EXT4-fs (loop4): mounted filesystem without journal. Quota mode: writeback. ext4 filesystem being mounted at /root/syzkaller-testdir2273581239/syzkaller.yYAEnL/1740/file1 supports timestamps until 2038 (0x7fffffff) ====================================================== WARNING: possible circular locking dependency detected 6.1.65-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/30736 is trying to acquire lock: ffff88801ea8e650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1875 [inline] ffff88801ea8e650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1997 [inline] ffff88801ea8e650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x46d/0x1150 fs/ext4/inode.c:240 but task is already holding lock: ffff88801ea88b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0x314/0x12f0 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+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51 ext4_writepages+0x1e5/0x3de0 fs/ext4/inode.c:2703 do_writepages+0x3a2/0x670 mm/page-writeback.c:2469 filemap_fdatawrite_wbc+0x121/0x180 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] filemap_write_and_wait_range+0x1a4/0x290 mm/filemap.c:674 __iomap_dio_rw+0xb56/0x2140 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:94 [inline] ext4_file_read_iter+0x50b/0x660 fs/ext4/file.c:145 call_read_iter include/linux/fs.h:2242 [inline] generic_file_splice_read+0x23c/0x630 fs/splice.c:309 do_splice_to fs/splice.c:793 [inline] splice_direct_to_actor+0x408/0xbd0 fs/splice.c:865 do_splice_direct+0x27f/0x3c0 fs/splice.c:974 do_sendfile+0x61c/0xff0 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64+0x178/0x1e0 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+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 down_read+0xad/0xa30 kernel/locking/rwsem.c:1520 inode_lock_shared include/linux/fs.h:766 [inline] ext4_bmap+0x4b/0x410 fs/ext4/inode.c:3176 bmap+0xa1/0xd0 fs/inode.c:1840 jbd2_journal_bmap fs/jbd2/journal.c:977 [inline] __jbd2_journal_erase fs/jbd2/journal.c:1789 [inline] jbd2_journal_flush+0x5b5/0xc40 fs/jbd2/journal.c:2492 ext4_ioctl_checkpoint fs/ext4/ioctl.c:1086 [inline] __ext4_ioctl fs/ext4/ioctl.c:1594 [inline] ext4_ioctl+0x3986/0x5f60 fs/ext4/ioctl.c:1614 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xf1/0x160 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+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] mutex_lock_io_nested+0x134/0xab0 kernel/locking/mutex.c:833 __jbd2_log_wait_for_space+0x213/0x760 fs/jbd2/checkpoint.c:71 add_transaction_credits fs/jbd2/transaction.c:298 [inline] start_this_handle+0x1040/0x21b0 fs/jbd2/transaction.c:422 jbd2__journal_start+0x2d1/0x5c0 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x19b/0x410 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_evict_inode+0x8dc/0x1150 fs/ext4/inode.c:251 evict+0x2a4/0x620 fs/inode.c:664 do_unlinkat+0x503/0x820 fs/namei.c:4328 __do_sys_unlink fs/namei.c:4369 [inline] __se_sys_unlink fs/namei.c:4367 [inline] __x64_sys_unlink+0x45/0x50 fs/namei.c:4367 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:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51 __sb_start_write include/linux/fs.h:1875 [inline] sb_start_intwrite include/linux/fs.h:1997 [inline] ext4_evict_inode+0x46d/0x1150 fs/ext4/inode.c:240 evict+0x2a4/0x620 fs/inode.c:664 ext4_ext_migrate+0x100b/0x12f0 fs/ext4/migrate.c:587 __ext4_ioctl fs/ext4/ioctl.c:1396 [inline] ext4_ioctl+0x1dc6/0x5f60 fs/ext4/ioctl.c:1614 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xf1/0x160 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.4/30736: #0: ffff88801ea8e460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write_file+0x5a/0x1f0 fs/namespace.c:437 #1: ffff88808e644030 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff88808e644030 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: __ext4_ioctl fs/ext4/ioctl.c:1395 [inline] #1: ffff88808e644030 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_ioctl+0x1dbe/0x5f60 fs/ext4/ioctl.c:1614 #2: ffff88801ea88b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0x314/0x12f0 fs/ext4/migrate.c:437 stack backtrace: CPU: 0 PID: 30736 Comm: syz-executor.4 Not tainted 6.1.65-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51 __sb_start_write include/linux/fs.h:1875 [inline] sb_start_intwrite include/linux/fs.h:1997 [inline] ext4_evict_inode+0x46d/0x1150 fs/ext4/inode.c:240 evict+0x2a4/0x620 fs/inode.c:664 ext4_ext_migrate+0x100b/0x12f0 fs/ext4/migrate.c:587 __ext4_ioctl fs/ext4/ioctl.c:1396 [inline] ext4_ioctl+0x1dc6/0x5f60 fs/ext4/ioctl.c:1614 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xf1/0x160 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: 0033:0x7f69e4e7cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f69e5c070c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f69e4f9bf80 RCX: 00007f69e4e7cae9 RDX: 0000000000000000 RSI: 0000000000006609 RDI: 0000000000000005 RBP: 00007f69e4ec847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f69e4f9bf80 R15: 00007fffb91bca98