WARNING: possible circular locking dependency detected
4.14.306-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.2/12456 is trying to acquire lock:
("%s-%s""btrfs", name){+.+.}, at: [<ffffffff8135cb1b>] flush_workqueue+0xcb/0x1310 kernel/workqueue.c:2622
but task is already holding lock:
(&fs_info->scrub_lock){+.+.}, at: [<ffffffff82b1bd66>] btrfs_scrub_dev+0x506/0xcd0 fs/btrfs/scrub.c:4217
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&fs_info->scrub_lock){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
btrfs_scrub_dev+0x1f3/0xcd0 fs/btrfs/scrub.c:4150
btrfs_ioctl_scrub fs/btrfs/ioctl.c:4451 [inline]
btrfs_ioctl+0xba8/0x5b20 fs/btrfs/ioctl.c:5681
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x5e/0xd3
-> #2 (&fs_devs->device_list_mutex){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
__reada_start_machine fs/btrfs/reada.c:765 [inline]
reada_start_machine_worker+0x1d2/0xa90 fs/btrfs/reada.c:746
normal_work_helper+0x304/0x1330 fs/btrfs/async-thread.c:376
process_one_work+0x793/0x14a0 kernel/workqueue.c:2117
worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406
-> #1 ((&work->normal_work)){+.+.}:
process_one_work+0x736/0x14a0 kernel/workqueue.c:2093
worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406
-> #0 ("%s-%s""btrfs", name){+.+.}:
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
flush_workqueue+0xfa/0x1310 kernel/workqueue.c:2625
drain_workqueue+0x177/0x3e0 kernel/workqueue.c:2790
destroy_workqueue+0x71/0x710 kernel/workqueue.c:4116
__btrfs_destroy_workqueue fs/btrfs/async-thread.c:436 [inline]
btrfs_destroy_workqueue+0xf8/0x630 fs/btrfs/async-thread.c:447
scrub_workers_put+0x90/0x1a0 fs/btrfs/scrub.c:4075
btrfs_scrub_dev+0x536/0xcd0 fs/btrfs/scrub.c:4219
btrfs_ioctl_scrub fs/btrfs/ioctl.c:4451 [inline]
btrfs_ioctl+0xba8/0x5b20 fs/btrfs/ioctl.c:5681
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x5e/0xd3
other info that might help us debug this:
Chain exists of:
"%s-%s""btrfs", name --> &fs_devs->device_list_mutex --> &fs_info->scrub_lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&fs_info->scrub_lock);
lock(&fs_devs->device_list_mutex);
lock(&fs_info->scrub_lock);
lock("%s-%s""btrfs", name);
*** DEADLOCK ***
1 lock held by syz-executor.2/12456:
#0: (&fs_info->scrub_lock){+.+.}, at: [<ffffffff82b1bd66>] btrfs_scrub_dev+0x506/0xcd0 fs/btrfs/scrub.c:4217
stack backtrace:
CPU: 0 PID: 12456 Comm: syz-executor.2 Not tainted 4.14.306-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x281 lib/dump_stack.c:58
print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258
check_prev_add kernel/locking/lockdep.c:1905 [inline]
check_prevs_add kernel/locking/lockdep.c:2022 [inline]
validate_chain kernel/locking/lockdep.c:2464 [inline]
__lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
flush_workqueue+0xfa/0x1310 kernel/workqueue.c:2625
drain_workqueue+0x177/0x3e0 kernel/workqueue.c:2790
destroy_workqueue+0x71/0x710 kernel/workqueue.c:4116
__btrfs_destroy_workqueue fs/btrfs/async-thread.c:436 [inline]
btrfs_destroy_workqueue+0xf8/0x630 fs/btrfs/async-thread.c:447
scrub_workers_put+0x90/0x1a0 fs/btrfs/scrub.c:4075
btrfs_scrub_dev+0x536/0xcd0 fs/btrfs/scrub.c:4219
btrfs_ioctl_scrub fs/btrfs/ioctl.c:4451 [inline]
btrfs_ioctl+0xba8/0x5b20 fs/btrfs/ioctl.c:5681
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f7124c8e0f9
RSP: 002b:00007f7123200168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7124dadf80 RCX: 00007f7124c8e0f9
RDX: 0000000020000100 RSI: 00000000c400941b RDI: 0000000000000004
RBP: 00007f7124ce9ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffa9a1806f R14: 00007f7123200300 R15: 0000000000022000
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000)
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000)
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000)
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000)
BTRFS info (device loop2): enabling inode map caching
BTRFS info (device loop2): trying to use backup root at mount time
BTRFS info (device loop2): use zlib compression
BTRFS info (device loop2): enabling ssd optimizations
BTRFS info (device loop2): using spread ssd allocation scheme
BTRFS info (device loop2): using free space tree
BTRFS info (device loop2): has skinny extents
print_req_error: I/O error, dev loop3, sector 0
print_req_error: I/O error, dev loop3, sector 0
Buffer I/O error on dev loop3, logical block 0, async page read
print_req_error: I/O error, dev loop3, sector 0
Buffer I/O error on dev loop3, logical block 0, async page read
print_req_error: I/O error, dev loop3, sector 0
Buffer I/O error on dev loop3, logical block 0, async page read
print_req_error: I/O error, dev loop3, sector 0
Buffer I/O error on dev loop3, logical block 0, async page read
print_req_error: I/O error, dev loop3, sector 0
Buffer I/O error on dev loop3, logical block 0, async page read
print_req_error: I/O error, dev loop3, sector 0
Buffer I/O error on dev loop3, logical block 0, async page read
print_req_error: I/O error, dev loop3, sector 24
Buffer I/O error on dev loop3, logical block 3, async page read
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000)
BTRFS info (device loop2): enabling inode map caching
BTRFS info (device loop2): trying to use backup root at mount time
BTRFS info (device loop2): use zlib compression
BTRFS info (device loop2): enabling ssd optimizations
BTRFS info (device loop2): using spread ssd allocation scheme
BTRFS info (device loop2): using free space tree
BTRFS info (device loop2): has skinny extents
EXT4-fs (loop3): invalid inodes per group: 204800
print_req_error: I/O error, dev loop3, sector 0
Buffer I/O error on dev loop3, logical block 0, async page read
print_req_error: I/O error, dev loop3, sector 4
Buffer I/O error on dev loop3, logical block 2, async page read
Buffer I/O error on dev loop3, logical block 3, async page read
EXT4-fs (loop1): Ignoring removed nobh option
EXT4-fs (loop1): Ignoring removed mblk_io_submit option
EXT4-fs (loop1): Ignoring removed nobh option
EXT4-fs (loop1): Unsupported blocksize for fs encryption
EXT4-fs (loop3): invalid inodes per group: 204800
BTRFS info (device loop5): enabling inode map caching
BTRFS info (device loop5): trying to use backup root at mount time
BTRFS info (device loop5): use zlib compression
BTRFS info (device loop5): enabling ssd optimizations
BTRFS info (device loop5): using spread ssd allocation scheme
BTRFS info (device loop5): using free space tree
BTRFS info (device loop5): has skinny extents
mmap: syz-executor.0 (12786) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt.
EXT4-fs (loop3): invalid inodes per group: 204800
EXT4-fs (loop1): Ignoring removed nobh option
EXT4-fs (loop1): Ignoring removed mblk_io_submit option
hfs: unable to open extent tree
hfs: can't find a HFS filesystem on dev loop4
EXT4-fs (loop1): Ignoring removed nobh option
EXT4-fs (loop1): Unsupported blocksize for fs encryption
EXT4-fs (loop3): invalid inodes per group: 204800
hfs: unable to open extent tree
hfs: can't find a HFS filesystem on dev loop4
BTRFS info (device loop5): enabling inode map caching
BTRFS info (device loop5): trying to use backup root at mount time
BTRFS info (device loop5): use zlib compression
hfs: unable to open extent tree
BTRFS info (device loop5): enabling ssd optimizations
hfs: can't find a HFS filesystem on dev loop4
BTRFS info (device loop5): using spread ssd allocation scheme
BTRFS info (device loop5): using free space tree
BTRFS info (device loop5): has skinny extents
hfs: unable to open extent tree
hfs: can't find a HFS filesystem on dev loop4
EXT4-fs (loop1): Ignoring removed nobh option
EXT4-fs (loop1): Ignoring removed mblk_io_submit option
EXT4-fs (loop1): Ignoring removed nobh option
EXT4-fs (loop1): Unsupported blocksize for fs encryption
EXT4-fs (loop1): Ignoring removed nobh option
EXT4-fs (loop1): Ignoring removed mblk_io_submit option
EXT4-fs (loop1): Ignoring removed nobh option
EXT4-fs (loop1): Unsupported blocksize for fs encryption