loop6: rw=12288, want=8200, limit=20
attempt to access beyond end of device
loop6: rw=12288, want=12296, limit=20
------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: percpu_counter hint:           (null)
WARNING: CPU: 1 PID: 11652 at lib/debugobjects.c:329 debug_print_object+0x16a/0x210 lib/debugobjects.c:326
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 11652 Comm: syz-executor6 Not tainted 4.19.0-rc2+ #5
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+0x1c9/0x2b4 lib/dump_stack.c:113
 panic+0x238/0x4e7 kernel/panic.c:184
 __warn.cold.8+0x163/0x1ba kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:993
RIP: 0010:debug_print_object+0x16a/0x210 lib/debugobjects.c:326
Code: 5d 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 92 00 00 00 48 8b 14 dd c0 79 5d 87 4c 89 f6 48 c7 c7 60 6f 5d 87 e8 06 7d d2 fd <0f> 0b 83 05 a9 6d 3b 05 01 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffff88018f2cf2b0 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffc900050f4000
RDX: 00000000000363c6 RSI: ffffffff8163bab1 RDI: 0000000000000001
RBP: ffff88018f2cf2f0 R08: ffff88018f958340 R09: ffffed003b623eca
R10: ffffed003b623eca R11: ffff8801db11f657 R12: 0000000000000001
R13: ffffffff884e00c0 R14: ffffffff875d7400 R15: 0000000000000000
 __debug_check_no_obj_freed lib/debugobjects.c:786 [inline]
 debug_check_no_obj_freed+0x3b2/0x595 lib/debugobjects.c:818
 kfree+0xc7/0x210 mm/slab.c:3812
 f2fs_fill_super+0xe1a/0x8150 fs/f2fs/super.c:3145
 mount_bdev+0x30c/0x3e0 fs/super.c:1158
 f2fs_mount+0x34/0x40 fs/f2fs/super.c:3159
 mount_fs+0xae/0x328 fs/super.c:1261
 vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2457 [inline]
 do_mount+0x581/0x30e0 fs/namespace.c:2787
 ksys_mount+0x12d/0x140 fs/namespace.c:3003
 __do_sys_mount fs/namespace.c:3017 [inline]
 __se_sys_mount fs/namespace.c:3014 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3014
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459aca
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 bd 8a fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 9a 8a fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f5667372a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5667372b30 RCX: 0000000000459aca
RDX: 00007f5667372ad0 RSI: 0000000020000100 RDI: 00007f5667372af0
RBP: 0000000020000100 R08: 00007f5667372b30 R09: 00007f5667372ad0
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003
R13: 0000000000000000 R14: 00000000004ca28d R15: 0000000000000000

======================================================
WARNING: possible circular locking dependency detected
4.19.0-rc2+ #5 Not tainted
------------------------------------------------------
syz-executor6/11652 is trying to acquire lock:
00000000c9d31041 ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136

but task is already holding lock:
00000000b35e2647 (&obj_hash[i].lock){-.-.}, at: __debug_check_no_obj_freed lib/debugobjects.c:777 [inline]
00000000b35e2647 (&obj_hash[i].lock){-.-.}, at: debug_check_no_obj_freed+0x16c/0x595 lib/debugobjects.c:818

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+0x96/0xc0 kernel/locking/spinlock.c:152
       __debug_object_init+0x127/0x12e0 lib/debugobjects.c:384
       debug_object_init+0x16/0x20 lib/debugobjects.c:432
       debug_hrtimer_init kernel/time/hrtimer.c:410 [inline]
       debug_init kernel/time/hrtimer.c:458 [inline]
       hrtimer_init+0x97/0x410 kernel/time/hrtimer.c:1308
       init_dl_task_timer+0x1b/0x50 kernel/sched/deadline.c:1057
       __sched_fork+0x2ae/0x590 kernel/sched/core.c:2160
       init_idle+0x75/0x740 kernel/sched/core.c:5377
       sched_init+0xbee/0xcbd kernel/sched/core.c:6060
       start_kernel+0x47d/0x94e init/main.c:602
       x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452
       x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433
       secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242

-> #2 (&rq->lock){-.-.}:
       __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
       _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144
       rq_lock kernel/sched/sched.h:1821 [inline]
       task_fork_fair+0x93/0x680 kernel/sched/fair.c:9574
       sched_fork+0x44b/0xbd0 kernel/sched/core.c:2353
       copy_process+0x235e/0x7af0 kernel/fork.c:1839
       _do_fork+0x1ca/0x1170 kernel/fork.c:2166
       kernel_thread+0x34/0x40 kernel/fork.c:2225
       rest_init+0x22/0xe4 init/main.c:408
       start_kernel+0x913/0x94e init/main.c:739
       x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452
       x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433
       secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242

-> #1 (&p->pi_lock){-.-.}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
       try_to_wake_up+0xd2/0x1250 kernel/sched/core.c:1960
       wake_up_process+0x10/0x20 kernel/sched/core.c:2123
       __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:244
       console_unlock+0x506/0x10e0 kernel/printk/printk.c:2429
       vprintk_emit+0x33a/0x910 kernel/printk/printk.c:1926
       vprintk_default+0x28/0x30 kernel/printk/printk.c:1967
       vprintk_func+0x7a/0x117 kernel/printk/printk_safe.c:398
       printk+0xa7/0xcf kernel/printk/printk.c:2000
       load_umh+0x51/0xbd net/bpfilter/bpfilter_kern.c:98
       do_one_initcall+0x127/0x838 init/main.c:885
       do_initcall_level init/main.c:953 [inline]
       do_initcalls init/main.c:961 [inline]
       do_basic_setup init/main.c:979 [inline]
       kernel_init_freeable+0x4bb/0x5ae init/main.c:1144
       kernel_init+0x11/0x1b3 init/main.c:1063
       ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413

