernel/traps.c:557
 general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1142
RIP: 0010:lookup_object lib/debugobjects.c:156 [inline]
RIP: 0010:debug_object_deactivate lib/debugobjects.c:542 [inline]
RIP: 0010:debug_object_deactivate+0x16c/0x4b0 lib/debugobjects.c:529
Code: c1 ea 03 42 80 3c 2a 00 0f 85 49 02 00 00 4d 8b 24 24 4d 85 e4 0f 84 d1 00 00 00 49 8d 7c 24 18 83 c3 01 48 89 fa 48 c1 ea 03 <42> 80 3c 2a 00 0f 85 fa 01 00 00 49 3b 4c 24 18 75 c0 49 8d 7c 24
RSP: 0018:ffff8880ae707b80 EFLAGS: 00010006
RAX: 1ffffffff16d4c90 RBX: 0000000000000009 RCX: ffff8880ae726620
RDX: 0000000000000003 RSI: 0000000000000004 RDI: 0000000000000019
RBP: ffff8880ae707c70 R08: 1ffff11015ce0f5c R09: ffffffff899ae220
R10: 0000000000000082 R11: 0000000000000003 R12: 0000000000000001
R13: dffffc0000000000 R14: 1ffff11015ce0f74 R15: ffffffff8b6a6488
 debug_hrtimer_deactivate kernel/time/hrtimer.c:412 [inline]
 debug_deactivate kernel/time/hrtimer.c:462 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1359 [inline]
 __hrtimer_run_queues+0x225/0x1050 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
 smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
---[ end trace 9991f0df0986b6d9 ]---
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff8987b73c
RIP: 0010:lookup_object lib/debugobjects.c:156 [inline]
RIP: 0010:debug_object_deactivate lib/debugobjects.c:542 [inline]
RIP: 0010:debug_object_deactivate+0x16c/0x4b0 lib/debugobjects.c:529
RBP: ffffffff89807d20 R08: ffffffff8987aec0 R09: 0000000000000000
Code: c1 ea 03 42 80 3c 2a 00 0f 85 49 02 00 00 4d 8b 24 24 4d 85 e4 0f 84 d1 00 00 00 49 8d 7c 24 18 83 c3 01 48 89 fa 48 c1 ea 03 <42> 80 3c 2a 00 0f 85 fa 01 00 00 49 3b 4c 24 18 75 c0 49 8d 7c 24
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
RSP: 0018:ffff8880ae707b80 EFLAGS: 00010006
R13: ffffffff89807cf8 R14: 0000000000000000 R15: ffffffff89925038
RAX: 1ffffffff16d4c90 RBX: 0000000000000009 RCX: ffff8880ae726620
RDX: 0000000000000003 RSI: 0000000000000004 RDI: 0000000000000019
RBP: ffff8880ae707c70 R08: 1ffff11015ce0f5c R09: ffffffff899ae220
R10: 0000000000000082 R11: 0000000000000003 R12: 0000000000000001
R13: dffffc0000000000 R14: 1ffff11015ce0f74 R15: ffffffff8b6a6488
FS:  0000000001eec880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200000c0 CR3: 00000000a1bf5000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:555
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
 default_idle_call+0x36/0x90 kernel/sched/idle.c:93