====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/22757 is trying to acquire lock: 00000000075082f1 ((wq_completion)"dio/%s"sb->s_id){+.+.}, at: flush_workqueue+0xe8/0x13e0 kernel/workqueue.c:2658 but task is already holding lock: 000000004d04d121 (&sb->s_type->i_mutex_key#22){++++}, at: inode_lock include/linux/fs.h:748 [inline] 000000004d04d121 (&sb->s_type->i_mutex_key#22){++++}, at: generic_file_write_iter+0x99/0x730 mm/filemap.c:3320 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&sb->s_type->i_mutex_key#22){++++}: inode_lock include/linux/fs.h:748 [inline] __generic_file_fsync+0xb0/0x1f0 fs/libfs.c:989 fat_file_fsync+0x73/0x200 fs/fat/file.c:198 vfs_fsync_range+0x13a/0x220 fs/sync.c:197 generic_write_sync include/linux/fs.h:2750 [inline] dio_complete+0x763/0xac0 fs/direct-io.c:329 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 -> #1 ((work_completion)(&dio->complete_work)){+.+.}: worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 -> #0 ((wq_completion)"dio/%s"sb->s_id){+.+.}: flush_workqueue+0x117/0x13e0 kernel/workqueue.c:2661 drain_workqueue+0x1a5/0x460 kernel/workqueue.c:2826 destroy_workqueue+0x75/0x790 kernel/workqueue.c:4183 __alloc_workqueue_key+0xb76/0xed0 kernel/workqueue.c:4160 sb_init_dio_done_wq+0x34/0x90 fs/direct-io.c:623 do_blockdev_direct_IO fs/direct-io.c:1285 [inline] __blockdev_direct_IO+0x5f55/0xef40 fs/direct-io.c:1419 blockdev_direct_IO include/linux/fs.h:3059 [inline] fat_direct_IO+0x1d1/0x370 fs/fat/inode.c:282 generic_file_direct_write+0x208/0x4a0 mm/filemap.c:3073 __generic_file_write_iter+0x2d0/0x610 mm/filemap.c:3252 generic_file_write_iter+0x3f8/0x730 mm/filemap.c:3323 call_write_iter include/linux/fs.h:1821 [inline] aio_write+0x37f/0x5c0 fs/aio.c:1574 __io_submit_one fs/aio.c:1858 [inline] io_submit_one+0xecd/0x20c0 fs/aio.c:1909 __do_sys_io_submit fs/aio.c:1953 [inline] __se_sys_io_submit+0x11b/0x4a0 fs/aio.c:1924 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: (wq_completion)"dio/%s"sb->s_id --> (work_completion)(&dio->complete_work) --> &sb->s_type->i_mutex_key#22 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#22); lock((work_completion)(&dio->complete_work)); lock(&sb->s_type->i_mutex_key#22); lock((wq_completion)"dio/%s"sb->s_id); *** DEADLOCK *** 1 lock held by syz-executor.5/22757: #0: 000000004d04d121 (&sb->s_type->i_mutex_key#22){++++}, at: inode_lock include/linux/fs.h:748 [inline] #0: 000000004d04d121 (&sb->s_type->i_mutex_key#22){++++}, at: generic_file_write_iter+0x99/0x730 mm/filemap.c:3320 stack backtrace: CPU: 0 PID: 22757 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 flush_workqueue+0x117/0x13e0 kernel/workqueue.c:2661 drain_workqueue+0x1a5/0x460 kernel/workqueue.c:2826 destroy_workqueue+0x75/0x790 kernel/workqueue.c:4183 __alloc_workqueue_key+0xb76/0xed0 kernel/workqueue.c:4160 sb_init_dio_done_wq+0x34/0x90 fs/direct-io.c:623 do_blockdev_direct_IO fs/direct-io.c:1285 [inline] __blockdev_direct_IO+0x5f55/0xef40 fs/direct-io.c:1419 blockdev_direct_IO include/linux/fs.h:3059 [inline] fat_direct_IO+0x1d1/0x370 fs/fat/inode.c:282 generic_file_direct_write+0x208/0x4a0 mm/filemap.c:3073 __generic_file_write_iter+0x2d0/0x610 mm/filemap.c:3252 generic_file_write_iter+0x3f8/0x730 mm/filemap.c:3323 call_write_iter include/linux/fs.h:1821 [inline] aio_write+0x37f/0x5c0 fs/aio.c:1574 __io_submit_one fs/aio.c:1858 [inline] io_submit_one+0xecd/0x20c0 fs/aio.c:1909 __do_sys_io_submit fs/aio.c:1953 [inline] __se_sys_io_submit+0x11b/0x4a0 fs/aio.c:1924 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fc22466f409 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc222fe4168 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 00007fc224781f80 RCX: 00007fc22466f409 RDX: 0000000020000540 RSI: 0000000000001801 RDI: 00007fc22475d000 RBP: 00007fc2246ca367 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdadbe28bf R14: 00007fc222fe4300 R15: 0000000000022000 IPVS: ftp: loaded support on port[0] = 21 overlayfs: unrecognized mount option "workdib=òfile1" or missing value FAT-fs (loop5): Unrecognized mount option "./file0" or missing value IPVS: ftp: loaded support on port[0] = 21 overlayfs: unrecognized mount option "workdib=òfile1" or missing value IPVS: ftp: loaded support on port[0] = 21 overlayfs: unrecognized mount option "workdib=òfile1" or missing value overlayfs: unrecognized mount option "workdib=òfile1" or missing value overlayfs: unrecognized mount option "workdib=òfile1" or missing value overlayfs: unrecognized mount option "workdib=òfile1" or missing value ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 tmpfs: No value for mount option './file1' overlayfs: unrecognized mount option "workdib=òfile1" or missing value overlayfs: unrecognized mount option "workdib=òfile1" or missing value netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 500 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 300 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 500 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 300 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 500 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 300 bytes leftover after parsing attributes in process `syz-executor.1'.