====================================================== WARNING: possible circular locking dependency detected 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0 Not tainted ------------------------------------------------------ syz-executor.1/6047 is trying to acquire lock: ffffffff8dd3aac0 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:334 [inline] ffffffff8dd3aac0 (fs_reclaim){+.+.}-{0:0}, at: prepare_alloc_pages.constprop.0+0x155/0x560 mm/page_alloc.c:4449 but task is already holding lock: ffff88802b0b22a0 (&nilfs->ns_segctor_sem){++++}-{3:3}, at: nilfs_transaction_begin+0x326/0xa40 fs/nilfs2/segment.c:223 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&nilfs->ns_segctor_sem){++++}-{3:3}: down_read+0x9a/0x330 kernel/locking/rwsem.c:1526 nilfs_transaction_begin+0x326/0xa40 fs/nilfs2/segment.c:223 nilfs_create+0xb7/0x320 fs/nilfs2/namei.c:82 lookup_open.isra.0+0x10a1/0x13c0 fs/namei.c:3505 open_last_lookups fs/namei.c:3574 [inline] path_openat+0x92f/0x29f0 fs/namei.c:3804 do_filp_open+0x1dc/0x430 fs/namei.c:3834 do_sys_openat2+0x17a/0x1e0 fs/open.c:1405 do_sys_open fs/open.c:1420 [inline] __do_compat_sys_open fs/open.c:1471 [inline] __se_compat_sys_open fs/open.c:1469 [inline] __ia32_compat_sys_open+0x147/0x1e0 fs/open.c:1469 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e -> #1 (sb_internal#2){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1655 [inline] sb_start_intwrite include/linux/fs.h:1838 [inline] nilfs_transaction_begin+0x21b/0xa40 fs/nilfs2/segment.c:220 nilfs_dirty_inode+0x1a4/0x270 fs/nilfs2/inode.c:1153 __mark_inode_dirty+0x1f0/0xe70 fs/fs-writeback.c:2486 mark_inode_dirty_sync include/linux/fs.h:2409 [inline] iput.part.0+0x5b/0x7f0 fs/inode.c:1764 iput+0x5c/0x80 fs/inode.c:1757 dentry_unlink_inode+0x295/0x480 fs/dcache.c:400 __dentry_kill+0x1d0/0x600 fs/dcache.c:603 shrink_kill fs/dcache.c:1048 [inline] shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1075 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1156 super_cache_scan+0x32a/0x550 fs/super.c:221 do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0xa87/0x1310 mm/shrinker.c:626 shrink_one+0x493/0x7c0 mm/vmscan.c:4790 shrink_many mm/vmscan.c:4851 [inline] lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4951 shrink_node mm/vmscan.c:5910 [inline] kswapd_shrink_node mm/vmscan.c:6720 [inline] balance_pgdat+0x1105/0x1970 mm/vmscan.c:6911 kswapd+0x5ea/0xbf0 mm/vmscan.c:7180 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #0 (fs_reclaim){+.+.}-{0:0}: 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+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __fs_reclaim_acquire mm/page_alloc.c:3801 [inline] fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3815 might_alloc include/linux/sched/mm.h:334 [inline] prepare_alloc_pages.constprop.0+0x155/0x560 mm/page_alloc.c:4449 __alloc_pages_noprof+0x194/0x2460 mm/page_alloc.c:4667 alloc_pages_mpol_noprof+0x275/0x610 mm/mempolicy.c:2265 folio_alloc_noprof+0x1e/0xc0 mm/mempolicy.c:2343 filemap_alloc_folio_noprof+0x3ba/0x490 mm/filemap.c:1008 __filemap_get_folio+0x51e/0xa80 mm/filemap.c:1950 pagecache_get_page+0x2c/0x250 mm/folio-compat.c:87 block_write_begin+0x38/0x4a0 fs/buffer.c:2232 nilfs_write_begin+0x9f/0x1a0 fs/nilfs2/inode.c:262 page_symlink+0x356/0x450 fs/namei.c:5236 nilfs_symlink+0x23c/0x3c0 fs/nilfs2/namei.c:153 vfs_symlink fs/namei.c:4489 [inline] vfs_symlink+0x3e8/0x660 fs/namei.c:4473 do_symlinkat+0x263/0x310 fs/namei.c:4515 __do_sys_symlink fs/namei.c:4536 [inline] __se_sys_symlink fs/namei.c:4534 [inline] __ia32_sys_symlink+0x78/0xa0 fs/namei.c:4534 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e other info that might help us debug this: Chain exists of: fs_reclaim --> sb_internal#2 --> &nilfs->ns_segctor_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&nilfs->ns_segctor_sem); lock(sb_internal#2); lock(&nilfs->ns_segctor_sem); lock(fs_reclaim); *** DEADLOCK *** 4 locks held by syz-executor.1/6047: #0: ffff888021bb2420 (sb_writers#12){.+.+}-{0:0}, at: filename_create+0x10d/0x530 fs/namei.c:3893 #1: ffff888062a5a918 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:826 [inline] #1: ffff888062a5a918 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: filename_create+0x1c2/0x530 fs/namei.c:3900 #2: ffff888021bb2610 (sb_internal#2){.+.+}-{0:0}, at: nilfs_symlink+0x114/0x3c0 fs/nilfs2/namei.c:140 #3: ffff88802b0b22a0 (&nilfs->ns_segctor_sem){++++}-{3:3} , at: nilfs_transaction_begin+0x326/0xa40 fs/nilfs2/segment.c:223 stack backtrace: CPU: 2 PID: 6047 Comm: syz-executor.1 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 check_noncircular+0x31a/0x400 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+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __fs_reclaim_acquire mm/page_alloc.c:3801 [inline] fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3815 might_alloc include/linux/sched/mm.h:334 [inline] prepare_alloc_pages.constprop.0+0x155/0x560 mm/page_alloc.c:4449 __alloc_pages_noprof+0x194/0x2460 mm/page_alloc.c:4667 alloc_pages_mpol_noprof+0x275/0x610 mm/mempolicy.c:2265 folio_alloc_noprof+0x1e/0xc0 mm/mempolicy.c:2343 filemap_alloc_folio_noprof+0x3ba/0x490 mm/filemap.c:1008 __filemap_get_folio+0x51e/0xa80 mm/filemap.c:1950 pagecache_get_page+0x2c/0x250 mm/folio-compat.c:87 block_write_begin+0x38/0x4a0 fs/buffer.c:2232 nilfs_write_begin+0x9f/0x1a0 fs/nilfs2/inode.c:262 page_symlink+0x356/0x450 fs/namei.c:5236 nilfs_symlink+0x23c/0x3c0 fs/nilfs2/namei.c:153 vfs_symlink fs/namei.c:4489 [inline] vfs_symlink+0x3e8/0x660 fs/namei.c:4473 do_symlinkat+0x263/0x310 fs/namei.c:4515 __do_sys_symlink fs/namei.c:4536 [inline] __se_sys_symlink fs/namei.c:4534 [inline] __ia32_sys_symlink+0x78/0xa0 fs/namei.c:4534 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7270579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f5e415ac EFLAGS: 00000292 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000020000680 RCX: 0000000020000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 syz-executor.1: attempt to access beyond end of device loop1: rw=0, sector=24, nr_sectors = 2 limit=0 NILFS (loop1): I/O error reading meta-data file (ino=3, block-offset=0) ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi