====================================================== WARNING: possible circular locking dependency detected 4.14.195-syzkaller #0 Not tainted ------------------------------------------------------ kworker/0:3/6056 is trying to acquire lock: (&sb->s_type->i_mutex_key#9){++++}, at: [] inode_lock include/linux/fs.h:719 [inline] (&sb->s_type->i_mutex_key#9){++++}, at: [] __generic_file_fsync+0x9e/0x190 fs/libfs.c:987 but task is already holding lock: ((&dio->complete_work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 ((&dio->complete_work)){+.+.}: process_one_work+0x736/0x14a0 kernel/workqueue.c:2092 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 -> #1 ("dio/%s"sb->s_id){+.+.}: flush_workqueue+0xfa/0x1310 kernel/workqueue.c:2624 drain_workqueue+0x177/0x3e0 kernel/workqueue.c:2789 destroy_workqueue+0x71/0x710 kernel/workqueue.c:4102 sb_init_dio_done_wq+0x61/0x80 fs/direct-io.c:635 dio_set_defer_completion fs/direct-io.c:647 [inline] get_more_blocks fs/direct-io.c:725 [inline] do_direct_IO fs/direct-io.c:1003 [inline] do_blockdev_direct_IO fs/direct-io.c:1336 [inline] __blockdev_direct_IO+0x77db/0xdc60 fs/direct-io.c:1422 ext4_direct_IO_write fs/ext4/inode.c:3716 [inline] ext4_direct_IO+0x888/0x1b80 fs/ext4/inode.c:3857 generic_file_direct_write+0x1df/0x420 mm/filemap.c:2950 __generic_file_write_iter+0x2a2/0x590 mm/filemap.c:3129 ext4_file_write_iter+0x276/0xd20 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1778 [inline] aio_write+0x2ed/0x560 fs/aio.c:1553 io_submit_one fs/aio.c:1641 [inline] do_io_submit+0x847/0x13e0 fs/aio.c:1709 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (&sb->s_type->i_mutex_key#9){++++}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 down_write+0x34/0x90 kernel/locking/rwsem.c:54 inode_lock include/linux/fs.h:719 [inline] __generic_file_fsync+0x9e/0x190 fs/libfs.c:987 ext4_sync_file+0x8ed/0x12c0 fs/ext4/fsync.c:118 vfs_fsync_range+0x103/0x260 fs/sync.c:196 generic_write_sync include/linux/fs.h:2678 [inline] dio_complete+0x561/0x8d0 fs/direct-io.c:330 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 other info that might help us debug this: Chain exists of: &sb->s_type->i_mutex_key#9 --> "dio/%s"sb->s_id --> (&dio->complete_work) Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock((&dio->complete_work)); lock("dio/%s"sb->s_id); lock((&dio->complete_work)); lock(&sb->s_type->i_mutex_key#9); *** DEADLOCK *** 2 locks held by kworker/0:3/6056: #0: ("dio/%s"sb->s_id){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 #1: ((&dio->complete_work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 stack backtrace: CPU: 0 PID: 6056 Comm: kworker/0:3 Not tainted 4.14.195-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: dio/sda1 dio_aio_complete_work Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 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_write+0x34/0x90 kernel/locking/rwsem.c:54 inode_lock include/linux/fs.h:719 [inline] __generic_file_fsync+0x9e/0x190 fs/libfs.c:987 ext4_sync_file+0x8ed/0x12c0 fs/ext4/fsync.c:118 vfs_fsync_range+0x103/0x260 fs/sync.c:196 generic_write_sync include/linux/fs.h:2678 [inline] dio_complete+0x561/0x8d0 fs/direct-io.c:330 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Cannot find add_set index 0 as target ip6_tables: ip6tables: counters copy to user failed while replacing table Cannot find add_set index 0 as target ip6_tables: ip6tables: counters copy to user failed while replacing table netlink: 20 bytes leftover after parsing attributes in process `syz-executor.0'. print_req_error: 102 callbacks suppressed print_req_error: I/O error, dev loop2, sector 1 print_req_error: I/O error, dev loop2, sector 264064 print_req_error: I/O error, dev loop2, sector 1 buffer_io_error: 78 callbacks suppressed Buffer I/O error on dev loop2p1, logical