EXT4-fs (loop3): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: writeback. ext4 filesystem being mounted at /root/syzkaller-testdir3538147115/syzkaller.cfcVIy/449/file0 supports timestamps until 2038 (0x7fffffff) ====================================================== WARNING: possible circular locking dependency detected 6.2.0-rc6-syzkaller-00083-ge7368fd30165 #0 Not tainted ------------------------------------------------------ syz-executor.3/22408 is trying to acquire lock: ffff888029c36650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1814 [inline] ffff888029c36650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1936 [inline] ffff888029c36650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x4cd/0x10b0 fs/ext4/inode.c:240 but task is already holding lock: ffff888029c34b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0x2e9/0x1320 fs/ext4/migrate.c:437 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&sbi->s_writepages_rwsem){++++}-{0:0}: lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 percpu_down_read+0x44/0x190 include/linux/percpu-rwsem.h:51 ext4_writepages+0x1d8/0x290 fs/ext4/inode.c:2964 do_writepages+0x3c3/0x680 mm/page-writeback.c:2581 filemap_fdatawrite_wbc+0x11e/0x170 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] filemap_write_and_wait_range+0x1df/0x2e0 mm/filemap.c:674 __iomap_dio_rw+0xaf5/0x20c0 fs/iomap/direct-io.c:572 iomap_dio_rw+0x42/0xa0 fs/iomap/direct-io.c:689 ext4_dio_write_iter fs/ext4/file.c:587 [inline] ext4_file_write_iter+0x153b/0x18f0 fs/ext4/file.c:698 do_iter_write+0x6c2/0xc20 fs/read_write.c:861 iter_file_splice_write+0x7fc/0xfc0 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+0x279/0x3d0 fs/splice.c:974 do_sendfile+0x5fb/0xf80 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64+0x14f/0x1b0 fs/read_write.c:1309 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #2 (&sb->s_type->i_mutex_key#8){++++}-{3:3}: lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 down_read+0x39/0x50 kernel/locking/rwsem.c:1509 inode_lock_shared include/linux/fs.h:766 [inline] ext4_bmap+0x55/0x410 fs/ext4/inode.c:3243 bmap+0xa1/0xd0 fs/inode.c:1798 jbd2_journal_bmap fs/jbd2/journal.c:977 [inline] __jbd2_journal_erase fs/jbd2/journal.c:1789 [inline] jbd2_journal_flush+0x5d0/0xca0 fs/jbd2/journal.c:2492 ext4_ioctl_checkpoint fs/ext4/ioctl.c:1082 [inline] __ext4_ioctl fs/ext4/ioctl.c:1590 [inline] ext4_ioctl+0x3224/0x54f0 fs/ext4/ioctl.c:1610 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+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (&journal->j_checkpoint_mutex){+.+.}-{3:3}: lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 __mutex_lock_common+0x1bd/0x26e0 kernel/locking/mutex.c:603 mutex_lock_io_nested+0x43/0x60 kernel/locking/mutex.c:833 __jbd2_log_wait_for_space+0x21d/0x6f0 fs/jbd2/checkpoint.c:110 add_transaction_credits+0x916/0xbd0 fs/jbd2/transaction.c:298 start_this_handle+0x744/0x1670 fs/jbd2/transaction.c:422 jbd2__journal_start+0x2ca/0x5b0 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x13b/0x1f0 fs/ext4/ext4_jbd2.c:111 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_evict_inode+0x978/0x10b0 fs/ext4/inode.c:251 evict+0x2a4/0x620 fs/inode.c:664 do_unlinkat+0x4e2/0x930 fs/namei.c:4327 __do_sys_unlink fs/namei.c:4368 [inline] __se_sys_unlink fs/namei.c:4366 [inline] __x64_sys_unlink+0x45/0x50 fs/namei.c:4366 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (sb_internal){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain+0x1898/0x6ae0 kernel/locking/lockdep.c:3831 __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055 lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 percpu_down_read+0x44/0x190 include/linux/percpu-rwsem.h:51 __sb_start_write include/linux/fs.h:1814 [inline] sb_start_intwrite include/linux/fs.h:1936 [inline] ext4_evict_inode+0x4cd/0x10b0 fs/ext4/inode.c:240 evict+0x2a4/0x620 fs/inode.c:664 ext4_ext_migrate+0x101b/0x1320 fs/ext4/migrate.c:587 __ext4_ioctl fs/ext4/ioctl.c:1392 [inline] ext4_ioctl+0x1b6b/0x54f0 fs/ext4/ioctl.c:1610 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+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Chain exists of: sb_internal --> &sb->s_type->i_mutex_key#8 --> &sbi->s_writepages_rwsem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->s_writepages_rwsem); lock(&sb->s_type->i_mutex_key#8); lock(&sbi->s_writepages_rwsem); lock(sb_internal); *** DEADLOCK *** 3 locks held by syz-executor.3/22408: #0: ffff888029c36460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write_file+0x5a/0x1f0 fs/namespace.c:552 #1: ffff88807aecd440 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff88807aecd440 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: __ext4_ioctl fs/ext4/ioctl.c:1391 [inline] #1: ffff88807aecd440 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_ioctl+0x1b63/0x54f0 fs/ext4/ioctl.c:1610 #2: ffff888029c34b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0x2e9/0x1320 fs/ext4/migrate.c:437 stack backtrace: CPU: 1 PID: 22408 Comm: syz-executor.3 Not tainted 6.2.0-rc6-syzkaller-00083-ge7368fd30165 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x290 lib/dump_stack.c:106 check_noncircular+0x2cc/0x390 kernel/locking/lockdep.c:2177 check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain+0x1898/0x6ae0 kernel/locking/lockdep.c:3831 __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055 lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 percpu_down_read+0x44/0x190 include/linux/percpu-rwsem.h:51 __sb_start_write include/linux/fs.h:1814 [inline] sb_start_intwrite include/linux/fs.h:1936 [inline] ext4_evict_inode+0x4cd/0x10b0 fs/ext4/inode.c:240 evict+0x2a4/0x620 fs/inode.c:664 ext4_ext_migrate+0x101b/0x1320 fs/ext4/migrate.c:587 __ext4_ioctl fs/ext4/ioctl.c:1392 [inline] ext4_ioctl+0x1b6b/0x54f0 fs/ext4/ioctl.c:1610 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+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f9309a8c0c9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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:00007f930a74a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f9309babf80 RCX: 00007f9309a8c0c9 RDX: 0000000000000000 RSI: 0000000000006609 RDI: 0000000000000005 RBP: 00007f9309ae7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe7e1cc08f R14: 00007f930a74a300 R15: 0000000000022000