====================================================== WARNING: possible circular locking dependency detected 6.1.0-rc3-syzkaller-00706-gfbeb229a6622 #0 Not tainted ------------------------------------------------------ syz-executor.2/31010 is trying to acquire lock: ffff88814ab8a650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:664 but task is already holding lock: ffff88814ab8cb98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0x22c/0x1c10 fs/ext4/migrate.c:436 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+0x1c4/0x3da0 fs/ext4/inode.c:2694 do_writepages+0x1ab/0x690 mm/page-writeback.c:2469 filemap_fdatawrite_wbc mm/filemap.c:388 [inline] filemap_fdatawrite_wbc+0x143/0x1b0 mm/filemap.c:378 __filemap_fdatawrite_range+0xb4/0xf0 mm/filemap.c:421 filemap_write_and_wait_range+0x85/0x100 mm/filemap.c:674 __iomap_dio_rw+0x5ed/0x1cb0 fs/iomap/direct-io.c:573 iomap_dio_rw+0x3c/0xa0 fs/iomap/direct-io.c:690 ext4_dio_read_iter fs/ext4/file.c:94 [inline] ext4_file_read_iter+0x4ba/0x690 fs/ext4/file.c:145 call_read_iter include/linux/fs.h:2185 [inline] generic_file_splice_read+0x17e/0x4b0 fs/splice.c:309 do_splice_to+0x1b9/0x240 fs/splice.c:793 splice_direct_to_actor+0x2a7/0x8a0 fs/splice.c:865 do_splice_direct+0x1a7/0x270 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+0x1cc/0x210 fs/read_write.c:1309 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 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+0x98/0x450 kernel/locking/rwsem.c:1509 inode_lock_shared include/linux/fs.h:766 [inline] ext4_bmap+0x4e/0x460 fs/ext4/inode.c:3164 bmap+0xaa/0x120 fs/inode.c:1798 jbd2_journal_bmap+0xa8/0x180 fs/jbd2/journal.c:977 __jbd2_journal_erase fs/jbd2/journal.c:1789 [inline] jbd2_journal_flush+0x84f/0xc00 fs/jbd2/journal.c:2492 ext4_ioctl_checkpoint fs/ext4/ioctl.c:1082 [inline] __ext4_ioctl+0x290a/0x4b70 fs/ext4/ioctl.c:1587 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+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 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+0x13f/0x1190 kernel/locking/mutex.c:833 __jbd2_log_wait_for_space+0x234/0x460 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+0x399/0x9b0 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x41d/0x530 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_evict_inode+0x9fa/0x1e30 fs/ext4/inode.c:251 evict+0x2ed/0x6b0 fs/inode.c:664 iput_final fs/inode.c:1747 [inline] iput.part.0+0x59b/0x880 fs/inode.c:1773 iput+0x58/0x70 fs/inode.c:1763 d_delete_notify include/linux/fsnotify.h:261 [inline] vfs_rmdir.part.0+0x496/0x5a0 fs/namei.c:4133 vfs_rmdir fs/namei.c:4105 [inline] do_rmdir+0x3a6/0x430 fs/namei.c:4181 __do_sys_unlinkat fs/namei.c:4361 [inline] __se_sys_unlinkat fs/namei.c:4355 [inline] __x64_sys_unlinkat+0xeb/0x130 fs/namei.c:4355 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 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 kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1df/0x630 kernel/locking/lockdep.c:5633 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1826 [inline] sb_start_intwrite include/linux/fs.h:1948 [inline] ext4_evict_inode+0x12bd/0x1e30 fs/ext4/inode.c:240 evict+0x2ed/0x6b0 fs/inode.c:664 iput_final fs/inode.c:1747 [inline] iput.part.0+0x59b/0x880 fs/inode.c:1773 iput+0x58/0x70 fs/inode.c:1763 ext4_ext_migrate+0xb9d/0x1c10 fs/ext4/migrate.c:586 __ext4_ioctl+0x12a4/0x4b70 fs/ext4/ioctl.c:1389 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+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 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.2/31010: #0: ffff88814ab8a460 (sb_writers#4){.+.+}-{0:0}, at: __ext4_ioctl+0x1273/0x4b70 fs/ext4/ioctl.c:1379 #1: ffff88807382de48 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff88807382de48 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: __ext4_ioctl+0x129c/0x4b70 fs/ext4/ioctl.c:1388 #2: ffff88814ab8cb98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0x22c/0x1c10 fs/ext4/migrate.c:436 stack backtrace: CPU: 0 PID: 31010 Comm: syz-executor.2 Not tainted 6.1.0-rc3-syzkaller-00706-gfbeb229a6622 #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+0xcd/0x134 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 kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1df/0x630 kernel/locking/lockdep.c:5633 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1826 [inline] sb_start_intwrite include/linux/fs.h:1948 [inline] ext4_evict_inode+0x12bd/0x1e30 fs/ext4/inode.c:240 evict+0x2ed/0x6b0 fs/inode.c:664 iput_final fs/inode.c:1747 [inline] iput.part.0+0x59b/0x880 fs/inode.c:1773 iput+0x58/0x70 fs/inode.c:1763 ext4_ext_migrate+0xb9d/0x1c10 fs/ext4/migrate.c:586 __ext4_ioctl+0x12a4/0x4b70 fs/ext4/ioctl.c:1389 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+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f8ff488b639 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:00007f8ff5612168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f8ff49abf80 RCX: 00007f8ff488b639 RDX: 0000000000000000 RSI: 0000000000006609 RDI: 0000000000000005 RBP: 00007f8ff48e67e1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd1ec8e85f R14: 00007f8ff5612300 R15: 0000000000022000