block 0, async page read print_req_error: I/O error, dev loop2, sector 0 print_req_error: I/O error, dev loop2, sector 1 Buffer I/O error on dev loop2p1, logical block 0, async page read print_req_error: I/O error, dev loop2, sector 32640 print_req_error: I/O error, dev loop2, sector 1 Buffer I/O error on dev loop2p1, logical block 0, async page read print_req_error: I/O error, dev loop2, sector 0 Buffer I/O error on dev loop2p3, logical block 0, async page read print_req_error: I/O error, dev loop2, sector 32640 Buffer I/O error on dev loop2p4, logical block 4080, async page read print_req_error: I/O error, dev loop2, sector 0 Buffer I/O error on dev loop2p3, logical block 0, async page read Buffer I/O error on dev loop2p1, logical block 0, async page read Buffer I/O error on dev loop2p3, logical block 0, async page read Buffer I/O error on dev loop2p3, logical block 0, async page read Buffer I/O error on dev loop2p1, logical block 0, async page read audit: type=1326 audit(1598980830.830:193): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=19637 comm="syz-executor.0" exe="/root/syz-executor.0" sig=9 arch=c000003e syscall=228 compat=0 ip=0x4603fa code=0x0 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 40 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 40 bytes leftover after parsing attributes in process `syz-executor.3'. ieee80211 phy15: Selected rate control algorithm 'minstrel_ht' ieee80211 phy15: hwaddr 02:00:00:00:0f:00 registered ieee80211 phy16: Selected rate control algorithm 'minstrel_ht' ieee80211 phy16: hwaddr 02:00:00:00:10:00 registered tmpfs: Bad value 'default=relative:' for mount option 'mpol' IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 XFS (loop2): unknown mount option [rtdevE­¼÷ê./file0]. audit: type=1326 audit(1598980835.220:194): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=19913 comm="syz-executor.4" exe="/root/syz-executor.4" sig=9 arch=c000003e syscall=228 compat=0 ip=0x4603fa code=0x0 XFS (loop2): unknown mount option [rtdevE­¼÷ê./file0]. overlayfs: failed to resolve './file003æ_•ÏîÒÖî ': -2 overlayfs: failed to resolve './file003æ_•ÏîÒÖî ': -2 md: could not open unknown-block(8,2). md: md_import_device returned -6 print_req_error: 186 callbacks suppressed print_req_error: I/O error, dev loop2, sector 1 print_req_error: I/O error, dev loop2, sector 1 buffer_io_error: 144 callbacks suppressed Buffer I/O error on dev loop2p1, logical block 0, async page read print_req_error: I/O error, dev loop2, sector 264064 print_req_error: I/O error, dev loop2, sector 1 Buffer I/O error on dev loop2p1, logical block 0, async page read print_req_error: I/O error, dev loop2, sector 264064 Buffer I/O error on dev loop2p2, logical block 33008, async page read print_req_error: I/O error, dev loop2, sector 0 print_req_error: I/O error, dev loop2, sector 1 Buffer I/O error on dev loop2p1, logical block 0, async page read print_req_error: I/O error, dev loop2, sector 0 Buffer I/O error on dev loop2p3, logical block 0, async page read print_req_error: I/O error, dev loop2, sector 0 print_req_error: I/O error, dev loop2, sector 1 Buffer I/O error on dev loop2p3, logical block 0, async page read Buffer I/O error on dev loop2p1, logical block 0, async page read Buffer I/O error on dev loop2p3, logical block 0, async page read audit: type=1326 audit(1598980835.991:195): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=19913 comm="syz-executor.4" exe="/root/syz-executor.4" sig=9 arch=c000003e syscall=228 compat=0 ip=0x4603fa code=0x0 Buffer I/O error on dev loop2p3, logical block 0, async page read Buffer I/O error on dev loop2p5, logical block 33008, async page read netlink: 28 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 28 bytes leftover after parsing attributes in process `syz-executor.1'.