====================================================== WARNING: possible circular locking dependency detected 4.14.302-syzkaller #0 Not tainted ------------------------------------------------------ kworker/u4:2/84 is trying to acquire lock: (&rl->lock){++++}, at: [] ntfs_read_block fs/ntfs/aops.c:269 [inline] (&rl->lock){++++}, at: [] ntfs_readpage+0x1396/0x1ad0 fs/ntfs/aops.c:456 but task is already holding lock: ip_tables: iptables: counters copy to user failed while replacing table (&ni->mrec_lock){+.+.}, at: [] map_mft_record+0x2b/0xbe0 fs/ntfs/mft.c:166 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ni->mrec_lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 map_mft_record+0x2b/0xbe0 fs/ntfs/mft.c:166 ntfs_attr_extend_allocation+0x1e5/0x2f80 fs/ntfs/attrib.c:2016 ntfs_prepare_file_for_write fs/ntfs/file.c:412 [inline] ntfs_file_write_iter+0x61b/0x1f70 fs/ntfs/file.c:1949 call_write_iter include/linux/fs.h:1780 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x44c/0x630 fs/read_write.c:482 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 -> #0 (&rl->lock){++++}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 down_read+0x36/0x80 kernel/locking/rwsem.c:24 ntfs_read_block fs/ntfs/aops.c:269 [inline] ntfs_readpage+0x1396/0x1ad0 fs/ntfs/aops.c:456 do_read_cache_page+0x38e/0xc10 mm/filemap.c:2713 read_mapping_page include/linux/pagemap.h:398 [inline] ntfs_map_page fs/ntfs/aops.h:89 [inline] ntfs_sync_mft_mirror+0x1f4/0x1560 fs/ntfs/mft.c:490 write_mft_record_nolock+0xece/0x1240 fs/ntfs/mft.c:793 write_mft_record fs/ntfs/mft.h:109 [inline] __ntfs_write_inode+0x58d/0xcc0 fs/ntfs/inode.c:3084 write_inode fs/fs-writeback.c:1241 [inline] __writeback_single_inode+0x6a4/0x1010 fs/fs-writeback.c:1439 writeback_sb_inodes+0x48b/0xd30 fs/fs-writeback.c:1645 wb_writeback+0x243/0xb80 fs/fs-writeback.c:1820 wb_do_writeback fs/fs-writeback.c:1952 [inline] wb_workfn+0x2bd/0xf50 fs/fs-writeback.c:1988 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 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ni->mrec_lock); lock(&rl->lock); lock(&ni->mrec_lock); lock(&rl->lock); *** DEADLOCK *** 3 locks held by kworker/u4:2/84: #0: ("writeback"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: ((&(&wb->dwork)->work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 #2: (&ni->mrec_lock){+.+.}, at: [] map_mft_record+0x2b/0xbe0 fs/ntfs/mft.c:166 stack backtrace: CPU: 1 PID: 84 Comm: kworker/u4:2 Not tainted 4.14.302-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: writeback wb_workfn (flush-7:0) 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 down_read+0x36/0x80 kernel/locking/rwsem.c:24 ntfs_read_block fs/ntfs/aops.c:269 [inline] ntfs_readpage+0x1396/0x1ad0 fs/ntfs/aops.c:456 do_read_cache_page+0x38e/0xc10 mm/filemap.c:2713 read_mapping_page include/linux/pagemap.h:398 [inline] ntfs_map_page fs/ntfs/aops.h:89 [inline] ntfs_sync_mft_mirror+0x1f4/0x1560 fs/ntfs/mft.c:490 write_mft_record_nolock+0xece/0x1240 fs/ntfs/mft.c:793 write_mft_record fs/ntfs/mft.h:109 [inline] __ntfs_write_inode+0x58d/0xcc0 fs/ntfs/inode.c:3084 write_inode fs/fs-writeback.c:1241 [inline] __writeback_single_inode+0x6a4/0x1010 fs/fs-writeback.c:1439 writeback_sb_inodes+0x48b/0xd30 fs/fs-writeback.c:1645 wb_writeback+0x243/0xb80 fs/fs-writeback.c:1820 wb_do_writeback fs/fs-writeback.c:1952 [inline] wb_workfn+0x2bd/0xf50 fs/fs-writeback.c:1988 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 syz-executor.2 (9937): drop_caches: 1 ntfs: volume version 3.1. ntfs: volume version 3.1. unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'. syz-executor.2 (9937): drop_caches: 1 ntfs: volume version 3.1. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'. syz-executor.2 (10000): drop_caches: 1 ntfs: volume version 3.1. