kvm: pic: level sensitive irq not supported kvm: pic: non byte read ====================================================== WARNING: possible circular locking dependency detected 4.14.303-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/11500 is trying to acquire lock: (&ovl_i_mutex_dir_key[depth]#2){++++}, at: [] inode_lock_shared include/linux/fs.h:729 [inline] (&ovl_i_mutex_dir_key[depth]#2){++++}, at: [] lookup_slow+0x129/0x400 fs/namei.c:1674 but task is already holding lock: (&oi->lock){+.+.}, at: [] ovl_nlink_start+0x22f/0x460 fs/overlayfs/util.c:523 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&oi->lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 ovl_copy_up_start+0x40/0xe0 fs/overlayfs/util.c:318 ovl_copy_up_one+0x21f/0x910 fs/overlayfs/copy_up.c:631 overlayfs: fs on 'file0' does not support file handles, falling back to index=off. ovl_copy_up_flags+0xd5/0x120 fs/overlayfs/copy_up.c:686 ovl_rename+0x164/0xe50 fs/overlayfs/dir.c:939 vfs_rename+0x560/0x1820 fs/namei.c:4498 SYSC_renameat2 fs/namei.c:4646 [inline] SyS_renameat2+0x95b/0xad0 fs/namei.c:4535 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 -> #1 (sb_writers#6){.+.+}: percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x64/0x260 fs/super.c:1342 sb_start_write include/linux/fs.h:1551 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 ovl_xattr_set+0x4d/0x290 fs/overlayfs/inode.c:214 __vfs_setxattr+0xdc/0x130 fs/xattr.c:150 __vfs_setxattr_noperm+0xfd/0x3d0 fs/xattr.c:181 __vfs_setxattr_locked+0x14d/0x250 fs/xattr.c:239 vfs_setxattr+0xcf/0x230 fs/xattr.c:256 setxattr+0x1a9/0x300 fs/xattr.c:523 path_setxattr+0x118/0x130 fs/xattr.c:542 SYSC_lsetxattr fs/xattr.c:564 [inline] SyS_lsetxattr+0x33/0x40 fs/xattr.c:560 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 -> #0 (&ovl_i_mutex_dir_key[depth]#2){++++}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 down_read+0x36/0x80 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:729 [inline] lookup_slow+0x129/0x400 fs/namei.c:1674 lookup_one_len_unlocked+0x3a0/0x410 fs/namei.c:2595 ovl_lower_positive+0x184/0x350 fs/overlayfs/namei.c:783 ovl_rename+0x47c/0xe50 fs/overlayfs/dir.c:968 vfs_rename+0x560/0x1820 fs/namei.c:4498 SYSC_renameat2 fs/namei.c:4646 [inline] SyS_renameat2+0x95b/0xad0 fs/namei.c:4535 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: Chain exists of: &ovl_i_mutex_dir_key[depth]#2 --> sb_writers#6 --> &oi->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&oi->lock); lock(sb_writers#6); lock(&oi->lock); lock(&ovl_i_mutex_dir_key[depth]#2); *** DEADLOCK *** 8 locks held by syz-executor.4/11500: #0: (sb_writers#13){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] #0: (sb_writers#13){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 #1: (&type->s_vfs_rename_key#2){+.+.}, at: [] lock_rename+0x54/0x280 fs/namei.c:2889 #2: (&ovl_i_mutex_dir_key[depth]/1){+.+.}, at: [] inode_lock_nested include/linux/fs.h:754 [inline] #2: (&ovl_i_mutex_dir_key[depth]/1){+.+.}, at: [] lock_rename+0xa0/0x280 fs/namei.c:2893 #3: (&ovl_i_mutex_dir_key[depth]/2){+.+.}, at: [] inode_lock_nested include/linux/fs.h:754 [inline] #3: (&ovl_i_mutex_dir_key[depth]/2){+.+.}, at: [] lock_rename+0xd4/0x280 fs/namei.c:2894 #4: (&ovl_i_mutex_key[depth]){+.+.}, at: [] inode_lock include/linux/fs.h:719 [inline] #4: (&ovl_i_mutex_key[depth]){+.+.}, at: [] lock_two_nondirectories+0xca/0xf0 fs/inode.c:989 #5: (&ovl_i_mutex_key[depth]/4){+.+.}, at: [] inode_lock_nested include/linux/fs.h:754 [inline] #5: (&ovl_i_mutex_key[depth]/4){+.+.}, at: [] lock_two_nondirectories+0xb2/0xf0 fs/inode.c:991 #6: (sb_writers#3){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] #6: (sb_writers#3){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 #7: (&oi->lock){+.+.