REISERFS warning (device loop7): sh-2029: %s: bitmap block (#%u) reading failed reiserfs_read_bitmap_block: reiserfs_read_bitmap_block ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.7.424/8615 is trying to acquire lock: ffff000106d08980 (&type->i_mutex_dir_key#22/3){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] ffff000106d08980 (&type->i_mutex_dir_key#22/3){+.+.}-{3:3}, at: open_xa_root fs/reiserfs/xattr.c:127 [inline] ffff000106d08980 (&type->i_mutex_dir_key#22/3){+.+.}-{3:3}, at: open_xa_dir+0x124/0x5ec fs/reiserfs/xattr.c:152 but task is already holding lock: ffff0000ef36b090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x68/0xdc fs/reiserfs/lock.c:78 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sbi->lock){+.+.}-{3:3}: __mutex_lock_common+0x1a0/0x1f3c kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27 reiserfs_mkdir+0x294/0x7d4 fs/reiserfs/namei.c:831 xattr_mkdir fs/reiserfs/xattr.c:76 [inline] open_xa_root fs/reiserfs/xattr.c:136 [inline] open_xa_dir+0x290/0x5ec fs/reiserfs/xattr.c:152 xattr_lookup+0x3c/0x268 fs/reiserfs/xattr.c:395 reiserfs_xattr_set_handle+0xe8/0xdbc fs/reiserfs/xattr.c:533 __reiserfs_set_acl+0x498/0x614 fs/reiserfs/xattr_acl.c:276 reiserfs_set_acl+0x3c0/0x574 fs/reiserfs/xattr_acl.c:50 set_posix_acl fs/posix_acl.c:1160 [inline] posix_acl_xattr_set+0x2f8/0x394 fs/posix_acl.c:1189 __vfs_setxattr+0x374/0x390 fs/xattr.c:182 __vfs_setxattr_noperm+0x120/0x56c fs/xattr.c:216 __vfs_setxattr_locked+0x1e8/0x214 fs/xattr.c:277 vfs_setxattr+0x158/0x2a8 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x258/0x2d8 fs/xattr.c:617 __do_sys_fsetxattr fs/xattr.c:673 [inline] __se_sys_fsetxattr fs/xattr.c:662 [inline] __arm64_sys_fsetxattr+0x1b8/0x234 fs/xattr.c:662 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #0 (&type->i_mutex_dir_key#22/3){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2808/0x6634 kernel/locking/lockdep.c:5063 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676 down_write_nested+0x64/0x94 kernel/locking/rwsem.c:1689 inode_lock_nested include/linux/fs.h:793 [inline] open_xa_root fs/reiserfs/xattr.c:127 [inline] open_xa_dir+0x124/0x5ec fs/reiserfs/xattr.c:152 reiserfs_for_each_xattr+0x18c/0x6f8 fs/reiserfs/xattr.c:252 reiserfs_delete_xattrs+0x2c/0xa4 fs/reiserfs/xattr.c:364 reiserfs_evict_inode+0x1f0/0x408 fs/reiserfs/inode.c:53 evict+0x3d8/0x824 fs/inode.c:705 iput_final fs/inode.c:1834 [inline] iput+0x728/0x7e8 fs/inode.c:1860 reiserfs_new_inode+0x498/0x13f0 fs/reiserfs/inode.c:2156 reiserfs_create+0x354/0x5f4 fs/reiserfs/namei.c:668 lookup_open fs/namei.c:3490 [inline] open_last_lookups fs/namei.c:3558 [inline] path_openat+0xda8/0x27a0 fs/namei.c:3788 do_filp_open+0x198/0x38c fs/namei.c:3818 do_sys_openat2+0x134/0x3fc fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __arm64_sys_openat+0x11c/0x150 fs/open.c:1347 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->lock); lock(&type->i_mutex_dir_key#22/3); lock(&sbi->lock); lock(&type->i_mutex_dir_key#22/3); *** DEADLOCK *** 3 locks held by syz.7.424/8615: #0: ffff00010ef62460 (sb_writers#35){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:402 #1: ffff000106d082e0 (&type->i_mutex_dir_key#22){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff000106d082e0 (&type->i_mutex_dir_key#22){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3555 [inline] #1: ffff000106d082e0 (&type->i_mutex_dir_key#22){+.+.}-{3:3}, at: path_openat+0x5dc/0x27a0 fs/namei.c:3788 #2: ffff0000ef36b090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x68/0xdc fs/reiserfs/lock.c:78 stack backtrace: CPU: 0 PID: 8615 Comm: syz.7.424 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2048 check_noncircular+0x264/0x2f8 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2808/0x6634 kernel/locking/lockdep.c:5063 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676 down_write_nested+0x64/0x94 kernel/locking/rwsem.c:1689 inode_lock_nested include/linux/fs.h:793 [inline] open_xa_root fs/reiserfs/xattr.c:127 [inline] open_xa_dir+0x124/0x5ec fs/reiserfs/xattr.c:152 reiserfs_for_each_xattr+0x18c/0x6f8 fs/reiserfs/xattr.c:252 reiserfs_delete_xattrs+0x2c/0xa4 fs/reiserfs/xattr.c:364 reiserfs_evict_inode+0x1f0/0x408 fs/reiserfs/inode.c:53 evict+0x3d8/0x824 fs/inode.c:705 iput_final fs/inode.c:1834 [inline] iput+0x728/0x7e8 fs/inode.c:1860 reiserfs_new_inode+0x498/0x13f0 fs/reiserfs/inode.c:2156 reiserfs_create+0x354/0x5f4 fs/reiserfs/namei.c:668 lookup_open fs/namei.c:3490 [inline] open_last_lookups fs/namei.c:3558 [inline] path_openat+0xda8/0x27a0 fs/namei.c:3788 do_filp_open+0x198/0x38c fs/namei.c:3818 do_sys_openat2+0x134/0x3fc fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __arm64_sys_openat+0x11c/0x150 fs/open.c:1347 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585