====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.5.2929/17946 is trying to acquire lock: ffff8880548bf6e8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_init_acl+0x2fd/0x7e0 fs/ocfs2/acl.c:367 but task is already holding lock: ffff888031f210e0 (&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x3ae/0x700 fs/ocfs2/journal.c:369 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&journal->j_trans_barrier){.+.+}-{4:4}: down_read+0x4a/0x330 kernel/locking/rwsem.c:1574 ocfs2_start_trans+0x3ae/0x700 fs/ocfs2/journal.c:369 ocfs2_shutdown_local_alloc+0x1ef/0xa50 fs/ocfs2/localalloc.c:417 ocfs2_dismount_volume+0x1e2/0x820 fs/ocfs2/super.c:1824 generic_shutdown_super+0x13d/0x2d0 fs/super.c:769 kill_block_super+0x44/0xa0 fs/super.c:1918 deactivate_locked_super+0xbc/0x110 fs/super.c:603 cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (sb_internal#2){.+.+}-{0:0}: __lock_release kernel/locking/lockdep.c:5592 [inline] lock_release+0x199/0x3c0 kernel/locking/lockdep.c:5907 up_write+0x2d/0x4a0 kernel/locking/rwsem.c:1687 inode_unlock include/linux/fs.h:1035 [inline] ocfs2_free_ac_resource fs/ocfs2/suballoc.c:131 [inline] ocfs2_free_alloc_context+0x97/0x1a0 fs/ocfs2/suballoc.c:145 ocfs2_write_begin_nolock+0x4164/0x41f0 fs/ocfs2/aops.c:1805 ocfs2_write_begin+0x1ba/0x310 fs/ocfs2/aops.c:1885 generic_perform_write+0x2d5/0x8f0 mm/filemap.c:4364 ocfs2_file_write_iter+0x1706/0x1f10 fs/ocfs2/file.c:2481 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_pwrite64 fs/read_write.c:794 [inline] __do_sys_pwrite64 fs/read_write.c:802 [inline] __se_sys_pwrite64 fs/read_write.c:799 [inline] __x64_sys_pwrite64+0x196/0x220 fs/read_write.c:799 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&oi->ip_alloc_sem){++++}-{4:4}: down_write+0x96/0x200 kernel/locking/rwsem.c:1631 ocfs2_try_remove_refcount_tree+0xb6/0x360 fs/ocfs2/refcounttree.c:932 ocfs2_truncate_file+0xe91/0x14b0 fs/ocfs2/file.c:527 ocfs2_setattr+0x1641/0x1d10 fs/ocfs2/file.c:1224 notify_change+0xbba/0xea0 fs/attr.c:556 do_truncate+0x1c2/0x250 fs/open.c:68 handle_truncate fs/namei.c:4300 [inline] do_open fs/namei.c:4841 [inline] path_openat+0x15b5/0x1d60 fs/namei.c:5000 do_file_open+0x23e/0x4a0 fs/namei.c:5029 do_sys_openat2+0x115/0x200 fs/open.c:1417 do_sys_open fs/open.c:1423 [inline] __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1434 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&oi->ip_xattr_sem){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3181 [inline] check_prevs_add kernel/locking/lockdep.c:3300 [inline] validate_chain kernel/locking/lockdep.c:3924 [inline] __lock_acquire+0x1520/0x2cf0 kernel/locking/lockdep.c:5253 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5886 down_read+0x4a/0x330 kernel/locking/rwsem.c:1574 ocfs2_init_acl+0x2fd/0x7e0 fs/ocfs2/acl.c:367 ocfs2_mknod+0x166a/0x2240 fs/ocfs2/namei.c:414 ocfs2_mkdir+0x180/0x430 fs/ocfs2/namei.c:660 vfs_mkdir+0x40c/0x620 fs/namei.c:5410 filename_mkdirat+0x285/0x510 fs/namei.c:5443 __do_sys_mkdirat fs/namei.c:5464 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5461 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &oi->ip_xattr_sem --> sb_internal#2 --> &journal->j_trans_barrier Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&journal->j_trans_barrier); lock(sb_internal#2); lock(&journal->j_trans_barrier); rlock(&oi->ip_xattr_sem); *** DEADLOCK *** locks held by syz.5.2929/17946: 8, last CPU#1: #0: ffff888050cca460 (sb_writers#26){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:494 #1: ffff8880548bf9a0 (&type->i_mutex_dir_key#18/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1070 [inline] #1: ffff8880548bf9a0 (&type->i_mutex_dir_key#18/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2918 [inline] #1: ffff8880548bf9a0 (&type->i_mutex_dir_key#18/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2942 [inline] #1: ffff8880548bf9a0 (&type->i_mutex_dir_key#18/1){+.+.}-{4:4}, at: filename_create+0x200/0x370 fs/namei.c:5092 #2: ffff88807ca65da0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1025 [inline] #2: ffff88807ca65da0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x170/0x4850 fs/ocfs2/suballoc.c:904 #3: ffff88807ca64fa0 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1025 [inline] #3: ffff88807ca64fa0 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x170/0x4850 fs/ocfs2/suballoc.c:904 #4: ffff88807ca609a0 (&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1025 [inline] #4: ffff88807ca609a0 (&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x170/0x4850 fs/ocfs2/suballoc.c:904 #5: ffff888050cca650 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_mknod+0x116a/0x2240 fs/ocfs2/namei.c:365 #6: ffff888031f210e0 (&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x3ae/0x700 fs/ocfs2/journal.c:369 #7: ffff88807a584938 (jbd2_handle#3){.+.+}-{0:0}, at: start_this_handle+0x1fbf/0x2200 fs/jbd2/transaction.c:444 stack backtrace: CPU: 1 UID: 0 PID: 17946 Comm: syz.5.2929 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2059 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2191 check_prev_add kernel/locking/lockdep.c:3181 [inline] check_prevs_add kernel/locking/lockdep.c:3300 [inline] validate_chain kernel/locking/lockdep.c:3924 [inline] __lock_acquire+0x1520/0x2cf0 kernel/locking/lockdep.c:5253 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5886 down_read+0x4a/0x330 kernel/locking/rwsem.c:1574 ocfs2_init_acl+0x2fd/0x7e0 fs/ocfs2/acl.c:367 ocfs2_mknod+0x166a/0x2240 fs/ocfs2/namei.c:414 ocfs2_mkdir+0x180/0x430 fs/ocfs2/namei.c:660 vfs_mkdir+0x40c/0x620 fs/namei.c:5410 filename_mkdirat+0x285/0x510 fs/namei.c:5443 __do_sys_mkdirat fs/namei.c:5464 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5461 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7efe78b9e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007efe79b31028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007efe78e25fa0 RCX: 00007efe78b9e0d9 RDX: 00000000000001c0 RSI: 0000200000000040 RDI: ffffffffffffff9c RBP: 00007efe78c35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efe78e26038 R14: 00007efe78e25fa0 R15: 00007ffeed8dd078