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'. syz-executor.2 (10000): drop_caches: 1 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'. syz-executor.2 (10134): drop_caches: 1 syz-executor.2 (10134): drop_caches: 1 9pnet: Insufficient options for proto=fd NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 4096) NILFS (loop5): mounting unchecked fs NILFS (loop5): recovery required for readonly filesystem NILFS (loop5): write access will be enabled during recovery NILFS (loop5): recovery complete NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 4096) NILFS (loop5): mounting unchecked fs NILFS (loop5): recovery required for readonly filesystem NILFS (loop5): write access will be enabled during recovery NILFS (loop5): recovery complete syz-executor.3 (10272) used greatest stack depth: 24776 bytes left NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 4096) NILFS (loop5): mounting unchecked fs NILFS (loop5): recovery required for readonly filesystem NILFS (loop5): write access will be enabled during recovery NILFS (loop5): recovery complete NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 4096) UDF-fs: error (device loop2): udf_read_tagged: tag version 0x0000 != 0x0002 || 0x0003, block 0 UDF-fs: error (device loop2): udf_read_tagged: tag version 0x0000 != 0x0002 || 0x0003, block 0 NILFS (loop5): mounting unchecked fs UDF-fs: error (device loop2): udf_read_tagged: tag version 0x0000 != 0x0002 || 0x0003, block 0 NILFS (loop5): recovery required for readonly filesystem UDF-fs: warning (device loop2): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 512 failed UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) NILFS (loop5): write access will be enabled during recovery overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: upper fs needs to support d_type. NILFS (loop5): recovery complete overlayfs: upper fs does not support xattr. UDF-fs: error (device loop2): udf_read_tagged: tag version 0x0000 != 0x0002 || 0x0003, block 0 UDF-fs: error (device loop2): udf_read_tagged: tag version 0x0000 != 0x0002 || 0x0003, block 0 UDF-fs: error (device loop2): udf_read_tagged: tag version 0x0000 != 0x0002 || 0x0003, block 0 UDF-fs: warning (device loop2): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 512 failed EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) EXT4-fs error (device loop5): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 25 vs 150994969 free clusters overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: upper fs needs to support d_type. overlayfs: upper fs does not support xattr. netlink: 28 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 28 bytes leftover after parsing attributes in process `syz-executor.1'. EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue UDF-fs: error (device loop2): udf_read_tagged: tag version 0x0000 != 0x0002 || 0x0003, block 0 EXT4-fs error (device loop5): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 25 vs 150994969 free clusters UDF-fs: error (device loop2): udf_read_tagged: tag version 0x0000 != 0x0002 || 0x0003, block 0 UDF-fs: error (device loop2): udf_read_tagged: tag version 0x0000 != 0x0002 || 0x0003, block 0 netlink: 28 bytes leftover after parsing attributes in process `syz-executor.1'. UDF-fs: warning (device loop2): udf_load_vrs: No anchor found netlink: 28 bytes leftover after parsing attributes in process `syz-executor.1'. UDF-fs: Scanning with blocksize 512 failed UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: upper fs needs to support d_type. overlayfs: upper fs does not support xattr. EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop5): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 25 vs 150994969 free clusters UDF-fs: error (device loop2): udf_read_tagged: tag version 0x0000 != 0x0002 || 0x0003, block 0 UDF-fs: error (device loop2): udf_read_tagged: tag version 0x0000 != 0x0002 || 0x0003, block 0 UDF-fs: error (device loop2): udf_read_tagged: tag version 0x0000 != 0x0002 || 0x0003, block 0 UDF-fs: warning (device loop2): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 512 failed UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: upper fs needs to support d_type. overlayfs: upper fs does not support xattr. EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop5): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 25 vs 150994969 free clusters netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 32 bytes leftover after parsing attributes in process `syz-executor.3'. Zero length message leads to an empty skb netlink: 32 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 32 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 32 bytes leftover after parsing attributes in process `syz-executor.3'.