IPVS: ftp: loaded support on port[0] = 21 FAT-fs (loop2): bogus number of reserved sectors FAT-fs (loop2): Can't find a valid FAT filesystem ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ kworker/0:3/9297 is trying to acquire lock: 00000000525361f0 (&sb->s_type->i_mutex_key#22){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] 00000000525361f0 (&sb->s_type->i_mutex_key#22){+.+.}, at: __generic_file_fsync+0xb0/0x1f0 fs/libfs.c:989 but task is already holding lock: 00000000f114c5d2 ((work_completion)(&dio->complete_work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 ((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 -> #1 ((wq_completion)"dio/%s"sb->s_id){+.+.}: 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 -> #0 (&sb->s_type->i_mutex_key#22){+.+.}: down_write+0x34/0x90 kernel/locking/rwsem.c:70 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 other info that might help us debug this: Chain exists of: &sb->s_type->i_mutex_key#22 --> (wq_completion)"dio/%s"sb->s_id --> (work_completion)(&dio->complete_work) Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock((work_completion)(&dio->complete_work)); lock((wq_completion)"dio/%s"sb->s_id); lock((work_completion)(&dio->complete_work)); lock(&sb->s_type->i_mutex_key#22); *** DEADLOCK *** 2 locks held by kworker/0:3/9297: #0: 000000001e58acdb ((wq_completion)"dio/%s"sb->s_id){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000f114c5d2 ((work_completion)(&dio->complete_work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 stack backtrace: CPU: 0 PID: 9297 Comm: kworker/0:3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Workqueue: dio/loop5 dio_aio_complete_work 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 down_write+0x34/0x90 kernel/locking/rwsem.c:70 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 ldm_parse_privhead(): Cannot find PRIVHEAD structure. LDM database is corrupt. Aborting. ldm_validate_privheads(): Cannot find PRIVHEAD 1. loop4: p2 < > p4 loop4: p4 size 2097152 extends beyond EOD, truncated nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. IPVS: ftp: loaded support on port[0] = 21 ldm_parse_privhead(): Cannot find PRIVHEAD structure. LDM database is corrupt. Aborting. ldm_validate_privheads(): Cannot find PRIVHEAD 1. loop1: p2 < > p4 loop1: p4 size 2097152 extends beyond EOD, truncated FAT-fs (loop2): bogus number of reserved sectors audit: type=1804 audit(1663428866.091:67): pid=13067 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir2765342337/syzkaller.obGnpm/59/bus" dev="sda1" ino=14145 res=1 IPVS: ftp: loaded support on port[0] = 21 FAT-fs (loop2): Can't find a valid FAT filesystem audit: type=1804 audit(1663428866.091:68): pid=13070 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir2765342337/syzkaller.obGnpm/59/bus" dev="sda1" ino=14145 res=1 ldm_parse_privhead(): Cannot find PRIVHEAD structure. LDM database is corrupt. Aborting. MTD: Attempt to mount non-MTD device "/dev/loop5" cramfs: wrong magic ldm_validate_privheads(): Cannot find PRIVHEAD 1. loop1: p2 < > p4 audit: type=1800 audit(1663428866.421:69): pid=13151 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="file0" dev="sda1" ino=14138 res=0 loop1: p4 size 2097152 extends beyond EOD, truncated IPVS: ftp: loaded support on port[0] = 21 MTD: Attempt to mount non-MTD device "/dev/loop5" cramfs: wrong magic MTD: Attempt to mount non-MTD device "/dev/loop2" cramfs: wrong magic BTRFS info (device loop1): disk space caching is enabled BTRFS info (device loop1): has skinny extents MTD: Attempt to mount non-MTD device "/dev/loop5" cramfs: wrong magic BTRFS error (device loop1): bad tree block start, want 5246976 have 1343226050 BTRFS warning (device loop1): failed to read root (objectid=2): -5 audit: type=1800 audit(1663428867.211:70): pid=13288 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="file0" dev="sda1" ino=14134 res=0 9pnet: Insufficient options for proto=fd BTRFS error (device loop1): open_ctree failed audit: type=1800 audit(1663428867.651:71): pid=13316 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="file0" dev="sda1" ino=13890 res=0 audit: type=1800 audit(1663428867.851:72): pid=13317 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="file0" dev="sda1" ino=14045 res=0 audit: type=1800 audit(1663428868.881:73): pid=13338 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="file0" dev="sda1" ino=14154 res=0 audit: type=1800 audit(1663428869.212:74): pid=13345 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=14155 res=0