-> #0 ((console_sem).lock){-.-.}:
       lock_acquire+0x1e4/0x4f0 kernel/locking/lockdep.c:3901
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
       down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
       __down_trylock_console_sem+0xae/0x200 kernel/printk/printk.c:227
       console_trylock+0x15/0xa0 kernel/printk/printk.c:2248
       console_trylock_spinning kernel/printk/printk.c:1650 [inline]
       vprintk_emit+0x31f/0x910 kernel/printk/printk.c:1925
       vprintk_default+0x28/0x30 kernel/printk/printk.c:1967
       vprintk_func+0x7a/0x117 kernel/printk/printk_safe.c:398
       printk+0xa7/0xcf kernel/printk/printk.c:2000
       __warn_printk+0x8c/0xe0 kernel/panic.c:590
       debug_print_object+0x16a/0x210 lib/debugobjects.c:326
       __debug_check_no_obj_freed lib/debugobjects.c:786 [inline]
       debug_check_no_obj_freed+0x3b2/0x595 lib/debugobjects.c:818
       kfree+0xc7/0x210 mm/slab.c:3812
       f2fs_fill_super+0xe1a/0x8150 fs/f2fs/super.c:3145
       mount_bdev+0x30c/0x3e0 fs/super.c:1158
       f2fs_mount+0x34/0x40 fs/f2fs/super.c:3159
       mount_fs+0xae/0x328 fs/super.c:1261
       vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961
       vfs_kern_mount fs/namespace.c:951 [inline]
       do_new_mount fs/namespace.c:2457 [inline]
       do_mount+0x581/0x30e0 fs/namespace.c:2787
       ksys_mount+0x12d/0x140 fs/namespace.c:3003
       __do_sys_mount fs/namespace.c:3017 [inline]
       __se_sys_mount fs/namespace.c:3014 [inline]
       __x64_sys_mount+0xbe/0x150 fs/namespace.c:3014
       do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

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 ***

2 locks held by syz-executor6/11652:
 #0: 00000000a2d6a1af (&type->s_umount_key#72/1){+.+.}, at: alloc_super fs/super.c:226 [inline]
 #0: 00000000a2d6a1af (&type->s_umount_key#72/1){+.+.}, at: sget_userns+0x2e3/0xf40 fs/super.c:519
 #1: 00000000b35e2647 (&obj_hash[i].lock){-.-.}, at: __debug_check_no_obj_freed lib/debugobjects.c:777 [inline]
 #1: 00000000b35e2647 (&obj_hash[i].lock){-.-.}, at: debug_check_no_obj_freed+0x16c/0x595 lib/debugobjects.c:818

stack backtrace:
CPU: 1 PID: 11652 Comm: syz-executor6 Not tainted 4.19.0-rc2+ #5
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+0x1c9/0x2b4 lib/dump_stack.c:113
 print_circular_bug.isra.34.cold.55+0x1bd/0x27d kernel/locking/lockdep.c:1222
 check_prev_add kernel/locking/lockdep.c:1862 [inline]
 check_prevs_add kernel/locking/lockdep.c:1975 [inline]
 validate_chain kernel/locking/lockdep.c:2416 [inline]
 __lock_acquire+0x3449/0x5020 kernel/locking/lockdep.c:3412
 lock_acquire+0x1e4/0x4f0 kernel/locking/lockdep.c:3901
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
 __down_trylock_console_sem+0xae/0x200 kernel/printk/printk.c:227
 console_trylock+0x15/0xa0 kernel/printk/printk.c:2248
 console_trylock_spinning kernel/printk/printk.c:1650 [inline]
 vprintk_emit+0x31f/0x910 kernel/printk/printk.c:1925
 vprintk_default+0x28/0x30 kernel/printk/printk.c:1967
 vprintk_func+0x7a/0x117 kernel/printk/printk_safe.c:398
 printk+0xa7/0xcf kernel/printk/printk.c:2000
 __warn_printk+0x8c/0xe0 kernel/panic.c:590
 debug_print_object+0x16a/0x210 lib/debugobjects.c:326
 __debug_check_no_obj_freed lib/debugobjects.c:786 [inline]
 debug_check_no_obj_freed+0x3b2/0x595 lib/debugobjects.c:818
 kfree+0xc7/0x210 mm/slab.c:3812
 f2fs_fill_super+0xe1a/0x8150 fs/f2fs/super.c:3145
 mount_bdev+0x30c/0x3e0 fs/super.c:1158
 f2fs_mount+0x34/0x40 fs/f2fs/super.c:3159
 mount_fs+0xae/0x328 fs/super.c:1261
 vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2457 [inline]
 do_mount+0x581/0x30e0 fs/namespace.c:2787
 ksys_mount+0x12d/0x140 fs/namespace.c:3003
 __do_sys_mount fs/namespace.c:3017 [inline]
 __se_sys_mount fs/namespace.c:3014 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3014
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459aca
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 bd 8a fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 9a 8a fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f5667372a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5667372b30 RCX: 0000000000459aca
RDX: 00007f5667372ad0 RSI: 0000000020000100 RDI: 00007f5667372af0
RBP: 0000000020000100 R08: 00007f5667372b30 R09: 00007f5667372ad0
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003
R13: 0000000000000000 R14: 00000000004ca28d R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..