====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc4-syzkaller-g66d2d510fea3 #0 Not tainted ------------------------------------------------------ syz.1.271/7722 is trying to acquire lock: ffff0000e1204610 (sb_internal#5){.+.+}-{0:0}, at: nilfs_page_mkwrite+0x8d0/0xca8 fs/nilfs2/file.c:95 but task is already holding lock: ffff0000e1204518 (sb_pagefaults#4){.+.+}-{0:0}, at: do_page_mkwrite+0x138/0x2b8 mm/memory.c:3287 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #6 (sb_pagefaults#4){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:52 [inline] __sb_start_write include/linux/fs.h:1783 [inline] sb_start_pagefault include/linux/fs.h:1948 [inline] nilfs_page_mkwrite+0x1ec/0xca8 fs/nilfs2/file.c:57 do_page_mkwrite+0x138/0x2b8 mm/memory.c:3287 wp_page_shared mm/memory.c:3688 [inline] do_wp_page+0x1b54/0x43a8 mm/memory.c:3907 handle_pte_fault mm/memory.c:6013 [inline] __handle_mm_fault mm/memory.c:6140 [inline] handle_mm_fault+0x1064/0x4cec mm/memory.c:6309 do_page_fault+0x428/0x1554 arch/arm64/mm/fault.c:647 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:919 el0_da+0x64/0x160 arch/arm64/kernel/entry-common.c:604 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #5 (vm_lock){++++}-{0:0}: __vma_enter_locked+0x184/0x354 mm/memory.c:6473 __vma_start_write+0x34/0x158 mm/memory.c:6497 vma_start_write include/linux/mm.h:829 [inline] vma_expand+0x1b8/0x8f0 mm/vma.c:1086 relocate_vma_down+0x234/0x400 mm/mmap.c:1767 setup_arg_pages+0x4b4/0x920 fs/exec.c:800 load_elf_binary+0x8c4/0x1ebc fs/binfmt_elf.c:1019 search_binary_handler fs/exec.c:1778 [inline] exec_binprm fs/exec.c:1810 [inline] bprm_execve+0x77c/0x10dc fs/exec.c:1862 kernel_execve+0x70c/0x7f4 fs/exec.c:2028 run_init_process+0x1bc/0x1ec init/main.c:1378 try_to_run_init_process+0x20/0x7c init/main.c:1385 kernel_init+0xa8/0x1dc init/main.c:1513 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 -> #4 (&mm->mmap_lock){++++}-{4:4}: __might_fault+0xc4/0x124 mm/memory.c:7151 _copy_to_iter+0xe0/0x1394 lib/iov_iter.c:184 copy_page_to_iter+0x24c/0x348 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:198 [inline] filemap_read+0x668/0xf4c mm/filemap.c:2753 blkdev_read_iter+0x2b0/0x3dc block/fops.c:809 new_sync_read fs/read_write.c:489 [inline] vfs_read+0x5fc/0x898 fs/read_write.c:570 ksys_read+0x120/0x210 fs/read_write.c:713 __do_sys_read fs/read_write.c:722 [inline] __se_sys_read fs/read_write.c:720 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:720 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #3 (&sb->s_type->i_mutex_key#8){++++}-{4:4}: down_write+0x50/0xc0 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:867 [inline] set_blocksize+0x1c4/0x440 block/bdev.c:203 sb_set_blocksize block/bdev.c:224 [inline] sb_min_blocksize+0x118/0x1fc block/bdev.c:239 init_nilfs+0x4c/0x584 fs/nilfs2/the_nilfs.c:710 nilfs_fill_super+0x94/0x568 fs/nilfs2/super.c:1060 nilfs_get_tree+0x378/0x664 fs/nilfs2/super.c:1228 vfs_get_tree+0x90/0x28c fs/super.c:1759 do_new_mount+0x228/0x814 fs/namespace.c:3884 path_mount+0x5b4/0xde0 fs/namespace.c:4211 do_mount fs/namespace.c:4224 [inline] __do_sys_mount fs/namespace.c:4435 [inline] __se_sys_mount fs/namespace.c:4412 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4412 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #2 (&nilfs->ns_sem){++++}-{4:4}: down_write+0x50/0xc0 kernel/locking/rwsem.c:1577 nilfs_set_error fs/nilfs2/super.c:92 [inline] __nilfs_error+0x164/0x3bc fs/nilfs2/super.c:141 nilfs_bmap_convert_error fs/nilfs2/bmap.c:35 [inline] nilfs_bmap_propagate+0x100/0x124 fs/nilfs2/bmap.c:332 nilfs_collect_file_data+0x54/0xe8 fs/nilfs2/segment.c:589 nilfs_segctor_apply_buffers+0x170/0x31c fs/nilfs2/segment.c:1010 nilfs_segctor_scan_file+0x5a4/0xc1c fs/nilfs2/segment.c:1059 nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1254 [inline] nilfs_segctor_collect fs/nilfs2/segment.c:1547 [inline] nilfs_segctor_do_construct+0x1774/0x6398 fs/nilfs2/segment.c:2122 nilfs_segctor_construct+0x134/0x540 fs/nilfs2/segment.c:2478 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2586 [inline] nilfs_segctor_thread+0x444/0xac8 fs/nilfs2/segment.c:2700 kthread+0x5fc/0x75c kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 -> #1 (&nilfs->ns_segctor_sem){++++}-{4:4}: down_read+0x58/0x2f8 kernel/locking/rwsem.c:1524 nilfs_transaction_begin+0x35c/0x6f8 fs/nilfs2/segment.c:221 nilfs_dirty_inode+0x134/0x200 fs/nilfs2/inode.c:1088 __mark_inode_dirty+0x2ac/0x10dc fs/fs-writeback.c:2527 generic_update_time fs/inode.c:2064 [inline] inode_update_time fs/inode.c:2077 [inline] __file_update_time fs/inode.c:2305 [inline] file_update_time+0x34c/0x3c0 fs/inode.c:2335 __generic_file_write_iter+0xa8/0x204 mm/filemap.c:4201 generic_file_write_iter+0x104/0x470 mm/filemap.c:4246 new_sync_write fs/read_write.c:591 [inline] vfs_write+0x62c/0x97c fs/read_write.c:684 ksys_write+0x120/0x210 fs/read_write.c:736 __do_sys_write fs/read_write.c:747 [inline] __se_sys_write fs/read_write.c:744 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:744 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #0 (sb_internal#5){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1728/0x3058 kernel/locking/lockdep.c:5235 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5866 percpu_down_read include/linux/percpu-rwsem.h:52 [inline] __sb_start_write include/linux/fs.h:1783 [inline] sb_start_intwrite include/linux/fs.h:1966 [inline] nilfs_transaction_begin+0x1f4/0x6f8 fs/nilfs2/segment.c:218 nilfs_page_mkwrite+0x8d0/0xca8 fs/nilfs2/file.c:95 do_page_mkwrite+0x138/0x2b8 mm/memory.c:3287 wp_page_shared mm/memory.c:3688 [inline] do_wp_page+0x1b54/0x43a8 mm/memory.c:3907 handle_pte_fault mm/memory.c:6013 [inline] __handle_mm_fault mm/memory.c:6140 [inline] handle_mm_fault+0x1064/0x4cec mm/memory.c:6309 do_page_fault+0x428/0x1554 arch/arm64/mm/fault.c:647 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:919 el0_da+0x64/0x160 arch/arm64/kernel/entry-common.c:604 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 other info that might help us debug this: Chain exists of: sb_internal#5 --> vm_lock --> sb_pagefaults#4 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_pagefaults#4); lock(vm_lock); lock(sb_pagefaults#4); rlock(sb_internal#5); *** DEADLOCK *** 2 locks held by syz.1.271/7722: #0: ffff0000eec44588 (vm_lock){++++}-{0:0}, at: do_page_fault+0x3c4/0x1554 arch/arm64/mm/fault.c:619 #1: ffff0000e1204518 (sb_pagefaults#4){.+.+}-{0:0}, at: do_page_mkwrite+0x138/0x2b8 mm/memory.c:3287 stack backtrace: CPU: 1 UID: 0 PID: 7722 Comm: syz.1.271 Not tainted 6.15.0-rc4-syzkaller-g66d2d510fea3 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2079 check_noncircular+0x154/0x174 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1728/0x3058 kernel/locking/lockdep.c:5235 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5866 percpu_down_read include/linux/percpu-rwsem.h:52 [inline] __sb_start_write include/linux/fs.h:1783 [inline] sb_start_intwrite include/linux/fs.h:1966 [inline] nilfs_transaction_begin+0x1f4/0x6f8 fs/nilfs2/segment.c:218 nilfs_page_mkwrite+0x8d0/0xca8 fs/nilfs2/file.c:95 do_page_mkwrite+0x138/0x2b8 mm/memory.c:3287 wp_page_shared mm/memory.c:3688 [inline] do_wp_page+0x1b54/0x43a8 mm/memory.c:3907 handle_pte_fault mm/memory.c:6013 [inline] __handle_mm_fault mm/memory.c:6140 [inline] handle_mm_fault+0x1064/0x4cec mm/memory.c:6309 do_page_fault+0x428/0x1554 arch/arm64/mm/fault.c:647 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:919 el0_da+0x64/0x160 arch/arm64/kernel/entry-common.c:604 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600