====================================================== WARNING: possible circular locking dependency detected 5.19.0-syzkaller-13930-g7ebfc85e2cd7 #0 Not tainted ------------------------------------------------------ syz-executor.1/6130 is trying to acquire lock: ffff88814b25cbd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x1e7/0x3be0 fs/ext4/inode.c:2687 but task is already holding lock: ffff88803dd0ca38 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:771 [inline] ffff88803dd0ca38 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_dio_read_iter fs/ext4/file.c:63 [inline] ffff88803dd0ca38 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_file_read_iter+0x26b/0x740 fs/ext4/file.c:130 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&sb->s_type->i_mutex_key#7){++++}-{3:3}: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5666 down_read+0x39/0x50 kernel/locking/rwsem.c:1499 inode_lock_shared include/linux/fs.h:771 [inline] ext4_bmap+0x55/0x410 fs/ext4/inode.c:3157 bmap+0xa1/0xd0 fs/inode.c:1799 jbd2_journal_bmap fs/jbd2/journal.c:971 [inline] __jbd2_journal_erase fs/jbd2/journal.c:1784 [inline] jbd2_journal_flush+0x5d0/0xca0 fs/jbd2/journal.c:2490 ext4_ioctl_checkpoint fs/ext4/ioctl.c:1082 [inline] __ext4_ioctl fs/ext4/ioctl.c:1586 [inline] ext4_ioctl+0x378a/0x55c0 fs/ext4/ioctl.c:1606 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (&journal->j_checkpoint_mutex){+.+.}-{3:3}: lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5666 __mutex_lock_common+0x1de/0x26c0 kernel/locking/mutex.c:603 mutex_lock_io_nested+0x43/0x60 kernel/locking/mutex.c:833 __jbd2_log_wait_for_space+0x22d/0x790 fs/jbd2/checkpoint.c:110 add_transaction_credits+0x936/0xbf0 fs/jbd2/transaction.c:298 start_this_handle+0x758/0x1660 fs/jbd2/transaction.c:422 jbd2__journal_start+0x2ca/0x5b0 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x111/0x1d0 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_writepages+0x1181/0x3be0 fs/ext4/inode.c:2810 do_writepages+0x3c3/0x690 mm/page-writeback.c:2468 filemap_fdatawrite_wbc+0x11e/0x170 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] file_write_and_wait_range+0x1e7/0x2f0 mm/filemap.c:773 ext4_sync_file+0x1b0/0x850 fs/ext4/fsync.c:151 generic_write_sync include/linux/fs.h:2874 [inline] ext4_buffered_write_iter+0x308/0x3a0 fs/ext4/file.c:277 ext4_file_write_iter+0xabb/0x1ae0 do_iter_write+0x6f0/0xc50 fs/read_write.c:855 iter_file_splice_write+0x830/0xff0 fs/splice.c:686 do_splice_from fs/splice.c:764 [inline] direct_splice_actor+0xe6/0x1c0 fs/splice.c:931 splice_direct_to_actor+0x4e4/0xc00 fs/splice.c:886 do_splice_direct+0x2a0/0x3f0 fs/splice.c:974 do_sendfile+0x641/0xfd0 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1311 [inline] __se_sys_sendfile64+0xfc/0x1e0 fs/read_write.c:1303 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&sbi->s_writepages_rwsem){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain+0x1872/0x6600 kernel/locking/lockdep.c:3829 __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5053 lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5666 percpu_down_read+0x44/0x190 include/linux/percpu-rwsem.h:51 ext4_writepages+0x1e7/0x3be0 fs/ext4/inode.c:2687 do_writepages+0x3c3/0x690 mm/page-writeback.c:2468 filemap_fdatawrite_wbc+0x11e/0x170 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] filemap_write_and_wait_range+0x1c1/0x2c0 mm/filemap.c:673 __iomap_dio_rw+0xb25/0x20e0 fs/iomap/direct-io.c:573 iomap_dio_rw+0x42/0xa0 fs/iomap/direct-io.c:690 ext4_dio_read_iter fs/ext4/file.c:79 [inline] ext4_file_read_iter+0x595/0x740 fs/ext4/file.c:130 call_read_iter include/linux/fs.h:2186 [inline] generic_file_splice_read+0x24e/0x650 fs/splice.c:309 do_splice_to fs/splice.c:793 [inline] splice_direct_to_actor+0x41b/0xc00 fs/splice.c:865 do_splice_direct+0x2a0/0x3f0 fs/splice.c:974 do_sendfile+0x641/0xfd0 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1317 [inline] __se_sys_sendfile64+0x178/0x1e0 fs/read_write.c:1303 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Chain exists of: &sbi->s_writepages_rwsem --> &journal->j_checkpoint_mutex --> &sb->s_type->i_mutex_key#7 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#7); lock(&journal->j_checkpoint_mutex); lock(&sb->s_type->i_mutex_key#7); lock(&sbi->s_writepages_rwsem); *** DEADLOCK *** 2 locks held by syz-executor.1/6130: #0: ffff88814b25a460 (sb_writers#4){.+.+}-{0:0}, at: do_sendfile+0x61c/0xfd0 fs/read_write.c:1248 #1: ffff88803dd0ca38 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:771 [inline] #1: ffff88803dd0ca38 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_dio_read_iter fs/ext4/file.c:63 [inline] #1: ffff88803dd0ca38 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_file_read_iter+0x26b/0x740 fs/ext4/file.c:130 stack backtrace: CPU: 1 PID: 6130 Comm: syz-executor.1 Not tainted 5.19.0-syzkaller-13930-g7ebfc85e2cd7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2f9/0x3b0 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain+0x1872/0x6600 kernel/locking/lockdep.c:3829 __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5053 lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5666 percpu_down_read+0x44/0x190 include/linux/percpu-rwsem.h:51 ext4_writepages+0x1e7/0x3be0 fs/ext4/inode.c:2687 do_writepages+0x3c3/0x690 mm/page-writeback.c:2468 filemap_fdatawrite_wbc+0x11e/0x170 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] filemap_write_and_wait_range+0x1c1/0x2c0 mm/filemap.c:673 __iomap_dio_rw+0xb25/0x20e0 fs/iomap/direct-io.c:573 iomap_dio_rw+0x42/0xa0 fs/iomap/direct-io.c:690 ext4_dio_read_iter fs/ext4/file.c:79 [inline] ext4_file_read_iter+0x595/0x740 fs/ext4/file.c:130 call_read_iter include/linux/fs.h:2186 [inline] generic_file_splice_read+0x24e/0x650 fs/splice.c:309 do_splice_to fs/splice.c:793 [inline] splice_direct_to_actor+0x41b/0xc00 fs/splice.c:865 do_splice_direct+0x2a0/0x3f0 fs/splice.c:974 do_sendfile+0x641/0xfd0 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1317 [inline] __se_sys_sendfile64+0x178/0x1e0 fs/read_write.c:1303 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fce42889279 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:00007fce4395e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fce4299c1f0 RCX: 00007fce42889279 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000003 RBP: 00007fce428e3189 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000010000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffdba263bf R14: 00007fce4395e300 R15: 0000000000022000