EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: writeback. ext4 filesystem being mounted at /root/syzkaller-testdir1575346337/syzkaller.YABvl6/522/file0 supports timestamps until 2038 (0x7fffffff) ====================================================== WARNING: possible circular locking dependency detected 6.1.0-next-20221220-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/23177 is trying to acquire lock: ffff88807d490650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:664 but task is already holding lock: ffff88807d494b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0x326/0x1ce0 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}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] ext4_writepages+0x1a9/0x5a0 fs/ext4/inode.c:2964 do_writepages+0x1af/0x690 mm/page-writeback.c:2581 filemap_fdatawrite_wbc mm/filemap.c:388 [inline] filemap_fdatawrite_wbc+0x147/0x1b0 mm/filemap.c:378 __filemap_fdatawrite_range+0xb8/0xf0 mm/filemap.c:421 filemap_write_and_wait_range mm/filemap.c:674 [inline] filemap_write_and_wait_range+0xa1/0x120 mm/filemap.c:665 __iomap_dio_rw+0x5ea/0x1cd0 fs/iomap/direct-io.c:572 iomap_dio_rw+0x40/0xa0 fs/iomap/direct-io.c:689 ext4_dio_read_iter fs/ext4/file.c:94 [inline] ext4_file_read_iter+0x4be/0x690 fs/ext4/file.c:145 call_read_iter include/linux/fs.h:2180 [inline] generic_file_splice_read+0x182/0x4b0 fs/splice.c:309 do_splice_to+0x1b9/0x240 fs/splice.c:793 splice_direct_to_actor+0x2ab/0x8a0 fs/splice.c:865 do_splice_direct+0x1ab/0x280 fs/splice.c:974 do_sendfile+0xb19/0x1270 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64 fs/read_write.c:1309 [inline] __x64_sys_sendfile64+0x259/0x2c0 fs/read_write.c:1309 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #2 (&sb->s_type->i_mutex_key#8){++++}-{3:3}: down_read+0x9c/0x450 kernel/locking/rwsem.c:1509 inode_lock_shared include/linux/fs.h:766 [inline] ext4_bmap+0x52/0x470 fs/ext4/inode.c:3243 bmap+0xae/0x120 fs/inode.c:1798 jbd2_journal_bmap+0xac/0x180 fs/jbd2/journal.c:977 __jbd2_journal_erase fs/jbd2/journal.c:1789 [inline] jbd2_journal_flush+0x853/0xc00 fs/jbd2/journal.c:2492 ext4_ioctl_checkpoint fs/ext4/ioctl.c:1082 [inline] __ext4_ioctl+0xb0d/0x4f60 fs/ext4/ioctl.c:1590 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (&journal->j_checkpoint_mutex){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] mutex_lock_io_nested+0x143/0x11a0 kernel/locking/mutex.c:833 __jbd2_log_wait_for_space+0x238/0x460 fs/jbd2/checkpoint.c:110 add_transaction_credits+0xa2d/0xb70 fs/jbd2/transaction.c:298 start_this_handle+0x3ae/0x14a0 fs/jbd2/transaction.c:422 jbd2__journal_start+0x38a/0x6b0 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x6e9/0x860 fs/ext4/ext4_jbd2.c:111 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_evict_inode+0xa25/0x1ba0 fs/ext4/inode.c:251 evict+0x2ed/0x6b0 fs/inode.c:664 iput_final fs/inode.c:1747 [inline] iput fs/inode.c:1773 [inline] iput+0x52b/0x8c0 fs/inode.c:1759 do_unlinkat+0x406/0x640 fs/namei.c:4327 __do_sys_unlink fs/namei.c:4368 [inline] __se_sys_unlink fs/namei.c:4366 [inline] __x64_sys_unlink+0xca/0x110 fs/namei.c:4366 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 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 kernel/locking/lockdep.c:3831 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055 lock_acquire.part.0+0x11a/0x350 kernel/locking/lockdep.c:5668 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1811 [inline] sb_start_intwrite include/linux/fs.h:1933 [inline] ext4_evict_inode+0x10dc/0x1ba0 fs/ext4/inode.c:240 evict+0x2ed/0x6b0 fs/inode.c:664 iput_final fs/inode.c:1747 [inline] iput fs/inode.c:1773 [inline] iput+0x52b/0x8c0 fs/inode.c:1759 ext4_ext_migrate+0xc99/0x1ce0 fs/ext4/migrate.c:587 ext4_ioctl_setflags fs/ext4/ioctl.c:694 [inline] ext4_fileattr_set+0xed2/0x1a50 fs/ext4/ioctl.c:1004 vfs_fileattr_set+0x7f9/0xbe0 fs/ioctl.c:696 ioctl_setflags fs/ioctl.c:728 [inline] do_vfs_ioctl+0xa5a/0x1ae0 fs/ioctl.c:839 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x10c/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 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.2/23177: #0: ffff88807d490460 (sb_writers#4){.+.+}-{0:0}, at: ioctl_setflags fs/ioctl.c:725 [inline] #0: ffff88807d490460 (sb_writers#4){.+.+}-{0:0}, at: do_vfs_ioctl+0xa1d/0x1ae0 fs/ioctl.c:839 #1: ffff888042105e48 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff888042105e48 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: vfs_fileattr_set+0x14c/0xbe0 fs/ioctl.c:681 #2: ffff88807d494b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0x326/0x1ce0 fs/ext4/migrate.c:437 stack backtrace: CPU: 0 PID: 23177 Comm: syz-executor.2 Not tainted 6.1.0-next-20221220-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 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 kernel/locking/lockdep.c:3831 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055 lock_acquire.part.0+0x11a/0x350 kernel/locking/lockdep.c:5668 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1811 [inline] sb_start_intwrite include/linux/fs.h:1933 [inline] ext4_evict_inode+0x10dc/0x1ba0 fs/ext4/inode.c:240 evict+0x2ed/0x6b0 fs/inode.c:664 iput_final fs/inode.c:1747 [inline] iput fs/inode.c:1773 [inline] iput+0x52b/0x8c0 fs/inode.c:1759 ext4_ext_migrate+0xc99/0x1ce0 fs/ext4/migrate.c:587 ext4_ioctl_setflags fs/ext4/ioctl.c:694 [inline] ext4_fileattr_set+0xed2/0x1a50 fs/ext4/ioctl.c:1004 vfs_fileattr_set+0x7f9/0xbe0 fs/ioctl.c:696 ioctl_setflags fs/ioctl.c:728 [inline] do_vfs_ioctl+0xa5a/0x1ae0 fs/ioctl.c:839 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x10c/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fd634e8c0a9 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:00007fd635b12168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fd634fabf80 RCX: 00007fd634e8c0a9 RDX: 0000000020000200 RSI: 0000000040086602 RDI: 0000000000000004 RBP: 00007fd634ee7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe4624b59f R14: 00007fd635b12300 R15: 0000000000022000