NILFS error (device loop1): nilfs_bmap_lookup_contig: broken bmap (inode number=16) ====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc4-syzkaller-g66d2d510fea3 #0 Not tainted ------------------------------------------------------ syz.1.511/9103 is trying to acquire lock: ffff0000d4ddc090 (&nilfs->ns_sem){++++}-{4:4}, at: nilfs_set_error fs/nilfs2/super.c:92 [inline] ffff0000d4ddc090 (&nilfs->ns_sem){++++}-{4:4}, at: __nilfs_error+0x164/0x3bc fs/nilfs2/super.c:141 but task is already holding lock: ffff0000cb309470 (&dat_lock_key){.+.+}-{4:4}, at: nilfs_get_block+0x170/0x7a8 fs/nilfs2/inode.c:83 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&dat_lock_key){.+.+}-{4:4}: down_read+0x58/0x2f8 kernel/locking/rwsem.c:1524 nilfs_get_block+0x170/0x7a8 fs/nilfs2/inode.c:83 do_mpage_readpage+0x618/0x16f8 fs/mpage.c:222 mpage_readahead+0x2c8/0x530 fs/mpage.c:371 nilfs_readahead+0x28/0x38 fs/nilfs2/inode.c:156 read_pages+0x13c/0x4c8 mm/readahead.c:160 page_cache_ra_unbounded+0x628/0x71c mm/readahead.c:297 do_page_cache_ra mm/readahead.c:327 [inline] page_cache_ra_order+0x938/0xb34 mm/readahead.c:532 page_cache_sync_ra+0x570/0x714 mm/readahead.c:621 filemap_get_pages+0x2f4/0x19d0 mm/filemap.c:2591 filemap_splice_read+0x400/0xa40 mm/filemap.c:2981 do_splice_read fs/splice.c:979 [inline] splice_direct_to_actor+0x364/0x994 fs/splice.c:1083 do_splice_direct_actor fs/splice.c:1201 [inline] do_splice_direct+0x130/0x210 fs/splice.c:1227 ovl_copy_up_file+0x41c/0x57c fs/overlayfs/copy_up.c:349 ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:885 [inline] ovl_do_copy_up fs/overlayfs/copy_up.c:999 [inline] ovl_copy_up_one fs/overlayfs/copy_up.c:1202 [inline] ovl_copy_up_flags+0x11bc/0x284c fs/overlayfs/copy_up.c:1257 ovl_maybe_copy_up+0x108/0x148 fs/overlayfs/copy_up.c:1287 ovl_open+0x128/0x2b4 fs/overlayfs/file.c:211 do_dentry_open+0xb7c/0x1544 fs/open.c:956 vfs_open+0x44/0x2d4 fs/open.c:1086 do_open fs/namei.c:3880 [inline] path_openat+0x2424/0x2c40 fs/namei.c:4039 do_filp_open+0x18c/0x36c fs/namei.c:4066 do_sys_openat2+0x11c/0x1b4 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1455 __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 (mapping.invalidate_lock#5){.+.+}-{4:4}: down_read+0x58/0x2f8 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:922 [inline] filemap_fault+0x564/0x1278 mm/filemap.c:3391 __do_fault+0xf8/0x498 mm/memory.c:5098 do_read_fault mm/memory.c:5518 [inline] do_fault mm/memory.c:5652 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault mm/memory.c:6140 [inline] handle_mm_fault+0x2c00/0x4cec mm/memory.c:6309 do_page_fault+0x598/0x1554 arch/arm64/mm/fault.c:690 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:783 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:919 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:432 el1h_64_sync_handler+0x50/0xcc arch/arm64/kernel/entry-common.c:510 el1h_64_sync+0x6c/0x70 arch/arm64/kernel/entry.S:595 __uaccess_mask_ptr arch/arm64/include/asm/uaccess.h:169 [inline] ctrl_cdev_ioctl+0x228/0x518 drivers/mtd/ubi/cdev.c:1132 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:892 __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 (&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 -> #1 (&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 -> #0 (&nilfs->ns_sem){++++}-{4:4}: 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 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_lookup_contig+0x114/0x13c fs/nilfs2/bmap.c:100 nilfs_get_block+0x1a0/0x7a8 fs/nilfs2/inode.c:84 block_truncate_page+0x2f4/0x6b8 fs/buffer.c:2702 nilfs_truncate+0x1ec/0x400 fs/nilfs2/inode.c:804 nilfs_setattr+0x1c8/0x26c fs/nilfs2/inode.c:920 notify_change+0x9a4/0xc50 fs/attr.c:552 do_truncate+0x178/0x1f0 fs/open.c:65 vfs_truncate+0x398/0x444 fs/open.c:115 do_sys_truncate+0xe4/0x1a8 fs/open.c:138 __do_sys_truncate fs/open.c:150 [inline] __se_sys_truncate fs/open.c:148 [inline] __arm64_sys_truncate+0x5c/0x74 fs/open.c:148 __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 other info that might help us debug this: Chain exists of: &nilfs->ns_sem --> mapping.invalidate_lock#5 --> &dat_lock_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&dat_lock_key); lock(mapping.invalidate_lock#5); lock(&dat_lock_key); lock(&nilfs->ns_sem); *** DEADLOCK *** 5 locks held by syz.1.511/9103: #0: ffff0000da6d8420 (sb_writers#19){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:556 #1: ffff0000f32f95c0 (&sb->s_type->i_mutex_key#27){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff0000f32f95c0 (&sb->s_type->i_mutex_key#27){+.+.}-{4:4}, at: do_truncate+0x164/0x1f0 fs/open.c:63 #2: ffff0000da6d8610 (sb_internal#4){.+.+}-{0:0}, at: nilfs_setattr+0x110/0x26c fs/nilfs2/inode.c:912 #3: ffff0000d4ddc2a0 (&nilfs->ns_segctor_sem){++++}-{4:4}, at: nilfs_transaction_begin+0x35c/0x6f8 fs/nilfs2/segment.c:221 #4: ffff0000cb309470 (&dat_lock_key){.+.+}-{4:4}, at: nilfs_get_block+0x170/0x7a8 fs/nilfs2/inode.c:83 stack backtrace: CPU: 1 UID: 0 PID: 9103 Comm: syz.1.511 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 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_lookup_contig+0x114/0x13c fs/nilfs2/bmap.c:100 nilfs_get_block+0x1a0/0x7a8 fs/nilfs2/inode.c:84 block_truncate_page+0x2f4/0x6b8 fs/buffer.c:2702 nilfs_truncate+0x1ec/0x400 fs/nilfs2/inode.c:804 nilfs_setattr+0x1c8/0x26c fs/nilfs2/inode.c:920 notify_change+0x9a4/0xc50 fs/attr.c:552 do_truncate+0x178/0x1f0 fs/open.c:65 vfs_truncate+0x398/0x444 fs/open.c:115 do_sys_truncate+0xe4/0x1a8 fs/open.c:138 __do_sys_truncate fs/open.c:150 [inline] __se_sys_truncate fs/open.c:148 [inline] __arm64_sys_truncate+0x5c/0x74 fs/open.c:148 __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 Remounting filesystem read-only