overlayfs: filesystem on './bus' not supported as upperdir
INFO: task syz-executor.2:21644 blocked for more than 140 seconds.
Not tainted 4.14.224-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D27784 21644 8015 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x88b/0x1de0 kernel/sched/core.c:3384
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline]
rwsem_down_write_failed+0x343/0x6d0 kernel/locking/rwsem-xadd.c:617
call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x4f/0x90 kernel/locking/rwsem.c:56
grab_super+0x55/0x140 fs/super.c:373
sget_userns+0x2b1/0xc10 fs/super.c:504
sget+0xd1/0x110 fs/super.c:572
mount_bdev+0xcd/0x360 fs/super.c:1107
mount_fs+0x92/0x2a0 fs/super.c:1237
vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
vfs_kern_mount fs/namespace.c:1036 [inline]
do_new_mount fs/namespace.c:2549 [inline]
do_mount+0xe53/0x2a00 fs/namespace.c:2879
SYSC_mount fs/namespace.c:3095 [inline]
SyS_mount+0xa8/0x120 fs/namespace.c:3072
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x465f69
RSP: 002b:00007f20f482b188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69
RDX: 0000000020000200 RSI: 0000000020000180 RDI: 0000000020000000
RBP: 00000000004bfa3f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007fff502062bf R14: 00007f20f482b300 R15: 0000000000022000
Showing all locks held in the system:
1 lock held by khungtaskd/1532:
#0: (tasklist_lock){.+.+}, at: [<ffffffff86ff2967>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548
2 locks held by syz-executor.2/21644:
#0: (&bdev->bd_fsfreeze_mutex){+.+.}, at: [<ffffffff81871de1>] mount_bdev+0x71/0x360 fs/super.c:1101
#1: (&type->s_umount_key#78){+.+.}, at: [<ffffffff81870e75>] grab_super+0x55/0x140 fs/super.c:373
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1532 Comm: khungtaskd Not tainted 4.14.224-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x281 lib/dump_stack.c:58
nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
watchdog+0x5b9/0xb40 kernel/hung_task.c:274
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 21650 Comm: syz-executor.2 Not tainted 4.14.224-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880968c0180 task.stack: ffff888053b88000
RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:774 [inline]
RIP: 0010:__lock_acquire+0x119/0x3f20 kernel/locking/lockdep.c:3366
RSP: 0018:ffff888053b8f458 EFLAGS: 00000046
RAX: 1ffffffff11e1258 RBX: 0000000000000000 RCX: 0000000000000002
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff88f777c0
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffff8880968c0180 R12: ffffffff88f777c0
R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8beb5d40
FS: 00007f20f480a700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0100e5f88 CR3: 0000000096752000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
rcu_lock_acquire include/linux/rcupdate.h:242 [inline]
rcu_read_lock include/linux/rcupdate.h:629 [inline]
find_get_entry+0x45/0x630 mm/filemap.c:1352
pagecache_get_page+0x53/0xab0 mm/filemap.c:1465
find_get_page_flags include/linux/pagemap.h:282 [inline]
__find_get_block_slow fs/buffer.c:214 [inline]
__find_get_block+0x4cc/0xc40 fs/buffer.c:1357
__getblk_slow+0x127/0x7a0 fs/buffer.c:1100
__getblk_gfp fs/buffer.c:1383 [inline]
__bread_gfp+0x206/0x2e0 fs/buffer.c:1428
sb_bread include/linux/buffer_head.h:309 [inline]
udf_tread+0xe1/0x130 fs/udf/misc.c:44
udf_read_tagged+0x40/0x4c0 fs/udf/misc.c:210
udf_check_anchor_block+0x18a/0x590 fs/udf/super.c:1816
udf_scan_anchors+0x321/0x530 fs/udf/super.c:1878
udf_find_anchor fs/udf/super.c:1921 [inline]
udf_load_vrs+0x775/0xa90 fs/udf/super.c:1978
udf_fill_super+0x715/0x1680 fs/udf/super.c:2170
mount_bdev+0x2b3/0x360 fs/super.c:1134
mount_fs+0x92/0x2a0 fs/super.c:1237
vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
vfs_kern_mount fs/namespace.c:1036 [inline]
do_new_mount fs/namespace.c:2549 [inline]
do_mount+0xe53/0x2a00 fs/namespace.c:2879
SYSC_mount fs/namespace.c:3095 [inline]
SyS_mount+0xa8/0x120 fs/namespace.c:3072
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x465f69
RSP: 002b:00007f20f480a188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465f69
RDX: 0000000020000200 RSI: 0000000020000180 RDI: 0000000020000000
RBP: 00000000004bfa3f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008
R13: 00007fff502062bf R14: 00007f20f480a300 R15: 0000000000022000
Code: 44 8b 2d 7b f8 a9 0a 45 85 ed 75 3d 48 c7 c0 c0 92 f0 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 9f 2a 00 00 <48> 83 3d cf 2d af 07 00 0f 84 22 0e 00 00 9c 58 0f 1f 44 00 00