EXT4-fs (loop2): Test dummy encryption mode enabled EXT4-fs (loop2): stripe (9) is not aligned with cluster size (16), stripe is disabled EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ====================================================== WARNING: possible circular locking dependency detected 6.6.101-syzkaller #0 Not tainted ------------------------------------------------------ syz.2.83/6203 is trying to acquire lock: ffff888020f5ea20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:155 but task is already holding lock: ffff88807760ca10 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] ffff88807760ca10 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0x9d/0x350 fs/ext4/file.c:294 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&sb->s_type->i_mutex_key#8){++++}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 inode_lock_shared include/linux/fs.h:814 [inline] ext4_bmap+0x4e/0x260 fs/ext4/inode.c:3139 bmap+0xa6/0xe0 fs/inode.c:1871 jbd2_journal_init_inode+0x87/0x3d0 fs/jbd2/journal.c:1711 ext4_open_inode_journal fs/ext4/super.c:5859 [inline] ext4_load_journal fs/ext4/super.c:6018 [inline] ext4_load_and_init_journal+0x315/0x2100 fs/ext4/super.c:4922 __ext4_fill_super fs/ext4/super.c:5398 [inline] ext4_fill_super+0x415f/0x6620 fs/ext4/super.c:5729 get_tree_bdev+0x3e4/0x510 fs/super.c:1591 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24b/0xa40 fs/namespace.c:3371 init_mount+0xd2/0x120 fs/init.c:25 do_mount_root+0x97/0x230 init/do_mounts.c:166 mount_root_generic+0x195/0x3c0 init/do_mounts.c:205 prepare_namespace+0xc2/0x100 init/do_mounts.c:489 kernel_init_freeable+0x413/0x570 init/main.c:1566 kernel_init+0x1d/0x1c0 init/main.c:1443 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 -> #4 (&type->s_umount_key#32){++++}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 __super_lock fs/super.c:58 [inline] super_lock+0x167/0x360 fs/super.c:117 super_lock_shared fs/super.c:146 [inline] super_lock_shared_active fs/super.c:1442 [inline] fs_bdev_sync+0xa4/0x170 fs/super.c:1477 blkdev_flushbuf block/ioctl.c:375 [inline] blkdev_common_ioctl+0x880/0x23d0 block/ioctl.c:505 blkdev_ioctl+0x4eb/0x6f0 block/ioctl.c:627 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #3 (&bdev->bd_holder_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x129/0xcc0 kernel/locking/mutex.c:747 bd_finish_claiming+0x22f/0x3f0 block/bdev.c:568 blkdev_get_by_dev+0x45c/0x600 block/bdev.c:801 bdev_open_by_dev+0x77/0x100 block/bdev.c:842 setup_bdev_super+0x59/0x660 fs/super.c:1496 mount_bdev+0x1dd/0x2d0 fs/super.c:1640 legacy_get_tree+0xea/0x180 fs/fs_context.c:662 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24b/0xa40 fs/namespace.c:3371 init_mount+0xd2/0x120 fs/init.c:25 do_mount_root+0x97/0x230 init/do_mounts.c:166 mount_root_generic+0x195/0x3c0 init/do_mounts.c:205 prepare_namespace+0xc2/0x100 init/do_mounts.c:489 kernel_init_freeable+0x413/0x570 init/main.c:1566 kernel_init+0x1d/0x1c0 init/main.c:1443 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 -> #2 (bdev_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x129/0xcc0 kernel/locking/mutex.c:747 bd_prepare_to_claim+0x1ba/0x480 block/bdev.c:510 truncate_bdev_range+0x4e/0x260 block/bdev.c:105 blk_ioctl_zeroout block/ioctl.c:188 [inline] blkdev_common_ioctl+0x1b92/0x23d0 block/ioctl.c:513 blkdev_ioctl+0x4eb/0x6f0 block/ioctl.c:627 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (mapping.invalidate_lock#2){++++}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 filemap_invalidate_lock_shared include/linux/fs.h:859 [inline] filemap_fault+0x5db/0x15a0 mm/filemap.c:3330 __do_fault+0x13b/0x4e0 mm/memory.c:4243 do_read_fault mm/memory.c:4616 [inline] do_fault mm/memory.c:4753 [inline] do_pte_missing mm/memory.c:3688 [inline] handle_pte_fault mm/memory.c:5025 [inline] __handle_mm_fault mm/memory.c:5166 [inline] handle_mm_fault+0x3886/0x4920 mm/memory.c:5331 faultin_page mm/gup.c:868 [inline] __get_user_pages+0x5ea/0x1470 mm/gup.c:1167 populate_vma_page_range+0x2b6/0x370 mm/gup.c:1593 __mm_populate+0x24c/0x380 mm/gup.c:1696 mm_populate include/linux/mm.h:3317 [inline] vm_mmap_pgoff+0x2e7/0x400 