====================================================== audit: type=1800 audit(1672362127.158:2): pid=7994 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor377" name="bus" dev="loop0" ino=25 res=0 audit: type=1800 audit(1672362127.188:3): pid=7994 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor377" name="file1" dev="loop0" ino=20 res=0 ====================================================== WARNING: possible circular locking dependency detected 4.14.302-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor377/7994 is trying to acquire lock: (&tree->tree_lock/1){+.+.}, at: [] hfsplus_find_init+0x161/0x220 fs/hfsplus/bfind.c:33 but task is already holding lock: (&HFSPLUS_I(inode)->extents_lock){+.+.}, at: [] hfsplus_file_truncate+0x1ba/0xe80 fs/hfsplus/extents.c:571 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&HFSPLUS_I(inode)->extents_lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 hfsplus_file_extend+0x188/0xef0 fs/hfsplus/extents.c:452 hfsplus_bmap_reserve+0x26e/0x410 fs/hfsplus/btree.c:357 __hfsplus_ext_write_extent+0x415/0x560 fs/hfsplus/extents.c:104 __hfsplus_ext_cache_extent fs/hfsplus/extents.c:186 [inline] hfsplus_ext_read_extent+0x81a/0x9e0 fs/hfsplus/extents.c:218 hfsplus_file_extend+0x616/0xef0 fs/hfsplus/extents.c:456 hfsplus_get_block+0x15b/0x820 fs/hfsplus/extents.c:245 __block_write_begin_int+0x35c/0x11d0 fs/buffer.c:2038 __block_write_begin fs/buffer.c:2088 [inline] block_write_begin+0x58/0x270 fs/buffer.c:2147 cont_write_begin+0x4a3/0x740 fs/buffer.c:2497 hfsplus_write_begin+0x87/0x130 fs/hfsplus/inode.c:53 cont_expand_zero fs/buffer.c:2424 [inline] cont_write_begin+0x296/0x740 fs/buffer.c:2487 hfsplus_write_begin+0x87/0x130 fs/hfsplus/inode.c:53 generic_cont_expand_simple+0xe1/0x130 fs/buffer.c:2388 hfsplus_setattr+0x139/0x310 fs/hfsplus/inode.c:258 notify_change+0x56b/0xd10 fs/attr.c:315 do_truncate+0xff/0x1a0 fs/open.c:63 do_sys_ftruncate.constprop.0+0x3a3/0x480 fs/open.c:205 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 -> #0 (&tree->tree_lock/1){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 hfsplus_find_init+0x161/0x220 fs/hfsplus/bfind.c:33 hfsplus_file_truncate+0x25b/0xe80 fs/hfsplus/extents.c:577 hfsplus_setattr+0x182/0x310 fs/hfsplus/inode.c:264 notify_change+0x56b/0xd10 fs/attr.c:315 do_truncate+0xff/0x1a0 fs/open.c:63 do_sys_ftruncate.constprop.0+0x3a3/0x480 fs/open.c:205 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&HFSPLUS_I(inode)->extents_lock); lock(&tree->tree_lock/1); lock(&HFSPLUS_I(inode)->extents_lock); lock(&tree->tree_lock/1); *** DEADLOCK *** 3 locks held by syz-executor377/7994: #0: (sb_writers#10){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] #0: (sb_writers#10){.+.+}, at: [] do_sys_ftruncate.constprop.0+0x1fb/0x480 fs/open.c:200 #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] inode_lock include/linux/fs.h:719 [inline] #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] do_truncate+0xf0/0x1a0 fs/open.c:61 #2: (&HFSPLUS_I(inode)->extents_lock){+.+.}, at: [] hfsplus_file_truncate+0x1ba/0xe80 fs/hfsplus/extents.c:571 stack backtrace: CPU: 1 PID: 7994 Comm: syz-executor377 Not tainted 4.14.302-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 hfsplus_find_init+0x161/0x220 fs/hfsplus/bfind.c:33 hfsplus_file_truncate+0x25b/0xe80 fs/hfsplus/extents.c:577 hfsplus_setattr+0x182/0x310 fs/hfsplus/inode.c:264 notify_change+0x56b/0xd10 fs/attr.c:315 do_truncate+0xff/0x1a0 fs/open.c:63 do_sys_ftruncate.constprop.0+0x3a3/0x480 fs/open.c:205 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7f87deec67e9 RSP: 002b:00007ffd1fa83b08 EFLAGS: 00000246 ORIG_RAX: 000000000000004d