WARNING: possible circular locking dependency detected attempt to access beyond end of device 4.19.199-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/10904 is trying to acquire lock: 0000000040005cae ((wq_completion)"dio/%s"sb->s_id){+.+.}, at: flush_workqueue+0xe8/0x13e0 kernel/workqueue.c:2658 loop1: rw=2049, want=80, limit=16 but task is already holding lock: 000000008805768d (&sb->s_type->i_mutex_key#10){++++}, at: inode_trylock include/linux/fs.h:768 [inline] 000000008805768d (&sb->s_type->i_mutex_key#10){++++}, at: ext4_file_write_iter+0x21f/0xf20 fs/ext4/file.c:238 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&sb->s_type->i_mutex_key#10){++++}: inode_lock include/linux/fs.h:748 [inline] __generic_file_fsync+0xb0/0x1f0 fs/libfs.c:989 ext4_sync_file+0xa35/0x1420 fs/ext4/fsync.c:118 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:4177 sb_init_dio_done_wq+0x72/0x90 fs/direct-io.c:634 do_blockdev_direct_IO fs/direct-io.c:1285 [inline] __blockdev_direct_IO+0x5f55/0xef40 fs/direct-io.c:1419 ext4_direct_IO_write fs/ext4/inode.c:3777 [inline] ext4_direct_IO+0xae4/0x1c50 fs/ext4/inode.c:3915 generic_file_direct_write+0x208/0x4a0 mm/filemap.c:3073 __generic_file_write_iter+0x2d0/0x610 mm/filemap.c:3252 ext4_file_write_iter+0x2fe/0xf20 fs/ext4/file.c:272 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#10 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#10); lock((work_completion)(&dio->complete_work)); lock(&sb->s_type->i_mutex_key#10); lock((wq_completion)"dio/%s"sb->s_id); *** DEADLOCK *** 1 lock held by syz-executor.4/10904: #0: 000000008805768d (&sb->s_type->i_mutex_key#10){++++}, at: inode_trylock include/linux/fs.h:768 [inline] #0: 000000008805768d (&sb->s_type->i_mutex_key#10){++++}, at: ext4_file_write_iter+0x21f/0xf20 fs/ext4/file.c:238 stack backtrace: CPU: 0 PID: 10904 Comm: syz-executor.4 Not tainted 4.19.199-syzkaller #0 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+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:4177 sb_init_dio_done_wq+0x72/0x90 fs/direct-io.c:634 do_blockdev_direct_IO fs/direct-io.c:1285 [inline] __blockdev_direct_IO+0x5f55/0xef40 fs/direct-io.c:1419 ext4_direct_IO_write fs/ext4/inode.c:3777 [inline] ext4_direct_IO+0xae4/0x1c50 fs/ext4/inode.c:3915 generic_file_direct_write+0x208/0x4a0 mm/filemap.c:3073 __generic_file_write_iter+0x2d0/0x610 mm/filemap.c:3252 ext4_file_write_iter+0x2fe/0xf20 fs/ext4/file.c:272 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: 0033:0x4665e9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007feba34e1188 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9 RDX: 0000000020000540 RSI: 0000000000000002 RDI: 00007feba34b8000 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffc8e2ad96f R14: 00007feba34e1300 R15: 0000000000022000 attempt to access beyond end of device loop0: rw=2049, want=184, limit=16 attempt to access beyond end of device attempt to access beyond end of device attempt to access beyond end of device loop5: rw=1, want=256, limit=16 loop3: rw=2049, want=184, limit=16 loop1: rw=2049, want=81, limit=16 attempt to access beyond end of device loop1: rw=2049, want=82, limit=16 attempt to access beyond end of device loop1: rw=2049, want=84, limit=16 attempt to access beyond end of device loop1: rw=2049, want=85, limit=16 attempt to access beyond end of device loop1: rw=2049, want=86, limit=16 attempt to access beyond end of device loop1: rw=2049, want=87, limit=16 attempt to access beyond end of device attempt to access beyond end of device loop1: rw=2049, want=88, limit=16 attempt to access beyond end of device loop1: rw=2049, want=89, limit=16 attempt to access beyond end of device loop1: rw=2049, want=185, limit=16 loop0: rw=1, want=256, limit=16 attempt to access beyond end of device loop3: rw=1, want=256, limit=16 attempt to access beyond end of device loop1: rw=1, want=257, limit=16 attempt to access beyond end of device loop2: rw=2049, want=184, limit=16 attempt to access beyond end of device loop3: rw=2049, want=184, limit=16 attempt to access beyond end of device loop0: rw=2049, want=184, limit=16 attempt to access beyond end of device loop2: rw=1, want=256, limit=16 attempt to access beyond end of device attempt to access beyond end of device loop1: rw=2049, want=184, limit=16 loop4: rw=2049, want=184, limit=16 attempt to access beyond end of device loop3: rw=1, want=256, limit=16 attempt to access beyond end of device loop0: rw=1, want=256, limit=16 attempt to access beyond end of device loop1: rw=1, want=256, limit=16 attempt to access beyond end of device loop4: rw=1, want=256, limit=16 attempt to access beyond end of device loop0: rw=2049, want=184, limit=16 attempt to access beyond end of device loop1: rw=2049, want=184, limit=16 attempt to access beyond end of device loop0: rw=1, want=256, limit=16 attempt to access beyond end of device loop4: rw=2049, want=184, limit=16 attempt to access beyond end of device loop1: rw=1, want=256, limit=16 Cannot find map_set index 0 as target Cannot find map_set index 0 as target attempt to access beyond end of device loop4: rw=1, want=256, limit=16 Cannot find map_set index 0 as target Cannot find map_set index 0 as target attempt to access beyond end of device loop4: rw=2049, want=184, limit=16 attempt to access beyond end of device loop1: rw=2049, want=184, limit=16 Cannot find map_set index 0 as target attempt to access beyond end of device loop4: rw=1, want=256, limit=16 attempt to access beyond end of device loop1: rw=1, want=256, limit=16