mm/util.c:561 ksys_mmap_pgoff+0x520/0x700 mm/mmap.c:1427 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&mm->mmap_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 down_read_killable+0x50/0x340 kernel/locking/rwsem.c:1543 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:155 get_mmap_lock_carefully mm/memory.c:5367 [inline] lock_mm_and_find_vma+0x2a3/0x300 mm/memory.c:5418 do_user_addr_fault+0x36c/0x12e0 arch/x86/mm/fault.c:1345 handle_page_fault arch/x86/mm/fault.c:1465 [inline] exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608 fault_in_readable+0xd0/0x160 mm/gup.c:1904 fault_in_iov_iter_readable+0xbf/0x2e0 lib/iov_iter.c:216 generic_perform_write+0x1f2/0x5b0 mm/filemap.c:4006 ext4_buffered_write_iter+0xcc/0x350 fs/ext4/file.c:299 ext4_file_write_iter+0x1d9/0x1870 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2018 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x43b/0x940 fs/read_write.c:584 ksys_write+0x147/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: &mm->mmap_lock --> &type->s_umount_key#32 --> &sb->s_type->i_mutex_key#8 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#8); lock(&type->s_umount_key#32); lock(&sb->s_type->i_mutex_key#8); rlock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz.2.83/6203: #0: ffff888023dead48 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2a3/0x330 fs/file.c:1042 #1: ffff88807df6a418 (sb_writers#4){.+.+}-{0:0}, at: vfs_write+0x20e/0x940 fs/read_write.c:580 #2: ffff88807760ca10 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #2: ffff88807760ca10 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0x9d/0x350 fs/ext4/file.c:294 stack backtrace: CPU: 0 PID: 6203 Comm: syz.2.83 Not tainted 6.6.101-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 down_read_killable+0x50/0x340 kernel/locking/rwsem.c:1543 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:155 get_mmap_lock_carefully mm/memory.c:5367 [inline] lock_mm_and_find_vma+0x2a3/0x300 mm/memory.c:5418 do_user_addr_fault+0x36c/0x12e0 arch/x86/mm/fault.c:1345 handle_page_fault arch/x86/mm/fault.c:1465 [inline] exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608 RIP: 0010:fault_in_readable+0xd0/0x160 mm/gup.c:1905 Code: c6 b4 bf ff 4d 89 f4 49 81 cc ff 0f 00 00 4d 89 f7 49 01 dc 49 81 e4 00 f0 ff ff 4d 39 e6 77 44 e8 a5 b4 bf ff 4d 39 e7 74 47 <41> 8a 07 88 44 24 07 49 81 c7 00 10 00 00 4d 39 e7 74 07 e8 88 b4 RSP: 0018:ffffc9000bed7950 EFLAGS: 00050287 RAX: ffffffff81c5e0eb RBX: 0000000000001000 RCX: 0000000000080000 RDX: ffffc9000d1d9000 RSI: 00000000000610fd RDI: 00000000000610fe RBP: dffffc0000000000 R08: ffff888022a2bc00 R09: 0000000000000002 R10: 0000000000000005 R11: 0000000000000002 R12: 000020000002f000 R13: 0000000000000000 R14: 000020000002d040 R15: 000020000002e000 fault_in_iov_iter_readable+0xbf/0x2e0 lib/iov_iter.c:216 generic_perform_write+0x1f2/0x5b0 mm/filemap.c:4006 ext4_buffered_write_iter+0xcc/0x350 fs/ext4/file.c:299 ext4_file_write_iter+0x1d9/0x1870 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2018 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x43b/0x940 fs/read_write.c:584 ksys_write+0x147/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f5c27b8eb69 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5c28951038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f5c27db5fa0 RCX: 00007f5c27b8eb69 RDX: 000000000208e24b RSI: 0000200000000040 RDI: 0000000000000004 RBP: 00007f5c27c11df1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5c27db5fa0 R15: 00007fff11f2b0c8 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: b4 bf mov $0xbf,%ah 2: ff 4d 89 decl -0x77(%rbp) 5: f4 hlt 6: 49 81 cc ff 0f 00 00 or $0xfff,%r12 d: 4d 89 f7 mov %r14,%r15 10: 49 01 dc add %rbx,%r12 13: 49 81 e4 00 f0 ff ff and $0xfffffffffffff000,%r12 1a: 4d 39 e6 cmp %r12,%r14 1d: 77 44 ja 0x63 1f: e8 a5 b4 bf ff call 0xffbfb4c9 24: 4d 39 e7 cmp %r12,%r15 27: 74 47 je 0x70 * 29: 41 8a 07 mov (%r15),%al <-- trapping instruction 2c: 88 44 24 07 mov %al,0x7(%rsp) 30: 49 81 c7 00 10 00 00 add $0x1000,%r15 37: 4d 39 e7 cmp %r12,%r15 3a: 74 07 je 0x43 3c: e8 .byte 0xe8 3d: 88 .byte 0x88 3e: b4 .byte 0xb4