}, at: [] ovl_nlink_start+0x22f/0x460 fs/overlayfs/util.c:523 stack backtrace: CPU: 1 PID: 11500 Comm: syz-executor.4 Not tainted 4.14.303-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 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 down_read+0x36/0x80 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:729 [inline] lookup_slow+0x129/0x400 fs/namei.c:1674 lookup_one_len_unlocked+0x3a0/0x410 fs/namei.c:2595 ovl_lower_positive+0x184/0x350 fs/overlayfs/namei.c:783 ovl_rename+0x47c/0xe50 fs/overlayfs/dir.c:968 vfs_rename+0x560/0x1820 fs/namei.c:4498 SYSC_renameat2 fs/namei.c:4646 [inline] SyS_renameat2+0x95b/0xad0 fs/namei.c:4535 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7fa8ed9200c9 RSP: 002b:00007fa8ebe92168 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007fa8eda3ff80 RCX: 00007fa8ed9200c9 RDX: 0000000000000000 RSI: 0000000020000500 RDI: 00000000200003c0 RBP: 00007fa8ed97bae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd9c0548bf R14: 00007fa8ebe92300 R15: 0000000000022000 kvm: pic: level sensitive irq not supported overlayfs: fs on './file0' does not support file handles, falling back to index=off. kvm: pic: level sensitive irq not supported overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. pit: kvm: requested 4190 ns i8254 timer period limited to 500000 ns overlayfs: fs on 'file0' does not support file handles, falling back to index=off. kvm: pic: non byte read kvm: pic: level sensitive irq not supported overlayfs: fs on './file0' does not support file handles, falling back to index=off. pit: kvm: requested 4190 ns i8254 timer period limited to 500000 ns pit: kvm: requested 4190 ns i8254 timer period limited to 500000 ns picdev_read: 7 callbacks suppressed kvm: pic: non byte read kvm: pic: non byte read pic_ioport_write: 6 callbacks suppressed kvm: pic: level sensitive irq not supported kvm: pic: level sensitive irq not supported kvm: pic: non byte read kvm: pic: non byte read kvm: pic: level sensitive irq not supported kvm: pic: non byte read kvm: pic: level sensitive irq not supported kvm: pic: non byte read kvm: pic: level sensitive irq not supported kvm: pic: non byte read kvm: pic: level sensitive irq not supported kvm: pic: non byte read kvm: pic: level sensitive irq not supported kvm: pic: non byte read kvm: pic: level sensitive irq not supported kvm: pic: non byte read kvm: pic: level sensitive irq not supported kvm: pic: level sensitive irq not supported pit: kvm: requested 4190 ns i8254 timer period limited to 500000 ns pit: kvm: requested 4190 ns i8254 timer period limited to 500000 ns audit: type=1804 audit(1674505068.883:50): pid=11736 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir319937861/syzkaller.YO2VGd/77/memory.events" dev="sda1" ino=14295 res=1 audit: type=1800 audit(1674505068.923:51): pid=11736 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="memory.events" dev="sda1" ino=14295 res=0 audit: type=1804 audit(1674505069.183:52): pid=11746 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir319937861/syzkaller.YO2VGd/78/memory.events" dev="sda1" ino=14287 res=1 audit: type=1800 audit(1674505069.183:53): pid=11746 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="memory.events" dev="sda1" ino=14287 res=0 BTRFS: device fsid e417788f-7a09-42b2-9266-8ddc5d5d35d2 devid 1 transid 8 /dev/loop0 BTRFS error (device loop0): unsupported checksum algorithm 1 BTRFS error (device loop0): superblock checksum mismatch BTRFS error (device loop0): open_ctree failed audit: type=1804 audit(1674505069.473:54): pid=11728 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.0" name="/root/syzkaller-testdir2952664040/syzkaller.QIMGea/74/bus" dev="sda1" ino=13943 res=1 audit: type=1804 audit(1674505069.493:55): pid=11728 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.0" name="/root/syzkaller-testdir2952664040/syzkaller.QIMGea/74/bus" dev="sda1" ino=13943 res=1 audit: type=1804 audit(1674505070.173:56): pid=11798 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir319937861/syzkaller.YO2VGd/79/memory.events" dev="sda1" ino=14314 res=1 BTRFS error (device loop0): unsupported checksum algorithm 1 BTRFS error (device loop0): superblock checksum mismatch audit: type=1800 audit(1674505070.203:57): pid=11798 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="memory.events" dev="sda1" ino=14314 res=0 BTRFS error (device loop0): open_ctree failed audit: type=1804 audit(1674505071.323:58): pid=11826 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir319937861/syzkaller.YO2VGd/80/memory.events" dev="sda1" ino=14312 res=1 audit: type=1800 audit(1674505071.343:59): pid=11826 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="memory.events" dev="sda1" ino=14312 res=0