NILFS (loop5): vblocknr = 23 has abnormal lifetime: start cno (= 4294967298) > current cno (= 3) NILFS error (device loop5): nilfs_bmap_propagate: broken bmap (inode number=4) ====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc4-syzkaller-00011-gf15d97df5afa #0 Not tainted ------------------------------------------------------ segctord/9478 is trying to acquire lock: ffff88805a65e090 (&nilfs->ns_sem){++++}-{4:4}, at: nilfs_set_error fs/nilfs2/super.c:92 [inline] ffff88805a65e090 (&nilfs->ns_sem){++++}-{4:4}, at: __nilfs_error+0x232/0x4d0 fs/nilfs2/super.c:141 but task is already holding lock: ffff88805a65e2a0 (&nilfs->ns_segctor_sem){++++}-{4:4}, at: nilfs_transaction_lock+0x266/0x410 fs/nilfs2/segment.c:357 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&nilfs->ns_segctor_sem){++++}-{4:4}: down_read+0x9b/0x480 kernel/locking/rwsem.c:1524 nilfs_transaction_begin+0x326/0xa40 fs/nilfs2/segment.c:221 nilfs_create+0xb6/0x320 fs/nilfs2/namei.c:95 lookup_open.isra.0+0x11d3/0x1580 fs/namei.c:3701 open_last_lookups fs/namei.c:3800 [inline] path_openat+0x905/0x2d40 fs/namei.c:4036 do_filp_open+0x20b/0x470 fs/namei.c:4066 do_sys_openat2+0x11b/0x1d0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_open fs/open.c:1452 [inline] __se_sys_open fs/open.c:1448 [inline] __x64_sys_open+0x153/0x1e0 fs/open.c:1448 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #4 (sb_internal#5){.+.+}-{0:0}: 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+0x21b/0xa40 fs/nilfs2/segment.c:218 nilfs_page_mkwrite+0x963/0xcd0 fs/nilfs2/file.c:95 do_page_mkwrite+0x174/0x380 mm/memory.c:3287 do_shared_fault mm/memory.c:5594 [inline] do_fault mm/memory.c:5656 [inline] do_pte_missing+0x29c/0x3fb0 mm/memory.c:4160 handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x103d/0x2a40 mm/memory.c:6140 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309 do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1388 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #3 (sb_pagefaults#6){.+.+}-{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+0x248/0xcd0 fs/nilfs2/file.c:57 do_page_mkwrite+0x174/0x380 mm/memory.c:3287 do_shared_fault mm/memory.c:5594 [inline] do_fault mm/memory.c:5656 [inline] do_pte_missing+0x29c/0x3fb0 mm/memory.c:4160 handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x103d/0x2a40 mm/memory.c:6140 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309 do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1388 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #2 (&mm->mmap_lock){++++}-{4:4}: __might_fault mm/memory.c:7151 [inline] __might_fault+0x113/0x190 mm/memory.c:7145 _copy_to_iter+0x1c6/0x15a0 lib/iov_iter.c:184 copy_page_to_iter lib/iov_iter.c:362 [inline] copy_page_to_iter+0xf1/0x180 lib/iov_iter.c:349 copy_folio_to_iter include/linux/uio.h:198 [inline] filemap_read+0x6b1/0xe90 mm/filemap.c:2753 blkdev_read_iter+0x1ac/0x500 block/fops.c:809 new_sync_read fs/read_write.c:489 [inline] vfs_read+0x8cb/0xc70 fs/read_write.c:570 ksys_read+0x12a/0x240 fs/read_write.c:713 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&sb->s_type->i_mutex_key#8){++++}-{4:4}: down_write+0x92/0x200 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:867 [inline] set_blocksize+0x1e0/0x500 block/bdev.c:203 sb_set_blocksize block/bdev.c:224 [inline] sb_min_blocksize+0x149/0x270 block/bdev.c:239 init_nilfs+0x94/0x15a0 fs/nilfs2/the_nilfs.c:710 nilfs_fill_super fs/nilfs2/super.c:1060 [inline] nilfs_get_tree+0x654/0x10f0 fs/nilfs2/super.c:1228 vfs_get_tree+0x8e/0x340 fs/super.c:1759 do_new_mount fs/namespace.c:3884 [inline] path_mount+0x14d4/0x1f20 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] __x64_sys_mount+0x28d/0x310 fs/namespace.c:4412 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #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+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 down_write+0x92/0x200 kernel/locking/rwsem.c:1577 nilfs_set_error fs/nilfs2/super.c:92 [inline] __nilfs_error+0x232/0x4d0 fs/nilfs2/super.c:141 nilfs_bmap_convert_error fs/nilfs2/bmap.c:35 [inline] nilfs_bmap_propagate+0x131/0x170 fs/nilfs2/bmap.c:332 nilfs_collect_file_data+0x49/0xd0 fs/nilfs2/segment.c:589 nilfs_segctor_apply_buffers+0x14d/0x480 fs/nilfs2/segment.c:1010 nilfs_segctor_scan_file+0x3f7/0x700 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+0xec4/0x8220 fs/nilfs2/segment.c:2122 nilfs_segctor_construct+0x748/0x900 fs/nilfs2/segment.c:2478 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2586 [inline] nilfs_segctor_thread+0x650/0xa60 fs/nilfs2/segment.c:2700 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 other info that might help us debug this: Chain exists of: &nilfs->ns_sem --> sb_internal#5 --> &nilfs->ns_segctor_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&nilfs->ns_segctor_sem); lock(sb_internal#5); lock(&nilfs->ns_segctor_sem); lock(&nilfs->ns_sem); *** DEADLOCK *** 1 lock held by segctord/9478: #0: ffff88805a65e2a0 (&nilfs->ns_segctor_sem){++++}-{4:4}, at: nilfs_transaction_lock+0x266/0x410 fs/nilfs2/segment.c:357 stack backtrace: CPU: 0 UID: 0 PID: 9478 Comm: segctord Not tainted 6.15.0-rc4-syzkaller-00011-gf15d97df5afa #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2079 check_noncircular+0x14c/0x170 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+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 down_write+0x92/0x200 kernel/locking/rwsem.c:1577 nilfs_set_error fs/nilfs2/super.c:92 [inline] __nilfs_error+0x232/0x4d0 fs/nilfs2/super.c:141 nilfs_bmap_convert_error fs/nilfs2/bmap.c:35 [inline] nilfs_bmap_propagate+0x131/0x170 fs/nilfs2/bmap.c:332 nilfs_collect_file_data+0x49/0xd0 fs/nilfs2/segment.c:589 nilfs_segctor_apply_buffers+0x14d/0x480 fs/nilfs2/segment.c:1010 nilfs_segctor_scan_file+0x3f7/0x700 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+0xec4/0x8220 fs/nilfs2/segment.c:2122 nilfs_segctor_construct+0x748/0x900 fs/nilfs2/segment.c:2478 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2586 [inline] nilfs_segctor_thread+0x650/0xa60 fs/nilfs2/segment.c:2700 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Remounting filesystem read-only