==================================================================
kasan: CONFIG_KASAN_INLINE enabled
BUG: KASAN: stack-out-of-bounds in __d_lookup+0x8bb/0x9e0 fs/dcache.c:2269
kasan: GPF could be caused by NULL-ptr deref or user memory access
Read of size 4 at addr ffff8881dae000e0 by task syz-executor4/6161
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 7992 Comm: syz-executor3 Not tainted 4.20.0-rc6+ #345
CPU: 1 PID: 6161 Comm: syz-executor4 Not tainted 4.20.0-rc6+ #345
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+0x191/0x450 lib/debugobjects.c:542
Call Trace:
------------[ cut here ]------------
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x244/0x39d lib/dump_stack.c:113
Bad or missing usercopy whitelist? Kernel memory overwrite attempt detected to SLAB object '@' (offset 18446744069951467168, size 64)!
WARNING: CPU: 0 PID: 7992 at mm/usercopy.c:83 usercopy_warn+0xee/0x110 mm/usercopy.c:78
Kernel panic - not syncing: panic_on_warn set ...
print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412
__asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432
__d_lookup+0x8bb/0x9e0 fs/dcache.c:2269
d_lookup+0x1e0/0x300 fs/dcache.c:2214
mountpoint_last fs/namei.c:2657 [inline]
path_mountpoint+0x1f1/0x2180 fs/namei.c:2695
filename_mountpoint+0x245/0x460 fs/namei.c:2717
user_path_mountpoint_at+0x37/0x40 fs/namei.c:2747
ksys_umount+0x1c5/0x12d0 fs/namespace.c:1645
__do_sys_umount fs/namespace.c:1671 [inline]
__se_sys_umount fs/namespace.c:1669 [inline]
__x64_sys_umount+0x54/0x80 fs/namespace.c:1669
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a0a7
Code: 44 00 00 b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 9d 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 7d 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd17b777b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00000000000241cd RCX: 000000000045a0a7
RDX: 000000000000000c RSI: 0000000000000002 RDI: 00007ffd17b788f0
RBP: 0000000000000127 R08: 0000000000000001 R09: 0000000002450940
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd17b788f0
R13: 0000000000024139 R14: 0000000000000000 R15: 0000000000000004
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
==================================================================
Kernel Offset: disabled
======================================================
WARNING: possible circular locking dependency detected
4.20.0-rc6+ #345 Not tainted
------------------------------------------------------
syz-executor3/7992 is trying to acquire lock:
00000000a09a80d5 ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
but task is already holding lock:
00000000f936b59e (&obj_hash[i].lock){-.-.}, at: debug_object_deactivate+0xf7/0x450 lib/debugobjects.c:540
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+0x99/0xd0 kernel/locking/spinlock.c:152
__debug_object_init+0x127/0x1290 lib/debugobjects.c:383
debug_object_init+0x16/0x20 lib/debugobjects.c:431
debug_hrtimer_init kernel/time/hrtimer.c:410 [inline]
debug_init kernel/time/hrtimer.c:458 [inline]
hrtimer_init+0x97/0x490 kernel/time/hrtimer.c:1308
init_dl_task_timer+0x1b/0x50 kernel/sched/deadline.c:1057
__sched_fork+0x2ae/0x590 kernel/sched/core.c:2166
init_idle+0x75/0x740 kernel/sched/core.c:5374
sched_init+0xb33/0xc07 kernel/sched/core.c:6063
start_kernel+0x4c1/0xa30 init/main.c:608
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
x86_64_start_kernel+0x76/0x79 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+0x2d/0x40 kernel/locking/spinlock.c:144
rq_lock kernel/sched/sched.h:1124 [inline]
task_fork_fair+0xb0/0x6d0 kernel/sched/fair.c:9802
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+0x9f5/0xa30 init/main.c:745
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
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/0x1440 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){-.-.}:
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 ***
5 locks held by syz-executor3/7992:
#0: 000000001bfd9888 (rcu_read_lock){....}, at: __skb_unlink include/linux/skbuff.h:1922 [inline]
#0: 000000001bfd9888 (rcu_read_lock){....}, at: __skb_dequeue include/linux/skbuff.h:1938 [inline]
#0: 000000001bfd9888 (rcu_read_lock){....}, at: process_backlog+0x1dd/0x7a0 net/core/dev.c:5910
#1: 000000001bfd9888 (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2155 [inline]
#1: 000000001bfd9888 (rcu_read_lock){....}, at: ip_local_deliver_finish+0x13d/0x390 net/ipv4/ip_input.c:231
#2: 00000000f4ec76ed (hrtimer_bases.lock){-.-.}, at: hrtimer_interrupt+0xfc/0x780 kernel/time/hrtimer.c:1499
#3: 00000000f936b59e (&obj_hash[i].lock){-.-.}, at: debug_object_deactivate+0xf7/0x450 lib/debugobjects.c:540
#4: 000000001bfd9888 (rcu_read_lock){....}, at: atomic_notifier_call_chain+0x0/0x190 kernel/notifier.c:329
stack backtrace:
CPU: 0 PID: 7992 Comm: syz-executor3 Not tainted 4.20.0-rc6+ #345
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
Rebooting in 86400 seconds..